12v71 Detroit Blower Removal Teardown Part 1

Detroit 12v71 Teardown Blower Removal Part 1
Is My 12v17 Detroit Junk With A Cracked Block
• Is My 12v17 Detroit Ju...
Making Plans For My 12v71 Detroit Diesel
• Making Plans For My 12...
I Buy A 12v71 Detroit Diesel
• I Buy A 12v71 Detroit ...

[@Martmns]

A couple of tips. The older Detroits were so notorious for their propensity to leak oil that they were often called "green leakers" But the oil leaks can be virtually eliminated by swapping the early model stamped steel rockers covers for the later model cast aluminum rocker covers and adding a marine-style 'air-sep' system. If you want bling, the cast aluminum rocker covers can be polished to a near chrome-like shine.

[@marzsit9833]

they were called green leakers not because they actually leaked oil from failed gaskets, the engine is designed with airbox drain tubes that purge oil and water from the airbox and dump directly on the ground because in the old days, nobody gave a shit about pollution.... most modern detroit enthusiasts plumb the airbox drains into a catch can or tank that can be drained when needed and prevent puddles of oil from appearing on the ground. but truckers have an iq of about 50 so when they see oil on the ground, they immediately jump to the conclusion that the engine is shit and that it leaks.

[@FixItStupid]

@@marzsit9833 Still Best HP Per Power & Sound Of Power You Needed A tech Then..... & Now Just Tech. On A Laptop.... LOL

[@danielseelye6005]

@@marzsit9833"If there's no oil puddle under a Detroit, there's no oil _in_ a Detroit." 😉

[@markajohnson4583]

Looks like someone spent too much time in the sun on his motorcycle adorned with a bandanna - ha! Awesome video!

[@Mr_Smarty_Pants]

hahahha...damn, my chrome dome says i've been there too :D

[@rusty7720]

And the boy doesn't seem to like coveralls.

[@kevinmatthiesen8961]

I thought it was a hat

[@carlaustin7398]

Really enjoyed this part 1 teardown. I like the step by step disassembly rather than the cutaway after the component has been removed. Great job. Thanks.

[@alfredmilyard5076]

I’m definitely not a gear head, but I greatly enjoyed watching you work with your son, learning together!

[@davidchristensen6908]

I am not a truck driver nor a mechanic but I am sold on watching these videos. I love you pure honesty about what you know or don’t and what a better way to learn about an engine. New subscriber here and thumbs up

[@williamgurtner4759]

The cooling manifolds, do just that. They create the coolant flow to or from the heads. They're needed.

[@Martmns]

Ditto on that.

[@DionysiosA76]

Buzzin dozen! I believe you said this unit came from a Terex green weenie or rock truck. If it came from a scraper it was likely a TS-24, the 12v was rated at 394hp as the tractor engine, then they fitted a 219hp 6-71 at her stern. If you are looking to turbo do not block off the coolant trombone. At 21:10 that blower shaft can the source of a lot of problems on a v71. A few months ago I was working on an 8v with low fuel pressure issues. Turned out the splines on the blower shaft had been worn after 50 some odd years of service, gave just enough slop to cause problems after 1400rpm. Cool project.

[@hartsfire5706]

The cooling manifolds are a must and a huge help. and yes twin turbo will be a huge help for the loads you are planing. and as you are doing a full tare down you are at the point were the turbo mods are going to be vary easy..

[@daveoftheclanburgess]

Matt is a lucky boy! Having his father encouraging and working alongside is a wonderful relationship builder and bonding process. Best of luck to you both

[@franciscoppola7368]

Talk to Scott at Bus Grease Monkey . He is a fellow Tuber and knows Detroits inside and out. Very knowledgeable.

[@wmgilliland2582]

I agree, at least watch some of his videos on tuning a Detroit for safety items he needs to do before starting it the first time. Like the proper way of using vise grips on the rack in case of run away.

[@HappyHarryHardon]

And straight 40w oil only!!!!

[@danielwaters6131]

Love the fact that you and your son get to work together to teardown the engine. Perfect bonding and learning time .

