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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel > Yanmar 3GM30F
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Diesel This is a forum dedicated to diesel engines and their applicable accessories.


Thread: Yanmar 3GM30F Reply to Thread
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Topic Review (Newest First)
11-23-2009 09:45 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 07:10 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 07:56 PM
dmtjoy It also makes a differance on wether the engine is warm.
11-18-2009 07:32 PM
imagine2frolic Was that done dry in the cylinders?........i2f
11-18-2009 01:37 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 01:24 PM
aa3jy Thanks,

Had values of 300, 300 and 250..so I quess those are considered low. Sounds like time for a a refit...Arrrrggggg
11-18-2009 11:04 AM
badsanta I dont have the book with me But I think it was in the 425-485 psi range.
11-18-2009 06:11 AM
aa3jy
Yanmar 3GM30F

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

 
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