I Discovered A Catastrophic Problem With My Mercedes V12 Engine AFTER Almost Finishing EVERYTHING!

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This video started off as one of my " I finished EVERYTHING" videos until I found something. Something that may require me to take my twin-turbo Mercedes V12 engine all apart again and cost a lot of money. I'm not sure how this happened but, it's bad. This is a bit of a rollercoaster so, grab that popcorn and enjoy.
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It's been a long time coming but I finally quit my full-time job to become a full-time KZbinr! Here's is the story of building my channel from nothing all while I build my twin-turbo Mercedes Amg V12 Engine.
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[@LegitStreetCars]

What would you guys do? Install Raid for Free ✅ IOS: clik.cc/I7vCD ✅ ANDROID: clik.cc/PwFc4 ✅ PC: clik.cc/hJjP9 and get a special starter pack 💥Available only for the next 30 days!

[@CathodeRayNipplez]

What would I do? 1) Insure it 2) Torch it

[@pfoxhound]

Weld it on.

[@MrRandomusername84]

Definitely with you. Weld it where it is so to don't resent the hard work you have already done!

[@ron25-33]

Watching your V12 video part 4 now, I'm falling in love with E55AMG wheels at the back, it looks so good and clean I want to make it as art.

[@themitt]

Don't weld it on. Send it back get it done right

[@kerrylewis2581]

The ending was like a daytime soap opera. The audience feels bad and hopes everything turns out alright and then the episode ends. So until next time please join us on "As The Crank Turns". Will Alex get his heads repaired without hours of wasted labor? Will LegitStreetCars reach one million followers? Is Alex the victim of a jealous KZbin star? Stay tuned for upcoming incredible content and the conclusion of the V12. Love the suspense and your channel.

[@jonpeters1183]

“These are the days of our lives” @kerryLewis Either you watch too many soap operas or you’re a promo writer!

[@Boss_Scaggz]

Plot twist: This head was actually the evil identical twin.

[@croquels1]

@ the same bat-angle, and the same bat-torque meter!! (1,969 ref, probbly you wouldnt understand 😆 ;-) )

[@croquels1]

The narrator was William Dozier / Walter Winchell. Btw.

[@jayammons3834]

As the crank turns is the kind of drama I need!

[@TheCarCareNut]

Bummer on the cylinder head! Look at the bright side that would’ve been a much bigger problem if you didn’t catch it. Keep up the good work!

[@LegitStreetCars]

Thanks!!

[@mclarenjohnf1]

@@LegitStreetCars bloody good catch, Many would have missed it. I don't think it was done in your garage that looks like a possible fault in the cast and they have just caught the tip of it.

[@ws6nightmare]

@@mclarenjohnf1 %100 this. Also, as a former career machinist, I'll absolutely promise you it left the shop that way, they just missed it. As the tool worked its way around that port, it just left a burr inside the void, normal for machining.

[@charleshaynes815]

There is a near zero chance that the hole is your fault

[@aspenyukon6845]

Pressurize the coolant passage with water see if it leaks out the pin hole

[@gingafuzz1]

I’m not convinced it’s a breakthrough hole into the coolant jacket. It looks more like a casting flaw which the machining has broken into. The machine shop ought to have noticed it on final inspection though.

[@joshuaowens4797]

Exactly!

[@peterharms3639]

Thought it had been x-rayed?

[@AMS8040]

Yep. First thing I thought...casting.

[@geek49203]

Adding my voice to a flaw in the casting. Some firm putty solution should do it, unless it's load bearing or thru to the coolant, etc.

[@vincentrolfe1384]

Back in the late 60's (who is that old) I had two Mercedes cars and spent time in St. Louis buying parts. Once I saw a 6 cylinder aluminum manifold in the trash can outside the dealer and it had the same style crack as seen on your video. A small TIG torch can get in there and weld that and case done. Inspection of the head at the porting house would have revealed the faulty casting early on. We live and learn. What is the chance of getting a bad casting and then revealing a crack when porting. We used to cast aluminum in 8th grade shop class and some of the castings had faults. Glad to know you spotted the problem and the porting company is atleast offering to fix it. Keep smiling. I have worked for 15 companies in my career and every time we had to send out for work there is always the chance of fault so inspection is the final step in any process. Leave nothing to luck. The best craftsman always wins.

[@TwoOreosOneCup]

Damn you can just see the sadness in his eyes at the end of the video. Almost holding back tears. I really hope everything gets fixed and works out in the end. Keep pushing and we will keep watching.

