Detroit Runaways And How To Prevent One

[@adamolczak5827]

Last week, My Dad unknowingly bump-started a recently acquired 671 powered dump truck that had been sitting for 10 years. By some miracle, it just sat there and idled perfectly while running on the decade old fuel in the tanks. I was horrified when he told me later in the day that he had it running, and fortunately this video existed to better explain my reaction.

[@detroitgarage9430]

Some times you get lucky and the injectors don't stick.:) Thanks for watching.:)

[@leroygreen1877]

I wish i had that flapper valve for my wife!! Her injector is stuck wide open!!!!

[@detroitgarage9430]

:)

[@jimmyduncan7650]

My attorney fixed a similar problem for me. FREEDOM!!!!

[@chrisseger6870]

I've said it before and I'll say it again... Detroits don't run away, the mechanics do. Awesome video as usual. Love the builds and knowledge I gain from em. Smart man, you are.

[@detroitgarage9430]

Thanks.:)

[@beaverdam3252]

I just bought a aluminum 353 an that's the first thing I done was pull the valve cover had stuck injectors I love Detroit's an I enjoy your videos keep them coming

[@detroitgarage9430]

Thanks and thanks for watching.:)

[@erikturner8687]

Finally got around to watching this! Very helpful, thank you. My 4-53t has been sitting for about 6 yrs now....I will heed your advice!

[@detroitgarage9430]

:)

[@RodgerMudd]

A generator on a Tugboat I crewed on had a 6-71 generator. The engine was changed out and the new one ran away on start up. Air intake never shut finally the windings in the generator rotor were thrown out and jammed it to a stop. Was most exciting sparks and all.

[@detroitgarage9430]

I bet, I've never personally experience one and with any luck never have to.:) Thanks for watching.:)

[@Chief351L]

Excellent & Very Important Video to SAVE especially with all the people that are buying these old buses to restore and know nothing about what they have and especially when they don’t have access to a quality mechanic like you and some others here on KZbin. Great Job!

[@detroitgarage9430]

Thanks and thanks for watching.:)

[@squirrelchaser2840]

You are so awesome. I am trying to start up my hatteras and this is critical info. I got lucky on starboard but your 1-2 year and could have been stuck note is key. I know how to block intakes but thank you because i will do more diagnostics now and i will have this thing ready and it is going to save me $ if i need oversight. Your rock. Thank you

[@detroitgarage9430]

Thanks and you're welcome, if they've sat for that long, only takes a minute to pull the valve covers and see if they're free.:) Thanks for watching.:)

[@Caje-zf8md]

I have a 1960's inline 6-71 DD that I run twice a year. The flapper was rust-welded open and the cable leading into the cab did nothing. I removed the blower cover and had heat applied to free up the flapper shaft. The return springs on the shaft were also shot but the shaft/flappers are now freed up. My mentor attached a new cable to the shaft and ran it back into the cab where it can be pulled in case of an emergency. I hear a lot of grumblings about Detroits not having power but for an engine that was in production for 60 years, I'd say that that was a successful design.

[@detroitgarage9430]

Nice fix, it's nice to have a functioning emergency shut off.:) As far as power is concerned, they aren't bad if you tune them correctly. They got a bad rap, but were often compared to engines with twice the CI displacement. I'm daily driving my 4-53T at 240HP with larger injectors and water meth injection. I also have to remind myself it's only 212 CI.:) Thanks for watching.:)

[@trevorgottschalk5396]

Good knowledge video I started my 6-71 yesterday in my L9000 ford and it went from 0 to a billion RPM in 1 second. I just had it running two weeks ago. Wish i knew what happened. Glad my blow flapper worked. Still have manure running down my leg. Wow was that noisy and smokey. Never dreamed this world happen

[@detroitgarage9430]

Lol, ya they sure go off quickly.:) Thanks for sharing that.:)

[@pablolizano8081]

My 6 92 did the same thing and after that I doesn't stay at idle anymore. Any idea why?

