Quote:
Originally Posted by Ivanerrol
Coming from the valve cover?  |
No, I meant in general coming out the tail pipe because that is where you normally see any signs of worn valve seals or stems. If you get any pressure coming out of the valve cover vent, then that means you're getting blowby gases -combustion gases that are getting past the piston rings, and are blown into the crankcase. I doubt worn valve seals could produce that as the valves are obviously seated during the combustion phase.
In an engine with blowby, a compression test should shed some light on the condition of the cylinders.