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  Topic Review (Newest First)
11-23-2009 08:45 AM
aa3jy What page in the Service Manual can the compression values be found? Must be missing something..can't seem to find them...
11-20-2009 06:10 AM
Shortman 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.
11-19-2009 06:56 PM
dmtjoy It also makes a differance on wether the engine is warm.
11-18-2009 06:32 PM
imagine2frolic Was that done dry in the cylinders?........i2f
11-18-2009 12:37 PM
sck5 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)
11-18-2009 12:24 PM
aa3jy Thanks,

Had values of 300, 300 and I quess those are considered low. Sounds like time for a a refit...Arrrrggggg
11-18-2009 10:04 AM
badsanta I dont have the book with me But I think it was in the 425-485 psi range.
11-18-2009 05:11 AM
Yanmar 3GM30F

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

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