[@roberthatley7415]

Alex man, congratulations on taking that leap of faith and making this your full time job. You’re such an honest, wholesome and hardworking man. I seriously believe there’s nothing you can’t do. I hope I get the chance to at least shake your hand one day. If you ever find yourself on Oahu in Hawaii please let me buy you that beer.

[@MaleficGP]

I 2nd that if you come to Miami, FL.

[@MDC_1985]

It was the port job...but it wasn't their fault. I create machining processes for the CNCs the machine heads (and blocks and other castings) for the OEMs. "Porosity" is the number 1 issue that causes parts to be scrapped during the manufacturing process. Porosity referes to voids in the metal that can form during the casting process, essentially trapped bubbles that expand when the metal shrinks during the cooling phase. Ideally these would all be identified at the foundry but oftentimes they won't show up during the machining process and are caught during automated leak testing. That void was certainly there before the head was ported but it was below the surface and the port job just exposed it. Not their fault, but if they 3D scanned the parts after machining, it should have picked it up. TIG it and you should be good to go.

[@narcissistinjurygiver2932]

all they had to o was a visual inspection

[@NoGGy]

Oooooooooo aren't you cool!!! Lol na just joking. That is pretty cool.

[@nortbort]

This is exactly what happened. No way something hit that, I wouldn't deal with the people who did the port job again.

[@nicksporich6435]

I agree. You can see the pit when he shows it off after getting it back from the CNC guys a few videos back kzbin.info/www/bejne/pIbUk3aEoLuWgaM

[@samrodian919]

MDC1985, Sir you talk a great deal of sense.

[@EmObReNdAnJaCkAsS]

Alex, as a Tig welder here in Australia you need to find a welder that has the appropriate small Tig torch to get into the ports. I would advise finding someone that has a WP24 size torch as it will allow optimum torch angle to create the best weld repair.

[@petercantremember253]

see Alex l told you in Australia your viewing had doubled this confirms both Andrew and myself always watch your awe inspiring videos..shame about that inlet port , l think the cursing section was edited, hope it's not too much of a pain to repair..And hello from Melbourne Andrew..

[@shedtime_au]

Yeah up here in Bundarra NSW we love Alex too. :-)

[@godbluffvdgg]

@Stupid Liberals Better to braze it and polish it...At least that will last...

[@picks2789]

Love Alex, from NZ 🇳🇿

[@mycosys]

been watching since before 20k subs, hi from Lake Mac

[@lamboferruccio]

We’ve all been there brother, will actually make great content showing us how to repair it, it’s not like you have a customer breathing down your neck for the car so it’s a win.

[@vsar1938]

"It didn't leave that way." Lmao that would never happen during shipping.

[@arcadeuk]

Yeah, it must of happened in shipping, you know, the postman must of accidentally opened the box and accidentally stabbed a sharp tool through the metal 🤦‍♂️ Oh and they only did it on a part INSIDE the head 🤣

[@yungtooli]

@@arcadeuk or the box fell onto a sharp object which punctured a perfect pinhole into the INSIDE of the port. definitely not the shops fault

[@Spacecadet3890]

They probably sponsered the porting it looks really bad on them, especially after they mapped the heads and made a cnc program to do other heads. This is why i stopped watching itsjusta6 because he took a bunch of bad but free parts shilled them out to his viewers only to have them break on him. He literally told his viewers the product was awsome go buy it then had issues with it. Shill your merch, shill dumb shit like raid that i can skip. Don't tell me what parts to buy then have them break.

[@ChrisCaramia]

Right. Shipping damage is never that precise. Gasket surfaces dinged up? Absolutely. A pinhole in an intake runner? Casting flaw or deliberate drilling to verify thickness. "It didn't leave that way" is absolutely "We didn't notice it either". Good on them for offering to fix it though.

[@jmblur]

This looks like possible casting porosity. It's possible that it was incredibly thin after machining but somehow didn't break through, and just normal handling removed the small amount of material bridging the gap.

[@AcuraAddicted]

Being a father that you never had is gotta be one of the best highlight of your life. Way to go, Alex!

[@busterscrugs]

When Alex went "are you kidding me?" I felt that. Worst feeling ever when you're working on a car.

[@justinlangley9522]

and the best thing about that was it was in real time! no scripts , no cuts in the video, just Alex legit finding an issue with the engine!

[@arbenowner]

That can be welded and hand finished without having to pull the head. Sometimes cast are not perfect and it could’ve been a super thin in that spot.

[@joshuaowens4797]

Exactly... or just a small defect buried in that area.

