The 1987 Yanmar
2GM20F in my Pearson31 burns 8 ounces of oil
(240 ml) per 8 hours run time. It also makes a very loud tapping noise
when first started. I bring the revs up to 1000 rpm
as soon as it starts, and the tapping goes away, I presume because the higher revs get the oil
circulating. Once warmed up and running at about 2100 rpm
, I can see some smoke coming out the exhaust
, if I look closely.
I know I should be running her at 2600-2800 rpm, but 2100 seems to be the sweet spot, and I donít want to push it considering the previously stated issues. And at higher revs, the boat tends to vibrate more than Iíd like.
Is burning oil, in and of itself, an issue? She starts right up, and makes about 4.3 knots at 2100rpm.
Is the burning of oil related to the tapping?
First boat, first diesel
, and not sure what to do?