Chevy 350 Motor that squeaks...?? - Page 2 - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-04-2013, 04:49 AM
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Sounds like a loose belt. Do you know how to check the belt for tightness? V-belt, should be able to rotate/twist it 180 degrees and a serp belt should rotate 90 degress - no more and no less for both, within reason. What kind of shape is the belt(s) in? Cracks and glazed is bad and can cause your problem even if adjusted properly. Basically, if the belt(s) are old, then replace them.

Spraying WD40, PB blaster, etc., has only one use, to help narrow down where the squeaking is coming from. As others have said, as soon as it dries the problem it was masking is back.

Also be sure to check every rotating component on the front of the motor by removing belt(s) and spinning to check for any binding or noise. Do it both hot and cold.

Almost forgot, there are three brands of belts that are reasonable, Goodyear, Dayco and Gates. All others are a waste of time. I highly recommend Goodyear. (Others here might disagree, but....)

Good Luck - Jim

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  #17 (permalink)  
Old 06-04-2013, 05:12 AM
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I found that on a regular service on a mazda i did, i changed the old v belts for a new set which created a "squeal" on start up. No matter how i adjusted the tension the problem persisted so i ended up taking them off and reusing the old belts. The only explanation i could come up with is the type of compound used in the manufacture of the new belts had less grip or a harder compound was used in the belt. Assuming you are talking about " vee" belts make sure you have the right section of belt for the pulley and that it is not " bottoming " out in the bottom of the pulley if it has a flat bottom in the "vee"
I have also found that roughing up the highly polished surface of "v" pulleys with a coarse abrasive also will have an effect on "squeal" and give the belt a little more grip.
Goodluck,
Al.
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Old 06-04-2013, 05:41 PM
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Quote:
Originally Posted by 68NovaSS View Post
I can't believe anyone would actually recommend putting a lubricant on a drive belt!
i had a guy at work who would use a bar of ivory soap on his belt , was an buick regal or something with the 3800 sure enough the belt would squeal he'd take out a bar of soap push it against the belt with the engine running and it would go silent.

each time he did it it would keep the belt silent for a month at a time
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Old 06-04-2013, 06:54 PM
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Originally Posted by bigfoot21075 View Post
Ummm the alternator does not vary its resistance related to electrical need - it is constant relative to rpm, no matter the load on the charging system.
Oh really. I invite you to rig a little run stand with an alternator, a belt, an 8 hp engine and the required wiring. Give the rope a yank. Now repeat this test but hook the alternator up to a car battery that only has about a 5 volt charge. Now once again give the rope a yank, hope you don't throw your shoulder out.
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