[@detroitgarage9430]

@@pablolizano8081 Could be a number of things, from buffer screw too tight to a rack that's out of adjustment. Time for a tuneup.:)

[@dangoldbach6570]

A CO2 fire extinguisher is a very good idea with a Detroit. I have two Detroits, a 6v53 and a 6v92T, the 53 absolutely had stuck injectors and I knew it so I pulled the valve covers and worked the rack until they were free. Luckily I didn't have a runaway but that CO2 bottle was always within reach. The 92T is a fire pump engine rated at 496 HP, you better believe I have that bottle right up my ass whenever I fire it up! Haven't had to use it yet, but, better safe than sorry

[@detroitgarage9430]

If they're used on a regular bases it's very rare to have a runaway. If you're running the new throttle tubes like in your 6V92T it's almost impossible to have a runaway.:) With the exception of my 2-53, I've converted all my engines over to the new throttle tubes.:) Thanks for watching.:)

[@paulnolan1352]

Never had a runaway, I used to work on 8&12v71 and 92 series Detroit’s years ago. I can’t believe how dry that 6v looks, start with the Governor Housing because the Fork in their can freeze then go down through both Links to the injector Tubes then check the “spring “ in the Injector Rack For return movement. A good oiling usually works most of the time and finally, the kill flap on top of the Blower Housing has a Pawl mechanism with a Bowden Cable attached, check the mechanism hasn’t stuck tight, again, a bit of oil usually does the trick. Finally, run the Engine and check it stops then restart and let it scream!- you’ve just reached Detroit heaven!

[@detroitgarage9430]

Thanks, engine was rebuilt in the 90's by Detroit Cullens and had never been started prior to this video.:) I freed up the injectors and fired it up. One injector was still not right, so I replaced it with a reman unit. Runs like a charm.:)

[@paulnolan1352]

@@detroitgarage9430 great 👍 thanks. Paul 🇬🇧

[@wildcoastadventures7535]

Thanks for this valuable lesson. I have an 8V-71 sitting for 5 years I'm needing to fire up soon.

[@andrewking4885]

First of all check the rack and injectors, make sure none are stuck. Also check the fuel stopper and have a flat sheet of metal to put over the blower. They can climb to 5000 RPM real quick and it's scary.

[@wildcoastadventures7535]

@@andrewking4885 Thanks for advice. I shall do so. Luckily, it has a flapper on the airbox inlet. ( Terex 82-40 dozer)

[@andrewking4885]

@@wildcoastadventures7535 Cheers. there's some good footage of 8V powered terex dozers on Ytube. The 318 might be noisy but extremely reliable. The 71s were always my favorite engine. I take it your American. I'm from Australia.

[@wildcoastadventures7535]

@@andrewking4885 yep, have been looking up videos of Terex dozers for a while. Some great ones, and every single one convinces me to invest in some seriousear protection. Nope, I am South African. On the East Coast of South Africa, between the cities of East London and Durban. Beautiful, natural undeveloped rural part of ourcountry with an awesome temperate climate and sea temps between 14 & 22°C

[@andrewking4885]

@@wildcoastadventures7535 That's amazing that proved to me you can find a Detroit Diesel anywhere in the world even off shore at Asian areas in boats. I'll send you a 6-71 story tomorrow in log truck climbing a hill also a twin stick 6V53. It's LG revisited ep 1 in New Zealand.

[@tttco]

This is a great video. Thanks for the video. My 453 had a stuck rack when I bought it.

[@detroitgarage9430]

Thanks, I’m glad it’s helped. Thanks for watching.:)

[@captnemo8069]

I own a large boat with two 4-71s, in Oct the raw water heat exchangers get winterized, in April/May I open the raw water seacocks and start them both up after setting 7 mos. One such Spring start-up I was in the engine room crouched between the engines, hit the start button on one and it took off screaming. My first thought, closing the fuel line valve would stop it, no that didn't work, it began sucking fuel up through the return line without a shut-off valve. Final thought, nervously fumbling to get the air cleaner off, but having nothing within reach to block the air intake I pulled my T-shirt off, rolled it into a tight ball and held it over the opening, that suffocating the engine until it stopped. Yes, later found that one injector held the rack open at full throttle. A scary situation, but alone crouched next to a runaway was the worst. No I didn't run away, just got to it.

[@JohnAdams-to5ch]

Quick thinking. Well done. Any adverse after affects?

[@mysticridgedesign9857]

Helps lots I am bringing a 318 back and was going to start it this weekend. Until now haha I will be doing a bit more before I push the go button. Thanks!