[@troyfankell6581]

That was my thought as well. I know it is AMG but it is still a production head. It can still have casting defects and unless the cnc shop did sonic or x-ray testing (both processes are expensive and time consuming), then they wouldn't have seen the thin wall in that area.

[@graze105]

That looks like porosity in the casting that the porting exposed. This is almost certainly not the fault of the shop that did the porting or any sort of damage from shipping or anything being dropped on it, at least from what I could see in the video.

[@ralphmenta249]

Yep, I totally agree. it probably backfilled itself or had a burr covering it and looked smooth when it left the shop, but as soon as Alex blasted it with acetone or brakleen, it reared its ugly head. It looks pitted

[@makpsv]

My thought exactly.

[@Fullion-CA]

As a machinist, that pinhole looks like a casting imperfection. Might have had a thin film of aluminum over it until compressed air was blown over it.

[@InfiniteBumblebee337]

Exactly, aluminum can have porous spots that will ooze coolant. This was probably one of those spots that flaked off.

[@knightonwarbeck1969]

Agreed.

[@module79l28]

Good catch! I'm not an expert but as soon as I saw how the hole looked and its location I immediately thought of that. It would be virtually impossible for anything to fall into that port and do that kind of damage.

[@Hydrazine1000]

Metallurgist/materials scientist & engineer here, came to the same conclusion (theory/assumption) as you did! This was most likely a sub-surface casting defect that was exposed by the porting. A jolt or compressed air would have dislodged the loose bit of metal covering the defect.

[@actschp1]

@@Hydrazine1000 Though I am only an aspiring engineer, the same thought occurred to me. I am betting their 3D scans look normal, and it was dislodged due "mechanical agitation" during shipping.

[@cubbysrig]

I could see it in your eyes, hear it in your voice, that you just wanted to cry. I know I did. But, like you said, it’s a good thing you caught it when you did. A learning experience, to be sure, and at the very least. Sometimes we get caught up in the excitement of the project, and things like that happen. Like a good Marine, improvise, adapt, and overcome.

[@charvakkarpe]

He always looks like he's going to cry, he just needs eye drops to stop the incessant blinking.

[@justinlangley9522]

im pretty sure most people would not of even found that issue! they would've just chucked the intake manifold back on and call it a day! but because Alex is so METHODICAL at this work he picked it up , dude was clearly shooken up from that !

[@Iyellatbabies]

First 39 minutes: *happiest man in the world* Last 5 minutes: *YT apology mood*

[@joelwhicker4661]

Likely porosity in the casting that was exposed during machining of the surface.

[@rybreadification]

Ya, that’s what I thought, probably why they “x-ray”

[@swiftarrow9]

Came here to say this. That is typical of cast parts: small voids. Since the void wasn’t enough to cause a problem it passed MB’s QC. But obviously it was enough to give you grief. Welding it should fix.

[@russellhepton41]

@@rybreadification has

[@raff96]

If you check your older video ( Building A Big Power Twin-Turbo etc etc ) at 2:08 you can clearly see that the inlet was already damaged

[@lukasmezic2293]

Yeah I just looked and it was def always there. Good catch

[@victorsinclair188]

Just had a look too, you’re correct. Good sleuthing. Can you check the video where he took them off to see what it looks like at that point. Give us a time code if you see anything. Doubt it, since they should have seen that if it came to the shop with that damage.

[@TheQuestionableGarage]

We talked on the phone, but it’s a ‘easy’ repair. It can be discouraging to hit road blocks, but it’s a opportunity to learn new skills! Silly putty and wet rag are your friends.

[@matthewcoggins7288]

It worked for me when I got a big trigger happy with my diegrinder!

[@Slider68]

JB weld and similar will work for several years but in my experience, (even if prepped very well and even if you roughen up the surfaces) it ALWAYS eventually lifts around the perimeter and eventually pops out. It might take 5, 10 or more years but if you want the motor to last you are much better off to just weld it right off the bat and never have too worry about it again.

[@BoqnskiqMaistor]

@@Slider68 I've seen such issues being "handled" with jb weld on a CLK. Yes - it was a 4-cylinder, kompressor, yes, not a performance car like this one, but after 10+years owning that vehicle, i noticed it after i decided to part out the car and it never failed on me...

