mystery squeel at start up - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mcs336 · 04-18-2009, 03:58 PM

I have an 86 Chev PU with 305 V8 that I bought about a 2 months ago.
Has about 107K original miles with no apparent history of any major engine work.
At start up there is a high pitch squeel that lasts about 20 seconds to 1 minute and then goes away. It only seems to occur at cold starts. At times the squeel is very load and can really hurt your ears.
I have done all of the following and cannot figure out what the source is:
1. replaced water pump & hoses
2. replaced alternator
3. replaced belts
4. disconnected the air pump
5. disconnected power steering
Anyone have any ideas on what the problem could be?
Thanks

williej45 · 04-18-2009, 04:21 PM

Tighten your belts. Sounds like they are the problem.

**old Rusty C10** · 04-18-2009, 04:23 PM

the belts may have been loose for a long time and have literally polished the pulleys so that before they get warmed up from the motor heat, they slip and squeal.. you need to take off the belts and use a real light emory cloth and just take the shine off the pulleys then re install your belts and tighten to the proper tension and your squeal should go away

13lazer · 04-18-2009, 09:15 PM

Yup I had the same problem. Make sure all of the required belts are installed. Sometimes the AC compressor binds up, make sure its turned off.

silvereagle07 · 04-18-2009, 10:00 PM

You could always remove the belt and spin the pulleys to make sure there is no binding. While belts are removed start engine to verify the noise goes away. If the noise does go away remove the shine from the pulleys like Old Rusty said. I use a scotch brite pad (red).

3r!c84 · 04-18-2009, 10:55 PM

old rusty is right

i learned this back when i use to soup-up lawnmowers get them tight or they will howl like a dog until they heat up

or when they get wet lol

pig rig · 04-19-2009, 02:03 AM

spray belt dressing on them thats the easy way to find out if you need to pull the belts up to buff the pulleys

**78 Big10 454** · 04-19-2009, 07:10 AM

Had the same problem in my truck. It was the A/C compressor.

Tx Firefighter · 04-19-2009, 07:24 AM

I've seen this many times.....fan clutch....replace it and problem solved.

73chevyman · 04-21-2009, 02:27 PM

i just get some dish soap and squirt it on the belts makes it smell real good at start up if it's a belt squeal it should go a way then tighten all belts but i would say clutch fan, or ac compressor going

04-18-2009, 03:58 PM	#1
mcs336 Registered User Join Date: Mar 2009 Location: Memphis, TN Posts: 7	mystery squeel at start up I have an 86 Chev PU with 305 V8 that I bought about a 2 months ago. Has about 107K original miles with no apparent history of any major engine work. At start up there is a high pitch squeel that lasts about 20 seconds to 1 minute and then goes away. It only seems to occur at cold starts. At times the squeel is very load and can really hurt your ears. I have done all of the following and cannot figure out what the source is: 1. replaced water pump & hoses 2. replaced alternator 3. replaced belts 4. disconnected the air pump 5. disconnected power steering Anyone have any ideas on what the problem could be? Thanks

04-18-2009, 04:21 PM	#2
williej45 Registered User Join Date: Dec 2008 Location: Wahpeton ND Posts: 34	Re: mystery squeel at start up Tighten your belts. Sounds like they are the problem. __________________ Rule #1: If it's stupid but works, it's not stupid.

04-18-2009, 04:23 PM	#3
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,284	Re: mystery squeel at start up the belts may have been loose for a long time and have literally polished the pulleys so that before they get warmed up from the motor heat, they slip and squeal.. you need to take off the belts and use a real light emory cloth and just take the shine off the pulleys then re install your belts and tighten to the proper tension and your squeal should go away __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

04-18-2009, 09:15 PM	#4
13lazer 13lazers' blazers Join Date: Jul 2005 Location: San Pedro, CA Posts: 152	Re: mystery squeel at start up Yup I had the same problem. Make sure all of the required belts are installed. Sometimes the AC compressor binds up, make sure its turned off. __________________ 1970 2wd blazer 1972 1ton blazer 4x4 in progress 1966 mustang coupe (modified) 1985 c20 suburban tow rig 1996 462 ranger with a 150 efi merc. a former B.A.S.S. tournament boat almost all exempt from california smog laws intentionally.

04-18-2009, 10:00 PM	#5
silvereagle07 Registered User Join Date: Sep 2008 Location: Bailey, NC Posts: 2,462	Re: mystery squeel at start up You could always remove the belt and spin the pulleys to make sure there is no binding. While belts are removed start engine to verify the noise goes away. If the noise does go away remove the shine from the pulleys like Old Rusty said. I use a scotch brite pad (red). __________________ Jeramy '84 GMC project truck '85 Chevy 4X4 SOLD '07 Chevy Trailblazer SS 5th Annual SHPHC Car/Truck Show Pics http://67-72chevytrucks.com/vboard/s...d.php?t=543605 UPDATED PICS! CHECK 'EM OUT

04-18-2009, 10:55 PM	#6
3r!c84 Badass Join Date: Jan 2009 Location: lox. fl Posts: 4,586	Re: mystery squeel at start up old rusty is right i learned this back when i use to soup-up lawnmowers get them tight or they will howl like a dog until they heat up or when they get wet lol __________________ Think outside the box? -84c10 (1stcar)→My Build← -00 Saturn 5spd drop a gear and disappear! 1/4:13:90

04-19-2009, 02:03 AM	#7
pig rig Registered User Join Date: Feb 2009 Location: washington the state Posts: 730	Re: mystery squeel at start up spray belt dressing on them thats the easy way to find out if you need to pull the belts up to buff the pulleys __________________ my sports car rolls on six wheels only because I'm to fat to get in and out of new corvette http://hubgarage.s3.amazonaws.com/ph...ped_detail.JPG

04-19-2009, 07:10 AM	#8
78 Big10 454 78 Big10 454 Join Date: Jul 2008 Location: Pismo Beach, CA Posts: 838	Re: mystery squeel at start up Had the same problem in my truck. It was the A/C compressor.

04-19-2009, 07:24 AM	#9
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: mystery squeel at start up I've seen this many times.....fan clutch....replace it and problem solved. __________________ I'm on the Instagram- @Gearhead_Kevin

04-21-2009, 02:27 PM	#10
73chevyman Registered User Join Date: Nov 2008 Location: Lusby, MD Posts: 563	Re: mystery squeel at start up i just get some dish soap and squirt it on the belts makes it smell real good at start up if it's a belt squeal it should go a way then tighten all belts but i would say clutch fan, or ac compressor going __________________ http://67-72chevytrucks.com/vboard/group.php?groupid=37 73 C10 Fleetside If it ain't a Chevy it's foreign http://hotridesmag.com/



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