[@detroitgarage9430]

Awesome, have fun with the 8V71.:) Thanks for watching.:)

[@edwardglamuzina3421]

I just seen your channel and your video on preventing runaway. I am now a subscriber. Have you ever have a 671 run backwards? In 1972 one of my first jobs I was dumping dirt in the fill and as I pulled forward I stalled the engine. I pushed the clutch in real fast and it came back to life only it sounded really bad and exhaust smoke was pouring out of the airbox . It was sucking air through the exhaust . I shut off the fuel and the starter got things spinning right again. It did scare the heck out of me but I knew what happened. I had a Sachs 2 stroke dirt bike do the same thing in 1971. But at 15 yrs. old I was worried I hurt the bosses truck. Turned out that the truck was fine and I never had it happen again.

[@detroitgarage9430]

Thanks for the sub.:) I've never had a Detroit run backwards but have had a Mercedes OM621 run backwards.:) This happened time to time on most of the diesels from the 60's and 70's if you stalled them and they happened to start again in reverse. Made mess of the oil bath aircleaners, but didn't harm the engine.:) Thanks for watching.:)

[@devinrogers6877]

Great info, real informative 👍👍 now I gotta check my 8v and see if it's got the springs or not .

[@detroitgarage9430]

If it's an N engine, then it most likely has the 2 screw tubes. I'll be converting this engine over to a spring rack in the future. Thanks for watching.:) Here's a video of converting to a spring rack on a 353.:)kzbin.info/www/bejne/opK3eayeitN8gZo

[@Hitman-ds1ei]

Just before you go cranking a detroit that's been sitting for a while and you have verified the racks move, prime fuel system with a good pump, an old pump off the blower run on a drill or unbolt yours and put drill on and check return fuel into bucket, the injectors need to be full of fuel before you start actuating them by cranking over motor as they are a unit injector and are lubricated by the fuel or you may end up with a stuck one later on, the other thing is only non turbo motors have a flap, no matter which engine you have always have a CO2 fire extinguisher right there as it will stop any diesel motor if discharged into intake, never try to block intake on turbo 2stroke detroit to stop it, as they have different blower seals and can be turned inside out and allow oil and air into blower thru shaft area and then you cannot stop it unless you have CO2 so have CO2 every time you go to start an unknown engine

[@detroitgarage9430]

Thanks, all six injectors were stuck, freed them up and it now runs again. Of the six injectors, one was replaced due to a miss fire. Here's the first start, thanks for watching.:) kzbin.info/www/bejne/l5XNY5ScmNiFiKs

[@jmyers9853]

i had one runaway but i was ready for it. always check the rack of any engine not run in the last year.

[@donniebagwell9536]

Great explanation, best sounding engine

[@detroitgarage9430]

Thanks.:)

[@pedromarques7509]

Good information, sr. Thanks

[@detroitgarage9430]

You're welcome, and thanks for watching.:)

[@Jon_Flys_RC]

I had a 4-71 on a tug boat mated to a flywheel plate running a hydraulic pump for a towing winch. The set screw on one of the rack fingers came loose, and the engine was stuck at full fuel on one cylinder with the other 3 racked out to shut off. Other than the engine not wanting to rev up it didn’t have any audible sound to tell you what was wrong with it. It just sat there idling away with 1 cylinder pushing the other 3. We also found out the damper door gasket leaked because we had to shut off the fuel and let it starve to get it to shut off.

[@detroitgarage9430]

I've been lucky and haven't had any issues. Most of my stuck racks are from engine sitting for a long period of time. I always check to make sure the rack is free before starting. For the engines I run daily or weekly I've never has any issues.:)

[@Jon_Flys_RC]

@@detroitgarage9430 everyone forgets that after the engine shuts down the governor racks to full fuel if it’s a mechanical governor. Stuck injectors = see ya later. The only time they stay at shutoff is a Woodward hydraulic and they need engine oil pressure before they start to move the rack.

