We Wish We Would've Caught This Sooner...

[@johnelliott7375]

I'm glad to see that there is a honest company still.

[@sonyhk3824]

Agree 👍

[@tracewallace23]

In my limited experience, small companies that have been in business for a while, tend to be much more honest than ANY big corporations 🤷‍♂️

[@noahingram8052]

Ok

[@51-FS]

Yeah theirs a transmission shop in Texas that's the same way.... I would love for these guys to build me a motor and the Texas guys build me a transmission.....

[@noahingram8052]

@@MikeRatcliffe24 haha ok

[@tricycleguy2657]

"New bare casting" "ready to assemble" I like the thorough check of the new head they are never right on

[@JAMSIONLINE]

We check every new casting! Never know what you're gonna get.

[@tricycleguy2657]

@Jim's Automotive Machine Shop, Inc. you aint kidding even brand new heads from cat get a straight edge check

[@ctdieselnut]

Do you guys get many 6.0 ford diesel heads come through the shop? Or did you in the past? They were kind of notorious for the head bolts stretching/heads warping/cracking (which lead to head gasket problems) . 6.0's are starting to get kind of old now, but there are still plenty of them on the road, was just wondering.

[@Sunspot-19]

QC was smoking too much pot, Jim and Nick had to redo their shoddy work!

[@kruyf73]

I'm not a machinist or (car) mechanic. Just a electrician. But i really enjoy watching your video's. The skill involved doing the things you guy's do is really great to see. Greetings from the Netherlands

[@matthewb8229]

"Just an electrician" he says! A cousin of mine was electrician, and the problem solving skills he had when it came to figuring out a scheme for the multitude of jobs he did was amazing. As a telephone/comm network installer, I've done the same kind of thing. None of us are "just".

[@Z-Bart]

Never sell yourself short. You are a skilled tradesman. There will always be a need for the trades. Signing off, Plumber Ray.

[@JAMSIONLINE]

Thank you for taking the time to watch!

[@harrywalker968]

@@JAMSIONLINE send it to india,,they,ll fix it.. watch there vids.. amazing..big diesel re builds..

[@ctdieselnut]

@@harrywalker968 was just watching a vid from india/Pakistan of them casting a huge involute gear, like multiple feet thick. Those guys are impressive for making do with less, but it's kind of scary the lack of any saftey equipment (open sandals in a metal shop, plus the child labor).

[@ronbunker5778]

It's impressive that you check the heads to spec even though the manufacturer stated they were in spec. Thats an extra step you take to give you the confidence that the parts you give to customers are the best than can be. Really nice work!

[@bcbloc02]

They can print anything on a tag. If you don't want comebacks you better check EVERYTHING especially these days. Just the other day I had a set of new pistons come in for a job that 2 of the 6 were .005" oversized past the limit. While they physically would fit in the bores it would have seized as it was warming up and failed the engine.

[@hiteshadhikari]

@@bcbloc02 always amazing as to how for close tolerance parts, the manufacturers charge so much yet never seem to be anywhere near desired tolerance limits

[@davidjones8680]

You never do know whats behind the door until you open it up and have a good look. I was more surprised by the machining requirements on a new head. How many brand new vehicles out there are sold with an engine that could have been made to better tollarance. Keep up the great work guy's. David in the UK.

[@andoletube]

"How many brand new vehicles out there are sold with an engine that could have been made to better tollarance?" All of them!

[@JAMSIONLINE]

Yep! I'm sure 99% of new vehicles are "good enough", but that's one of my least favorite phrases haha

[@bingusmctingus4395]

Cummins has a brand new manufacturing tolerance for all new engines and components, at .014", which is MASSIVE

[@UFO-047]

@@bingusmctingus4395 which tolerance in particular is .014"? Lots of different clearances in an engine

[@damianboyd]

These guys are the definition of do you want this done right or right now. Their knowledge and attention to detail is well worth the costs to get your part is done “right”.

[@SockyNoob]

Spend more now, cry less later.

[@logancarter2134]

I admire and respect the that y'all don't settle for " good enough" and always go the extra time and effort to make things "as good as they possibly can be." Great content, keep up the good work!