[@kennyspry5189]

Awesome Video This is going to be a lot of Fun watching. Plus it was really Nice to see Matt listening to you and learning.

[@timdodd3897]

Reminds me of helping my uncle in Michigan. Much more informative then a summer camp. He was a toolmaker for Buick, that had a engine re-building side business. RIP uncle Larry.

[@philipbarr9481]

Awesome video. The father son time is priceless

[@thomasfletcher4765]

Man , this makes me miss the days I used to work on the old detroits ( back in the 80s while in the Army )

[@cassandrafoxx4171]

The other good thing about videoing every step like this is that it gives you a visual record of how things come apart, if you forget something while you're reassembling the engine. You can go back and review what was done to find out what you did incorrectly.

[@fireman_17]

My dad does this all time with his video and take pics of stuff he working.. So if he forgets how something goes back he look back at it.

[@KatherineCracks]

Great to see father and son working and learning together, reminds me of rebuilding aircraft engines with my gran and grandad. I just love a old skool mechanical engine! The genius of keeping things as simple as they can be and the brilliance of controlling everything through mechanical and timing rather than a computer. Love it great video, I’ll definitely be following both channels. My bet for a cool truck to out it in would be a Peterbilt 359 non butterfly (so you can show the engine off easier) or a Mack Superliner. Pete would be my first choice but the Mack could be cool too

[@williamgurtner4759]

Steve, I can not believe that 30 minutes past, that quick! Great content. Here's to that crack NOT being killing damage and being a poor visual repair.

[@dennisdunnuck1708]

Its great you are doing this with your son keep up being a good dad seems like a good kid

[@kennethperian4370]

Good job showing and taking it apart, see ya on the next one and have a good one.

[@TheCRTman]

This is a wonderful video. Father & son working on a Detroit, step by step & by the book!

[@davidmitchell9048]

Great video!! This is going to be a great channel along with your other ones.

[@CCscott]

Matt is a heck of a worker! 👍🏼👍🏼

[@cfcduffysafc]

Great video. Look forward to the following videos on this engine

[@ericdee6802]

Scott Crosby aka "The Bus Grease Monkey" here on KZbin is brilliant with the Detroit 2 strokes. Scott travels the Country in a 1947 Silver side GreyHound bus repairing similar Detroit powered GM passenger buses, Bus Conversions Bluebird Wanderloges etc... He has a fantastic channel, and tens of thousands of follower's. 👍 Scott is a Detroit Diesel on two legs. 🤣

[@lysdexicsoftheworlduntie1881]

12V71 is essentially 2 6-71's that share a common crank. The coolant manifold above the exhaust ports is used as the main inlet and thermostat housing on v drive 6-71 bus cooling systems. As for learning, all of the 2 stroke Detroit gurus universally agree: Know EXACTLY what you have and follow the service manual to the letter.

[@chapleaudick]

Its good to see a the young lad wanting to get his hands dirty. Good job Dad.

[@ericdee6802]

The Detroit diesel, the workhorse of diesel engines! 👍

[@MarylandBornConstruction]

C. J. Langenfelder was a large earth moving company here in Maryland, if I had to venture a guess, that 12/71 is out of a Terex TS-24 scrapper. I only ever saw one TS-24 up close and I'm pretty sure it was a later turbo charged unit & it had two exhaust manifolds that dumped in the center to put the turbos right at the blower inlet.

[@fsctruckshop6537]

I looked them up. They appear to have gone out some time ago.

[@watlertrent5640]

Love the new Channel

[@evetuekiLAM]

Really good 👍👍

[@greglammers9905]

Worked on a ton of 53’s 71’s and 8v92’s over the years in buses, but not a 12v. I knew a guy in town back in the 80’s that had big conventional KW with one in it. Very cool. I do know the turbo motors had 17 to 1 compression pistons versus 18.5 to 1 on the non turbo. Cool project. Good luck

[@jacksak]

I just found this second channel and subscribed... good to see...

[@jacquesleblanc602]

Can't wait to see what this is going into.!!!