[@detroitgarage9430]

@@Jon_Flys_RC Yes very true.:) I just fired up my 3-53T after 3 years of sitting and one injector was stuck in the full fuel position.:) I just exercised the injector, it's rack and it freed up.:) I modified this engine to the modern single screw spring rack, so it wouldn't run away even with the one injector stuck open.:)

[@knotfunny]

Runaways can be scary. What i found interesting in DD runaway videos posted on KZbin is that they seem to hit a limit of maybe 3500ish RPMs (guessing here). Haven't seen any of them throw a rod. I'm thinking that's because the exhaust valves start floating at those RPMs, keeping the engine from going any faster. Those that were intentionally destroyed quit because they seized or had blower failures. None seemed to have any extra ventilation ports due to connecting rods that tried to escape.

[@detroitgarage9430]

True, they take an amazing amount of abuse before they stop.:) I have yet to find one with a hole in the block. I watched one they tied the rack fuel full and let it go and would not blow up. They ended up spraying cans of ether into it before it finally seized.

[@knotfunny]

@@detroitgarage9430 I remember that vid. 😁

[@detroitgarage9430]

@@knotfunny :)

[@andrewking4885]

When using the flapper emergency the blower can get the seals gaskets unseated and should be removed and checked. That's what a mechanic told me

[@detroitgarage9430]

Yes, very true.:) Should always be checked that it's free and working.:)

[@juniinc40]

Great video! Do you know if 6V53 has block inspection covers like 671 series? What's the easiest way to inspect sleeves on a 6V53? TIA!

[@detroitgarage9430]

Thanks, yes the 6V53 has two airbox cover on each side of the block. Covers can be removed and a borescope used to inspect the liners.:)

[@patrickmcgoldrick8234]

I witnessed a runaway 8V 71,in a W 9000.a very scary and spectacular sight.

[@TheMatrixgod]

in this video the governor that is on the bench looks like my governor,the only difference is the weights on the shaft,mine is a single weight,righ next to it the housing cover has a small crack but i dont think it will hurt anything,my main concern tho is that the shaft with the weights is not tight has a little play a quarter inch back and forth,(is that normal),will it be ok once in the bower>and also you mentioned you are going to change the single weight governor to the limited,it would be awesome if you do a video on that explaining both and the diffrences and how you will do it,there isnt no information on this no where,outside the manual.thanks mario

[@detroitgarage9430]

A little play is normal.:) I'll do a video when I swap out the weights from single to double. I have a nice double weight I'll swap in.:) Thanks for watching.:)

[@TheMatrixgod]

@@detroitgarage9430 nice thanks,like i love watching your vidoes so informal and interesting,i wouldnt be doing what im doing if not watching them,it gives me so munch confidence as these engines are like mysterious,not alot of info on them,just on new engines,even back then when i bought this boat 1995 no information anywhere but the manuals .thanks mario

[@detroitgarage9430]

@@TheMatrixgod Thanks I'm glad they help.:)

[@charlesbennett9461]

If your wrist pin seal leaks the engine will run away it will suck the oil out of the oil pan if the slobber tube on the side of the block plugs up it will also run away it will suck oil if they don't run away then where did the term come from?

[@detroitgarage9430]

That's also possible, but very rare.:)

[@charlesbennett9461]

@detroitgarage9430 what's even a four stroke diesel can have a turbo seal go out and have a complete meltdown right on the side of the road happens every day

[@detroitgarage9430]

@@charlesbennett9461 Very true, the nice thing about the Detroit is the airbox. Everything has to run through the blower and into the airbox before it can be ingested into the intake ports. Depending on the amount of oil being ingested most of it will go out the airbox drains. In the 53 series, the ports are high, so would have to be a lot of oil ingested before a runaway occurs.:)

[@detroitgarage9430]

@@charlesbennett9461 P.S. I broke a liner on my 4-53T one time. Was on an 8% grade and had to drive it for a 1/4 mile or so before I could get off the hwy safely. Couldn't see anything behind the truck with all the antifreeze being burned. The engine consumed most of the 50/50 antifreeze it that time.:) I was surprised it didn't run away, antifreeze is very flammable.:)

[@id10tcertified]

They can also suck the hot oil out of the blower drain box (which is the most common way) which lights em up and off you go full noise and then some until it either runs out of hot oil, blows up or stand on the brakes and stall it.