[@philr3510]

I work in healthcare, so I don’t know much at all about machining, but I really enjoy watching your videos! Very informative and educational!

[@MikhailScottKy]

I rarely do the work you guys do but I can honestly say that next time I do this work I will have new knowledge to use so my motor assembly will be even better than before.

[@TheFlanman10]

Those cracks are SUPER common on 3406E and Acert series. Seems the firing deck expands a bunch. The deck is very thick and if it passes a leak check we were instructed by CAT to never worry about it. But I agree with your assessment to replace.

[@joshuabaker5712]

Was just about to say this. Almost every one I have seen has at least 1 cylinder with that crack.

[@bennyfactor]

You always seem to make these parts *better* than new, which is really cool. Also the noise of taking the vacuum tester of the head was a nice satisfying PWOP

[@JAMSIONLINE]

I agree lol

[@Choober65]

A TRUE Engineer ALWAYS will since factory are built to cost, with hand builds it's down to the skill and integrity of the Engineer.

[@samrodian919]

You two are the most professional of engine re-manufacturers out there. If I lived in the states and needed an engine rebuild I certainly would send it to the cleaning guy and his kid!

[@johnelliott7375]

You were small when you got me as a subscription holder. Glad to see you are doing well and growing. Great day today to you both and have a great day today.

[@JAMSIONLINE]

Thanks for sticking around!

[@johnelliott7375]

@@JAMSIONLINE I have been learning a ton of different things from watching the channel as much as I can. Quality content

[@johnelliott7375]

@@JAMSIONLINE P.S., always welcome.

[@Zvertnie]

To deliver high quality products, it’s the quality of service that overcomes quality in parts! 👏👏👏

[@EastBayFlipper]

I noticed the same thing in 6-92 Detroit engines where they would crack between the valves and trash the head We'd get well over a million miles between teardowns on 6-71's and less than 250k on 6-92's Really enjoy the videos and your cleaning guy is top notch 😉👍

[@thephilosopher13]

As long as his injection components and his piston clearances are good, that’s gonna run like a scalded dog. Good, quality machine work on an engine like that isn’t commonplace. Even though you’re really far away from me, I might be in touch for some work from you guys purely for the quality of work that you do. Plus it’d be cool to see my heads on KZbin lol

[@montymartin4493]

Yes they really are meticulous

[@phoenixrising4073]

Coming from a long line of machinists, it's nice to see manual machining done with care. Of course CNC has its place but there is no substitute for the art of machining something with analog tools.

[@gerchwingallant654]

I have been in this trade for seven years now post my apprenticeship. Watching your videos has inspired me. I look forward to being the owner of a machine shop. You and your Dad make an awesome team and the workmanship is top-notch.

[@pst3615]

I like your way of thinking, customer first, they expect nothing more than the best and you guys deliver. If everyone did as you do, the world would be a much better place.

[@notyou6950]

I really enjoy watching you apply your skills and experience in your craft. It's part of my job as a cnc tech to make the machines deliver precision to allow the machinists to produce the best quality aircraft engine parts on this planet. I will fly on any aircraft sporting our handy work dangling below the wings. You only have one reputation to live by and you are doing a good job at it.

[@thomaswarnecke3991]

We all get caught up by the crush of time! Being man enough to admit to it just proves that you live with your personal standards and aren’t afraid to correct yourself ratther then send out a poor product!!!! Proud to watch your vids!!!!😊

[@fyreantz2555]

I could watch you guys do this all day.

[@Roger-hp1yg]

Wouldn't you get bored lol

[@fyreantz2555]

@Roger-hp1yg ...well...maybe a slight exaggeration on my part...

[@Matt_Vanepps]

I would love to just hang out in the shop every now and then. So much knowledge there.

[@SockyNoob]

Quality service right there. They could've just sold the new head without cutting the valve holes but they didn't. Never see companies that honest anymore. Any business that does something like this is worth the little extra money.

[@eddiepatterson5025]

Congratulations on approaching 500k followers. I respect your honesty and that’s integrity.

[@jackfrost1031]

Your ability to admit a mistake (parts before inspection) so candidly makes me wish you were closer so I could do business with you!

