2002 Mercury 140hp Outboard Rebuilt Hot with 23psi

chapin123

Cadet
Joined
Aug 25, 2011
Messages
21
HI, i have a problem with my motor and it is that when cold the water pressure is at 10psi , but when we run it at 3500RPM it gets hot and the water pressure goes up to 23psi.

We suspect that there is a leak somewhere. All thermostat and puppet valve have been replaced.


Please send your comments.
 

Dukedog

Captain
Joined
Oct 6, 2009
Messages
3,235
All thermostat and puppet valve have been replaced.

Tha very first thing you replace on an "unknown" heat problem (after actual over heat is verified, not sensor or module) is complete OEM water pump kit....... Then go from there..........jmo
 
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