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jps

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Supra overheating

In article m,
says...
I have an 85 Supra Saltare witha PCM 454 Chevy inboard engine that is
overheating as soon as it gets revved over idle speed. I have replaced
impeller, thermostat, and water pump with no change. I know the hose is
clear from the impeller to the water intake under the boat, because I ran
water from the impeller down to the water intake, but it doesn't appear to
be taking the water in up to the impeller. I checked this by unhooking the
hose from the impeller to the thermostate housing and its not getting any
water. I know the impeller is turning i.e. turning gear operates correctly
and belt is not slipping. I am at wits end. Does anyone have any ideas?

Thanks

Saltare

If you know the intake side from the thru hull is clear and you know the
outflow is clear from the seawater pump is then the impeller key may be
sheared.

Sounds like the impeller isn't impelling.

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