Thank you for the replies.weve considered most of what's been noted here. The fresh water coolant/ tank was empty., we have been thru the boat closely looking for evidence of a flooded interior
, nothing noted, except for the bilge are and the engine compartment.
We are thinking freshwater entered the cabin
, filled the low areas of the boat, and possibly entered via the crank case dip stick reciprocal.
We've considered the coolant system. With zero anti freeze in the cooler, and only fresh water. The boat was in Santa Cruz
for several years, we even considered possible damage from the tsunami in Japan
. That would be salt water
The boat is a really clean boat, was missing the boom,a servey, noted a hard jibe, causing the loss of the boom and main sail. I don't buy that non sense, and the motor had water in it. A new main sail, and an aftermarket boom fixed that problem, and we're slowly working on identifying the motor issue.
I've got to plastiguage the rod end caps in the morning. If they measure properly we start buttoning the motor up, with TLC, and a keen eye for anything that needs replaced or cleaned.
So IF the water was to have come from the heat exchanger/ radiation, what would be the likely path from the exchanger into the crank case? I can't see how ?, for the fresh water to get their minus a head gasket, or a cracked block, or maybe a cracked head. Again no physical signs of any of these three avenues.
Although we are not intending a NDI " non destructive inspection" of the head or the block, due to costs, well put it back together, fire it up, let it run for an hour, or so, drain the oil change
the filters again and probably drop the pan again for another look.
Last question sorry to be so long winded. I'd like to get away from the existing air cleaner. I'd like to go to a K & N style, cleaner, with the intent of providing better air flow, for better optimal engine use.
Any thoughts on the after market air cleaner, pro/ con.
Thank you in advance for,your help. I'm greatful, I have zero experience on the 4-108m.