[@theappliancereview]

@Jared…I think you should consider making a trip out to Chi-Town to give Alex a hand. I think fans of both channels would be stoked to see you two collaborate. I’m sure there’d be some cross pollination of subscribers too! @Alex Speaking of cross-pollination… From a marketing standpoint, shouldn’t you be tagging this series as the “CarTrek” Mercedes V12? It’s been so long a bunch of us have probably forgotten about the origins of the engine and the car. 😉

[@Slider68]

@@BoqnskiqMaistor I've successfully used JB weld many times. I have a shelf with 3 different types of it in my garage right now. In one of the longer (and earlier) uses I fixed the rotary valve outer housing on my 1978 Skidoo RV340. After about 10 years of light use the JB weld started to turn a different yellowish color and the edges started to lift. At about 14 years it popped off, leaving the engine lean and seizing it up. It's great stuff for race car repairs, for vehicles you don't expect to last more than 10 years, and for none critical repairs (like oil pans) where you can access it and re-repair it again. I personally wouldn't use it on a hard to access area on a potential future collectors car that I expect will be in use for decades. It would work but why not weld it and be done with it forever.

[@bigsteppa298]

“I asked the guys and they said they didn’t do it” Wow shocker

[@joemeatball1080]

Who wants to be on the hook for one of those bad boys?

[@2006gtobob]

Nobody ever does anything when questioned! "It was like that when I got here." "It's always been like that" "must've been damaged in shipping" among the many excuses.

[@chemxfan]

Shops NEVER do it - that's the code. Even when they do it.

[@racerboy2212]

Alex, without question, you are one of the best MB mechanics I’ve ever seen. Your knowledge, transparency and energy are unchallenged. Best channel out there! Thank you for giving the world a peek into you!!

[@joseolmo6987]

Agre 💯

[@Moist_Handshakes]

That pit in the port looks like a casting flaw that was exposed by the porting.

[@Frank_999Scoobydooby]

looks like a casting void that was exposed when they ground it

[@zollotech]

Wow, that stinks…hope to see how they repair it and can’t wait to see it finished.

[@moloono1]

Hey Aaron! Good to see you in a video on a different channel!

[@joaomiiguelcosta]

Amazing comment! Definitely didn’t expect to read this! Two great content creators! Keep it up boys

[@georgeanddaddecker7563]

Its also possible when porting they hit a casting porosity. That kind of situation is common.

[@rx7racerca]

That was my immediate thought too.

[@daveburgess7684]

I’ve been a machinist for 20 years and that looks like porosity to me. Usually when we have porosity in a part we scrap it, but we work on a lot of aerospace parts.

[@speedtrapp219d2]

I’m in NW IN about an hrs so from ya if you have issues finding someone I’m a union pipefitter welder I can totally tig that up for ya and I have the porting tool too

[@LegitStreetCars]

Can you email me at [e-mail]

[@gregrn779]

@@LegitStreetCars so awesome if you got a guy from the comments section to TIG it up for you and had him in the video!!! Talk about integrating viewer participation!

[@jonathanmiller2351]

Sorry about your cylinder. That's a huge bummer. Good on you for handling it with such grace and humility. The world needs more of that.

[@AMGEVAN]

Damn, what a way to start a full time KZbin career. That must be frustrating. My prayers go out to you brother. There is always sunshine after the storm!!!

[@srconcepts1848]

I know that feeling of gut-wrenching disappointment Alex, these things happen especially with highly modified parts. The saving grace is that you caught it now, not 2 weeks after getting everything back together and wondering where the smoke/coolant loss is coming from. It's also a lucky thing that it's not an invisible tiny crack as it very well could have been. You know what needs to be done, so all there is left is to do it... we have complete confidence in you!

[@kennybuckman6483]

If the hole is rough and jagged, it's porosity. An air bubble from when it was cast new. It showed up once it was ported. The porting company lied in the respect that it wasn't that way when it left there shop, but they didn't do it. My experience comes from the fact that I work for one of the largest die casting companies in the world. I have seen these things on a daily bases for almost 20 years. It can be welded up.

[@gregh7457]

agree with you. i had a 40 year old nissan head start leaking coolant from a very strange place. the machine shop said it was a void in the aluminum when cast. i guess i went one too many heat cycles with it and it popped open

[@nicholaslamber7599]

I was going to add the same thing. That looks extremely similar to porosity that is seen during cylinder head casting. In some cases it is under the surface and only exposed after machining like what happened here. After spending a few years working in cylinder head casting you definitely see this kind of thing

[@Levan4KGaming]

37:51 *And the Golden Raspberry Award goes to Alex Palmeri* 🤣🤣🤣🤣🤣

[@stevetreadaway3254]

I wanted to be a mechanic, but my high school did away with auto shop the year I got there. Thanks to you I (at 67) can still be a mechanic without greasy hands. I'm enjoying all your videos.

