Engine/Transmission (1994 - 1998) turbo issue

[Nyoest]

The Chinese eBay turbo does NOT help the trouble shooting procedure. The comp pressures aren't unreasonable. Not great but it should run allright.

There is a basic engine/fuel problem even with the turbo removed it smoked and sputtered.

 

[Nyoest]

The original turbo was replaced bc of oil on the hot side. That could have just as easily come from the engine and not the turbo.

When the pressure line is hooked to the turbo I'm sure the tolerences in the housing slow the flow down some so as not to exceed the drain pipe.

Cap the oil supply line remove the exhaust manifold and start the truck. The offending cylinder/s will be smoking. From there you can concentrate your focus on the actual problem cylinder/s.

Course I'm about a six pack in so what the F do I know.

 

[HHhuntitall]

Course I'm about a six pack in so what the F do I know.

Obviously, more than I do... ... I'm just downing water trying to recover from another 105* day... ... you, obviously, know how to relax!! :-laf

 

[Nyoest]

Obviously, more than I do... ... I'm just downing water trying to recover from another 105* day... ... you, obviously, know how to relax!! :-laf

Even a blind sow can find an acorn once in a while. Talked with my buddy at ft worth today and he said it was 109 at his place. I'll take the snow over that stuff any day!

 

[servicewriter]

ok , oil supply to the turbo at 60 psi should just flow thru and run down the return to block , i looked in book and they said oil psi at housing is 60/65 psi and that is where the supply to turbo comes from , it also says when over 65 psi rlieve kicks in and it dumps of . i removed relief valve in housing , seems fine clean appears ok ? im confused on why with the turbo off, and the drain from turbo to block start pushing the oil up , about ten minutes of run time on warm engine , the oil tube is not restricted . there also seems to be no blow by , like i said i ran it with the oil cap off and dip stick out , cant feel and pressure at either and i see nothing at the tube from the crank breather ? but what i did see was the tube start to fill up and start causing the oil to come out drain tube with the supply line in the tube. ? and that would be why the turbos would fail , they are being jammned up with oil or clogging or back flow ? why ?

 

[HHhuntitall]

That drain tube has to be partially blocked..... it's the only way it can back up in the turbo..... It dumps straight into the oil pan, so pull it off and check the rubber connector hose where it goes into the block, maybe the rubber is deteriorating inside and partially blocking the drain tube.

 

[hsmith]

Yes, I'm thinking maybe the rubber inner lining is colapsing, restricting flow. I would take it completely off and inspect it.

 

[servicewriter]

oh trust me its been triple checked , claer as hell !! its like new and not the problem , drain restriction is definately an issue , that why im asking what else could be the problem . and why im doing all these other tests . i cant figure it out .

 

[servicewriter]

my compression test is as follows 280, 237,265,254,242,247. and i did a leak down test , the max psi i could test with was 150 psi , 0 no leakage . like i said running the truck with turbo off supply tube in drain tube , warm motor it pushes out the drain tube and why turbos are dumping oil in on cold side and hot side . giving the impression turbo is bad . aslo the oil cap off and dip stick pulled out i cant feel any blow by >? I m lost and putting it back together , and keep doing test s !!!!

 

[JKosten]

Side question: Fid your truck have an HX40 when you bought it or are you upgrading to it?

 

[JesseGray]

Side question: Fid your truck have an HX40 when you bought it or are you upgrading to it?

No, it was equipped with a stock turbo when I purchased it used five years ago. I upgraded then to an HX35 from High Tech Turbo. I had questioned the difference between the HX 35 and the HX 40, and I was told by numerous that yes the HX 40 would reduce the exhaust restriction, but since I am a fulltime RVer pulling a 14K pound fifth wheel I positively have to have an exhaust brake due to the lack of natural compression braking.



I hope that answers your question.

 

[servicewriter]

it was all stock , hx35 orginal turbo. i had 4 inch exhaust . when i had seen the oil out the hot side i decided to upgrade to the hx40 and i bought the second gen down tube of the trubo to fit to my 4inch exhaust , because the hx35 has 3inch out let, the hx 40 has 4inch outlet . other wise everything was the same , supply,return to block intake (cold side ).

