Diagnosing a sick Detroit diesel 671
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- čas přidán 27. 02. 2019
- I rebuilt this very engine 3 months later. Fresh rebuild DD 671 • Fresh rebuild DD 671
This was a sick detroit diesel 671. Running on 3 of 6 cylinders. Big hole in a piston. Still running of course. - Auta a dopravní prostředky
That thing was boogered up pretty badly! Doesn't surprise me that she was still running, though. Good old Detroits were made to last because we didn't know how to build them any other way. Love those things.
I don't know much about diesels, but I find this incredible that it kept running with that much damage.
A Jimmy will always get you home. If it aint leakin', it aint runnin'.
Great video, and wow. What a hole. I'm wholly impressed with how much damage that engine could take and keep on running. It takes "reliable" to a whole new level.
Used to work on the 671 on LCM 6 while in the Navy stationed with Sea Bees back in the early 1960s. Had a few runaways but were pretty much bullet proof! Great old dependable engines that stood up to all the abuse a coxswain could throw at. Man could those guys handle a boat!
Wright Harris what ran away.....you or the engine?
671 was my favorite for fire engines; it was so loud I really didn't need the siren that much.
In the 70 and 80 I worked on every possible 71, 53, 110, 149 and 92 series you could ever imagine. Seen many 12V71 with 4 pistons with holes in ROCK trucks that were overspeed
Larry Tomb would you happen to know which version of the 671 is in my crown school bus by chance? Trying to find info on the slant 671 mid engine..
@@icenijohn2 mine is a 671 turbo, figured it out. The new hurdle is trying to figure out the air lines for the 10 speed conversion
Now there's an award you don't want to win: "Definitely the biggest piston hole I've ever seen!"
wow back when they made things to get serviced too, so nice.
Detroit Diesels are great - just love them. DD was my customer for many years, spent a lot of time there, used to call me when they had something special on the dyno like one time a huge mining truck engine. Also spent time at Electro Motive and was in dyno rooms testing locomotive engines. Last year was on a USCG buoy tender with two EMD V8 for startup after a long sleep. And . . . I have a pair of 8V71TI’s in my boat.
In the 80's my uncle started a locomotive repair shop in Lakeland,FL..guess due to all the phosphate train loads out of there..So I inherited a TON of old EMD manuals Amtrak manuals from his days with them..It's nice to see how things were once made to be worked on..My father worked for the railroad for 35 years..Chessie System up in WVa then SCL (Seaboard Coastline) here in FL then they became CSX
This engine deserves to live! That's a lot of damage it took and still ran, so while it's expensive, it's worth the work.
My first experience with a Detroit was a 671 in a 10 yd dump truck and it dropped a valve just like this video. I took the head to a old timer machinist down the road and we got the injector out cleaned up the head put in new valves and seats guides and reground the other valves. I put in a new rod cyl and bearings put it all back together, made sure I was right ready to slam the run away flap shut if the engine ran away. Didn't know any thing about setting the rack or this engine other that reading the book. It all came out well and ran great after that. Then went on and drove a water tender for the forest service behind an 871, got the job as I was the only person who was familiar with a Detroit 2 stroke Diesel! Past drivers had blown the engine up! Great engines but have their quirks.
I am glad I watched this video. Now I can really see how the engine is oriented in the bus, and what it takes to remove and install the engine if necessary.
That piston has the custom hole just to make sure the cylinder gets full lubrication.
Beast. Would have been cool to see more on that one
Dude. Ive been binge watching all your great vids. I can't believe you're wearing gloves!!
Wow..comes off WITH the bumper.
I worked on the Jimmys when I was serving my apprenticeship a long time ago. I also worked on EMD's. The easiest way to narrow down a weak cylinder on those was to climb up on the roof and listen to each exhaust. One day a fellow apprentice and myself climbed up on to the roof to listen to an engine which had the brakes on full,but was in Notch 8. This was to make it work so the dead hole would show up.... while we were there, it started moving . the handbrake wasn't on.
Notch 8 when you're not movin? That's a good way to ground fault a unit. And these new 6 axle AC units will eaaasily outpull any handbrake ya put on em. On the upside. No ground faulting.
@@Liam40 We were Apprentices and the loco was already 30 years old. ....we were expected to make the occasional cockup 😀.Some of the other guys let a locomotive roll out of the yard and it wandered down the track towards the main line by itself. Only stopping when it banged into a brace of freight wagons being shunted . No handbrake at all on that EMD dash 8 .
Mercmad,
EMD didn't make dash-8's, that was a GE.
At least you didn't put it in powered mode - unless that is, you went from power to dynamic way too fast. (It needs about 10 seconds or so.)