[@FranciscoLopez-qj6nj]

Good to see you teaching the little one, wish I had someone teach me things like that growing up. My dad’s in my life but he knows jack about cars😂

[@Sannerr]

my dad ain’t even in my life i wish i had someone to teach me a bout car. i work in a mechanic shop rn and i’m learning a good bit

[@garygrenier]

This is a great video because this is exactly what can happen when you’re Working on cars. The only way to be successful working on cars is to have a lot of patience and realize that the parts and tools and bits and pieces are going to do what they want to do not what you want them to do. Great job keeping your calm and showing people how things should be done

[@littlepippin8445]

@@Sannerr same. My father left home when I was 12 - decided he would rather spend more time with his office secretary than me and my brother and mum. I'm 58 now, and teaching myself how to fix my '72 beetle. Just like that 12 year old had to fix his own bycycle....

[@Sannerr]

@@littlepippin8445 respect brother ✊🏽

[@robnarley]

I got that sinking feeling when you showed the problem, and it’s not even my car!

[@danielmurphy9140]

This is actually an outstanding situation. We are all learning and what can we learn if everything is perfect? Now we have an issue that is common and will watch as you work through it. Take a deep breath and drive on.

[@viggendriver1975]

Wow, after all that effort. Thanks for being a great role model and teacher!

[@zREDDINGTONz]

I get so excited when you upload, almost feels like power block when I was little.

[@LegitStreetCars]

That's awesome. A big reason I started the channel was because I grew up watching those shows

[@zREDDINGTONz]

@@LegitStreetCars Do you have merch yet?

[@autotalon]

I'd just jb weld that, but there's probably a reason I'm not a Mercedes technician, lol.

[@jamjamthejamman]

My first thought too. Also probably why I don't work on cars

[@Mrb00st]

Hahaha same a dab of jb weld and some sandpaper

[@theephemeralglade1935]

I mean, come on! It's an intake runner. Emery cloth and some JB Weld, Godamnit! Why bring a TIG welder into this?! You have Mercedes parts strewn around your garage floor, lol.

[@bc8683]

First thing I said was “shiiidd, where’s my JB Weld” 😂😂😂😂

[@Flies2FLL]

That was my thought too. But I would find a way to pressurize the cooling system with air and see if it actually leaks. I bet it wouldn't, so JB Weld would work just fine.

[@scotthastings5794]

I am a year late, but I am impressed that you just went quiet when you found the hole and didn't need to edit out or do a quick cut scene for colorful language after putting so much work in. Love your channel and just going through some old videos.

[@thevindictive6145]

I know how he feels, i did a small job just changing my rear drums and got all wrong parts for the job. I am a small time DIY guy so it took me hours to do it. Got it done but the drum wont fit back, had to take everything out and put back the original. Had tons of cuts on both my hands, exhausted as everything was done by hand, no power tools. Spent a whole day got nothing done in the end. This is a whole V12 engine redone, its monumental frustration. I cant imagine. What hurts you makes you stronger bro, keep at it. Love your videos.

[@ianskinner1619]

from the look of it, a good TIG welder should be in and out in an hour

[@skmetal7]

or even braze it.

[@ramlange]

I hope so! This comment was what I was hoping to find! Fingers crossed!

[@ianskinner1619]

@@ramlange a lot of people on here being very cavalier about the repair, but JB weld or even brazing does not become part of the matrix, just a patch and not knowing what alloy it is, you have no idea if that mechanical bond will hold or pop. Welding, someone mentioned a laser or cold welder, with some high gauge filler ( 3/32) would be perfect. hell, the price of a cold welder off Alibaba he could buy one and pretty much get any competent welder to do the job and have a good light gauge welder for the shop

[@philipparana9225]

That port job looks way too aggressive

[@MatthieuAmherst]

Yup and then a pressure test

[@anabelbarajas]

V12 CONTENT!!!!!! Let’s go!!!!!!!!!!! Haven’t seen the video yet but I know it’s going to be great.

[@jeffreyo4866]

V12 CONTENT!!!! LET'S GO THAT IS THE MOST ATTRACTIVE THING I'VE EVER HEARD FROM A WOMAN🧐

[@GanjaNinja]

"Haven’t seen the video yet but I know it’s going to be great." Yeah the heads cracked

[@anabelbarajas]

@@GanjaNinja I know. It’s a bummer

[@Willay323]

For those playing at home, never ever should you start a bolt or nut using power tools, always start threads by hand for the first few turns then use power tools. Will save you a lot of headache for that one time it goes terribly wrong. My toes curled watching him do those cam gears

[@RB-rv3yc]

GREAT ADVICE!!!! I learned that one when I was 8 and fixing my bike and instead of hand starting a bolt I used a socket.