[@MyGarage-uu5ld]

Its awesome to see you doing this with your son.

[@timatwell3728]

the chain is kinda like a lovejoy coupler a whole lot of little parts to keep up with you need plenty of zip lock bags to put stuff in with label telling what it is and where it goes keep at guy's you will have it stripped down in no time

[@scarlett-walker4908]

nice work there Steve 😁

[@SOU6900]

I know a little bit about these 2 stroke diesels, and I just learned a bit more about them from this video. Case in point being the different blower drive speed for turbo vs non turbo. One thing I understand about them that you may have to consider is setting up the blowers to bypass on turbo applications. That particular thing I have no clue about doing or how much is involved. Also you'll have to have a special socket/tool to remove the fuel jumpers from the injectors.

[@371508129]

Twin turbos should produce a 50 percent increase in power especially with individual straight pipes. The sound is awesome.

[@edwardsilva895]

I commend you for learning with your son, great job! my thoughts.....twin turbos. Chrome valve covers, jakes, make it loud and proud! And stick with Pete

[@billw4746]

What we have hear is known as a SCREAMIN JIMMY. You can hear them for more than a mile away. I will be interested to see to if Jakes are added to it. I view this channel because I have an affliction for 3406 Cats. I was involved in a repower on a D7 to a 3406. What a change from 180 horse power to about 370. We had the engine detuned we did not know if the transmission would hold up. And then I put over 5000 hours on this D7 doing field work. Thank you for another nice video I know that Detroit will run again.

[@tommyhall8301]

Good luck with the v 12 see yall next time buddys

[@elijames3041]

Nice video

[@mattberg916]

Whatever the final product is make sure you put on a choke flapper. That way in case of a runaway you can kill it without it blowing up. Cool project it'll be interesting to follow along

[@fredhemi4564]

😎🇺🇸Very important 👀🇺🇸

[@joshuaplacka8480]

I live in western md. Up in coal country. There is a guy I know he owns an old strip mine. He literally has a entire building if 12v. And 16v’s just setting there. They are from Euclid trucks and dozers. Some are completely rebuild just waiting to be put into service. I love riding up there and just looking around. He has a fortune setting there.

[@maxfly7079]

Bus Grease Monkey,... on Y.T. is the King on 2 cycle Detroit diesels...he fixes All the older Silver side buses with them... not sure on any v12... it would be one hell of a bus or anything...he is in Western Tennessee on some acres of woods...fyi.

[@TheCRTman]

Not from what i've seen in another vid unfortunately......

[@TheCRTman]

@@mrmagoo916 Exactly and not the king either

[@maxfly7079]

@@TheCRTman He is in My Entertainment World, You Tube... I'll watch others, if their on Y.T.,... got any recommendations ??

[@maxfly7079]

@@mrmagoo916 Got any others on You Tube?? I will watch them...maybe... ✓.

[@TheCRTman]

@@maxfly7079 Watch this video and read the comments..... It immediately changed my thoughts about him. You gotta go by the book. kzbin.info/www/bejne/hmrCk6eXqLd9gtU

[@simonharris1804]

The fun begins 12v71 haven’t had anything to do with them but look like fun to me Yeah label 🏷 everything as it comes apart you won’t forget we’re it goes when putting it back together makes for easier assembly Way to go learn together father and son thanks for sharing 👍💯🇦🇺🦘🦘🦘🦘

[@nfarnell1]

The yellow one is probably from a Wabco mining truck. Many moons ago I had a 1975 Astro 95 Royal Classic, It had a a 12v71 rated at 467 hp. I had the so called beltless accessory drive option. It had the A/C compressor and the Alternator driven directly from the rear drivers. That worked nice for a Cabover.

