I've been having overheating
problems with my W58. She'll run fine for 20 minutes then the temp quickly goes over 200. I've cleaned and or replaced all units in the fresh water cooling
system. The raw water
system works fine with plenty of output.
I noticed bubbles coming into the coolant
reservoir and used a test kit to see if the bubbles were exhaust
oriented. They were. This makes be believe that I have exhaust
bubbles coming from a blown head gasket
and blocking the coolant
flow, thus the overheating
I used the engine
briefly to get off the dock
when I had to, but now the engine
barely cranks. The battery
is fine. If I try to crank the engine, wait a half hour, try to crank again, let it set and try one more time, the engine turns over enough to fire and run. I tried this intermittent approach to keep the starter from overheating and it worked.
My theory is that the coolant drains back into the cylinder through the head gasket
hole and, since water
won't compress, keeps the engine from fully turning over. Trying to crank intermittently slowly applies pressure in the cylinder and forces the coolant back out of the head gasket hole, thus letting the engine turn over.
If my theory is correct, it confirms the head gasket problem and I'm getting the tools out to replace it. Does my theory "hold water"?