My grandfather owns a 2001 F-250 with the 7.3 powerstroke diesel engine, obviously. I am not too familiar with diesels and just wanted some knowledgable input. My first question is that; recently I have discovered oil residue areound the area of the y pipe. I am speaking of the pipe that directly exits the turbo compressor and the pipe that runs to the intercooler. It looks as tho oil has been sprayed around where the first coupler is. I thought possibly it was bad turbo seals so i popped off the coupler and found oil inside the pipes. Then to make myself feel stupid after reasembly I noticed the coupler said '' this pipe contains oil residue.'' Now normally this is a bad sign on a turbo motor. Is it different for this one? Also i noticed there is no bypass valve on this setup. This seems like a design flaw. Where is the pressure supposed to be vented when you suddenly snap off the throttle. BTW, the truck is an automatic.


Cliff's
1. Oil around y pipe where turbo compressor exits. Where could oil be coming from?
2. Is it normal for the oil to be in the IC pipes?'
3. Why is there no bypass valve?

Sorry for the long first post, and please go easy on me. Your input will be greatly appreciated.

Nick

 

1. Ford saw fit to route the crank case vent into the intake - so that is where all the oil film comes from.

2. Yes - if you don't like - read up on the CCV mod. Re-routes the vent to the outside instead of into the intake.

3. Diesels don't need any such thing. There is no throttle plate for the pressure to get jammed up against when you let off the go pedal real quick like on a gasser. There is nothing to limit air intake into the motor - which is why a diesel motor does not hold itself back as well as a gasser, like when you downshift.