I have a 1982 boat with a late model A4, FWC, Vetus Aqualift muffler. Running at 1000 RPM the temp is 185. At 1500 RPM the temp goes to 195, and the Temp light goes on. It’s the same problem I had back in August and I’ve done a lot to fix it, but it’s still a problem. I made it to an anchorage for the night and posting this using my phone.
Back in August it was running hot. Finally I noticed the bilge pump light running and no cooling water coming out the back. I checked the engine compartment and found water gushing out the side of the engine block. After being towed home, I replaced the very rusty side plate with a new one from Moyer, and manually removed a large quantity of gunk filling up the water jacket. I reassembled everything including a new impeller and shaft. The hoses are one year old and the exhaust manifold was ultrasonically cleaned a year ago. I tested the thermostat in a pot of water on the stove and confirmed it cracks open at 165 and is fully open at 175 degrees. I ran the engine at idle for 45 minutes before setting out and it held at about 175 to 180. We noticed that there is less water coming out the back than before the problem and the engine sounds louder. What could it be? Clogged muffler? Thermostat?
Back in August it was running hot. Finally I noticed the bilge pump light running and no cooling water coming out the back. I checked the engine compartment and found water gushing out the side of the engine block. After being towed home, I replaced the very rusty side plate with a new one from Moyer, and manually removed a large quantity of gunk filling up the water jacket. I reassembled everything including a new impeller and shaft. The hoses are one year old and the exhaust manifold was ultrasonically cleaned a year ago. I tested the thermostat in a pot of water on the stove and confirmed it cracks open at 165 and is fully open at 175 degrees. I ran the engine at idle for 45 minutes before setting out and it held at about 175 to 180. We noticed that there is less water coming out the back than before the problem and the engine sounds louder. What could it be? Clogged muffler? Thermostat?
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