[@detroitgarage9430]

Very true, If the airbox drain are plugged this could happen. Thanks for watching.:)

[@popilirol]

Hello, I have a 1974 Michigan 125B tractor shovel fitted with Detroit Diesel 6V71N. Today my mechanic tried to start the machine after sitting for 8 years, and the engine over speeded (runaway). Fortunately for me, I acted fast and pulled the air choke lever to shutdown the engine which saved it. Any advise how to proceed from here? Thanks a lot.

[@detroitgarage9430]

Pull the valve covers and free up the stuck injector. May be more than one after sitting eight years.:)

[@popilirol]

@@detroitgarage9430 Ok I will watch your next video in-series and will do that. I also subscribed to your channel because your videos are awesome for Detroit Diesel owners. Thanks again!

[@mog5858]

great info thanks for sharing.

[@WARD5KUSTOMZ]

Would stiction eliminator help keep the injectors loosened up?

[@detroitgarage9430]

Possibly Archoil might work or a similar product. The best prevention is to keep good fuel in it and run it regularly.:)

[@WARD5KUSTOMZ]

@@detroitgarage9430 yep.

[@ksw501]

Saw one started this morning, was a runaway, have you posted a video on how free up the injectors? Do you recommend replacing or repairing injectors? Thanks

[@detroitgarage9430]

It all depends on the condition of the injector. I replace badly seized and worn injectors, but keep the newer ones that aren't seized so bad.:) To free them up I take them apart and use penetrating oil and soft brass to free them up. If they don't come back to being free and spraying well I replace them.:) Here's a recent video I did freeing some 8V71 injectors.:) kzbin.info/www/bejne/bme7pnWbpMt8rck

[@whitetiger8652]

Very informative. Thanks!

[@detroitgarage9430]

Thanks for watching.:)

[@RAULSRDAVID]

Good day sir can i fabricate a tool to check the hieght of injector

[@detroitgarage9430]

Yes you can and could also use digital calipers.:)

[@AvtomatKentucky101]

I know this is a old video but I have a question. I have a 3-53 Detroit and the injector rack on mine feels way too loose instead of being stuck like this and I am wondering what could be causing it. I believe mine has the later throttle tube although I can’t remember off the top of my head as I am at work right now

[@detroitgarage9430]

They should be nice and free.:) The rack should spring back quickly with no binding or resistance. Sounds like yours is working correctly.:) The resistance added is usually just a spring so it goes to idle quickly after.:)

[@AvtomatKentucky101]

@@detroitgarage9430thank you sir

[@johnbaggus9966]

Can you tell us what the shims in a variable speed governor do please

[@detroitgarage9430]

I've used flat washers and brass spacers to shim mine. Call PCIndustries and they should have the shims. www.powerlinecomponents.com/ Thanks for watching.:)

[@stevebarz5125]

The engine over speeds by the book. “ Run Away” is slang for the mechanic runs away in fear!

[@yamaharidr450]

Question. I'm working on a Kohler generator that has a Detroit 8v92. After it sticks for a week it will start up for it's weekly exercise and overspeed.(exceeds 65hz) almost like it runs away for a brief second. Restart it and it's fine. Any thoughts

[@detroitgarage9430]

What governor do you have? Thanks for watching.:)

[@erickbell1691]

Hey man I have a question about a 6v71 dump truck I'm fixin to buy figured you could help

[@detroitgarage9430]

Sure.:)

[@erickbell1691]

@detroitgarage9430 he says it runs real good and then cuts out going down the road then comes right back in the more he drove it better it got would you have any ideas I noticed he drives it like a normal diesel he doesnt wind the ol Detroit should be

[@detroitgarage9430]

@@erickbell1691 Sounds like fuel starvation.:) Check fuel filters and fuel lines.:) If not fuel starvation, check fuel shut off solenoid.

[@erickbell1691]

Sweet thank you man I'll do it this will be my first one I've been a fan of the old Detroits since I was a kid working on them will be a new experience

[@detroitgarage9430]

@@erickbell1691 You'll love them, really simple engine.

