Thread: Losing water
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  #8   IP: 104.174.83.118
Old 07-18-2021, 09:15 PM
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ndutton ndutton is offline
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I may have misunderstood so here come the questions:
  1. When you said you pressure tested the water jacket in post #5 I thought you meant the engine water jacket. Now I understand the test was the exhaust pipe water jacket, correct?
  2. Have you pressure tested either of the exhaust manifolds you have?
  3. Have you pressure tested the block?
  4. Have you pressure tested the heat exchanger (HX)?
  5. In post #5 you mentioned checking for kinks in the exhaust system. I'm at a loss to understand how a rigid water jacketed exhaust system gets kinked. Please explain further.
  6. Is there a high loop right before the exhaust thru-hull? Can you provide pictures or a sketch of your exhaust system?
The water jacketed exhaust pipe is typically fed with raw water so it is not involved in your coolant loss. The presence or absence of a thermostat will not cause a coolant loss either but if there is no thermostat you certainly need a way to restrict the bypass (the coolant path from the alternator side of the block to the thermostat housing).
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1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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