Running temp for 5.7 Merc?

Wardy

Recruit
Joined
Aug 30, 2007
Messages
4
I recently bought a Larson 250 San Marino. It has not been used much the last few years and has low hours overall, When I first took it out it ran at about 130 degrees and last time I had it out it ran at 140 degrees until I shut it down. When I restarted it for the trip home it ran about 155 degrees. One of my buddies says that 155-170 is normal and maybe it was a sticky thermostat that caused it to run so cool the first time I had it out. Any info would be appreciated. Thanks
 

rickdb1boat

Supreme Mariner
Joined
Jan 23, 2002
Messages
11,195
Re: Running temp for 5.7 Merc?

160* sounds about right, depending on water temps..
 
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