[@ThePaulv12]

This looks to be a 4 valve cylinder head unit. Not all were 4 valve, so for any performance build you really want the 4 valve head esp if you're going to turbo it up. Don't forget to budget for 12 Jake brakes - you'll want the vulgar sound that so enraged people back in the day at 3:30am when highways still went through small towns won't you? - purely for research and nostalgia purposes of course. Jakes on a 2 stroke are the loudest of all. Technically Jakes (Jacob's brake) is a compression release engine brake. The exhaust valves are cracked open by solenoids (and associated mechanical arrangement) around TDC on overrun to stop the spring effect of compression from returning that power to the crankshaft. Think of squeezing a bicycle pump with your finger over the hole and how it springs back. That springing of the piston doesn't really do much to slow a heavily laden truck going down a hill (unlike a car) forcing the driver to use the service brake, which heats up resulting in a runaway truck. What the Jake does is still allow normal compression but then cracks the exhaust valves at TDC dumping all that compressed air straight into the exhaust. The effect is so effective, that given the correct gear a good driver should be able to use only the Jake on long descents. In fact on V8 2 strokes you have to be careful not to lock the wheels on wet roads. On my 6 cylinder (company) truck it's selectable for 2, 4 or all 6 cylinders. kzbin.info/www/bejne/iaLInamIhcdgl8k

[@haroldbenton979]

All DD's that are 2 stroke are 4 valves to allow for proper exhaust scavenging when the engine dumps the exhaust. I spent many a day overhauling 238 and 318 DD's for my first OTR boss in the winter when the river was frozen. Why did he run them easy cheap on parts easy to repair freaking bulletproof damn near and most of his grain dryers had a 6/71 blower on them to blow the hot air around the grain to get it dry faster.

[@fsctruckshop6537]

I drove a '74 Ford L9000 with a 6v71. It had jakes too. Worked well. Seemed like the muffler was only for looks...

[@haroldbenton979]

@@fsctruckshop6537 try a screaming 318 were the exhaust was less than 3 feet behind my left ear. I lost 40 percent of my hearing in my left ear from that freaking engine. It's sister the 238 wasn't as bad but the 318 the freaking harmonics from it would damn near vibrate your eyes out of your skull.

[@ThePaulv12]

@@haroldbenton979 No they're not. There are many 2 valve heads.

[@richardlazarski4553]

@@haroldbenton979 they have 2 valve heads too. Not all two stroke engines are 4 valve heads

[@shammi8133]

The surprise for me dealing with the v series Detroit was the immediate throttle and horse power response. 8-71 was the last we owned had no Jake and to give ya an idea of how long ago, it was the truck that ran swinging meat.

[@carloselizondo7671]

That is one mean motor. We called it the "Dirty Dozen".

[@danielloveall2952]

That's exactly what I was thinking keep it original

[@wyattburns6436]

Son will soon get down the finese part of tearing down soon enough..God Bless you with a great boy you have there ...every fathers wishes to teach there kids an awesome trade and work ethic ...

[@jonnycash6909]

It will be interesting your thoughts as you take it apart. There are a LOT of parts that make up a 12v71. Even the lifter comes apart into parts (7 parts to the lifter if memory services). I haven’t messed with a Detroit in bout 30 years. You will want the cast valve covers when you run turbos on it.

[@roberttavernia8978]

Very interesting.BOB on OK.

[@charlescaldwell1413]

that's the way u show details like it much

[@ruxoneto6560]

You'll have to run the 2ater manifolds ,the hole in the head to thermostat is less than 1/2 " in diameter if you put big injectofs you will need the extra cooling.

[@lesstrother8546]

Hey and howdy steve and son....hit the ground running...I'll be watching for shure hope you something NON DETROIT...from a fan in oregon...

[@TheUserid82]

When you get the new shop space going it may be worth it to setup a oven for powder coating cooking. A oven that can cook a full truck engine block can also do car/truck rims so you will always have a nice easy cash source once you have some xp at the process. $20-50 in powder coating paint that you can turn into a $200 per rim job with them happy to pay it will make for an easy job for a teen when you are on the road.

[@2263pete]

Going for the sunburned monk look, I see! 😆

[@fsctruckshop6537]

All day at the dragstrip with Mathew.

[@2263pete]

Quality time! Can’t beat it! Stay safe out there!

