Mercruiser Overheating Problem Fixed 454 Engine Youtube Mercruiser 454 over heating cooling thermostat troubleshootingamazon affiliate links awesome hammock amzn.to 3bruxmw bug spray amzn.to 3sajgou. New member. jun 28, 2017. #1. i have an older 454 with rebuilt carb and a closed heating system with heat exchanger. it is overheating to 200 deg. i put a thru hull pick in, new impeller, new water pump, stat is 160 deg. slowly runs up to 200 deg and then i idle back down. any thoughts on what else could be wrong.
How To Diagnose Mercruiser Engine Overheating Part 1 Cooling System I have a 1998 454 mag mpi completely rebuilt with a bravo 1. regular temp at idle. overheats as soon as i get any rpms then cools down when i slow back down. interestly i have bubbles in the clear flush "t". the t is right before the raw water impeller on the engine. i use the t to flush the engine because it is on a lift. Dennis allen of affordable marine service explains mercruiser overheating problem solved. listen to and watch this short clip on how we traced a very rare ov. Re: 1993 mercruiser 7.4l 454 high temp overheating. water will come out the exhaust, but not actually go through the motor very well. the things to check would be on top of the engine at the thermostat housing. i would start with the thermostat itself and check yo see if there are clogs, etc that is preventing flow through the engine block. General q & a 454 merc overheating, please help!!! i hope you might be able to provide some advise. i have just bought a 1995 272 islander baja with a carbureted generation v merc 454, sr number of413462, with a bravo 1. the first 3 times i have had it on the water (fresh water only boat) it has overheated. the.
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