Squealing noise
Thread Starter
Racer
Joined: Dec 2022
Posts: 273
Likes: 142
From: North Central Ohio
Squealing noise
So I have just developed a squeal from the accessory drive on my engine. All tensioners and idler pulleys are new within the last 3 months. The belt is also new but has a little film on it, so I'm thinking water pump. It is dry underneath the water pump pulley. What is everybody's opinion here? Just looking for input here before I just start ordering parts.
TIA!
TIA!
Safety Car
Joined: Feb 1999
Posts: 4,043
Likes: 342
From: Central NJ
So I have just developed a squeal from the accessory drive on my engine. All tensioners and idler pulleys are new within the last 3 months. The belt is also new but has a little film on it, so I'm thinking water pump. It is dry underneath the water pump pulley. What is everybody's opinion here? Just looking for input here before I just start ordering parts.
TIA!
TIA!
Thread Starter
Racer
Joined: Dec 2022
Posts: 273
Likes: 142
From: North Central Ohio
Pro
Joined: Dec 2014
Posts: 682
Likes: 276
From: Cincinnati Ohio
There is a Continental accessory drive belt that seems to work better than others for chirp and squeal. I used it to replace a Dayco belt that chirped after about 1000 miles and this Continental is still pretty good 2 years later.
Continental OE Technology Series 4060798 6-Rib, 79.8" Multi-V Belt
Thread Starter
Racer
Joined: Dec 2022
Posts: 273
Likes: 142
From: North Central Ohio
Got the problem fixed, for once it was simple! The coolant hose clamp underneath the throttle body wasn't quite tight letting a little seepage out which got on the belt. All quiet now except for a belt "hum", so I may just have to try that Continental belt. Thanks for all the suggestions!!
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Got the problem fixed, for once it was simple! The coolant hose clamp underneath the throttle body wasn't quite tight letting a little seepage out which got on the belt. All quiet now except for a belt "hum", so I may just have to try that Continental belt. Thanks for all the suggestions!!
1, Make sure the belt is in good shape
2. CLEAN THE GROOVED PULLIES. Use a small SS toothbrush wire brush and with engine idling, CAREFULLY use the brush to clean the groves on each pulley. You will be amazed at what comes out.
3. Examine the belt tensioners for proper tension and excessive movement during engine operation. There is a tension gage pointer on the arm and a belt tension span box on the housing. Make sure that the pointer is inside the box for proper belt tension and the pointer is not jumping around..
4. A4 Automatic Transmission C5 use an alternator Decoupler / Dampener pully and that special pulley can cause issues like that. Check out the link:
https://www.google.com/search?q=acde...qtsPqfmOgAk_65
5. Insure that all the idler pully bearings are quiet using a Mechanics Stethoscope.
BC
Last edited by Bill Curlee; May 20, 2023 at 03:12 PM.
Thread Starter
Racer
Joined: Dec 2022
Posts: 273
Likes: 142
From: North Central Ohio
BELT HUM - Ive had several different Corvettes (two C5s) with Serpentine belts.. When the belts are causing issues, the first thing that I recommend is:
1, Make sure the belt is in good shape
2. CLEAN THE GROOVED PULLIES. Use a small SS toothbrush wire brush and with engine idling, CAREFULLY use the brush to clean the groves on each pulley. You will be amazed at what comes out.
3. Examine the belt tensioners for proper tension and excessive movement during engine operation. There is a tension gage pointer on the arm and a belt tension span box on the housing. Make sure that the pointer is inside the box for proper belt tension and the pointer is not jumping around..
4. A4 Automatic Transmission C5 use an alternator Decoupler / Dampener pully and that special pulley can cause issues like that. Check out the link:
https://www.google.com/search?q=acde...qtsPqfmOgAk_65
5. Insure that all the idler pully bearings are quiet using a Mechanics Stethoscope.
BC
1, Make sure the belt is in good shape
2. CLEAN THE GROOVED PULLIES. Use a small SS toothbrush wire brush and with engine idling, CAREFULLY use the brush to clean the groves on each pulley. You will be amazed at what comes out.
3. Examine the belt tensioners for proper tension and excessive movement during engine operation. There is a tension gage pointer on the arm and a belt tension span box on the housing. Make sure that the pointer is inside the box for proper belt tension and the pointer is not jumping around..
4. A4 Automatic Transmission C5 use an alternator Decoupler / Dampener pully and that special pulley can cause issues like that. Check out the link:
https://www.google.com/search?q=acde...qtsPqfmOgAk_65
5. Insure that all the idler pully bearings are quiet using a Mechanics Stethoscope.
BC
The belts, tensioners and all the pulleys with the exception of the Decoupler / Dampener pulley are about 3 months old. I was not aware of the special alternator pulley, so I will definitely check that out. It was kind of weird, rechecked everything yesterday, got the belt quiet again and drove to work. When I started it up to come home, the accessory drive was squealing again just like it was before. The sound did go away as it warmed up.
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