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Unread 07-25-2006, 12:56 AM
CT_V-20 CT_V-20 is offline
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Join Date: May 2004
Location: CT
Posts: 394
Default Re: I/O running temperature

Owners manual on my 5.7 Mercruiser says 160 degrees. I was running hotter and had a new thermostat (i think 140 degrees) put in and a couple barnacles in the intake cleared. runs perfect now. I was running +200 prior to the fix and that's too hot for my engine.
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1984 248 Sportsman w/1999 5.7L EFI Mercruiser
2001 Carolina Skiff J16 w/2005 25hp Yamaha tiller control
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