[@TheMatrixgod]

my engine is the 692 ,looks like this one in your video,recently i noticed a clear ring around one of the injector cups,all the other injectors have a oil film,is that a indication that the injector cup is leaking or maybe a fuel line,but i just dont see how it would cause a half clear ring around a injector cup,thanks mario

[@detroitgarage9430]

Possibly, run it with the valve cover off to have a look. Is it making oil? Leaking injector cups usually leak coolant, but if the injector clamp is loose can cause compression to leak past. By pulling the cover and running it for a while you'll be able to see if anything is leaking.:) Thanks for watching.:)

[@TheMatrixgod]

@@detroitgarage9430 thanks,your videos are far from the best ive seen and learned so munch,im still waiting for the blower to come in and i will defiantly check that,what you said about the injector clamp loose sounds like the problem,and the other thing i noticed,when you did the timing,you mentioned the order the engine fires and looking up my model its a right hand turning engine,so when the mechanic did it 2years ago i clearly remember him doing a left hand rotation timing and in the manual the engine is a right hand so the engine is not tuned right,after seeing your videos im confident i can tune the engine and torq the engine also,thanks mario

[@detroitgarage9430]

@@TheMatrixgod Thanks, take your time and follow the steps in the manual and she'll be good as new.:)

[@TheMatrixgod]

@@detroitgarage9430 well received the blower today and a little disappointed,someone told me to exchange the blower rather than rebuild,but the exchange one looks alot older than mine as mine was a 94,but what bothers me is that its all pitted with holes where the inlet attaches to,even rust in the holes,all along where the gasket attaches inket side of the blower,so i called back the place and thinking of rebuilding the one i gave them and just exchanging this one,the ups is more expensive than the job,haha and then another thing popped up and the governor housing which i sent all together came,they i guess cleaned it and painted the exterior,but looking at the interior where the weights are on the shaft,i see cracks on the housing,one is like a inch and other small,now im not sure if the housing was already cracked or maybe in the shipping,but what i dont get is they cleaned all the oil and painted the exterior,how can you not see the cracks,when i was not even looking at that and found them,maybe thats why they didnt attach the governor housing to the blower,haha, but now not sure what to do,maybe they were there from the start ,maybe it wont cause any issues,so not sure what to do with that,the blower i was going to send back but after seeing all this not sure if i even want to work with these guys,anyways thanks for responding and sorry so long,thanks mario

[@detroitgarage9430]

@@TheMatrixgod That's nasty, I hope you get your old blower back or another in better shape.:)

[@anthonyyoung7344]

I have seen a detroit engine run away and suck the flapper out of the shut down.

[@detroitgarage9430]

When they go they sure go.:) Thanks for watching.:)

[@wazza33racer]

then what happened?............dont leave us in suspense!

[@detroitgarage9430]

@@wazza33racer All injectors are freed up and the engine is started for the first time in 25 years.:) Runs well and will be a future project after the 353 and 253 are finished.:) Thanks for watching.:)

[@rustychrome]

Can the later safety racks be retrofitted to an older engine?

[@detroitgarage9430]

Yes, I made one for my 3-53T from a 4-53T rack. Here's what I did.:) kzbin.info/www/bejne/opK3eayeitN8gZo

[@tomjones-Hawaii]

Do all 453's have an air flapper? i have never seen one on my 453..

[@detroitgarage9430]

No, only the N models with the 2 screw racks have them. The 4-53T's don't have them. I'm not sure if the later N models had the spring racks or not, but if the did they might have done away with the air flapper on those as well.:)

[@MrSehka77]

Hi I liked you videos seems like very knowledgeable on this old 2 store detroits , I have 8v92 silver single turbo .. I have a bit of etheir oil or fuel leaking on the side of the blower passenger side seems like it might be coming from turbo is right in top ? Do you know if this dangerous i heard alot of detroit you do.not want to have a leaking seal in blower can get oil and run away ? I've been a bit worry this can happn ,? I believe truck has aftermarket solenoid for fuel cut off looks similar to the one on your other video the one you installed believe it's in the same spot as yours ? How does that work ? Just want to have piece of mind and be ready for anything that can come.up ?

[@detroitgarage9430]

It's hard to answer your question without seeing exactly where and how much oil fuel is leaking. It's better to isolate and repair the leak.:) The fuel shutoff turn the fuel rack to no fuel and the shuts down. Get a copy of a Detroit 92 Series manual and have a read on it as they cover all the aspects of this engine. Detroit make really good easy to read manuals and is an asset to have.:) Thanks for watching.:)

[@truckfixerme]

Always have proper working air shut off flap. Detroit’s will run away do to leaking blower seals and wrist pin retainers. Running on their own lube oil. Love those engines.

