C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Air Pump Pulley Question!

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Old Sep 24, 2009 | 05:25 PM
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F0RMULA's Avatar
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From: west chester pennsylvania
Default Air Pump Pulley Question!

1987 4+3 coupe.


i noticed a noise under the hood yesterday, sounds like the bearing in the air pump pulley has about had it.

advance auto has these when i typed in 'air pump pulley'

http://shop.advanceautoparts.com/webapp/wcs/stores/servlet/product_Pulley-Factory-Air_5899575-P_806_R%7CGRPBELTAMS_285390610___


and


http://shop.advanceautoparts.com/web...S_285398920___



is this what i need? they have a hole through both sides, while the pulley on my car is flat with 3 bolts on the front side.



is this the right part? where can i get the correct part?


thanks in advance!
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Old Sep 24, 2009 | 07:19 PM
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On my 87 I had to purchase a new smog air pump and change the pulley over to the new unit. The pulley bolts to the pump and the bearing that is giving you trouble located inside the pump. The pump is a non servicable item. I bought the replacement pump from advance auto, its a rebuilt unit from carbone.

Hope this helps
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Old Sep 24, 2009 | 09:17 PM
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The rear bearing can be replaced. Removing the back cover gives you direct access to it. It pulls out and presses in. Also, the internal air fins in there can also be a source of noise. Those too can also be removed from behind after you take out the rear bearing. The front bearing did not appear to be replaceable when I had mine taken apart.

That pulley in the link does not even resemble anything on this pump to me.

Last edited by 86PACER; Sep 24, 2009 at 09:20 PM.
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Old Sep 25, 2009 | 08:50 AM
  #4  
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From: Santa Maria, CA
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Originally Posted by F0RMULA
1987 4+3 coupe.


i noticed a noise under the hood yesterday, sounds like the bearing in the air pump pulley has about had it.

advance auto has these when i typed in 'air pump pulley'

http://shop.advanceautoparts.com/webapp/wcs/stores/servlet/product_Pulley-Factory-Air_5899575-P_806_R%7CGRPBELTAMS_285390610___




http://shop.advanceautoparts.com/web...S_285398920___



is this what i need? they have a hole through both sides, while the pulley on my car is flat with 3 bolts on the front side.



is this the right part? where can i get the correct part?


thanks in advance!
That part looks like an idler pulley.

My smog pump is also making noise. The FSM says they are sealed and are not serviceable. I bought a new (rebuilt) smog pump from Napa yesterday.
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