Originally Posted by
phil_focus
both fucked valves and fucked rings would cause it to smoke as you wont get compression so you wont be buring the fuel and it'll prob be leaking oil into the cyledar and then all that gets shoved out the exhaust and ignited by the other 3 cylenders.
i'm afraid its a head off job now to find the cause of the problem
Surely a knackered valve wouldn't
cause smoke? Just allow more to get out of its cylinder?
I'd have thought a knackered valve would cause low compression on one cylinder.
And if oil's been poured into the bores, surely that would smoke more as it's burned off? Just asking as I have only a simplistic understanding of such things.
When were the valve stem seals changed? Oil will be happy to run down the valve stems into the cylinder if the seals are shot.