[@detroitgarage9430]

Thanks and thanks for watching.:)

[@MrSehka77]

Hi, I have 8v92t silver where are these air shut off flap located? Also been having a bit oil or fuel leak possibly from turbo to side of blower ? Is this dangerous and is what your talking about leaking seals in blower ? Or you referring to oil seals inside blower ?

[@invisiblekid7374]

Ok so I’m confused here. I thought it was called a runaway because the engine blows a turbo seal and starts running on its own oil. And because it can drink up as much oil as it wants it can severely over rev. Wouldn’t the situation in the video just be the engine stuck at full throttle?? You could cut the fuel line and it would shut off.

[@detroitgarage9430]

For most diesel with external injection pumps this is the case. For Detroit Diesels this is different as each injector is it's own pump. Once the rack is stuck in the fuel fuel position the governor no longer controls the fuel to the injectors. This cause the engine to runaway in a similar way other diesels run away from oil. If a Detroit runs away, you can stop it by either shutting off the air or fuel source.

[@invisiblekid7374]

@@detroitgarage9430 ok, so basically it can drink as much fuel as it wants since the governor is not controlling it anymore?

[@detroitgarage9430]

@@invisiblekid7374 Yes it will drink fuel and eventually come apart, or seize up. Same results if it were to run away on it's crank case oil.

[@zacb7427]

The governor is a speed limiting and it wont run away. Theirs a difference between full throttle and a run away

[@detroitgarage9430]

That's true, but when the rack is stuck full throttle, then the governor cant limit the speed.:)

[@mahamaneabdoulnasser8445]

Good evening my big one i would like the order of injection of the 2-stroke detroit diesel V8 Engine i have difficulties to have its normal timing please help me please.

[@detroitgarage9430]

8V71 RH rotation is 1L-3R-3L-4R-4L-2R-2L-1R. Thanks for watching.:)

[@mahamaneabdoulnasser8445]

@@detroitgarage9430 Thank you my grand master.

[@carolinemcnabb9957]

there.s more than that to go wrong had a valve bridge break and wedge the rack another time an injector return spring shattered and wedged the rack resulting in total destruction and nearly bankruptcy they rev so fast the manual air trap won.t always help

[@detroitgarage9430]

Wow nasty, I've seen broken injector before.:) Thanks for sharing.:)

[@edward9862]

Good info!

[@detroitgarage9430]

Glad it was helpful and thanks for watching.:)

[@davemick8620]

Good video thanks.

[@detroitgarage9430]

Glad you enjoyed it and thanks for watching.:)

[@AntonioFigueroaJr-r7l]

What year of 6v71?

[@detroitgarage9430]

If I remember correctly I think it's 1964.:)

[@AntonioFigueroaJr-r7l]

@detroitgarage9430 I did on 1978 a671 with supercharger that my first to change new o rings and rubber stings for head NO GASKET I am learning interesting I am deaf 🇵🇷 guy diesel mechanic

[@AntonioFigueroaJr-r7l]

Three belts first belts for fan and air compression...second belts for ALT and air compression and third belts for steering power back of motor I saw that old motor wow

[@AntonioFigueroaJr-r7l]

8 cycle head straight not "V"

[@detroitgarage9430]

@@AntonioFigueroaJr-r7l It certainly has room for a lot of belts.:) THis engine came off an idustrial application, was rebuilt in 1995 and never used.:)

[@Deezalmech]

Big ass service manual makes a good shut off tool or flapper valve.

[@detroitgarage9430]

Lol, very true.:) Before I new these engines well, I used to use a phone book.:)

[@gordoncorey8023]

Time setting

[@syedpullankottummal6930]

👍

[@ryanbeyea2834]

Hi

[@detroitgarage9430]

Thanks for stopping by.:)

[@johnblood3731]

Detroit's do not run away. The mechanic does.

[@detroitgarage9430]

Lol, thanks for watching.:)

[@joek0617]

I avoid runaway by not fucking touching the governor lol.