[@Slider68]

The newer, decent quality impact wrenches (most electric ones I've used) produce no more than light finger torque levels of torque when you lightly pull on the trigger. If cross threaded it will just stop - unless you really squeeze the trigger. I totally agree with you for anyone using an old impact wrench and even if you have a new one you do need to be careful when squeezing the trigger initially.

[@okgo8315]

ALWAYS START BY HAND.

[@miscbits6399]

I was always taught to spin them backwards by hand until they click into place. This is doubly important on plastics and self tappers because you DON'T want them cutting a new thread

[@bilaltariq7819]

You can learn to start with the gun with practice

[@strife3084]

I'm an Aerospace certified welder. I've welded many a automotive parts in my time. the only issue you have is this. DONT WELD ASSEMBLED! you have a seal two inches away from that area and it WILL MELT. other then that, easy job. if your in the PHX AZ area id do it for you

[@indetailcarcaresolutions3770]

Hi Alex. Such a demoralising development with the damage to the port. You must have been gutted when you found it and you hid that pretty well in your conclusion. Good luck in getting it repaired. As I teach high school engineering here in Sydney Australia, I look forward to sharing this video with my senior class as they need to understand all forms of welding in practical everyday engineering situations. Lloyd

[@lwclark]

All the Sloppy Mechanics viewers are saying "dude, JB Weld and send it"

[@williamwade7059]

That's MR. SLOPPY to you.

[@actschp1]

I knew a guy who JB Welded a water jacket adjacent to an exhaust port. He drilled out the hole, squeezed in a titanium rivet, and then used the highest temp jb weld he could find on the water side of the jacket. Never had a leak. I never would have done it that way, but dude was old school and just didn't have the patience for something "he could fix his own damned self."

[@ericmaddon7621]

@@williamwade7059 Exactly what I was thinking!

[@TheCoolDave]

@@actschp1 My Webber grill, I cracked the lower part(trying to get out a rusty bolt) and it's $300 part for a grill that I paid $200 for (good deal on a used grill), Well, High heat JB weld, 2 years later, no problems at all. It does work in some cases but, would never do that to a car.

[@rvhmon656]

Looks like a job of MR. DEV CON, but since it's a V12 Mercededes perhaps a tig weld is more appropriate. Temperature stable solution.

[@KittenMcSnugglet]

I love that you include the good, the bad, and the ugly in your videos. Thanks for being real!

[@windronner1]

Don’t kid yourself Alex. It’s your perseverance and work ethic that has built this channel. Just as much as the successful easy builds. overcoming these setbacks is what’s making everyone realize how good 👍 you are. Stick with it buddy. And so will all your viewers.

[@connectedautola4191]

“How’s that timing chain?” “Bad” That was way funnier to me then it should’ve been 😂

[@semirselmani9139]

I worked as a Mechanik too, and everytime this „No noo nooo noo no nooooo“ is coming you want to cry or burn it all down. Greeting from germany and an Certified Car Mechanik too at Audi and Volkswagen.

[@roadwarrior144]

I am a DRIVE certified Mercedes-Benz technician, and I can attest to the accuracy of this comment!

[@croquels1]

I also had "that" moment before... while watching the video I got stiff in my chair!!!

[@semirselmani9139]

@@croquels1 I hope we never get to this moment again

[@PointerPapa]

Alex, I love that fact that you talk us through the process and don't just time-lapse everything.

[@stantheman5163]

All of us who share your OCD in putting engines together with such care and thoroughness truly felt your pain. I am sure all of us had similar disastrous experiences in our rebuilds as well. I don't think the shop damaged that cylinder and let it out the door like that. It is too obvious and horrible for their reputation. I have made the vow many times to thoroughly check things like that but in the excitement of getting the project done, it gets forgotten. You handled it quite well and showed your mettle. I look forward to seeing how it all turns out.

[@leonardopena9522]

You’re such an inspiration for me, I work with my dad here in Venezuela he used to work in Mercedes Benz before they left the country and we work with Mercedes only, last week we did an M119 changing some components, greeting bro 💜

[@rogerwhittemore9950]

Fortunate that your " mechanic's OCD" had you inspecting so thoroughly. The repair will make some good content. Looking forward to the next chapter.

[@jtaheri223]

Also turned a mountain into a mole hill finding that pinhole before full assembly and start up

[@bmwm6cabrio06]

Man, I almost cried at the last part.. what a bummer, but I totally agree Alex, the real catastrophic problem would be you starting that engine with a full pressurized cooling system. Jeez, I don't even wanna think about that scenario. Keep your head up, and whatever you decide to do, it's gonna work! Absolutely loved the long episode, and absolutely loving this build. The facelift CL65 AMG happens to be my favourite car EVER!

