Ugh!!!!!! Chirping!!!!!!!!!!!!!
Thread Starter
Racer
Joined: May 2003
Posts: 439
Likes: 1
From: Palm Desert CA
Ugh!!!!!! Chirping!!!!!!!!!!!!!
Ok, first of all for the folks who like to tell people "search is their friend" and "this has been discussed a hundred times", I know that. I had the crank pulley replaced and since then I have had a chirp from the from of the motor that I can't seem to fix. I have done the following:
1. Replaced both belts with gatorbacks
2. Replace all tensioner and idler pulleys
The only thing I haven't done is physically check pulley alignment, however there is no visible misalignment. So, the question I have is:
Can the crank pulley be put on such that it is to far or not far enough on the crank leading to misalignment with the other pulleys?
There was absolutely no chirp problem before the crank pulley replacement.
The chirp is rpm sensitive. At idle no chirp, above about 1000 rpm chirp starts and gets louder until one reaches the maximum rpm of the pulley system. Chirp moves higher up the rpm range as the engine temperature increases. At about 194 F or so, the chirp is above 2000 rpm.
Any suggestions intended to be helpful are greatly appreciated.
Danny
1. Replaced both belts with gatorbacks
2. Replace all tensioner and idler pulleys
The only thing I haven't done is physically check pulley alignment, however there is no visible misalignment. So, the question I have is:
Can the crank pulley be put on such that it is to far or not far enough on the crank leading to misalignment with the other pulleys?
There was absolutely no chirp problem before the crank pulley replacement.
The chirp is rpm sensitive. At idle no chirp, above about 1000 rpm chirp starts and gets louder until one reaches the maximum rpm of the pulley system. Chirp moves higher up the rpm range as the engine temperature increases. At about 194 F or so, the chirp is above 2000 rpm.
Any suggestions intended to be helpful are greatly appreciated.
Danny
Racer
Joined: Mar 2011
Posts: 420
Likes: 13
From: West Deptford NJ
Remove the alternator belt and listen again. This would help isolate the source. I have read some members moving the AC compressor around on the mounting bolts slightly. Check the AC clutch bearing. The alternator itself can also be a source.
Lots of posts on this. Here is one from today.
http://forums.corvetteforum.com/c5-t...e-is-back.html
Lots of posts on this. Here is one from today.
http://forums.corvetteforum.com/c5-t...e-is-back.html
Last edited by jlaw1313@comcast.net; May 25, 2013 at 12:41 AM.
Thread Starter
Racer
Joined: May 2003
Posts: 439
Likes: 1
From: Palm Desert CA
Checked pulley alignment. There is approximately a 1 mm difference between the alternator pulley and the PS pulley. The PS pulley approximately 1 mm closer to the motor. Not much there. The other pulleys are closer if not exactly aligned.
No certain that small of a misalignment would have an impact. Still pondering.
No certain that small of a misalignment would have an impact. Still pondering.
Team Owner
Joined: Dec 1999
Posts: 174,312
Likes: 1,217
From: Here
Pilot of Beer Force 1
Tampa Regional Coordinator
CI 4-5-6-7-8 Veteran
Organizer St. Jude Fundraiser
I believe in the Beer Fairy
I always say remove both belts and start the car....
squeak = problem
no squeak reinstall serp belt only.....start car...if you get the noise you have eliminated the AC pulleys if no noise reinstall AC belt and check again...pain in the ***
squeak = problem
no squeak reinstall serp belt only.....start car...if you get the noise you have eliminated the AC pulleys if no noise reinstall AC belt and check again...pain in the ***
Thread Starter
Racer
Joined: May 2003
Posts: 439
Likes: 1
From: Palm Desert CA
Removed the accessory belt and chirp was gone. So, AC belt and pulleys are fine. Removed accessory tensioner and idler pulleys, check for play, wear, etc. They were ok. Checked alternator and PS pulley no apparent wear. Replaced belt, chirp back. Dripped small amount of water onto belt while running, chirp went away until water dried up. So, appears to be belt issue, either belt compound or pulley alignment. Have ordered another belt, in that, I don't believe a misalignment of as little as 0.5 to 1 mm could be the cause. More to come late next week after I install the new belt.
Danny
Danny
Racer
Joined: Mar 2011
Posts: 420
Likes: 13
From: West Deptford NJ
Removed the accessory belt and chirp was gone. So, AC belt and pulleys are fine. Removed accessory tensioner and idler pulleys, check for play, wear, etc. They were ok. Checked alternator and PS pulley no apparent wear. Replaced belt, chirp back. Dripped small amount of water onto belt while running, chirp went away until water dried up. So, appears to be belt issue, either belt compound or pulley alignment. Have ordered another belt, in that, I don't believe a misalignment of as little as 0.5 to 1 mm could be the cause. More to come late next week after I install the new belt.
Danny
Danny
Team Owner
Joined: Dec 1999
Posts: 174,312
Likes: 1,217
From: Here
Pilot of Beer Force 1
Tampa Regional Coordinator
CI 4-5-6-7-8 Veteran
Organizer St. Jude Fundraiser
I believe in the Beer Fairy
Removed the accessory belt and chirp was gone. So, AC belt and pulleys are fine. Removed accessory tensioner and idler pulleys, check for play, wear, etc. They were ok. Checked alternator and PS pulley no apparent wear. Replaced belt, chirp back. Dripped small amount of water onto belt while running, chirp went away until water dried up. So, appears to be belt issue, either belt compound or pulley alignment. Have ordered another belt, in that, I don't believe a misalignment of as little as 0.5 to 1 mm could be the cause. More to come late next week after I install the new belt.
