Deuce turbo issues

[gimpyrobb]

One of our members has had 2 different "c" turbos on his truck. The first one made a goofy noise at higher egt/rpms. It went from a whistle to a sound similar to a dremel tool. After a couple months he took it off and found the bearings were shot. He got another "c" turbo from ebay and now its making the same noises.

The truck originally had a "d" turbo, not sure how long that one was on the truck before he went to the whistlers. From what I could tell the egts he runs is around 1200*. I haven't run any whistlers to know if the heat kills them. I know I run my d turbo close to 1200 often and have no issues.

I was wondering what you guys think. I wondered if the turbos oil supply was a possibility, but don't know what volume/psi its supposed to have or how to test it.

Anyone have any similar issues?

 

[SCSG-G4]

Let him keep killing "C" turbos! Maybe that's why Uncle went to the "D" model.

 

[Davis Welding]

I would have a look at the oil supply and make sure it is flowing as it should. The TM may have specs on pressure at the turbo. I'll help you look for that. Switching back to the "D" turbo would be advantageous for him!! OR upgrade to a Garrett HX35(?) I can't remember exactly what Garrett turbo was being used as aftermarket upgrades on the MF

 

[gimpyrobb]

Nah, he likes the sound of the C turbo, so I figured I'd try to help him figure out what is going on. Its either gotta be the heat(egt) or oil supply.

 

[Flyingvan911]

My guess would be oil also.

 

[teletech]

Almost sure it's oil supply, unless he's not idling down after a run?
Verify pressure and flow with a gauge and valve (valve closed for pressure, open valve a bit to see how much flow and pressure drop you see) in case there as some restriction in the supply or return line, I've seen both kinked and coked-up lines in civvy applications as well as gaskets installed improperly or too much sealant used blocking a line.
DYI turbo bearing replacement isn't hard and starting with known fresh bearings should help.

 

[mobileauto2000]

My truck sits on 1200 EGTs a lot and I have had no turbo trouble

 

[gimpyrobb]

My truck sits on 1200 EGTs a lot and I have had no turbo trouble

Which turbo you running?

 

[Davis Welding]

Nah, he likes the sound of the C turbo, so I figured I'd try to help him figure out what is going on. Its either gotta be the heat(egt) or oil supply.

I can understand that. The noise is the only reason I own a C-turbo MF! Haha. I'd look at the oil supply. Also look at his habits.....does he start it up and go straight to throttle? When he stops, does he let it set and cool be fore shutting it off? That's one of the fastest and easiest way to kill a turbo. How does the truck run otherwise? High EGTs can be a sign of fueling issues too. There is a lot to keeping a turbo happy! Oil being one of the biggest!

 

[mobileauto2000]

Which turbo you running?

C turbo with muffler

 

[brianp454]

I have a C turbo with AE3535XL muffler and run EGT's up to 1150 or so routinely on grades in 4th or 5th. These turbos (C, D , or whatever) should be able to handle quite a bit more than that. I'm pretty sure heat is not the issue, yet two failures for the same thing suggests another issue than the turbo itself. I agree with many other the oil feed needs to be checked. I haven't read the TM's on this, but would like to see a flow confirmation rather than only trusting supply pressure, say due to the return line being plugged and limiting flow.

There's also the warmup and shutdown instructions in the TM's, stickers, etc. I always let my truck warm up good before taking off and let EGT's plane back out for at least 2-3 minutes before shutting off. It's easy to do; I just baby it a bit as I get close to where I'm going.

What kind of engine oil does he use? Filters? Frequency of oil changes?

 

[brianp454]

One other thought. My truck has JATonka spin on filters. I've heard that the stock filters can be installed improperly. Is there a chance they are allowing unfiltered oil to pass due to mis-installation, bad filters, or a bypass that is malfunctioning?

 

[rustystud]

Check the turbo supply hose for damage or a restriction internally.

 

[USAFSS-ColdWarrior]

Gotta luv what you can learn about these truck when your sinuses are keeping you up at 0300 hrs.

Thanks, gentlemen.

John

 

[sandcobra164]

My Deuce has found a new home but I also swapped a D for a C. Truck had a new in 1992 Hercules LDT-465. I turned up the fuel quite a bit and used to do heavy haul with it by Deuce standards. Highest weight was 24,000 pounds plus truck so figure 37,000 combined and pulled 13,000 to 21,000 quite a few times behind it. Never had an issue with the turbo and it was a used take off when I got it. It's bearings were tight with no shaft play when I installed it. I did the required procedure when operating the truck. Idle for 5 minutes upon start up and 5 minutes before shutdown. If his sometimes sounds like a dremel tool, I'd be curious about oil supply as well. A friend of mine has a truck with a C turbo and canister style oil filters. Upon start up, his turbo spins pretty fast until the oil pressure builds up. It's quite noticeable but sounds completely normal once oil arrives.

 

[gimpyrobb]

He has swapped back to the D turbo, but here is a video illustrating the turbos sound.

https://www.youtube.com/watch?v=lWkiUHgXKoc&feature=youtu.be

 

[rustystud]

That's bearings alright !

 

[JasonS]

Check the Turbo pressure regulator. It is the same housing as the main pressure regulator on the left side of the block.

There is no "turbo" pressure regulator. The housing on the left side of the block has a relief valve that opens at 40 psi (dumping excess pressure back into the pan) and a valve that opens at 15 psi minimum for the piston cooling nozzles. The turbo is fed off of the same system as the engine bearings, etc.

 

[saddamsnightmare]

January 1st, 2016.

Now I know why my M35A2 had a NA MF Diesel, no turbo issues....... My experience with turbo'd locomotives is you blow the turbo, the locomotive is just about dead until the turbo is replaced, so I suspect your friend is going to make a lot of turbo dealers very, very happy.

Good luck on the repairs.opcorn:

 

[sandcobra164]

The D turbo is good but I'd recommend he find a C7 turbo from someone parting out an LMTV. It has a slight whistle, flange is the same but will need a 4 to 3 inch reducer to mate it to the stock exhaust. After that upgrade, he may want to get ready for headgaskets as the extra air will stress yet another point on the truck while running. On an LMTV, that turbo will produce in the low 30's of boost when installed on a wrecker towing another truck behind it.