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post #1 of Old 10-06-2009 Thread Starter
seadog47
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yanmar 2GM20F oil burner

I have twin saildrives using the Yanmar 2GM20F engines. They have about 3500 hrs on them and worked fine last season. This year one of them is burning oil. Both engines start about the same. I'm assuming that a diesel won't start well if rings or valves are bad and having two engines side by side it seems I can rule out rings and valves so I' thinking valve stem seals might be the culprit. I took an oil sample but have not sent it out for analysis yet. Does this logic make sense?
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