Air is leaking into the raw water cooling system.
The raw water cooling
system for a Volvo Penta
MD 11 C that is 32 years old consists of:
hose to a raw water
hose to the engine water pump
I fill the raw water strainer to the top with water. (This raw water strainer is above the waterline while the raw water intake and the engine
are below, or at the water line). I screw the lid on the strainer and use all the sealant
as instructed in the manual. Then I run the engine. After a couple of hours everything looks fine. After 5 hours the water level in the strainer begins to go down. There is about a half inch of air within the top of the strainer. As time goes on there is more air in the strainer. By the time 10-20 hours go by there is half air, half water in the raw water strainer. If I let this go on the cooling system will be sucking all air and the engine heats way up.
What do you think???? There are no visible water leaks
in the hoses, through hulls, or raw water strainer. The system should be a closed water system where a vacuum is in the hose. Question: Can air be sucked into this vacuum system without there being a water leak?????
Where is the air leak coming from? How should I seal that air leak?
Thanks for any suggestions you can give me.
fiddlersgreen-Mazatlan Marina, Sinalo, Mexico