[@johncholmes643]

Caterpillar heads crack between the intake valves. Cat spec is if it's not beyond the valve seats it's reusable. There is no coolant between the intakes seats, hence why they crack.

[@MitzvosGolem1]

Very common on 4 valve heads . Kinda concerning but if no coolant behind and seat pocket s stay tight it's allowed.

[@kerryminigringo]

I’m a hobby car builder from an electrical background but I really enjoy these videos. The time you take to explain what and why you do stuff is just fantastic and I love the honesty in why you guys do things. All the best from Ireland 🇮🇪

[@donharper7759]

I’m not a fan of using aftermarket parts on motor overhauls but you being a competent machine shop I can see saving some money.

[@earnestbass1232]

Worked at a machine shop in the late 80’s interesting to see how things have changed.

[@sungear]

I love learning from people that know what they're talking about. I've got enough machining experience to know when people are BS-ing. You, sir, know what you're doing.

[@JAMSIONLINE]

Haha, I hope you're right! :P

[@michaelprue9024]

Nice 👍 ! I’ve had to learn over the years to pay attention to detail, several times. So don’t feel bad, it happens to all of us from time to time. At least you caught before any real work began. I hate investing time and labor into a piece only to find it was scrap from jump street and should have been caught up front. But still, with the work you did do to a brand new aftermarket cylinder head, I’m sure your customer had very little to complain about.

[@flightforensics4523]

Excellent! Glad I was around this stuff when I was a kid!

[@ErikMarquez-h9k]

Would appreciate you relocating the shop to Central Texas as soon as possible......Would be happy to make you our sole source machine shop for all our machining work... Great work as always.... Now to go to our shop and weld out two seized and broken 6.7 injector hold-down bolts in a method much like your way of doing it.

[@RockChuck]

My dad would have plugged that old head, pressure tested it. God bless him he was an excellent Machinist.

[@royhi1809]

Done Right Everytime with Excellence is your motto. Love your videos.

[@genefogarty5395]

I might just have to bite the bullet and drive my stuff to you guys, I'm in awe that you take such measures to ensure the job is done right. Work like you all do is extremely hard to find nowadays and the extra expense would be worth it to me. I can't stand hearing the shop I use saying, "You're not building a space shuttle"

[@tommyd1155]

Glad you double checked their work. Makes for a good machine job.

[@markchapman2585]

Great video, guys so relaxing watching you guys do some machining. If I wasn't dumb I'd like to be a machinist. I'm dyslexic and have ADHD ADD all the fun stuff, lol. But I still like building engines. I wish I could tune an ECU through. Cheers from Canada 🍻

[@stephenalbright6961]

It's good to see people that take pride in their work

[@holmes1956O]

Wow you guys really do great work. Its near impossible to find anyone interested in doing the work to blueprint spec. Good job

[@beeman1885]

Not sure how this showed up on my feed, but loved the video. You all are masters of your craft.

[@leftyeh6495]

The future is now! But I still can't see it yet?

[@bad406camaro]

Where can I find the cylinder head spec sheets I see in your videos ? Having complete head information prior to performing a job is always a plus but as a "home machinist" not a shop I often do not have this critical information and have to search the internet for what often is found to be questionable information.

[@JAMSIONLINE]

The spec sheets we have come from AERA Prosis Pro. www.prosispro.com/

[@peterstgermain1454]

It’s great to see a good honest company. I enjoy watching your videos

[@tracydiller9378]

Great video guys really enjoy watching. Been in the Automotive field going on 35 years including the manufacturing side. watching your videos makes me feel right at home. Keep up the great videos guys, be Blessed.

[@briansmyla8696]

As the owner of one of these engines, I can tell you that those cracks between the valves are common on the C12, and generally don't cause any real problems. But I do understand that if you're going to stand behind your work, you'll want to reassemble it without the cracks. When I overhauled my engine, I installed a head that had a couple of cracks like that. 250000 miles later, I haven't seen any problems because of it.

[@BobSmith-mj7ik]

We all make mistakes. The thing is you corrected it by supplying the customer with a new head. Good job guys.

[@jenniferwhitewolf3784]

Such care and detail... nice to see QC maintained as first criteria.

