Mystery squel
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Mountain Pass
Joined: Aug 2012
Posts: 249
Likes: 0
From: Boise, Idaho
Mystery squel
I have a high pitch sequel / chirp that I thought was coming from an idler wheel or pulley bearing and has been on going for the last three summers. No one can figure it out. Happens when the fan kicks on high, consistent with high RPM's. Normally happens when pulling a hill towing my toy hauler. If I can stay around 2,200 RPM I can quiet it down anything above that it gets loud.
I've towed with my mechanic while he was hooked up to his computer everything seemed fine. replaced the cooling or clutch fan I believe (not familiar with what is up there )I have scuffed the pulleys and put on a gates green belt to make sure it wasn't slipping. It is at the tire shop now getting some new parts in the front end and they don't see anything wrong with it, or can get it to make any noise, but again it does it when its hot going up hill towing. Once the fan kicks off high it stops.
Any ideas?
thanks,
I've towed with my mechanic while he was hooked up to his computer everything seemed fine. replaced the cooling or clutch fan I believe (not familiar with what is up there )I have scuffed the pulleys and put on a gates green belt to make sure it wasn't slipping. It is at the tire shop now getting some new parts in the front end and they don't see anything wrong with it, or can get it to make any noise, but again it does it when its hot going up hill towing. Once the fan kicks off high it stops.
Any ideas?
thanks,
Laughing Gas
Joined: Oct 2013
Posts: 817
Likes: 6
Jiggle the wiring going to the fan clutch (it's on top of the radiator shroud) and see if that is the same sound. If so, the only way to fix that is a new clutch. It's kind of a long shot but it's something to try.
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Mountain Pass
Joined: Aug 2012
Posts: 249
Likes: 0
From: Boise, Idaho
thanks, I will have that checked. So far they are saying the fan and everything look fine.
Fleet Mechanic
Joined: Jul 2013
Posts: 1,330
Likes: 65
From: 'Pitlock, Maine
Even the tensioner would LOOK fine but as stated above...it may be weak and letting the belt slip under load.
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Mountain Pass
Joined: Aug 2012
Posts: 249
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From: Boise, Idaho
What is the best way to check that? At this point (3 years) I feel like I will have to ask for something specific to be done to figure it out.
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Fleet Mechanic
Joined: Jul 2013
Posts: 1,330
Likes: 65
From: 'Pitlock, Maine
I'm not sure if there is a technical way to check it, but if you grab the belt just below the alternator pulley (while standing by the right front wheel of the truck, you should find it extremely difficult to pull any amount of slack in the belt. Maybe someone can chime in with an accurate way to determine the actually resistance that it is suppose to require. like in PSI or the like. I know I'm not much help here, but that's all I got.
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Posting Guru
Joined: Nov 2011
Posts: 1,664
Likes: 4
From: Southern AZ
I have a high pitch sequel / chirp that I thought was coming from an idler wheel or pulley bearing and has been on going for the last three summers. No one can figure it out. Happens when the fan kicks on high, consistent with high RPM's. Normally happens when pulling a hill towing my toy hauler. If I can stay around 2,200 RPM I can quiet it down anything above that it gets loud.
I've towed with my mechanic while he was hooked up to his computer everything seemed fine. replaced the cooling or clutch fan I believe (not familiar with what is up there )I have scuffed the pulleys and put on a gates green belt to make sure it wasn't slipping. It is at the tire shop now getting some new parts in the front end and they don't see anything wrong with it, or can get it to make any noise, but again it does it when its hot going up hill towing. Once the fan kicks off high it stops.
Any ideas?
thanks,
I've towed with my mechanic while he was hooked up to his computer everything seemed fine. replaced the cooling or clutch fan I believe (not familiar with what is up there )I have scuffed the pulleys and put on a gates green belt to make sure it wasn't slipping. It is at the tire shop now getting some new parts in the front end and they don't see anything wrong with it, or can get it to make any noise, but again it does it when its hot going up hill towing. Once the fan kicks off high it stops.
Any ideas?
thanks,
Richard
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Mountain Pass
Joined: Aug 2012
Posts: 249
Likes: 0
From: Boise, Idaho
Nothing I could find there, The squeal didn't happen when I towed this last weekend which was surprising as the temp was in the 100's, on the freeway on the way home my radiator blew apart.. Could it possible been that failing all these years?
Fleet Mechanic
Joined: Feb 2008
Posts: 1,955
Likes: 6
From: Eastern PA
I'm not sure if there is a technical way to check it, but if you grab the belt just below the alternator pulley (while standing by the right front wheel of the truck, you should find it extremely difficult to pull any amount of slack in the belt. Maybe someone can chime in with an accurate way to determine the actually resistance that it is suppose to require. like in PSI or the like. I know I'm not much help here, but that's all I got.
Posting Guru
Joined: Nov 2011
Posts: 1,664
Likes: 4
From: Southern AZ
Richard
EDT:
EDT2: there are also deflection gauges you can use to measure belt tension. I think if someone has a FSM handy they can give you the spec, I dont know it off the top of my head.
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