Noisy belt

gtzero · 12-13-2007

Hi Everyone,

I'm in need of advice again. I finally got my car back from the bodyshop where it sat for over a year. After Gil helped me with diagnosing a leaking injector, I found out that the car screams (literally) once rpms exceed 4000.

All the belts are tight. Might this just be a case of it sitting so long? Maybe I just need to drive the car?

What do you all think? Thanks in advance,

Manny

namba209 · 12-13-2007

I hate to say it Manny, but it could be a bearing in the alternator or water pump going south. Not a good thing. You could possibly try a rust inhibitor behind the alternator pulley in the hope it will wick in to the bearing. HTH.

timemachine · 12-13-2007

Manny,

Depends on what you mean by "screams." Your thread was about a noisy belt. You can fix that easy enough with a replacement. Or, you can do the old trick of putting a dab of grease on a screwdriver and touching it to the belt on either side (don't do this where it can kick or get caught). You should be able to flex the belt a little with your thumb.

Try and determine if the sound isn't coming from the engine. They tend to blow up more than scream, but make sure it's fully oiled. Make sure the mounts are intact and the fan isn't rubbing the shroud. A high rev noise can also come from a water pump or alternator bearing or distributor. Make sure they are all turning. You should be able to listen around to isolate it.

Jim

dallasmanta · 12-13-2007

an old third world country trick was to take a bar of soap and let it rub against the belt with the engine running. If this fixes the screaming then it is time to replace the belt. If is does not fix the screaming then it is more than likely the alt bearing on the front under the pully. Save yourself the aggrivation and take it to a shop that can press the bearing out and replace it . If the noise is from the water pump, it will leak about same time as the noise starts most of the time. Ron

hrcollinsjr · 12-14-2007

Originally Posted by dallasmanta

an old third world country tick was to take a bar of soap and let it rub against the belt with the engine running. Ron

So THAT'S how they use their soap.

Harold

gtzero · 12-14-2007

Thanks Everyone. I used "belt" because I've heard belts sound like that. But it might not be the belt as some of you have suggested. I'll poke around with a hose to try to locate the source of the "scream".

Thanks again

tomking · 12-14-2007

Take the belt off and run it up to 4K RPM and see if the noise is gone. If gone its at least the belt, the alternator or the water pump.

gtzero · 03-25-2008

It turns out it was the water pump. Thanks everyone for your help. Now I'm back to happily accelerating to redline.

12-13-2007	#1 (permalink)
gtzero Member Join Date: Mar 2003 Posts: 462	Unanswered: Noisy belt Hi Everyone, I'm in need of advice again. I finally got my car back from the bodyshop where it sat for over a year. After Gil helped me with diagnosing a leaking injector, I found out that the car screams (literally) once rpms exceed 4000. All the belts are tight. Might this just be a case of it sitting so long? Maybe I just need to drive the car? What do you all think? Thanks in advance, Manny

12-13-2007	#2 (permalink)
namba209 6,000 Post Club Join Date: Aug 2002 Location: Imperial Beach, CA South of San Diego Posts: 6,054 Provided Answers: 6	I hate to say it Manny, but it could be a bearing in the alternator or water pump going south. Not a good thing. You could possibly try a rust inhibitor behind the alternator pulley in the hope it will wick in to the bearing. HTH. __________________ Ron 72 GT 3.4L V-6/T-5/ZF posi - almost done - Just need AC installed. 75 Chevy monza 5.7L/TH350/Auburn 3.08 posi - Next

12-13-2007	#3 (permalink)
timemachine Member Join Date: Jan 2006 Location: Swarthmore, PA Posts: 871 Real Name: Jim Provided Answers: 7	Manny, Depends on what you mean by "screams." Your thread was about a noisy belt. You can fix that easy enough with a replacement. Or, you can do the old trick of putting a dab of grease on a screwdriver and touching it to the belt on either side (don't do this where it can kick or get caught). You should be able to flex the belt a little with your thumb. Try and determine if the sound isn't coming from the engine. They tend to blow up more than scream, but make sure it's fully oiled. Make sure the mounts are intact and the fan isn't rubbing the shroud. A high rev noise can also come from a water pump or alternator bearing or distributor. Make sure they are all turning. You should be able to listen around to isolate it. Jim __________________ '74 Manta ("Sig") '75 Sportwagon (project) '72 GT (whenever I get to it) Sold or wrecked: '72 Manta Rallye '73 Manta '74 Luxus

12-13-2007	#4 (permalink)
dallasmanta Dallasmanta Join Date: Feb 2003 Location: dallas texas Posts: 189 Real Name: Ron	an old third world country trick was to take a bar of soap and let it rub against the belt with the engine running. If this fixes the screaming then it is time to replace the belt. If is does not fix the screaming then it is more than likely the alt bearing on the front under the pully. Save yourself the aggrivation and take it to a shop that can press the bearing out and replace it . If the noise is from the water pump, it will leak about same time as the noise starts most of the time. Ron Last edited by tekenaar; 12-14-2007 at 10:49 AM. Reason: country tick . . . time for some bug spray?

12-14-2007	#7 (permalink)
tomking tomking Join Date: Aug 2002 Location: SW Missouri Posts: 1,287	Take the belt off and run it up to 4K RPM and see if the noise is gone. If gone its at least the belt, the alternator or the water pump. __________________ TMK

12-14-2007	#6 (permalink)
gtzero Member Join Date: Mar 2003 Posts: 462	Thanks Everyone. I used "belt" because I've heard belts sound like that. But it might not be the belt as some of you have suggested. I'll poke around with a hose to try to locate the source of the "scream". Thanks again

03-25-2008	#8 (permalink)
gtzero Member Join Date: Mar 2003 Posts: 462	It turns out it was the water pump. Thanks everyone for your help. Now I'm back to happily accelerating to redline.

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