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57 Squealing Noise

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ken_r

Member
"Hi. 5.7 Mercruiser Alpha 1...

"Hi. 5.7 Mercruiser Alpha 1...at higher speeds intermittent/almost continuous loud squeal...belts good, new u joints, 1 season on gimble bearing(no water leaks)... coupler 2 seasons with no indication of wear(no slippage)... electrics normal...seems to have lost about 100rpm on WOT. Thoughts..
thanks in advance"
 
You may have a belt slipping d

You may have a belt slipping due to an tensioner bearing going bad or a water pump going bad.

Does it have a serpentine belt or v-velts? They need to be fairly tight. Anyway... belts are the first thing to come to mind.
 
"See any fur on the belts? Co

"See any fur on the belts? Could be a cat!
biggrin.gif
"
 
"I haven't seen a pump mak

"I haven't seen a pump make that noice but when they go bad, the pully can have some fore/aft play, they will leak and or the bearings will growel. Doubt you have such a problem.

Run it without the dog house and see what you can hear.

Guy - don't make me post the pic of that cat on the front of my old boat. You know the pic!"
 
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