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#1
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overheating inboard
I have an 85 Supra Saltare with a Chevy 454 PCM engine that is overheating.
I have replaced the impeller, thermostat, water pump and hose between pump and thermostat housing and it still overheats. This boat for the last 2-3 years always runs between 125-150 degrees. It doesn't seem to get hot at idle speed, but as soon as you accelerate within 60 seconds the temperature shoots up to 190. I will put it out of the water soon to check for exhaust blockage, but is there any other common problems I should look for ? Thanks Saltare |
#2
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overheating inboard
How does the hose from the sea cock to the pump look? It could be
collapsing internally. "Saltare" wrote in message igy.com... I have an 85 Supra Saltare with a Chevy 454 PCM engine that is overheating. I have replaced the impeller, thermostat, water pump and hose between pump and thermostat housing and it still overheats. This boat for the last 2-3 years always runs between 125-150 degrees. It doesn't seem to get hot at idle speed, but as soon as you accelerate within 60 seconds the temperature shoots up to 190. I will put it out of the water soon to check for exhaust blockage, but is there any other common problems I should look for ? Thanks Saltare |
#3
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overheating inboard
"Saltare" wrote in message
igy.com... I have an 85 Supra Saltare with a Chevy 454 PCM engine that is overheating. Have you observed that sufficient raw water is making its way through the exhaust system? |
#4
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overheating inboard
I talked to a marine heat exchanger specialist http://www.holtcorp.com/ just last week about this issue. He recommended: Check the raw water intake side of the oil cooler, transmission cooler and heat exchanger for grass, seaweed etc. (I disassembled the exchanger and reamed out a few of the holes with a straight piece of coathanger, then I poured water into the top to make sure it flowed out the bottom.) Check all hoses for kinks. Drop the coolant mixture to 20/80 from the 50/50 (Mercruiser only) I'll drain all of it for winter. Check the flow of raw water out of the exhaust pipe at 1000 rpm's. I don't have the expected flow rate with me.Give the amount that ends up in a 5 gallon bucket after 15 seconds and I'll reply to the group. I removed the water flow sensor as the 1" pipe is reduced by about 50% by the plastic valve inside. I don't know which one worked but I'm not overheating at high ( 3800) rpm's anymore. " |
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