[@samrodian919]

What a bummer. Just be glad you caught it in time mate!

[@DeusVolo]

I think Alex has more German in him than Italian because he's so comfortable around these engines. You make it look so easy!

[@turk71385]

He's definitely got that German torque down. Gutentight! Yes, I'm a mechanic. Yes, I've heard that one way too much.

[@mattnowlin6626]

This engine is practically brand new now. & It's so impressive.

[@Fwerks.1592]

Keep your head up Alex! Good thing you caught the issue before installing the engine. Take your time, it will be worth it at the end!

[@user-oe5jl6dr3p]

Wow, what a bummer, I could see it on your face when you discovered it. My stomach just dropped when you found the defect. I used to do work on various engines when I was much younger, so I know that feeling. You have a great attitude, but, nothing ever goes smoothly, even when you are on the last leg and you can see the finish line. You are awesome and would make a great teacher. Thank you for sharing your work through these great videos.

[@Thecarguy1254]

Nothing as depressing as finding something like that right in the final stretch. Definitely best it was found during assembly though! Could've been so much worse

[@benparkin3937]

Call Jared from wrench every day. His McLaren welding job was inspiring.

[@markbeiser]

But did you see his recent welding job for his Lexus motor mount? 🤣

[@BlagoP]

@Ben Parkin Jared from wrench every day? LOL Guy is not a professional welder. This is a job for a professional.

[@originalmianos]

@@markbeiser I believe this comment is irony. 😀

[@turk71385]

@@markbeiser No, but I did see Freddie's recent welding job on those motor mounts. Still better than I could have done at this point.

[@charrtv8717]

@@BlagoP The different between a professional and an amatuer is, a professional gets paid for his job. There is a lot of amatuer who do a far better job. I was a licenced welder 40 years

[@leonardnose5695]

Alex I love your content and admire all the knowledge you have. I wish you nothing but the best on your new garage. You are one in a million in how honest and hard working you are. Wish there was more people like you. ✌🏼

[@uga.d4173]

I respect your attitude and response to adversity every bit as much as I respect your skills as a mechanic.

[@javiermjr1]

First LSC video I LLC watch uninterrupted start to finish. Let’s go Alex!

[@LegitStreetCars]

Thanks brother!

[@MK-zm8vl]

Good catch. Your composure through adversity is as inspiring as your mechanical expertise and ability to share that with others. Can't wait for the next episode!

[@jamesniess2485]

It is so nice to have a set of small hands around 👍👍👍👍👍and to get tools🛠🛠👍

[@vernonion5402]

Spit happens. You rock! Thank you for the link to the Shop Manual supplier. You saved me both money and time. Best of luck with the rest of the assembly.

[@user-tz3zn2kz8w]

When you said "You really can't mess this up" I also heard the words [Clarkson] "How hard can it be?" [/Clarkson].

[@poot111111]

underrated comment!

[@autoavids]

I recently bought my first AMG. Driving it home instead of listening to the radio, LSC on playlist felt appropriate. Love the "older" Benz content 👍

[@robertmarx4857]

me too man!

[@ralph4840]

As an owner of multiple Mercedes-Benz cars I must say it is a pleasure to watch you working on this engine.

[@rogerchiu2210]

So sorry Alex… so much work had been put into this. I applaud you showing your emotion and exhaustion, cuz any average handy guy know that’s how real life works. Sometimes they don’t always work out.

[@johnlincoln4616]

Awe man I’m gutted for you Alex, I know how much time you’ve got into this engine. Kudos for seeing the bright side, you’re setting such a great example for everyone especially your kids who’ve watched dad work so hard on this. Still can’t wait for it to be finished, keep up the great work!

[@daveh2612]

You should get a new AMG engine plate with your own signature on it.

[@roadwarrior144]

Yes! Im sure there is a fan of this channel who is a machinist who can fab one up in a hot sec!

[@goosedeathable]

He’s earned it I think.

[@bmw540i]

Bummer, but great job on spotting in time!! We'll happily wait. 👍🏻🇬🇧

[@chrisjamesbehan]

I would be really great to see a video on tig welding in situ - the quality of your content warrants it. I bet you'd pick up a bunch more followers that searched 'welding rescue without fully dismantling engine'. Keep going buddy. A lot of us V12 owners are counting on you!

