I have a 89 chevy 6.2L diesel with a Banks turbo that is blowing oil out
the dip stick spout when I make it work hard, over 2 lbs of boost. When I
remove the oil filler cap there seems to be a lot of blow by but the
engine is still strong. I'm going to do a compression test, what should
the compression be? I suspect a bad head gasket. What else might it be?
I had an '85 pickup that I put the Banks turbo kit on. If it's building
excessive crankcase pressure under boost, it could be the intake valve
guides. Nate's advice to do a leakdown test is where to start. If the
rings aren't bad, I'd take a look at the guide to stem clearance on the
intakes. That's a very reliable engine in my opinion. I put better than
160,000 miles on mine after the turbo install and I had the fuel delivery
turned up for more power. Then my son totaled the truck.
Hope this helps.
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