Gawd Awful Screech - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**geunther** · 09-12-2015, 12:47 PM

I have a high pitched squall which sounds like a slipping belt. I put new belts on, tightened em up as they are supposed to be, but it still screeched right after the engine being started, then it stopped. It would also do it running about 40mph and accelerating hard when the transmission downshifted. I finally removed the belts and the screech went away. I know I had them to the correct tightness.

When I spin the water bump by hand it groans and sounds like in injured goat. I am wondering if under a quick throttle pump the water pump would provide enough initial resistance to cause the belt to slip. I suppose the right thing to do is to rebuild the water pump.

Just wondering if anyone had experienced this and if replacing/rebuilding the water pump helped the belt noise.

Wizo · 09-12-2015, 01:14 PM

I personally think that if your pump i making that noise just spinning it by hand, something is really wrong with it. Its probably about to fail. Sounds like the bearings are worn out. Is it weeping from the hole on the bottom of it? If there is any moisture there or drip stains, its seen better days. Do your self a favor and don't buy a cheap piece of junk replacement.(thats cheap insurance advice) Winters coming so make sure your antifreeze is up to snuff also. Hope this helps.

**geunther** · 09-12-2015, 01:26 PM

That was my guess too, bearings. Pump performs fine, engine runs cool, no leakage, no seepage or anything. But I agree, failure is not an option. i want to keep the factory cast numbers so will rebuild if I can.

Wizo · 09-12-2015, 01:30 PM

check the forum search to see if anybody here has done it before. Im sure somebody has.

1968aj · 09-12-2015, 03:41 PM

I just dealt with the same problem. went back and read all threads about belt squeal. anyway mine was the fan clutch. replaced clutch and everything is quiet again

mike16 · 09-12-2015, 06:39 PM

I had a terrible screetch comming from the rear of my truck. I devorced her and the noise went away too.

toolboxchev · 09-12-2015, 09:02 PM

Quote:

Originally Posted by mike16

I had a terrible screetch comming from the rear of my truck. I devorced her and the noise went away too.

Nice truck, I want one like that.

09-12-2015, 12:47 PM	#1
geunther Senior Member Join Date: Apr 2005 Location: Cheyenne, WY Posts: 740	Gawd Awful Screech I have a high pitched squall which sounds like a slipping belt. I put new belts on, tightened em up as they are supposed to be, but it still screeched right after the engine being started, then it stopped. It would also do it running about 40mph and accelerating hard when the transmission downshifted. I finally removed the belts and the screech went away. I know I had them to the correct tightness. When I spin the water bump by hand it groans and sounds like in injured goat. I am wondering if under a quick throttle pump the water pump would provide enough initial resistance to cause the belt to slip. I suppose the right thing to do is to rebuild the water pump. Just wondering if anyone had experienced this and if replacing/rebuilding the water pump helped the belt noise. __________________ The lid is stuck on my jar of anti seize

09-12-2015, 01:14 PM	#2
Wizo Registered User Join Date: Dec 2012 Location: Tacoma WA Posts: 274	Re: Gawd Awful Screech I personally think that if your pump i making that noise just spinning it by hand, something is really wrong with it. Its probably about to fail. Sounds like the bearings are worn out. Is it weeping from the hole on the bottom of it? If there is any moisture there or drip stains, its seen better days. Do your self a favor and don't buy a cheap piece of junk replacement.(thats cheap insurance advice) Winters coming so make sure your antifreeze is up to snuff also. Hope this helps. __________________ 1970 3/4 ton long box GMC !968 C10 short stepside (Papa's Old Lorry) 2006 2500 HD Silverado Duramax/Alison

09-12-2015, 01:26 PM	#3
geunther Senior Member Join Date: Apr 2005 Location: Cheyenne, WY Posts: 740	Re: Gawd Awful Screech That was my guess too, bearings. Pump performs fine, engine runs cool, no leakage, no seepage or anything. But I agree, failure is not an option. i want to keep the factory cast numbers so will rebuild if I can. __________________ The lid is stuck on my jar of anti seize

09-12-2015, 01:30 PM	#4
Wizo Registered User Join Date: Dec 2012 Location: Tacoma WA Posts: 274	Re: Gawd Awful Screech check the forum search to see if anybody here has done it before. Im sure somebody has. __________________ 1970 3/4 ton long box GMC !968 C10 short stepside (Papa's Old Lorry) 2006 2500 HD Silverado Duramax/Alison

09-12-2015, 03:41 PM	#5
1968aj Registered User Join Date: Apr 2009 Location: houston texas Posts: 1,438	Re: Gawd Awful Screech I just dealt with the same problem. went back and read all threads about belt squeal. anyway mine was the fan clutch. replaced clutch and everything is quiet again

09-12-2015, 06:39 PM	#6
mike16 Registered User Join Date: Dec 2009 Location: bisbee, arizona Posts: 1,529	Re: Gawd Awful Screech I had a terrible screetch comming from the rear of my truck. I devorced her and the noise went away too.



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