Anyone happen to have access to the gm part numbers for the new 6.6L LT8 accessory drive and water pump? It uses a power steering pump as well as center mount “LS” style water pump. Figured be cheaper to get the LT8 setup vs spending $400 on the LT to LS waterpump brackets. $300 for brackets and $100 for pump too.

 

OTE=Bo185;20256330]Anyone happen to have access to the gm part numbers for the new 6.6L LT8 accessory drive and water pump? It uses a power steering pump as well as center mount “LS” style water pump. Figured be cheaper to get the LT8 setup vs spending $400 on the LT to LS waterpump brackets. $300 for brackets and $100 for pump too.[/QUOTE]
part number for pump same as 6.6 diesel 84768806 an 84586218. As for bracket 12654286
pulley is same for all truck applications

 

PS pump bracket is 12654286 and comes with the bolts to attach it to the head.

PS pump to bracket bolts 11588725 x3

PS pump Pulley 12682902

PS pump abs reservoir is not the same as the 6.6 duramax, it’s exclusive to the L8T 6.6
84768806

2019+ L84/L87/L8T water pump assembly 12687631

also for reference if your doing a swap into an older truck the gen3/4 style 4 wire alternator bolts right into the 19+ alternator mounts.

 

L8t power steering pump bracket

12654286

Factory power steering pump bracket.

 

Sorry about digging up an old thread.....

I have a new L87 long block that I need to add the accessory drive to. The L87 utilizes the same water pump as the L8T. Most of the part numbers to get me there are already posted within this thread. However, I do not have the part numbers for the idler pulleys and tensioner for the L8T accessory drive. Does someone here have that information handy? Also, what is the part number for the belt that is used (assuming the power steering pump listed above is used)?

Lastly, I also need all of the part numbers to mount the A/C pump/compressor. Any help there, too?

Thanks!

 

check ICT billet?

 

Checked "previously owned part emporiums" (AKA junkyards...)?

 

I haven’t seen the 6.6 gasser in person yet, but the pictures I’ve seen show two alternators?

 

I've seen pictures of L8T configures with one alternator and with two alternators. There must be an option package that upgrades the charging system.

 

The dual alternator is a option also with dual batteries. When I ordered my 2021 GMC 3500hd reg cab I did not check that box.

 

Here is pic with only one alternator.

 

It's hard for me to narrow down the exact parts because my system pulls up every engine available for a truck. If I had a VIN that came with 6.6 gasser, it will give me exact parts. We've only had a few here at my dealership. It's nice to be in parts dept now vs turning wrenches.

 

Here's a VIN number for a 2021 Silverado 2500HD with the 6.6 gasser, single battery and alternator. Can you post the parts breakdown for the tensioner and idlers? Thanks!!

 

Good to know. I’ve seen 2500 trucks, both gas and duramax with dual batteries, but I’ve never seen one with dual alternators. I thought it might be unique to the L8T, from the pics I’ve seen, but I see now it’s an option.

 

No VIN. I just need the last 8 of the VIN. But can't do it till Monday.

 

Sorry about that.....
The last 8 digits are MF318388

 

silly question - how is the belt removed/replaced?

Is the alternator pivoted to allow this?

 

I have the same question. The accessories themselves are in a fixed position on the production engines. Belt tension comes from a stand-alone belt tensioner. I'm starting to wonder if the accessory configuration in this picture actually exists on a production vehicle or is it an artist's rendering? The pulley on the far side of the image is where the power steering pump would be on a production vehicle and it doesn't appear to be a tensioner pulley (or at least not one I've ever seen). Instead, the picture seems to depict a fixed idler pulley. I like the simplicity of what is shown, but without a snubber/tensioner pulley I don't think it would work. Also, I'm no expert on any of this.....I'm just trying to figure it all out like the rest of us....lol.

 

The belts are a stretch type, one time use belt. Supposed to be replace if removed. Does it really have to. No, but GM says to.

 

posting a pic of diagram. Hopefully it comes out right. Now this is based off his VIN but with VIN filter off. so it pulls up more than what his truck came with. But if someone is planning to add a dual Alt, Keep in mind the harness may not be wired for it to control the regulator.