View single post by chris

Posted: Wed Jul 19th, 2023 03:28 pm

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chris
Wrench spinner

Joined: Thu Oct 5th, 2017

Location: Leigh On Sea

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Just a small amount of oil - maybe a teaspoonful, three teaspoons = 1/2oz - I use a pump oil can to just get the oil round the edge of the piston - too much in there affects the reading - just enough to seal the rings.

Oily piston is usually a sign of poorly sealing piston rings, either broken or stuck in the grooves - if the oil control ring is at fault then oil can be pumped up into the cylinder. The alternative source is worn valve guides allowing oil to be sucked into the inlet tract.

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