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Old 09-05-2017, 11:04 PM   #14
Edelweiss
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City: PNW
Vessel Model: 1976 Californian Tricabin LRC
Join Date: May 2011
Posts: 1,860
Quote:
Originally Posted by DHeckrotte View Post
Well, ran yesterday for about three hours, no issue, rock steady temperature. Today, overheated after about 45 minutes, and despite shutdown and restart, never cooled down to 'normal'.
Sheesh!
If not the thermostat or collapsed hose and assuming your pump is delivering enough water, it could be a system blockage. Check the hoses between the raw water pump to oil cooler and to heat exchanger. Squeeze them with the engine off, so you know how they feel, then start the engine, run it up a bit and squeeze them again. If they're rock hard or swollen, then you have a blockage down stream from where you're squeezing. Could be anywhere in the circuit all the way to the exhaust elbow. If its not a range 4 engine, you should have a bronze crossover pipe between the heat exchanger and exhaust manifold across the top of the engine above the bellhousing. They get plugged with a build up of sediment over time. Has the exhaust elbow water injection ports been clean recently?
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