Positive Crank Case Pressure

[mcandmar]

Curious to hear your thoughts on this. It started very suddenly when out for a drive. First symptom was lots of blue smoke out of the exhaust when sitting at traffic lights, then after further investigation i found my catch tank was being filled with engine oil very quickly. As in its dumping a pint of oil into in within 10-15minutes of driving. Then there is the high crankcase pressure, which explains it puking out the engine oil into the catch tank.

I suspect it has broken a piston ring as i cant see what else could do this, but curious to hear other suggestions before i take the bottom end apart.

[S2central.net]

Mark - thats mad - never seen that before - quite funny to watch, but not if its your own motor. All you can do first is a compression test I suppose - that will tell you if any piston rings have cracked. Could be nasty if you damage any crankshaft seals as a result of excessive crankcase pressure - unless your catch can pipework is blocked with some gunje ?

[mcandmar]

Yeah pretty much resigned myself to the fact its pooched and took the car off the road. Need to get my compression tester back from David to investigate further, his motor did not sound healthy either last time i seen him

[SteveH]

Check your PCV system isn't blocked somewhere. Never seen pressure like that in the valve cover!

[macspring]

Will drop it over tomorrow.

[A80Avant]

Interesting to see what it is. My bet it's to do with piston rings as well or cylinder walls being ovalled

[_ShurikeN]

I had an issue with huge oil smoke amount when this happened:

[LSG]

Nice ! What`s the bore like ?

[Error404]

Yer time for a leak down test me thinks

[newsh]

If you’ve still got the stock PCV system I’d be checking the one-way valve under the inlet manifold. It might be broken or stuck open.

[popdemonic]

it just got no vacuum from the intake manifold to create a vacuum for positive crankcase pressure.checking the hose and one way valve(greyish/black) under your throttle.

[newsh]

When my one way valve went bad it blew the cam cover gasket out