How can i diagnose a pressurised engine crankcase?
Answers:
A pressurised crankcase results from blow by past the piston rings, caused by worn pistons, rings and cylinder bore wear and usually results in oil blowing out of breather pipes and oil leaks from the engine, It is unlikely to have anything to do with a cracked air filter housing.
Oil burning and crankcase pressurisation usually go together as both can be caused by cylinder/piston/ring wear.
The cracked air filter is less likely to be the cause than it is to be another symptom of the problem. Sounds like this car is loosing compression via the rings or valve stem oil seals, pressurising the crankcase and burning oil. The precise diagnosis is a matter of elimination. 1st remove the crankcase ventilation tube from the top of the rocker cover to the air filter. Plug the hole in the rocker cover with your finger while the engine is running. A healthy engine will produce no pressure here at all, hold your finger there for a few seconds and release, look at how much fumes come out and if there is a continual blow out. After this you have confirmed that you have either a choked PCV (positive crankcase ventilation valve) or a knackered engine.
worn pistons or piston rings would cause blowby,burning oil,pressurising the crankcase,nothing else.so you need an engine rebuild,sorry mate!
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