[@detroitgarage9430]

Most runaways are not due to touching the governor, but by stuck racks. Governors are very simple, easy to adjust and rebuild.:)

[@ryanbeyea2834]

What's up

[@detroitgarage9430]

Thanks for stopping by.:)

[@gordoncorey8023]

Full full

[@gordoncorey8023]

Or rack

[@johead8516]

I know Jack shit about engines but like in this video the rack being wide open and stuck it’s not a runaway situation, it’s a full throttle because a true runaway runs running on its own oil… both situations resemble each other but a open rack is not the same as running on your own oil

[@johead8516]

Runaway vs open rack

[@detroitgarage9430]

It doesn't matter if it's running away on oil or fuel, the results are the same. With a stuck rack in the open position the engine is ungoverned. Although the fuels may be different, (diesel or oil) both condition result in the same ending.:) Thanks for watching.:)

[@johead8516]

@@detroitgarage9430 ohhhhhh k I have a better understanding of it now

[@johead8516]

Another question.. before I ask tho bare with me cause some questions may sound dumb but it’s because there so many conflicting stories of Detroit diesels or pretty much any diesel but it’s honestly frustrating and aggravating because I hear this about Detroit and ok I believe it to be true but then I hear something else about the engine… when I realize the person has no idea what they are talking about… it aggravates me because I spent all that time tryna learn but then I have to learn it all over again… it’s just fucking aggravating and I don’t even know what question I was gonna ask you

[@johead8516]

Examples- 2 stokes don’t have much power and a 4 stroke is more powerful, then I see a video on KZbin saying 2 strokes or more power… or can’t use 2 strokes on the road anymore because they are illegal, then I hear the 71 series is old and are no longer in production and they don’t make parts for it anymore but then I flip on a channel and this guy Building a brand new 71 series with all the parts and everything

[@jeffjames1743]

And the modern "fuel" doesn't help

[@detroitgarage9430]

Very true.:)

[@simonharris1804]

It makes me cringe when you see another will it start video and straight of the bat you know it’s guna run away Everybody’s scrambling for something to shut it down 🤦 And sick of seeing these cold starts Getting old

[@detroitgarage9430]

True, it’s to bad people do that, but they are just chasing views. They can make far more on the run away videos than trying to sell the engine. Thanks for watching.:)

[@K_Mc]

Hello DetroitGarage ... very informative video about avoiding runaways ... thank you so much ... my '78 DD 6-71N (Marine [serial numbers ID them as 'Industrial']) engines currently have no lube oil in them and have not been run since end of August of 2020 ... as I was in the middle of adding custom-made oil drain hoses to the oil pan drain plug holes when other issues arose. A quick check of pictures I have of my rack tubes shows me that I don't have the individual spring-style rack tubes ... which probably explains why I do have cable-actuated air shutoff valves ... and should follow your pre-start advice once I'm in a position to run these engines again. BTW, I noticed 'Russam Holdings Inc. Vernon, B.C.' emblazoned on the truck cab door nearby the 6V71 engine you were demonstrating with and am wondering how close you are to me in sunny Tsawwassen. Perhaps we can get in touch ( sixoh48ohtoo5too3nine ), as I sorely need DD expertise in order to deal with a fuel system leak (to address 51.56% fuel dilution of my Port eng. lube oil). K Mc

[@detroitgarage9430]

I'm in Kelowna, about 5 hrs from Tsawwassen. I'll give you a call tomorrow evening if that's ok with you?

[@K_Mc]

@@detroitgarage9430 ... sounds good, anytime after 1830 'til 2100 or so works ... thanks, K Mc

[@twohandsles2556]

no such thing as a run away on detroit just the mech. that runs away

[@gordoncorey8023]

Ijiter rod

[@andalousseafoulouse2651]

Motor de andorlaf hiteler 1950

[@detroitgarage9430]

This one happens to be 1958, thanks for watching.:)

[@ernestrhoades5147]

Use a phone book!

[@alanincardona1879]

The best way to not have a runaway with a 2stroke Detroit is to change that oil throwing, noisy' torque less paper weight with something else! I've driven them in big trucks. I was glad when Detroit stopped making them. Not that the New Detroit's are much better.

[@detroitgarage9430]

Not for everyone that's for sure.:) Thanks for watching.:)

[@keith2860]

It smells like communism in here

[@gordoncorey8023]

It's no that hard