@@dh-_1011 that wont load the engine though its free reving
When I started as a fireman most local power and switchers were Alco's V-12 244's on the RS-2 ( only had one) and RS-3's plus 539's and 539T's. Cast iron brake shoes and they would walk away with the hand brake on if you gave them full power they would walk away easily. The 539's were 12 3/4 inch x13 inch bore and stroke inline 6 cylinder engines. Idled at 240 rpm and full throttle was 740 rpm 660 horsepower normally aspirated and 1000 turbocharged.
Worked on the ol 71's for years in the Navy, nice and simple like a SBC.
Good for you guys for investing the time and money to keep that thing going. A lot of folks would have scrapped.
I use to make parts for DD engines back in the day.
Later 71 series were the last ones I made parts for. Mid 90’s.
Liar
Dead engine? There are 5 cylinders that make it start and it did reach the workshop! It is true that it is expensive to repair, but it is an engine that can continue to give much more after a readjustment and change of parts.
Greatest engines ever built killed by the EPA and their bullshit. Still turns my stomach to think about it.
Do you realize where these motors would be with today's metallurgy, technology, and computing power? You could probably get to Mars on diesel fuel.
We had some 92's w DDEC and they were so sweet !
@@bubblelvr1 Started under Clinton, but yeah... barry didn't help any.
Not just Detroit's all non emission engines Im in the trucking biz the electronic logging was a underhanded way to push older trucks off the road ! No OBD port no hook up for the E logs they gave me a 2 year exemption but its up for renew soon but I hear from other outfits they are not getting a extension on the paper logs they are forced to buy a newer unit im not going to ILL just start down sizing the fleet and quit in a few years
Saturn Vs did run on diesel!
@@vector6977 kerosine. Very pure kerosine...and yes, the Detroits would not even notice the difference :D
I used to run a Cat lift that was just like that. Smooth as butter, they are. The only problem I ever had with it was with diaphragms going bad in the fuel regulator, but that'll happen with anything that runs on propane. The coldness of the fuel reeks havoc on rubber parts. It gets even worse when the forklift basically "lives" outside, like the one I ran did.
I've seen a 6V92 rear engine coach still move under it's own power with a broken crankshaft, just lost the rear two cylinders so no A/C or battery charging or cooling fan. They are tough old engines, starting to get thin on the ground here in Australia now.
Heya Ray! They're about if you know where to look.
Ray G plenty of them still chugging around in workboats, we still have a 471 in a workboat and swapped 2 very tired 871s for a set of Volvo Pentas
daniel martin
The town highway dept has one here, upstate ny.
It’s in an international straight truck with a huge box on back for leaf pickup.
So every fall it gets to sing it’s song.
Got a 6v53 in my boat, as close to bulletproof as a motor could be
Had a cat that would shutdown every now and then guy drove it like that for at least a year. Was a broken crank crazy af
And it still ran..... Damn!
That engine be like "IM NEVA GONNA GIVE YOU UP!!! NEVA GONNA LET YOU DOWN!!!!"
i had a 2-71 like that. 1 piston was fine and the other had a big hole in it and it sounded OK when i first started it in my shop but then it started raining oil from the ceiling then i knew something was wrong. it ran though.
Just pull the piston and slap it back together. Ran fine minus one cylinder. More fuel efficient now.
Old GM diesel power looks like it has seen its days for sure but says a lot about them to see it at this age thanks for sharing the video
HOLY PISTON. That is the most mutilated piston and head ive ever seen. The simple fact the thing was still laboring along is a tribute to AMERICAN ingenuity and pride in craftsmanship. Great mechanic skills and video. God bless.
The Working Man 82 that specific engine was designed in the good old us of a, but made in Mexico. Due to USA has no raw material.
@@jorgenunez1825 Awsome thank you for the knowledge.
They were built in Redford, Michigan. There might have been another factory in Mexico, but since 1938 right up to today, Redford has been pumping out over 400 engines every day.
@@stanpatterson5033 Thats great. Everyone knows the best items are American made.
A few words of explanation wouldn't go amiss!
6:07.... All you need to know lol.
I remember riding those to high school back in the early ‘70s (Buffalo Public Schools “bus pass” pgm) .. they seemed ancient back then.
Old Detroit Diesel Engines were made solid as a tank! they were made to outlast you, I'm so impressed that it started with that hole on the cylinder, if that happened to a modern Detroit engine the result would have been total catastrophic engine failure.
have a 671 piston in my piston collection. always liked these old engines. sounds like youll frag em when driving but thats when theyre happy. this one otoh had a rough go of it.
Wow!!! thats a hole if I ever saw one!!
There is a good running one of these in portland oregon coming out of the bus soon.
Got to ride that bus back in 2014 on my visit to the Richfield Bus Co. and do they have a nice collection of historic buses.
