Hi all,
I've just purchased an E29 from '71. It's got an Atomic 4 rebuilt in the late 90's that has a heat exchanger for fresh water cooling. The engine just went through an inspection and passed with flying colours. We took it our for our first trip today to move it to our marina but had to turn back after about 20 min. because the engine appeared to be overheating. Temp climbed steadily to over 200 then 220. We would have shut it off as it went over 180 but we were about to enter a narrows and needed to stay off the rocks . We eventually got the sails out and had a good sail back and just fired up the engine for a few minutes to get back into the slip. Engine still sounded good. Raw water seemed to be moving fine, strainer was full and active looking, water coming out the back of the boat as expected. The fresh water exchanger (radiator) was full, and I later checked out the impeller and that looked healthy. The former owner thought it could be the temperature sending line being too close to the exhaust (something that came up during the survey). The line is insulated from the front of the engine but becomes bare as it passes through the bulkhead over the wrapped exhaust pipe.
My question is: Should I insulate the line in this section (what with) and possibly suspend it from the top of the opening to keep it off the exhaust? Also, any other thoughts on heat issue?
I've just purchased an E29 from '71. It's got an Atomic 4 rebuilt in the late 90's that has a heat exchanger for fresh water cooling. The engine just went through an inspection and passed with flying colours. We took it our for our first trip today to move it to our marina but had to turn back after about 20 min. because the engine appeared to be overheating. Temp climbed steadily to over 200 then 220. We would have shut it off as it went over 180 but we were about to enter a narrows and needed to stay off the rocks . We eventually got the sails out and had a good sail back and just fired up the engine for a few minutes to get back into the slip. Engine still sounded good. Raw water seemed to be moving fine, strainer was full and active looking, water coming out the back of the boat as expected. The fresh water exchanger (radiator) was full, and I later checked out the impeller and that looked healthy. The former owner thought it could be the temperature sending line being too close to the exhaust (something that came up during the survey). The line is insulated from the front of the engine but becomes bare as it passes through the bulkhead over the wrapped exhaust pipe.
My question is: Should I insulate the line in this section (what with) and possibly suspend it from the top of the opening to keep it off the exhaust? Also, any other thoughts on heat issue?