What does bad lubrication oil look like? sam :-)
If it is cranking at the usual speed, then the
compression might be off a bit in one of the cylinders. This can happen if one
of the piston rings has got stuck over the winter. I would warm up the engine
good and hot and then take for a run. Run it fairly hard for a couple of
hours so long as everything appears to be ok. That should get the carbon out, if
there is any, and it might loosen up a seized ring.
Black smoke is a sign of a rich mix, but it means
little if you have just started the engine after a period of cranking it for a
while.
If you did not change the oil last fall, then now
is the time to change it. I don't know why, but I have found that lubricating
oil sitting for a while in diesel engines is more likely to go bad than in
gasoline engines. Maybe it is climate dependent, but that has been my
experience limited though that may be.
Steve Thomas
C&C27 MKIII
Port Stanley, ON
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