I never seen someone work so hard to keep engine covers open...
It didn't sound as bad as it actually was, I'm surprised it started at all. I don't think I've ever seen an engine here in Europe still starting in that condition.
That's what happens when you engineer to minmax fuel economy and emissions. You have to sacrifice the ludicrously overbuilt nature of engines like these Screaming Jimmies that makes them so hard to kill.
when starting cold touch each exhaust manifold on each cylinder. The one which is the coldest is the dead cylinder.
The other way is to crack the fuel line to the injector when it’s running, one cylinder at a time. The one that doesn’t change how the engine is running is the dead cylinder.
speed150mph yes that's the way if you can do that. We did marine and generators . Use digital thermometer laser to check each cylinder. Cold one is weak or Dead.
SovietRefusnik1 Golem that is a good method but it has fooled me a few times, depending on the exhaust manifold and turbo setup and the engine design it can fool you. I’ve had a John Deer 6 cylinder that had low power, and had snapped both the pushrods for one cylinder, but because it was on of the middle cylinders and the way the exhaust ports on the head sat, the dead cylinder was only 30 degrees lower then the one next to it, and was actually about 5 degrees warmer then the number one cylinder. So it’s not foolproof.
speed150mph True. Just an old school quick check for old Jimmies two strokes.
SovietRefusnik1 Golem haha yeah, the Detroit’s with there manifold style it works really well. That’s a trick that my father in law taught me. He has a modified tractor for tractor pulling with a 12V-71. That’s where I learned all I know about the old Detroits.
Lots for me to learn here but hopefully with new piston and machining that engine will live again.
That engine has been rebuilt
Fresh rebuild DD 671 czcams.com/video/TA4GT_CZZOA/video.html
I've said this before. God bless Jay Leno because he knows his history about cars and the like. I forget which airplane it is that he's all Ga Ga over, it's either Merlin or Continental radial engines that won WW-2. Someone can correct me on my history, but Detroit Diesel engines are what won the war. Detroit showed up in trucks, if I'm right tanks, and the maritime vessels. Depending on the particular application, the Detroit engines could be mounted front snout to rear flywheel and double the power output. Rearrange the front timing gears and reverse the rotation. The versatility of Detroit engines is in my opinion that helped win the war.
If a diesel engine were a person, this man would be it.
also a perfect 2 valve head we took off to put on a 4 valve.
Thats oldschool
Holey wrist pins, Batman! that might just pressurize the crank case!
Thats a open oil low compression mod on that engine for all those that like to roll coal so much this is how they mod it. Sad to see a 6-71 in this condition detroit 71 series is my favorite.
As soon as I heard it run, I was like "Ooooh. That's very, very bad." I figured broken valve maybe, bad injecor definitely. I wasn't prepared for all of that, though. I guess seeing oil fountain out of the top of the rack is a dead giveaway. I've spent a lot of time around the 6-71 in the marine application, but I know a screwed up one by sound. Poor thing. Hopefully, you can find new parts and rebuild it.
Shouldn't be hard to find parts - the US military still runs a ton of these engines.
Believe it or not you can buy a whole engine kit for less than 8K
See description link to it rebuilt
I'm surprised no one found any metal or fuel in the oil. Were the other rod bearings and main bearings just as worn or was it just that rod?
Put some lights in that shop!!
HEAVY METAL, mon ami ! 💋
Do a search for John R Hollingsworth A/M32A-86 Gen Set. This has a 71 seies 2 stroke Detroit coupled to a 72kw 400Hz generator. Many of these are being turned on for more efficient models. They might be available through GOV auctions.
Easier just to take the doors off?
Time for a 4 valve upgrade!
jimmy hit'n the cosby pretty hard
I would be curious to know if you remember the difference in compression cranking vs running since most times it cranked a few seconds before firing, I know the book says warm engine idling for compression test but I've always wondered if it really made that much difference. Thanks Matthew
Around 30 psi different
Large ceiling fans angled toward the open area would go a long way in minimizing the diesel exhaust in the work place.
Is there a part two ?
That’s a big hole. Must’ve made some noise while the valve head was peening the injector in the head.
Nobody will believe it, but I have a 1968 Chrysler 440 pulled from an Imperial that was allowed to overheat, blew huge holes in two pistons, and the people drove it on home to Texas from somewhere in the Deep South. The thing is undamaged otherwise.
That piston just has a hole for extra aerodynamics and increased fuel economy motor is tight ship it lol
a perfect rust free specimen. oil coater working at top speed. ..
Dr. SCOTT, ICU stat for a 671, possible respiratory failure, charge the defibrillator to 360 joules, clear, no pulse Dr. SCOTT, low compression Dr Scott, what do we do? This is more serious than we thought, we have to remove the head, first thing in morning, not tonight, it is already getting dark, 👍👌❤🇨🇦
This one needed it for sure
Is there going to be a rebuild video for this engine?
