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oil everywhere breather problem?

I was driving along and things did not sound right to begin with, then I smelt burning and pulled over in a layby in time to see smoke coming through the vents.

There was oil everywhere, it seems to have come from the filler vent. The only other thing visibly ammiss was that the air cleaner hose had come off the top of the carburettor.

Is it possible that a lack of vacuum on the crancase vent on the rocker cover, caused by the air hose being adrift could have caused the valve to stay shut causing a build up of back pressure with no where to vent but the filler ?

Engine seems to be running fine, so is there any other cause of a sudden oil pressure build up anyone can think of.

Reply to
Larry
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There should be no significant vacuum in the hose between the aircleaner and the carburetter, so this should make no difference. The usual reason for the symptoms you describe are excessive blowby past the rings. Depending on how long the engine has been breathing unfiltered air and the conditions, this can cause rapid ring and bore wear. In very dusty conditions terminal damage can be done in a few minutes, so even in not very dusty conditions if the air has been unfiltered for some time this could be the problem. The engine could still run fine, although it would be down on power. A compression test would seem to be indicated. On the other hand, the hose off the carby could be unrelated, and you could have damaged or stuck rings, although these usually happen on one piston only and lead to rough running. JD

Reply to
JD

Everything is fine this morning, no smoking, no evidence of excessive pressure.

Got a new rubber to fix the air cleaner hose though so it don't come off again.

Reply to
Larry

Spoke too soon, it is still blowing oil out of the breather when I drive it hard :(

More expence.

Reply to
Larry

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