[@warbirdwf]

It's great to see your channel approach 500k subscribers. You and your Dad do a great job. It really doesn't take that much more time to be anal and shoot for the best results you can achieve. Machine shops are dying off and closing all over the country. So, I hope your channel and your workmanship is helping your business stay very busy.

[@JAMSIONLINE]

Thank you! We are actually busier than we can handle, but that is a good problem to have!

[@tedmich]

Nicely done! Experts still make mistakes, they just recover quickly and gracefully.

[@jekciso]

I am just amazed as to how they divide an inch like it's in nanometer

[@rowycoracing]

Interesting stuff. Thanks for posting.

[@jimmattingly4234]

We all get cart before the horse at times great video thank you for your videos

[@jbcowherder6210]

Question: up until a year ago i worked for a car dealership as a master tech (finally retired...YAY!), we were always told to use valve lapping compound on new valves/heads and to hand lap in all new valvetrains before installing the new heads.....I am now wondering, is this because possibly the runout on the new heads seen here? what are your thoughts?

[@JAMSIONLINE]

Lapping valves is a pretty heavily debated topic, but at the MOST the only lapping that should ever be done IMO is with very fine grit (not what they sell at Autozone) and a very quick lap just to check the contact patch. No amount of valve lapping will correct an improperly cut valve seat. I think it's more of a situation of old habits die hard.

[@MrRustyjackson]

As someone who spent significant time in both worlds it's about time and money. Most mfgrs will have you swap valves, springs cam followers, etc into a new head. It would be rare for a dealership to have a valve grinder 9or someone with knowledge how to use it) and sending valves out to a machine shop would add multiple days to the repair. No tech wants a car torn down in their stall or a thousand engine parts laying around to get lost while waiting for valves to return from the shop. The valves are lapped simply to clean the face then visual inspected to see if they are reusable. With hardened seats lapping does nothing to enhance sealing. It's a throw back to the days of softer metals where you could enhance to seal by removing metal with lapping paste and lots of time.

[@JHruby]

Enjoy your videos. I've been burned by that old don't order parts until you know the whole situation rule as well. Difficult to resist trying to save the time.

[@airhead151v151]

Hey that ramp up technique is a thing Hass machines do to break chatter. They oscillate between two spindle speed and compensate for the depth of cut

[@JAMSIONLINE]

Yep! Soon we will be installing an upgrade on the Serdi which allows constant spindle variation around a nominal speed, which helps reduce the chatter. Just haven't gotten it ordered yet!

[@tiredoldmechanic1791]

That's why many places don't even consider rebuilding heads. So many are cracked and a new head can often be purchased for about the same as it costs to rebuild.

[@matthewnorris203]

Yeah, you’re almost at half a million, great job guys!

[@georgecurtis6463]

When we did valve jobs or whatever, the first thing done was to check for cracks. Was common enough for us to do this every single time.

[@pjagger69]

I want my engine to fail so I can send it to you guys. Fantastic work.

[@steinthms]

Nice video. Your valve seat runout measuring tool is the coolest bit of hardware that I have seen in quite awhile.

[@JAMSIONLINE]

Thanks! I agree, it's a cool tool. We get lots of fun specialty tools in this industry that aren't seen other places!

[@Antony_Jenner]

Put sandals and pajamas on, build a fire strip head and put head on the fire to preheat then oxyweld cracks in head machine back to tolerances jobs done! With Thanks Pakistani Motors

[@MrDizzyDewil]

That's what you call extra mile! Well done!

[@michaeljohn8842]

All I can say is you guys are artist at what you do

[@floreswoestenburg9367]

Nice result!!, greetings from Dronten, the Netherlands.

[@danielhildebrand6892]

Nearly half a million subs and still had time to chat in an email. Thanks! Hopefully found enough parts for my d Jimmy motor!

[@Look_What_I_Did]

How does subscriber count have fuck all to do with communications?

[@danielhildebrand6892]

@@Look_What_I_Did out of all the shops i follow here on YT, Nick has been the only one to respond to a personal email about the engine i am building. And they are one of the higher sub counts. As busy as they are creating and editing content and answering messages on here to answer and chat with a personal email.

[@Look_What_I_Did]

@@danielhildebrand6892 They are good on anything but a diesel. Which is weird... but it is what it is.

