After a flight a few days ago I found I big oil leak. After taking off the cowl I found that the silicone holding part of the oil filler in place had come loose and the oil fill cap had come off. Easy I think....
So I fix the oil filler stem but on a ground run there is now oil coming out of the turbo. If I take the oil filler cap off, oil stops coming out of the turbo. So something is pressurizing the crank-case. Engine is running fine otherwise. The crank case vent is not plugged (but is too small to let out large amounts of gas). The oil does not appear to have water in it, so it seems to be either compression or exhaust gas that is getting in.
What causes that? A blown side seal? Busted turbo seal? The turbo still seems to be making good boost. Other ideas?
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