Crankshaft Pulley

[sandcobra164]

I picked up a M1045A2 for a member on here. Installed batteries, got it running but 30 minutes later the crankshaft pulley decided it was no longer part of the team. It is an 8 rib drive pulley on a serpentine accessory drive. Is this a HMMWV specific part or can I go to NAPA and provide a part number that one of you fine members will provide? I saw one on ***Pay for $198.00 but I think there has to be a civilian equivalent for cheaper. The harmonic balancer is fine, just need the pulley and drive flange as they have seperated.

 

[sandcobra164]

Part Number is 12460262, NSN 3020-01-442-7485. The civilian equivalent will not work because it only has 6 grooves instead of the 8 on a HMMWV with a serpentine belt accessory drive.

 

[Retiredwarhorses]

Part Number is 12460262, NSN 3020-01-442-7485. The civilian equivalent will not work because it only has 6 grooves instead of the 8 on a HMMWV with a serpentine belt accessory drive.

you are stuck buying from a distributor....I’ve seen them on eBay used for sale.
its the 8 rib belt that makes it hard to find.

 

[tage]

No snappy of crank?

 

[sandcobra164]

Negative, it was idling. First start in who knows how many years, I just towed this truck home from auction. I would caution at this point that everyone check theirs for piece of mind.

 

[cwc]

How about a picture showing how it came apart? Is it possible to weld it back together?

Sent from my E6910 using Tapatalk

 

[Retiredwarhorses]

How about a picture showing how it came apart? Is it possible to weld it back together?

Sent from my E6910 using Tapatalk

The pulley is rubber isolated...this is a wear item requiring replacement, same as a crank harmonic balancer.
it is in no ones best interest to try and repair it...

 

[sandcobra164]

In the pictures you can see the rubber still attached to the hub / flange assembly. The pulley unbonded from the rubber over the course of time. Sarge will keep him company until he's fixed and his owner sends transport for him.

 

[gimpyrobb]

Well if the pulley went bad, the harmonic balancer can't be too far behind.

 

[Retiredwarhorses]

Your lucky it happend at idle...replace both and thank me later.

 

[sandcobra164]

Gimp, you make a great point along with RetiredWarHorses. I'll advise the owner and hopefully proceed with installing a new balancer and crank pulley. I now know the pulley is HMMWV specific, is the balancer HMMWV specific as well? I want to make sure I provide the correct solutions to the problem and send this thing to Tennessee in good shape. If it were mine I know I'd replace both, hopefully the owner agrees.

 

[Retiredwarhorses]

Balancer is Civilian, but 6.2 and 6.5 are different...just make sure to buy an AC Delco HB, don’t use Dorman.

 

[Keith_J]

See if these folks can rebuild it: https://damperdoctor.com/index.php?route=information/information&information_id=4

This is just a secondary damper to protect the accessories driven off the serpentine belt. Excessive torsional acceleration causes serpentine belt tension to oscillate which reduces accessory bearing life. Even with auto tension serpentine belts, especially on diesels as the pistons come to a crashing halt due to high compression and when the cylinder fires, that knocking is a sudden crank acceleration.

 

[Retiredwarhorses]

See if these folks can rebuild it: https://damperdoctor.com/index.php?route=information/information&information_id=4

This is just a secondary damper to protect the accessories driven off the serpentine belt. Excessive torsional acceleration causes serpentine belt tension to oscillate which reduces accessory bearing life. Even with auto tension serpentine belts, especially on diesels as the pistons come to a crashing halt due to high compression and when the cylinder fires, that knocking is a sudden crank acceleration.

Why? A new HB is under $150 or so...

 

[Keith_J]

Why? A new HB is under $150 or so...

I was talking about the pulley. HBs are available commercially.

 

[sandcobra164]

Pictures attached from what came off including a piece it back together picture. This part has failed, the civilian market replaces it with a solid billet pulley without the rubber "dampener" ring. The idea behind the rubber ring is to dampen the shock created by the diesel combustion event which extends the life of accessory components driven by the crank pulley.

 

[86humv]

I might have an NOS one...I'll look

 

[sandcobra164]

86 hmmwv,
Sir, no need to look. The owner of the truck purchased one on an online auction site and sent it to me. The truck is repaired now. I posted the pictures to help with the discussion of "can it be rebuilt". One side offered up a vendor that could possibly repair it and the other side stated it is a wear item that should be replaced with new. I have no dog in the fight as I don't own a HMMWV. I just have one out here that I picked up for a fellow SS Member that needed some work.