1988 60 hp merc outboard motor

ECRider

Recruit
Joined
Sep 9, 2005
Messages
1
heat alarm goes off on wot after about 3 seconds, runs & starts,idles fine. Have gone thru cooling system,new impeller,gaskets on exhaust system,pulled power head.5000 rpm, 4 lbs on water psi gage, at wot when alarm sounds. Stumped,any advice???
 

andy6374

Lieutenant Commander
Joined
Aug 4, 2005
Messages
1,617
Re: 1988 60 hp merc outboard motor

Do you have a temp gauge? Have you made sure plenty of water is coming out of the tell tale. A stuck poppet valve (stock close) could cause you to overheat at higher RPM's.<br /><br />-andy
 
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