I have an '88 760 turbo wagon with 154k on it. I'm seeing some residue or foamy looking gunk on the dip stick. I do notice that the crank case seems to have more pressure than normal when I open the oil fill cap. I replaced the fill cap gasket a couple days ago because of the oil coming out of the cap. I had the crank case ventilation device replaced a couple years ago. The gunk on the dip stick seemed to start soon after I had the turbo rebuilt which was about 20K ago but after that much mileage and the 6 oil changes since, all the junk from the rebuild should be flushed out. The engine runs strong but consumes about 1.5 quarts between 3K oil changes. Any ideas on the dip stick gunk & crankcase pressure ?
Thanks.

For the pressure, you should definitely go ahead and clean out your flame trap. Not too hard to do, and it should be done periodically.

As for the gunk, what color is it? The only time I ever saw gunk on my dipstick was when coolant was leaking into the oil because of a blown headgasket. Any oil in your coolant?

Greg

The residue is dark brown. No oil in the coolant. Where is the flame trap and how do you clean it? From a couple posts I read, the turbo doesn't have one.
Thanks very much for your response.

Dark brown? I don't really know. Are you overfilling the engine oil?

As Kenric has pointed out, there is not actually a flame trap in your PCV system, but the rest of the PCV system is there, on top of a black plastic box that sits on the side of the block under the intake manifold. As he suggests, take a look at the FAQ for more info. The system does need to be cleaned out periodically, and that is what I meant by the flame trap.

Greg

the turbo doesn't have one, but you still have the PCV fixture as well as the oil trap located below that can get clogged. check the FAQ for the procedure.
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Kenric Tam
1990 Volvo 740 base sedan (B230F)
My Volvo 'Project'