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First recorded activity by BoatBanter: Jul 2008
Posts: 21
Default Overheating/Steam - Thermo OK/One exhaust Riser hot - Mercruise 5.7 350MAG

Hi,

I have a 94' Chaparral w/a 5.7L Mercruiser 350MAG. Looking for some advice
on pinpointing a problem. Here's the story:

Last year everything was running fine. Beginning of this season i had the
outdrive/impeller serviced. After dropping it in the water i noticed that
one Riser gets extremely hot. This is def not the norm. The temp is
constant at 160 (thermostat setting). I took off the entire thermostat
housing (everything was fine), replaced the thermostat, took off the Riser
(everything fine), checked the exhaust flaps (everything fine), and all
hoses looked good. I can't figure out what could be the problem. My two
thoughts, either something happened over the course of the winter, but what?
or when the marina serviced the outdrive something got screwed up. but if
it was an water intake problem wouldn't both risers get really hot?

Any help troubleshooting is greatly appreciated.

Thanks!!


 
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