[@brettdearing2898]

The motor looked to be in pretty ok shape from what I could see the blowers were pretty clean and if they had a lot of blow by the blowers would be covered in oil and the pistons looked pretty good I’m sure the crack in the block is why it was rebuilt before it might of thrown a rod

[@honkie247]

You're lucky to be working with your dad. I sure miss working with mine.

[@cassandrafoxx4171]

Hey, Steve! That's a hell of a sunburn you have on the top of your head!

[@fsctruckshop6537]

All day at the dragstrip with Mathew

[@richardlazarski4553]

@@fsctruckshop6537 i thought you suddenly had hair for a bit

[@user-ni5tr2lz7e]

FSC felt great watching your work on that Detroit engine.Am actually working on the same engine and i really appreciate if you share the manual please

[@Saladon89]

damn, thats an insane amount of pieces to keep track of, u gotta be extremely organized, 1 missed/lost piece and its over XD, not sure why u guys not using an impact

[@hughstephenson2957]

Break out the zip lock baggies and coffee cans!!

[@johnkries8189]

The zip lock bags for sure, add some big turbos and you are looking at 550 hp easy,

[@ko9446]

Any extra cooling on a 2 stroke Detroit isn’t bad. You have done some good research on these engines, you will have no issues building it

[@Halloumiwaffle85]

Was lecter round past your house last and marked up the dome for the bbq tomorrow 🤣

[@PoliticalGangster]

The new paint definenately made it more visually appealing hence the sale. Sucker. LOL.

[@archangel729]

new to channel i hope you are labeling everything and bagging the bolts . not meant to be rude . I learned the hard way on other projects non motor lol.

[@hughstephenson2957]

If you're going to turbo that motor I'd get on the hunt for em..like NOW! The one I did in 1999 I played hell getting the correct turbo sizing!!

[@Martmns]

The modded twin turbo 12V71 - a former 12V71TTAC gen-set engine upgraded and converted to truck use - that I drove for awhile back in 1987 used a pair of turbos originally from a 475 hp 8V71 Silver and worked well. Combined with an air-to air intercooler between the turbos and blowers, bigger injectors and a pair of high-output marine camshafts, it produced nearly 600 hp at the ground and was dead reliable.

[@eagle-tv1iz]

The color of the engine is the typical Detroit Diesel factory color. The bright green paint is the Terex factory color, so the engine was once in a Terex machine and later painted in DD color. In the day, both Detroit Diesel and Terex were owned by General Motors.

[@fsctruckshop6537]

Yes, that is what happened. I always knew this was a rebuildable core at best.

[@marzsit9833]

with the blowers off, remove all of the gasket debris from the block and check these cross-web areas very carefully for any cracks. the cross-webs on detroit vee engines are very susceptible to cracking if the engine has been badly overheated, and if this happens the webs are the first thing to break. unfortunately, when they crack the block spreads apart and there is no way to properly repair it cheaply because it changes all of the internal engine geometry, the only way it could be repaired would be a full teardown, welding up the cracks and then a total blueprint of the block to re-establish vee angle and cylinder bore centers and head deck angles by overboring the block for oversize liners. this is an extremely costly process that could easily cost $20K or more in 2021 dollars. and afterward you would still have to rely on a welded block with no guarantees that it won't fail again.

[@mikeshultz1007]

I have a old wet dry shop vac at my shop just for cleaning up oil spills.

[@buckrogers2828]

Could ask Oshkosh as they have used a lot of Detroits over the years so must have a wealth of info.

[@raywilson800]

Its called a gear an chain coupling which is quiet a bit more beefy than the old "lovejoy" style couplers that frankly just weren't up to the task.

[@marzsit9833]

it's called a sprocket and chain coupling....... the sprocket and chain couplings are also made by lovejoy, just intended for heavy loads like this.

[@stephenhunter70]

When it comes to 2 cycle Detroit diesels on YT I find you can't do much better than Bus Grease Monkey.

[@dannycarcasses3660]

We have them for marine applications and cooling covers are removed

[@evanturner7450]

And on a different note.. I really like my snap-on screw drivers. I’ve got the yellow set lol

[@ruxoneto6560]

No the oil line in the rear blower feeds oil to acessory drive rear bloweris feed from block!!

