Overheating problem
#1
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Overheating problem
I have a 99 Baja 272 with a 502, it overheated at the end of last season so I replaced the impeller and thermostat. It's been running around 165-175 consistently since, then the other day I took off and it spiked up to 190 on a hard run, I idled down and it dropped right to 150. Then on the way back home not running too hard it read 180-190 the whole way until I idled backed down and it went immediately back to 150. I have steady water coming out of the exhaust the boat runs fine, no warning light or buzzer, wondering if this is normal or maybe a bad water temp sending unit?
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Wouldn't it have been doing that ever since the initial overheating if that was the case? I've put 10-15 hrs since it overheated and I've never had this happen. Oil looks good not milky or anything.
#4
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Your assumption is correct but IMO, the issues your running into now are leading my opinion toward a head gasket. Its spiking, and cools down once slowed down. Could also be something happened to the impeller, but checking an impeller can take more effort then running a compression test.
#5
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pull the hose off the sea pump going to the oil cooler and back flush the system, see if anything comes out.
#6
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I have a 99 Baja 272 with a 502, it overheated at the end of last season so I replaced the impeller and thermostat. It's been running around 165-175 consistently since, then the other day I took off and it spiked up to 190 on a hard run, I idled down and it dropped right to 150. Then on the way back home not running too hard it read 180-190 the whole way until I idled backed down and it went immediately back to 150. I have steady water coming out of the exhaust the boat runs fine, no warning light or buzzer, wondering if this is normal or maybe a bad water temp sending unit?
#9
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Surprised how many marinas don't do this after replacing worn out/busted up impeller. How can they not know ?
After this, and still heating up...then what Phragle said.