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Engine Squealing Noise-97 Wrangler 4cyl.

Tiny
RICTUS58
  • MEMBER
  • 1997 JEEP WRANGLER
I had my Water pump and Serpentine replaced in sept 2006. Last week there was a squealing noise under the hood that would occur between 2k-3krpm. Higher than that the noise disappears. I took it to the shop, they said the pulleys all look fine and replaced the belt again, but the noise still continues. What could be causing this to happen even after the belt was replaced? The tension on the belt is fine. Could this be the result of the excessive amount of Salt thrown down on the roads due to recent snow/ice? I don't want to spray any lube like WD-40 as I was told this would contribute to the degredation of the Serpentine Belt.
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Wednesday, February 14th, 2007 AT 12:41 PM

10 Replies

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Look in the pulley grooves for debris. Clean out as necessary, anything in there will affect the belts ability to grip the pulley. Rev the engine while watching the tensioner to be sure it is moving through its entire range, might be weak and when the belt grows with RPM it cant maintain tension
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Wednesday, February 14th, 2007 AT 3:24 PM
Tiny
RICTUS58
  • MEMBER
  • 6 POSTS
Would using a pressure washer work?
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Thursday, February 15th, 2007 AT 6:30 AM
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
I usually use a small wire brush. Have to remove any rubber in the grooves
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Thursday, February 15th, 2007 AT 10:27 AM
Tiny
RICTUS58
  • MEMBER
  • 6 POSTS
Now there is a loud knocking noise coming from the engine. Is this related?
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Monday, February 19th, 2007 AT 12:34 PM
Tiny
CHEVY22
  • MECHANIC
  • 1,375 POSTS
Sounds like maybe a rod or main bearing was going bad, possibly.
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Monday, February 19th, 2007 AT 12:37 PM
Tiny
RICTUS58
  • MEMBER
  • 6 POSTS
Is that an expensive fix?
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Monday, February 19th, 2007 AT 12:39 PM
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
You cleaned the pulleys and now the engine knocks?
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Monday, February 19th, 2007 AT 12:46 PM
Tiny
RICTUS58
  • MEMBER
  • 6 POSTS
Pulleys cleaned. The sound went away for a few days. Then on the way to work, I heard what sounded like a snap. The belt looks to be slightly off center on one of the pulleys now. Ow there is a clanging noise (I'm sure that's a technical term) when the car is idiling. At highway speed, that sound is not there.
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Monday, February 19th, 2007 AT 12:48 PM
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Take the belt off and listen for the noise to eliminate the accessories as the source
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-1
Monday, February 19th, 2007 AT 12:49 PM
Tiny
RICTUS58
  • MEMBER
  • 6 POSTS
Well, I took the Jeep back to the shop. One of the Idle Pulleys was missing bearings. They did the repair free of charge. Thanks for all your help. It is greatly appreciated.
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Wednesday, February 21st, 2007 AT 7:01 AM

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