[@warrenellison6778]

Joe Maser is the Detroit man

[@ToyotatechDK]

The Goblin truck will have an extra engine 😊

[@alspeers6931]

Hey bro as u know the 12v71 was a tough old gal,as most of the Detroit 2 strokes of time all were,but that colour makes me wonder if it may have been a big generator or marine application, just a thought bro,but a real interesting site thank you

[@davidschabel4664]

Interesting pattern on your head, my wives (there were 3) couldn't figure out just my left arm got sunburn and the right didn't, 😅 now onto my out of order videos #2 next

[@fsctruckshop6537]

That was all day at the drag strip....

[@imchris5000]

sometimes you have to use superglue to keep from dropping bolts

[@blueovaltrucker]

Time to get down n dirty and getr built.

[@jasonemmer9505]

Wow can you share the Manuel maybe make it a download for us Detroit lovers

[@rickhicks3477]

Talk to Bus Grease Monkey. They know the Detroits 👍👍

[@matthewdarby6669]

g,day steve,thats GM _DETROIT green.standard color.mtd.

[@roadwolf2]

Well it ain’t a diesel shop without some kitty litter on the floor

[@jimglasscock8169]

Gee! I've seen that oil thing happen in my shop... more than once.

[@turnerfleet3966]

that would most likely have came out of a terex scraper, that’s where majority of the v12 terex engines come from.

[@Darkrif1957]

That green colour is from Terex and Euclid earthmoving machinery .eg loaders, scrapers ,dump trucks and Bull dozers

[@marzsit9833]

other way around, gm diesels were green long before euclid existed.

[@Darkrif1957]

@@marzsit9833 yes true but the lime green bits that they were talking about where from Terex or Euclid,if you want look up Ts 14 or 24 scrapers on google also i operated them in the 70s

[@markrobison9770]

You should definitely get with Ole 2 stroker he plays with those screamin detroits like crazy

[@jdunlap007]

If I was dropped on a hostile alien planet? My weapon of choice would be a AK for the simplicity in the field and the engine in my All Purpose Vehicle would be a Detroit Diesel 💯%

[@byrontaylor9235]

I meant to say this in the last vid but im wondering if this motor could have been a marine application originally or possibly in a tank

[@thomaskirkpatrick4031]

I mentioned on another video, that the engined was very clean, now I know why. Who ever painted it, actually did a decent job, it looks like he removed and cleaned parts, then reassembled. So you have to ask yourself why did he go to all that trouble? Was he having trouble selling it? Was he thinking of using it?

[@Ol2Stroker]

You can't just block those water ports off that is how the water flows from the thermostat housings through the head.

[@marzsit9833]

second that! each cylinder has it's own individual coolant port, block any of them and you'll really regret it fast.

[@Ol2Stroker]

@@marzsit9833 actually not the case either. In fact thats an early style water manifold as the later ones were shortened to only be 4 cylinders long after engineering found there was no negative impact to cooling.

[@dp.oennismaurer205]

Steve, the original green is either the Euclid or Terex color. When you do get done with this, make sure that you use Chevron Delo straight 30 oil, not multigrade and the right antifreeze. To be sure, check with Scott and his son Tyler at Bus Grease Monkey. Tyler also has a You Tube channel Indiana Diesel.

[@tiredoldmechanic1791]

The color on the engine now is a Detroit Diesel alpine green. The yellow color can be seen underneath as they remove parts. He said it was the yellow one he saw for sale before. Somebody painted it to increase it's eye appeal. I'm sure Detroit Diesel would paint engines any color the buyer wanted. The 6-71s in the Ford trucks I worked on were painted dark blue. The 8V71s were alpine green in a Brockway and a Ford but we did have a Ford cabover with an 8V-71 that was painted dark blue. The ones in the American cranes were yellow. We put a new turbocharged engine in one of the trucks to get more power and that was silver. I think the turbocharged engines use different pistons.