Washer, Harmonic Balancer

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May 27, 2023 | 07:07 AM

PlymouthBarracuda

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From: USA, Maine

Washer, Harmonic Balancer

Could anybody help to find the correct part number of the crank pulley Washer ? After removal crankshaft balancer it's washer became unserviceable.
I searched everywhere and can't find the PN to order.
I ordered new GM crank pulley but it came without the washer.
Now I have oil leak from the front crankshaft seal....

2011 chevy camaro L99 6.2 auto transmission

I ordered PN 12578073 that is very similar but it's too small physically. I attach image

May 27, 2023 | 10:15 AM

QwkTrip

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Bolt is not reusable, so you need a new bolt too. Just get a bolt and washer kit from summit racing or anywhere.

May 27, 2023 | 12:33 PM

PlymouthBarracuda

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Quote:

Originally Posted by QwkTrip

Bolt is not reusable, so you need a new bolt too. Just get a bolt and washer kit from summit racing or anywhere.

Finally I found it, genuine PN from GM is 12603843 (old version is 12600525)

Last edited by PlymouthBarracuda; May 27, 2023 at 12:51 PM.

May 27, 2023 | 01:06 PM

PlymouthBarracuda

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Could anybody help to find seller of the pn 12603843 or 12600525 ?))

May 27, 2023 | 02:15 PM

G Atsma

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Quote:

Originally Posted by PlymouthBarracuda

Could anybody help to find seller of the pn 12603843 or 12600525 ?))

To reiterate the post above, buy BOTH the bolt and washer as a set from Summit or almost anywhere else.
The bolt is NOT reusable.

May 31, 2023 | 09:29 AM

LS1Formulation

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It's literally $30 for a reusable ARP bolt and washer. Just buy it and be done with it.

May 31, 2023 | 09:15 PM

PlymouthBarracuda

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Quote:

Originally Posted by LS1Formulation

It's literally $30 for a reusable ARP bolt and washer. Just buy it and be done with it.

yes, thank you, but GM don't produce anymore 12603843 or 12600525 and Summit Racing have zero in stock.

new washer part number is 12674588 and I have new GM bolt .

Last time I installed this pulley by tightening a bolt, however I have seen it installed by heating