increased compression

[tonypalmer]

recently I have had increased compression on my Yanmar 1GM10 - so much now that I can hardly turn by hand without releasing compression. Runs as smoothly (!) as ever and power the same as ever (!).

possible headgasket and/or water from inlet? any other suggestions?

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[snowleopard]

if it's happened without taking the head off there aren't many things it could be. my guess would be that sticking piston rings have come free, perhaps as a result of different oil. valve seats could also be involved.

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[steve28]

Thats the way it should be , like snowleopard has said must be because the oil is better or a ring has freed itself.
How many hours has the engine run ?
How old is it ?




Always use mineral oil.
NOT SYNTHETIC or SEMI SYNTHETIC

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