I've removed the crankcase breather vent and the tube, and neither was clogged. I ran a lighted mirror and my fingers along the line running from behind the starter to the main bearings, and it is not leaking oil
. I found a slight leak from the stern-most, port-side corner of the oil
pan and tightened the bolts about 1/8th, and that leak seems to have stopped.
But unfortunately, I still have an oil leak
. It runs down the back of the engine
block and seems to be coming from somewhere up inside where the block attaches to the flywheel housing.
So, my question is: Should I do a compression
test to indicate whether the rings are shot and then, if they are, should I assume that all seals
and gaskets are fine and that the air being pumped into the lubrication system is forcing oil out through perfectly good seals
, or should I go straight to replacing the seals (which is gonna get ugly)?