[@gonesideways6621]

As a retired 45 years Tool& Die Maker love process you guys go thru as I always told my apprentices learn the process so how are you regrinding your cutting tool using surface grinder or a specialized tool grinder?

[@bitrage.]

You guys do good work.... love the drive to improve..

[@robertpirtle3638]

Good job! Sorry you missed the cracks. But I say 100% . It’s better then a remanufactured out of the box head. So the customer got a way better product

[@miceinoz1181]

Love that Serdi!

[@jocker621021]

job well done 🎉, chapeau bas monsieur, 😊 , from the technical view you and your dad are master of art , so glad you put your knowledge and expertise to the world to see 😊🎉

[@HueToobBlows]

Just send it to the Pakistani Truck channel. They "fix" these types of faults all the time!!! And they guarantee the repair to last until they give it back to you.

[@alansvanes8479]

Thanks for posting the video, they are always interesting and informative.

[@nickrider5220]

Really enjoy your thorough work - you've got another subscriber 👍

[@rickyj2013]

Several models of cat truck engine heads do this a lot. Always gotta keep an eye out.

[@elroyelblander6277]

👍👍right on... pulled a 3406E head off that looked like that..had to get a new one

[@luisgarci6815]

you should check out how they fix cracks in india somewhere I believe and they do a pretty great job for people with low resource its amazing you guys have all the machines they have

[@charlesriggs6406]

Amazing work guys! Wished you was closer to me so i could use you.

[@leightonreese1832]

That CAT will run better than new well done!

[@GickelsGaming]

BEAUTIFUL!

[@sonyhk3824]

It is very interesting and enjoyable with honor and a living conscience. Cheers guys 👍

[@markpeterson6836]

Half million subscribers that's amazing.

[@patrickwendling6759]

Thank you for your knowledge and video's USA 🇺🇸

[@crimsonblue88]

you guys do awesome work! love this format of video hope you guys can do this for a long while!

[@Look_What_I_Did]

Do they? Calling out cracks that exist on EVERY diesel head? I'll bet $100 you didn't know that, but still praise their work.

[@JJRrcracingfoam]

Great work like always

[@tpcoachfix]

I worked at a small local machine shop and we did a lot of valve jobs. My job was to disassemble, clean the head and parts and grind the valves. The boss would grind the seats with stones. A dirty messy job and in my opinion not very accurate. Then I would reassemble the head. I would have loved to have had one of those Serdi machines.

[@stevengillmeister6062]

I want my to fail so I can send it to you haha great work like always!!

[@glennbarker222]

Lovely work as usual.

[@colchronic]

Make sure the customer doesn't use the old valve bridges those look like the newer style of valve

[@TheMetalButcher]

Be a nice candidate for some brass and a torch!

[@Choober65]

Cracked or not, we ALL know you've got the skills to fix this.

[@kurtisgagnon7896]

I recently rebuilt a 366 bbc. Not even 10 seconds after start-up 3 wrist pins seized in the pistons. Have you ever come across something like this? The pistons and rods were done at a local machine shop. Those 3 bound up so hard the rod doesn't even move in the piston

[@anthonyrivers8395]

Pull the picture I got my coffee didn’t know it was a short vid. Good video nonetheless. Good job. Maybe some more airtime on each valves. I could watch a half an hour if you guys.

[@JAMSIONLINE]

I'll try for some longer videos here in the future!

[@Mr_Hatfield797]

KT3406E is a fellow youtuber that has tons of knowledge with caterpillar engines. Also is an Ibd dealer with a shop load of cat parts as well.

[@russelljackson7034]

Right on

[@christopherfarabaugh2034]

It's a dream of mine to do automotive machine work. Everyone is older and getting out of it leaving no one to take their place. Unfortunately without someone to job shadow doing it that's literally the only way to learn. You cant just "go to school" for it

[@ron827]

Love your voice-overs.

[@paulkurilecz4209]

Nice work.

[@Look_What_I_Did]

I can count the number of diesel heads without cracks on one hand. Every single one of them went right back into service still running today.

[@stevemuller82muller65]

Keep up the great work fellas 😎🤙🇺🇲