C
Chuck Schulz
Guest
" I have a twin CH350 installa
" I have a twin CH350 installation in a 1980 boat. A while back I had a temp problem with both engines which was ultimately traced to plugged heat exchangers. During the diagnosis I replaced the thermostats on both engines. After fixing the heat exchangers both engines run at acceptable temperatures. But, one engine now warms up much faster than the other -- this didn't happen before --, heats up more at idle -- the cooler engine idles at about 135-140 degrees (160 degree thermostats in both) where as the problem child idles at 160-170 degrees --, and runs warmer under load -- 175 degrees verses 165-170 for the cooler engine. The baffling thing is that both engines used to warm up at just about the same rate, ran cool at idle, and ran at just about the same temperature under load. The heat exchangers have been freshly serviced -- both coolant and oil coolers -- , the sea water pumps are low hours with new impellers, and the mixing elbows were replace 3 years ago. I'm about to try a new thermostat in the hot engine. Any opinions on whether I'm on the right track? BTW, I just replaced the circulating pump on the hot engine, it was squeeling -- quiet now, but the temp behavior hasn't changed. "
" I have a twin CH350 installation in a 1980 boat. A while back I had a temp problem with both engines which was ultimately traced to plugged heat exchangers. During the diagnosis I replaced the thermostats on both engines. After fixing the heat exchangers both engines run at acceptable temperatures. But, one engine now warms up much faster than the other -- this didn't happen before --, heats up more at idle -- the cooler engine idles at about 135-140 degrees (160 degree thermostats in both) where as the problem child idles at 160-170 degrees --, and runs warmer under load -- 175 degrees verses 165-170 for the cooler engine. The baffling thing is that both engines used to warm up at just about the same rate, ran cool at idle, and ran at just about the same temperature under load. The heat exchangers have been freshly serviced -- both coolant and oil coolers -- , the sea water pumps are low hours with new impellers, and the mixing elbows were replace 3 years ago. I'm about to try a new thermostat in the hot engine. Any opinions on whether I'm on the right track? BTW, I just replaced the circulating pump on the hot engine, it was squeeling -- quiet now, but the temp behavior hasn't changed. "