Mercruiser 496 gets warm again.

Butbro

Cadet
Joined
Aug 27, 2023
Messages
12
I have a Mercruiser 496 2007 with closed cooling and it has only 150 hours.
It runs perfekt and get about 175-180 degrees when driving 25-30 knts.
If Igive more gas and drives 35-50 the alarm goes of and the temp rises to aprox 190-200.
Where to start, waterpump or mainfolds or what.?

Kenneth in Swede
 

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Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
50,804
have you checked the water passage for bravoitis?

have you pulled the end caps of the heat exchanger to check for debris?
 
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