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Old 12-29-2014, 07:53 PM   #1
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Default Squeaky serpentine belt. Solved!

I've been chasing squeaking belts on both motors since I got the boat. I think I finally solved it.

It appears that I was over tightening the belts. With the cheap stamped steel brackets for water pump, alternator, and power steering pump, the belt was actually flexing them in, causing the pulleys to be at an angle. This was causing the edge of the belt to rub against the edge of the pulley and squeak.

Haven't had it out and under load yet, but with the belt looser, both engines are running quiet.

I had searched many forums, and never saw anyone mention overtightened belts as a possible cause of squeak, so I'd thought I'd post it, in case anyone else is searching.
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Old 12-29-2014, 09:34 PM   #2
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I have found that serpentine belts do not need to be as tight as a regular v-belt. Better design and I think better running surface.
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Old 12-29-2014, 10:46 PM   #3
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Buy having them too tight you were also wearing out bearings faster.
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Old 12-29-2014, 11:54 PM   #4
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My 97' had a bent raw water pump (B2) when I got it, this resulted in a misalign and belt wear.

Good for you and hope all else is fine
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Old 12-30-2014, 04:09 PM   #5
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Don’t the serpentine set ups have an idler and tensioner pulley…. I.E. no tightening required??
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Old 12-30-2014, 06:41 PM   #6
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Not a gm based spring tensioner....
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Old 12-30-2014, 09:52 PM   #7
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My 5.7LX is not spring loaded, the tensioner has a star gear that rides in teeth on the pully bracket. A socket is used the set the tension and then you tighten a nut to lock it.
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Old 12-30-2014, 10:37 PM   #8
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The tensioner that mmwjr is talking about, it is very easy to over tighten.
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Old 12-30-2014, 10:41 PM   #9
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No, like Mike said, it is a manual tension adjustment.



All the vehicles with serpentine belts I've had were spring tensioned, so I guess I've never really dealt with serpentine belt tension before. With v belts, well, if they squeak, tighten them. It appears that logic doesn't apply here.



When I first started messing with them, I remember thinking, why did they make the shaft so small (5/16's)? How are you going to put a big enough wrench on that?



Well it appears that one finger of force on the little wrench is all you need!

Taking the boat out tomorrow to go downtown for the new years fireworks and party at the Jacksonville Landing. Will find out then if I've solved the belt squeak, and starboard power loss.
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Old 12-31-2014, 03:33 PM   #10
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My 8.1 has a spring tensioned serpentine belt. I admit, it makes changing the belt extremely easy. I would assume there are torque specs for tensioning the belt, are there not?
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