 

[Mhannink]

servicewriter have you run the engine with the turbo off and looked at the cylinders? i dont know who said it but i think they are on to something. the oil may not be from the seals failing. is there any oil in the exhaust manifold pre trubo?

 

[servicewriter]

yes i did the last test was , truck running no turbo on supply oil directly into drain tube . manifold had no signs of oil before start up and idles perfect and runs smooth , has 1800 rpm /2000 rpm flutter or miss and i see smoke out exhaust manifiold slight white and blue , then back to idle i noticed drian tube backing up oil and and i pulled supply oil line up and that when i realized why the new turbo's where leaking . the oil drain tube is fre and clear , but somehow the oil is backing up and clogging up in the turbo causing the oil to leak out seals ? likei said lost !!!

 

[GOlsen]

Mind boggling. I know you keep saying that the drain tube is clear. How did you check this? Is it possible that you're getting some flow through it, but not enough. Like sludge buildup or something similar inside of the tube.

 

[servicewriter]

i have taken it off , many times its perfectly clear . the only thing that i can think that even be close to possible of a prblem is when i put the hx40 turbo on i had to cut the down tube and take a small tube section out because of the angle . but remeber with the supply tube directtly in it its almost strait down , i was wondering if i have to much and to high supply pressure and it cant keep up ? i cantacted the turbo supplier they said the turbo doesnt have to to regulated by pressure , the tube is clear and dont sem to have bad compression and leak down seems ok !!!

 

[Nyoest]

yes i did the last test was , truck running no turbo on supply oil directly into drain tube . manifold had no signs of oil before start up and idles perfect and runs smooth , has 1800 rpm /2000 rpm flutter or miss and i see smoke out exhaust manifiold slight white and blue , then back to idle i noticed drian tube backing up oil and and i pulled supply oil line up and that when i realized why the new turbo's where leaking . the oil drain tube is fre and clear , but somehow the oil is backing up and clogging up in the turbo causing the oil to leak out seals ? likei said lost !!!

You need to CAP the oil supply.



The smoke is your problem, not the return. You've checked the return and told us it was clear. If that is true it cannot be the problem.



That oil pump can jack crazy oil out at 2,000 rpm and the engine returning to idle can cause weird turbulence in the oil pan causing the tube to fill up

And over flow. I'm sure any of us could repeat the same spill with our trucks set up in a similar manner.

 

[servicewriter]

ok thank you , so im having a issue most likey in the fuel side causing my frustration > i cap the oil supply to the turbo, run the truck with turbo off and try to figure where the problem is ? could it be an injector, isnt it possible ? how would i test to find out what problem is in the fuel system , what kind of tests ? I guess the failures could be , injection pump , injecter, fuel preheater, return valve , one of these ? can you tell me how to test any of these ? i have the truck still dissabled , injectors are still on bench trying to determine next step .

 

[Nyoest]

First take a deep breath.



You can assume nothing, only verify and test. Not beating up on you but if you had followed the sequence I had first laid out It would have saved time and frustration.



Take the injectors to a pump shop and have them tested while they Are out. This will remove one more variable from the equation. Then install them and run the engine without the turbo and with the turbo supply capped.



Run the truck at fast idle for a good while and see if there is an oil trail starting to sneak down and out the exhaust manifold.



Have fun!

 

[servicewriter]

recieved the injectors back from injection shop , they found nothing wrong . installed warmed up truck, ran at high idle after warmed up 2000 rpm for 5 minutes, truck had no slobber of oil off any kind , light blue smoke and very rich diesel smell of which unburned fuel and stumble after 2200 rpm and really nasty smoke and fuel . i let back to idle for 2 minutes or so , noticed the oil drain tube to block ( return oil from turbo) had oil splashing at the rim . put finger in tube for 1 minute holding blocking pressure and it is creating pressure in the crank , when i removed my finger obvious pressure , i must have scored a piston ? i guess the next step remove head ?