| Need help identifying noise [message #221254] |
Thu, 05 September 2013 19:33  |
MikeT
Messages: 225
Registered: November 2009
Location: Marine City, Michigan
Karma: 0
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Senior Member |
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Please help identify the noise I'm hearing coming from possibly the right front of the coach.
Sounds like the right front brake is dragging but if I apply the brakes the noise does not change in pitch. I recently checked the pads and it also has new rotors. The sound is intermittent but I hear it 90% of the time. Brand new Lenzi front end so I know it's not bearings, bushings or ball joints.
I don't know what a bad CV sounds like or maybe a final drive starting to fail. 77 Royale with 53k miles. Transmission shifts fine.
Please advise where to start looking.
Thanks
Mike Thomas
Marine City, MI
77 ex Palm Beach
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| Re: Need help identifying noise [message #221257 is a reply to message #221254] |
Thu, 05 September 2013 19:55  |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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| MikeT wrote on Thu, 05 September 2013 19:33 |
Please help identify the noise I'm hearing coming from possibly the right front of the coach.
Sounds like the right front brake is dragging but if I apply the brakes the noise does not change in pitch. I recently checked the pads and it also has new rotors. The sound is intermittent but I hear it 90% of the time. Brand new Lenzi front end so I know it's not bearings, bushings or ball joints.
I don't know what a bad CV sounds like or maybe a final drive starting to fail. 77 Royale with 53k miles. Transmission shifts fine.
Please advise where to start looking.
Thanks
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Mike
-- ac compressor clutch bearing ?
Dennis
Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: Need help identifying noise [message #221258 is a reply to message #221257] |
Thu, 05 September 2013 19:59 |
MikeT
Messages: 225
Registered: November 2009
Location: Marine City, Michigan
Karma: 0
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Dennis, AC compressor; very interesting. I know the ac doesn't work. How do I check it? I don't here the noise at idle when I start up. Only driving and makes the noise until I stop at a red light. Is it rpm based that makes the noise?
Mike Thomas
Marine City, MI
77 ex Palm Beach
[Updated on: Thu, 05 September 2013 20:09] Report message to a moderator |
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| Re: Need help identifying noise [message #221264 is a reply to message #221258] |
Thu, 05 September 2013 20:32 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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| MikeT wrote on Thu, 05 September 2013 19:59 |
Dennis, AC compressor; very interesting. I know the ac doesn't work. How do I check it? I don't here the noise at idle when I start up. Only driving and makes the noise until I stop at a red light. Is it rpm based that makes the noise?
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Mike
If the noise is not present at idle, slowly raise the engine rpm and see if it occurs. If not, it is more likely in the suspension or braking, especially since that is the last area you worked on.
Dennis
Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Need help identifying noise [message #221266 is a reply to message #221254] |
Thu, 05 September 2013 20:44 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Process of elimination. The final drive whine if present will change with load - different sound pulling vs coasting. Bearing sound will vary also with load... turning into or awy from will vary its sound. CVs will - usually - make a racket if you turn while loading them - accelerating around a corner for instance. Can you get a friend to drive beside the coach and listen on a quiet stretch of road and perhaps localize the noise? Or drive a bit with the engine hatch removed and have friend try to pinpoint the noise?
--johnny
'76 23' transmode Norris
'76 palm beach
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On Fri, 9/6/13, Thomas Mike <Mtt2961@gmail.com> wrote:
Subject: [GMCnet] Need help identifying noise
To: gmclist@temp.gmcnet.org
Date: Friday, September 6, 2013, 12:33 AM
Please help identify the noise I'm hearing coming from
possibly the right front of the coach.
Sounds like the right front brake is dragging but if I apply
the brakes the noise does not change in pitch. I recently
checked the pads and it also has new rotors. The sound
is intermittent but I hear it 90% of the time. Brand new
Lenzi front end so I know it's not bearings, bushings or
ball joints.
I don't know what a bad CV sounds like or maybe a final
drive starting to fail. 77 Royale with 53k miles.
Transmission shifts fine.
Please advise where to start looking.
Thanks
--
Mike Thomas
Troy, MI
77 ex Palm Beach, 77 Royale (rear bath)
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: Need help identifying noise [message #221267 is a reply to message #221254] |
Thu, 05 September 2013 20:45 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Put in neutral and shut off while rolling to rule out power train. Or rev in park yo see if it is .
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: Need help identifying noise [message #221290 is a reply to message #221258] |
Fri, 06 September 2013 00:09 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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| MikeT wrote on Thu, 05 September 2013 19:59 |
Dennis, AC compressor; very interesting. I know the ac doesn't work. How do I check it? I don't here the noise at idle when I start up. Only driving and makes the noise until I stop at a red light. Is it rpm based that makes the noise?
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If the AC doesn't work then simply remove the AC drive belt and drive it to see if the noise went away.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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