S400 Bit the dust tonite

[durallymax]

Pulled tonite at a brush pull and my turbo decided to give up on me. However i didnt know it. I figured that out when i got home to the shop and kept hearing a clanking/chirping noise. I thought maybe the oil pump did something weird because right at the end of my hook after the truck snuffed, i got a low oil pressure warning and saw i barely had any psi.

I looked for leaks but didnt see any and so I looked to see if I had oil and it was mostly fuel in the crankcase. Then after i shut the truck off we heard a claking screaching that slowly slowed down. Took off the intake to find my turbo in not so good condition.



Balance rates are all perfect and all the seals inside the valvecovers were replaced to prevent fuel leaks. But it must be leaking in there somewhere.

No clue why the turbo went. Im only pushing about 50psi on it maybe. Its a pretty conservative tune. Too worried about bending my rods again.

Heres a vid. You can hear it right before i downshift.

[YOUTUBE]abpuFWkvYig[/YOUTUBE]

 

[ripmf666]

Ouch sorry to see

 

[specialagentPK]

Sorry to hear that. Hope you get up and running soon mine has been down for 3 months with a broken turbo.

 

[durallymax]

mine probably will be too

 

[super diesel]

That $ucks man. Had the same thing happen with a A5 in the past. What size S400, and how long has it be running on the truck (miles)? Is your oil feed for it coming from the stock location or from a side port? Your oil problem maybe a shot center section bearing in the turbo. Lucky it didn't shoot oil in to the intake for a runaway situation and must have sent it all down the oil drain tube. However, if it's hooked up to the stock location, it would have a hard time dumping this much oil because of the limited size of the cam hole port.

 

[durallymax]

S472 1.00 A/R

I have an air shutoff to prevent runaways. Everybody said you dont need it blah blah but this is the reason i have it.

The oil comes off the stock location. The blue smoke at the end wasnt normal So it must have been leaking some oil in there somehow but idk how it wouldve without running away.

 

[super diesel]

It must have been only a small quantity leaking by (luckly). The air shut off is a great item to have, and one day (forbid) it may save it if the oil blow by is bad enough.

 

[White Duramax]

Your turbo probably went from having fuel in the oil and being diluted. How much overfull is it?

 

[durallymax]

Your turbo probably went from having fuel in the oil and being diluted. How much overfull is it?

This may have something to do with it.

Im not sure when i lost oil pressure but never got the warning till after the turbo went.

If i lost oil pressure before it went then that is the culprit.

Im pulling things apart and putting it all back together slowly the way i want it put back together and finding ways to make it easier to pull the motor the next time (since this is my 3rd time this year).

Ill slowly get a bunch of things fixed and then go drag racing a time or two this fall.

 

[z79outlaw]

This may have something to do with it.

Im not sure when i lost oil pressure but never got the warning till after the turbo went.

If i lost oil pressure before it went then that is the culprit.

Im pulling things apart and putting it all back together slowly the way i want it put back together and finding ways to make it easier to pull the motor the next time (since this is my 3rd time this year).

Ill slowly get a bunch of things fixed and then go drag racing a time or two this fall.

Good luck on getting it back together, if your gunna run it is $20 Wednesdays at Union Grove, give me a shout if you run it this fall, see if we cant get a bunch of D-maxes out there one night.

 

[ecc_33]

I would say fuel in oil didn't help any but wonder if the stock oil line location had ill effects on the center section too? I know sting said his turbo is in good shape with the stock oil feed line

 

[Gmclbz]

I would say fuel in oil didn't help any but wonder if the stock oil line location had ill effects on the center section too? I know sting said his turbo is in good shape with the stock oil feed line

Is there any known harmful effects of using the stock feed?

 

[ecc_33]

I don't have proof of anything. Few claim it wipes turbos becuase of lack of oil

 

[durallymax]

Ive only heard ATS claim that. One company isnt going to convince me. Turbos dont need a garden hose of oil.

 

[durallymax]

Good luck on getting it back together, if your gunna run it is $20 Wednesdays at Union Grove, give me a shout if you run it this fall, see if we cant get a bunch of D-maxes out there one night.

Ya ill be going down again not sure if itll be a wednesday. Theres a few guys up here with cummins and Dmaxes that wanna go race.

Not sure when ill make it down though probably not before october. Ive got the trans and motor out sitting on their stands and ill be going through the trans a freshening it up and cleaning up the motor and fixing some things on it that have been broke all season.

 

[ecc_33]

Sorry off topic but what kind of fueling? Just dual cp3's and stock injector's I assume?
....It was whinning pretty damn good when you were in 4th gear. Sorry bout the bad luck

 

[durallymax]

Sorry off topic but what kind of fueling? Just dual cp3's and stock injector's I assume?
....It was whinning pretty damn good when you were in 4th gear. Sorry bout the bad luck

Twin CP3s, S472 and my tuning on a stock motor?? Never gonna happen. I swore i wouldnt put them on till the motor was built. Heck i bent the rods with just the turbo.

Its a single stocker with a modded FPR and rear cover

 

[ecc_33]

I got a S475 Dual modded cp3's and stock motor? Sorry about the shitty luck man.

 

[specialagentPK]

Is there any known harmful effects of using the stock feed?

If the camshaft bearing spins on the stock oil feed which it is known to do, poof there goes the oil supply. My oil feed comes off the oil filter housing so I am guaranteed to never lose oil supply unless the entire system loses oil pressure.

 

[JOHNBOY]

If the camshaft bearing spins on the stock oil feed which it is known to do, poof there goes the oil supply. My oil feed comes off the oil filter housing so I am guaranteed to never lose oil supply unless the entire system loses oil pressure.

Cam bearing failure is my guess to. Turbo was most likely the victim, not the cause. You can remove the feed line and look down the hole to see of you can see the feed groove in the bearing.

Twin CP3s, S472 and my tuning on a stock motor?? Never gonna happen. I swore i wouldnt put them on till the motor was built. Heck i bent the rods with just the turbo.

Its a single stocker with a modded FPR and rear cover

If you keep trying to run 4th gear and bog it down below 3000rpm like that, bent stock rods are going to be the norm. To keep them striaght you need to keep as far a way from peak torque as you can. If you want to keep hanging 4th rods should be on your short list.