Low hours on Yanmar 2QM20
I am starting a new thread here from the discussion on buying a new boat. One concern several of you had was very low hours regarding the Yanmar 2QM20, on a 1978 Bristo 29.9 . The Meter reads 656 and is believed true. Motor is the original as far as I understand.
My question is how can this be bad for the engine? Potential corrosion of the rings and heads? Just curious as I have never owned a boat with a diesel. And I know I would put at least 2 hours a week on this engine during the season here in Chicago, if i decide to buy the boat. Also anything I should known about this particular engine both good and bad? For istance is this an 18HP or 20HP the PO claims it is 20HP from what I can find it is 18HP?