79 bj40, diagnosing an oil burn…looking for input

[bblawless]

Hey everyone.

Recently slapped a turbo on my 79 bj40. It’s a “b” not a “3b”.

Plumbing as follows- supply line directly off the block, return line directly to the side of the oil pan- “5/8” drain hose.

Engine is certainly showing its age, even before the turbo It smoked at startup, but cleared up once warm. Clearly not oil smoke, just classic old diesel smoke on a cold startup.

So my new problem post turbo install- same smoking behaviour on startup, but now I’ve got some new smoke behaviour. Once the truck is warm, I can drive down the road without any obvious smoke until I come to a red light or some traffic. After sitting at a light or in traffic for a bit and accelerate, there is a significant amount of smoke out the tailpipe…stinks like oil…

Looking for input…I already double checked the drain line to ensure it isn’t plugged, and I can’t imagine I have excessive crankcase pressure as the “b” motors have a factory road draft pipe…and from what I can see the blow-by isn’t so bad.

Thoughts?

Cheers eh

 

[duncanrm]

What is the history of the turbo that has gone onto it.. it seems likely thats going to be culprit.

 

[45Dougal]

White smoke at startup and blue smoke at the traffic lights presumably.
Assuming the turbo is new and the oil lines are installed the right way, then I'd be looking next at the valves and the head gasket.
Did you do a compression test before adding the turbo? Maybe try repeating it now.

 

[charliemeyer007]

Not a diesel guy. Old diesel's should be fed a diesel supplement to make up for the ultra low sulfur diesel fuel that you can only buy now. Causes problems with the injector pump without the additive, might affect the injectors too.
Blow by pre-turbo will be less that it will be post turbo by some portion of the about 15-1 compression ratio.

 

[DeskJock]

Adding Turbo to your existing system, at least to me would create more engine stress ( heat, combustion Chamber pressure, etc). You have two variables that you have already addressed 1. sounds like your motor is tired to begin with and 2. new turbo.

Based on at least these two items, in my opinion : Your engine wear will be increased with the turbo.

Do wet and dry compression tests. Consider the importance of the turbo ...

 

[bblawless]

Turbo was used, with no obvious signs of play or excessive wear…but after checking several other things listed above, I will be pulling the turbo to do a rebuild :/

Thanks for the input folks