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aa3jy 11-18-2009 05:11 AM

Yanmar 3GM30F
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What should be the compression values of the Yanmar 3GM30F?

badsanta 11-18-2009 10:04 AM

I dont have the book with me But I think it was in the 425-485 psi range.

aa3jy 11-18-2009 12:24 PM

16 Attachment(s)

Had values of 300, 300 and I quess those are considered low. Sounds like time for a a refit...Arrrrggggg

sck5 11-18-2009 12:37 PM

I have that engine. compression is supposed to be between 390 and 470. You sound low. Also one of them is significantly lower than the other two. Is your valve clearance what its supposed to be? (.2mm)

imagine2frolic 11-18-2009 06:32 PM

Was that done dry in the cylinders?........i2f

dmtjoy 11-19-2009 06:56 PM

It also makes a differance on wether the engine is warm.

Shortman 11-20-2009 06:10 AM

Five years ago my pre-purchase survey for the 1985 3GMF was #1-345, #2-320, #3-380. 320 was considered at the bottom of the range. The engine has run fine (knock on wood) since then. Oil tests come back good.

aa3jy 11-23-2009 08:45 AM

16 Attachment(s)
What page in the Service Manual can the compression values be found? Must be missing something..can't seem to find them...

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