| [GMCnet] Engine sqeak greater than 50 mph [message #68468] |
Sun, 27 December 2009 11:08  |
gmc gmc
Messages: 69
Registered: May 2009
Karma: 0
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Member |
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Hello all,
We are southbound i39 in Illinois. When we exceed about 50 mph we hear
from the engine a constant higher pitched sqeaking sound. It seems to
lessen when we release the accelerator. We suspect it might be a loose
belt, possibly the alternator? We stopped and opened engine
floorboard, started the motor, all was normal. Reved the motor a
little heard some squeaking, one belt looked like it vibrated a
little. Suggestions? Should we stop and try to tighten alternator
tension?
Thank you
Southbound,
Mike and Steph
Sent from my iPhone
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| Re: [GMCnet] Engine sqeak greater than 50 mph [message #68474 is a reply to message #68468] |
Sun, 27 December 2009 12:11  |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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| gmc gmc wrote on Sun, 27 December 2009 10:08 |
Hello all,
We are southbound i39 in Illinois. When we exceed about 50 mph we hear
from the engine a constant higher pitched sqeaking sound. It seems to
lessen when we release the accelerator. We suspect it might be a loose
belt, possibly the alternator? We stopped and opened engine
floorboard, started the motor, all was normal. Reved the motor a
little heard some squeaking, one belt looked like it vibrated a
little. Suggestions? Should we stop and try to tighten alternator
tension?
Thank you
Southbound,
Mike and Steph
Sent from my iPhone
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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Sounds like it can be a belt. The vibration you see is normal but can get worse with a loose belt. I'd start with tightening the alternator. Are you pulling a high electrical load? I doubt it's the power steering belt going straight down the road.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Engine sqeak greater than 50 mph [message #68497 is a reply to message #68468] |
Sun, 27 December 2009 14:32 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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| gmc gmc wrote on Sun, 27 December 2009 12:08 |
Hello all,
We are southbound i39 in Illinois. When we exceed about 50 mph we hear from the engine a constant higher pitched sqeaking sound. It seems to lessen when we release the accelerator. We suspect it might be a loose belt, possibly the alternator? We stopped and opened engine floorboard, started the motor, all was normal. Reved the motor a little heard some squeaking, one belt looked like it vibrated a little.
Suggestions?
Should we stop and try to tighten alternator tension?
Thank you
Southbound,
Mike and Steph
|
Mike,
It would be a very good idea for you to stop now and at lease try to tighten the belts. The only one that has an excuse to squeal at road speed is the alternator belt. If you let it go too long, you will not be able to tighten what you have left.
Good Luck
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Engine sqeak greater than 50 mph [message #68511 is a reply to message #68468] |
Sun, 27 December 2009 15:59 |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
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Senior Member |
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| gmc gmc wrote on Sun, 27 December 2009 09:08 |
Hello all,
Suggestions? Should we stop and try to tighten alternator
tension?
Thank you
Southbound,
Mike and Steph
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If you are almost home or will soon be at a better location for a fix you can put a little honey on the belt. (When the engine is stopped!) It will stop slipping and shut up for about 100 miles.
(Man, I am going to be beat up about this suggestion. Cutting wood with a buzz saw when I was a kid... great fix for a falt belt.)
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
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| Re: [GMCnet] Engine sqeak greater than 50 mph [message #68692 is a reply to message #68626] |
Mon, 28 December 2009 21:04 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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I got thinking about the noise. It could be the AC/clutch or the fan clutch.
The next time you hear it, turn on the AC and see if the noise goes away.
Sometime reach in the fan shroud (with the engine not running) and rock the fan forward and backward to see if there is any play in the clutch.
The previous suggestions were probably the cause of the noise but I thought I would give you some more possibilities.
Ken
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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