Now I know what it is Scott sounds like Drew Carey to me
Is there a follow up video of this video ? If there is I cannot find it. I see you have named so many of your videos with "Detroit 671" in the title.
Would have loved to see how they fixed that engine.....
RudyBeuc a lot of it was videoed. If i get a chance I’ll edit a video of the rebuild with a new crank
I'm surprised it ran at all.
Hole in piston = bad injector or too much ether ?
That new York accent though 🤣
Si sucede , cuando se usan aceites de motor que no son serie Mil L 2104 B los demas aceites tienden a formar una carbon duro tras las valvulas de escape , que no cierran ;se atracan en las guias y don piston cuando sube se encuentra con doña valvula fuera de su asiento y la masacra con los resultados que estan a la vista , Los dos valvulas como ese motor, es mas dificil que le suceda la atracadera ,los 4 valvulas son fatales
i had a few Detroits All i had to do everyday was check the fuel and put in a gallon of oil
Bill Scott which ones and were they in trucks cheers from Australia.
Need to get him new coveralls ,, Detroit service on back
looked like the valve head went down on the connecting rod
Ouch !!
Dam injector with a weak bladder. Set of depends and a smoke and a pancake 🥞😂. Will be good as new. You can't miss that dead hole sound. Shut her down immediately when you hear that. When the cam and lifters are as clean as new from 500 miles of diesel flush it's a dead giveaway.
You had a wanderlodge that was hard starting running on 5 cylinders in another video.
Holy Fuck
The thumbnail looks like an evil eye!
The diesel savant! Its so nice to see a true craftsman thats humble and knowledgeable, instead of the sleeve tattooed, soul patched, flat billed hat wearing douchebags that are arrogant sophomoric wannabes!
Al parecer el mecanico no le pega mucho se lo dice un maestro
Какой ресурс у таких дизелей? Есть на них запчасти?
Could 92 pistons and sleeves fit in that block?
No
You can here the dead cylinder while it's cranking
what do they do with the buses? resell them or collect?
They do historic preservationists at that shop.
I've never seen a Detroit diesel motor that didn't have a leak somewhere somehow, now I know they say all of them leak but not like Detroits, I had a Cat 12 years I've never had Detroit type leaks only Air Bags a Gas Pressure Regulator hoses and raidiator leak.
Rebuild why? It's got three good cylinders. Tell them to come back when it's down to one. Good old Screaming Jimmies, they will never strand you. As long as you can keep it oiled it will get you home with a giant hole in the block.
i know the mechanic has seen them but have any of you out there ever seen a horizontal 6-71 ? its layed flat on its side under the belly of some buses
czcams.com/video/MZdfIaPlxKg/video.html
GMCOGRE yeah in a 1990 Crown. Mid engine. They were great!
How do you not notice that right away, basically missing a piston.
He did notice it right away Ruining like crap shaking and puking oil. Had it towed in
@13:32 I wondered what happened to Robbie Coltrain.
It look like the cylinder have an eye
nice little bus but I think the engine has explosive diarrhea
A 2 valve, probably still has the S injectors in it
I've read of HSV7 if it's a 2 valve it will have trunk type or single piece pistons rather than the cross head type.
Looking for parts for Detroit "Leid Diesel" Newville Pennsylvania Detroit Allison diesel
Did you reuse the crankshaft?
No it was already at .020 before the damage
@@BusGreaseMonkey I'm amazed about looking at some of these bad rod bearings and yet the crank is still usable or servicable. I like these 2-stroke screamers.
its just sweating horsepower
Does the thumbnail look like the eye of a dragon...(8:16)
The story of my life...piston broke!
Old GMC transit coach
Bom este vídeo. Você tem vídeo montando o motor GM de 2 tempos. Deus te ajude.Não falo inglês.
It's a Detroit.. don't they come leaking from the factory? :)
Well it's a Detroit, if there's no oil under it there's probably no oil in it either.
yeah,thats why we call them " leaktroits " -- what do detroits harleys and VW 's have in common ? if they aint leaking there aint no oil in them.
It’s not leaking, it’s marking its territory.
The good old Detroit Drip. Nothing better!
@@DagonNaxos -- it takes a special kinda beast to be able to bleed like hell and not die....
Could you help me on a 8V92 ta
I have a 1979 autocar
Me and my son rebuilt engine -
I wanted more horse power so I put
9215 injectors in. It had 9290
I’m not sure I got them set at correct height. I could not find a setting for 9215 s -
Also I would like to go back and add Jake brake -
Can I do just one side of the engine ?