Danny
Danny
Burning Brakes
Joined: Mar 2010
Posts: 960
Likes: 1
From: Trussville AL
Mine has driven me nuts. I'm going to buy an alignment laser and see what it tells me. Maybe we should all chip in a few bucks each and share it. With all the belt noise problems forum members have we could keep one out in rotation. Members not in on the purchase could use it for a 5 or 10 dollar donation to Vettes for Vets. Stupid idea?
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
Le Mans Master
Joined: Mar 2002
Posts: 8,466
Likes: 51
St. Jude Donor '17
Thread Starter
Racer
Joined: May 2003
Posts: 439
Likes: 1
From: Palm Desert CA
Crank pulley appears to be running straight. It would seem if the crank pulley was the problem the chirp would be present even with the accessory belt off because the AC belt also runs off the crank pulley. So, I don't believe the crank pulley is the cause. Didn't use an ARP bolt, but, did check to ensure the bolt had not backed out after installation. No problem there. So, back to belt compound as the most likely cause. Should have the gatorback later this week and will see if that results in a solution.
Interesting find in my research on belt noise is the use of talcum powder to stop the noise, at least for a few hundred miles. A little on the belt works great. Who would have thought of that.
Danny
Safety Car
Joined: Jul 2005
Posts: 3,572
Likes: 9
From: Jackson Tn
St. Jude Donor '06-'07-'08-'09
I have use a bar of soap to clean the inside of the belt and it's worked before. Just be careful and put the bar slightly on the inside while its running. This will help clean the pulley grooves too
Le Mans Master
Joined: Mar 2002
Posts: 8,466
Likes: 51
St. Jude Donor '17
Crank pulley appears to be running straight. It would seem if the crank pulley was the problem the chirp would be present even with the accessory belt off because the AC belt also runs off the crank pulley. So, I don't believe the crank pulley is the cause. Didn't use an ARP bolt, but, did check to ensure the bolt had not backed out after installation. No problem there. So, back to belt compound as the most likely cause. Should have the gatorback later this week and will see if that results in a solution.
Interesting find in my research on belt noise is the use of talcum powder to stop the noise, at least for a few hundred miles. A little on the belt works great. Who would have thought of that.
Danny
Interesting find in my research on belt noise is the use of talcum powder to stop the noise, at least for a few hundred miles. A little on the belt works great. Who would have thought of that.
Danny
With out the belt on it there will not be tension on the pulley so no noise. The new belt may stop the sqwak for a bit but due to stating the problem started right after the dampner change it seems to be the spot i would double check.
Team Owner
Joined: May 2001
Posts: 36,836
Likes: 244
From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Wire brush the crank pulley grooves.
I know, I know, "They look OK", but do it anyway. You'd be surprised. Even a little sand/grit/debris can get compacted into the groves and cause the belt to run a bit too high.
PITA? Yes. Do it anyway. Try to get all the around if you can.
HTH
I know, I know, "They look OK", but do it anyway. You'd be surprised. Even a little sand/grit/debris can get compacted into the groves and cause the belt to run a bit too high.
PITA? Yes. Do it anyway. Try to get all the around if you can.
HTH
Thread Starter
Racer
Joined: May 2003
Posts: 439
Likes: 1
From: Palm Desert CA
Thanks for the suggestions, guys. I did clean/brush the grooved pulleys, all the way around. the crank pulley bolt was a new stock one and was installed via the GM procedure by the corvette shop that I use. I checked the crank pulley bolt for any signs of backing out and found no indication of that happening.
I replaced the belt last night with a gatorback and the chirp is gone. We'll see if it stays that way.
Danny
I replaced the belt last night with a gatorback and the chirp is gone. We'll see if it stays that way.
Danny
Le Mans Master
Joined: Oct 2004
Posts: 9,369
Likes: 4
From: Zephyrhills, Florida
St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13
Thread Starter
Racer
Joined: May 2003
Posts: 439
Likes: 1
From: Palm Desert CA
Danny
Pro
Joined: Mar 2004
Posts: 653
Likes: 0
Just use plain white toothpaste, the abrasives it contains do a good job of polishing the surfaces of the pulleys and belt and the effect is pretty much permanent as long as your belt doesn't start slipping and glaze them up.
Thread Starter
Racer
Joined: May 2003
Posts: 439
Likes: 1
From: Palm Desert CA
Well, no joy. Still chirping. Have replaced both belts with gatorbacks. Have replaced ac idler and tension pullies. The chirping occurs when engine temperature is below ~200 F. Above 200 F there is no chirp. Only chirps when accessory belt is on, so chirp is not from ac belt system. Chirp goes away when I put talcum powder or water onto accessory belt. So, I am assuming the cause of the chirp is alignment at this point rather than the accessory idler or tension pullies because the chirp goes away when putting talcum powder or water on the belt surface....? Is my logic sound on this?
By the way, I used some toothpaste and it did stop the chirp for a day or so, but, the chirp did come back.
Going nuts..........Danny
By the way, I used some toothpaste and it did stop the chirp for a day or so, but, the chirp did come back.
Going nuts..........Danny