[@robbygagnon]

"Okay so both of our sprockets are o..ahhhhhh" 😂🤣 story of my life.

[@Ecozzy0123]

“ a little zip zip and a little torque torque” 😂 great video man

[@paularietta6744]

Love that you are teaching your children how to work on cars. So cool!

[@boxerdog5979]

Glad you caught this in time. Watching all your videos all the way through and liking before I even watch to support all your hard work.

[@rizwanshaikh1177]

God showed you that pin hole before starting the engine. Its an easy fix you can do it easily sir. Great job done

[@OMGWTFLOLSMH]

But why did god let the pinhole occur?

[@MJPilote]

There is no god, its just you thinking there is so you would have someone to blame for all the misery and chaos. Its just people, and too many of them. Two of the most evil discovery of men, religion and money. Both have murdered more people than any illness or catastrophe ever. And you still believe there is god? What a sick entity it would be to allow all the suffering and agony of children being killed every minute of every day!

[@lebebop9931]

Wow this escalated.

[@yepyepyepyep1407]

I started working at a Mercedes dealership last year. I never want to touch a v12 but I’ll just watch this just in case

[@bruceaugustine6486]

2:42 on the pullies, what a slacker LOL.

[@jtheun]

Hey this is good. New extra content on a repair we wouldn't usually see. I don't watch to see it finished I watch to experience the journey. Your good work is much appreciated.

[@jefftepper1305]

Alex: Have you pressurized the coolant passage/pipe the feeds the water passage under the pinhole? Best of luck on this one. Regards, Jeff

[@alano2875]

That's the problem with castings. You never know what's inside (in this case just below the surface). Here are some random thoughts...I wonder if the folks that did the porting check for leakage? In other industries, when this amount of machining is done to a casting, a fluorescent penetrant inspection would be done). So, if it doesn't leak is a good to go? (I'd still want it welded). But...Kind of wonder if heat from welding will open up some other porosity nearby. Some really tough decisions on how to solve the problem. It's incredibly frustrating when something that could have been prevented by better quality (of the casting) or better inspection mucks up a job. One way or another it is probably fixable...but I would forever be suspicious of that head.

[@miscbits6399]

@@alano2875 you have to wonder if the port shop should upgrade to that poolicy in future....

[@nathanellis801]

Props to your editing guy! Did a great job. Loving this V12 series. Edit: Just got to the end of the video. That hole hurts man. Sorry it happened. Hope you can get it fixed easily and you get to drive her soon! Your efforts will not go unnoticed when she’s done!

[@adrianhinds9200]

I'm so glad you showed the mistakes, I struggle so much to remember where things go after disassembly

[@brettwilson9278]

Hey Alex look at your previous video when you got heads back it clearly shows the hole in your intake port.

[@dougsrosen]

"You really can't mess this up" Finally my specialty is required.

[@michaelathens953]

"you can't mess this up" The internet: "challenge accepted"

[@bmw540i]

Love it!! 👍🏻🇬🇧

[@paulbradbury7889]

Keep it up, great videos, great knowledge, extremely enjoyable, for an old aircraft engineer.

[@windycityben4850]

That’s a major bummer man!!! At least you found it before start up!! Best of luck to you man! Look forward to seeing the fix for it.

[@dubsydubs5234]

The extension doesn't affect torque when using a torque wrench they only affect torque with power tools.

[@bgee461]

It does if you don't keep it perpendicular to the head of the bolt. The force vector gets split up as the angle of the socket deviates from the plane of the bolt flange

[@indymatharu4438]

Great content!

[@coyroy4339]

Wow, good luck! ‘Looking forward to the progress and next video.

[@miquerto]

Cool video. Glad you found that hole. Hope it's not too much of deal to fix. Thank you.

[@Lumilicious]

Unc Rich knows someone who read a book about welding. Dunno how far away he is from you, though.

[@BetterCallGatto]

Can relate. Give him a Book and a welder. And Just Wait for. It

[@STimedic1]

That's literally a 5 second weld job, will take longer to sand down.

[@johnhufnagel]

silly putty in the runners to keep the junk from getting in there. mask everything else off with tape and paper, then sacrifice more silly putty or a tack cloth to the job of cleaning up before you unmask.

[@Rollin8.0]

Not really even worth welding IMHO, they use epoxy to shape cylinder heads that get ported into the water jacket (used to be common to do it on purpose back in the day) I reckon epoxy fix would be fine.

[@robertthomas7176]

@@Rollin8.0 .

[@user-pi5nx8go8f]

Alex you're such an agreeable guy, by the way you react to bad news you can see that you're just a genuinely nice person.