Idler pulley sourcing

[Djmech26]

I’m wondering if anyone can help source an idler pulley for a 2019 Sierra SLT, part #12720530. I need to replace my serpentine, and the part is back ordered everywhere, GM and third party brands (Napa, gates, etc.). 

 

[calgator73]

10 hours ago, Djmech26 said:

I’m wondering if anyone can help source an idler pulley for a 2019 Sierra SLT, part #12720530. I need to replace my serpentine, and the part is back ordered everywhere, GM and third party brands (Napa, gates, etc.). 

 

Check rock auto

[Djmech26]

Thank you! Image doesn’t match (smooth as opposed to grooved) but specs look good, and it does list the part number I need.  I’ll give it a shot! 

[oldmann]

Do you know the truck uses a stretch belt method?  There is no way to release the idler like the older trucks.  

[Djmech26]

Correct, I’m doing a belt and idler replacement. 

[EXSlider400]

Same issue. Have to also look at newer part numbers that replaced the one that came on the vehicle. Replaced my OEM 55581830 with 12720530. Reused a washer from the factory one just to keep it the exact same…May have been ok without switching it. To remove the belt I just loosened the idler bolt and used a screw driver (any tool with smooth leverage would work) and turned the engine by hand clockwise. Always disconnect battery before doing this. 

 

 

Edited January 4, 2024 by EXSlider400

[EXSlider400]

Also as extra insurance for some longer trips I have soon, I bought a used alternator from eBay from a crashed truck with 20k miles in great shape for $85 because I could not find any reasonable ones from GM. Normally I would just bring some extra brushes and regulator…but for under $100 bucks I am getting too old for that. Now changing the alternator requires a T15 to move the electric radiator fan out the way to. 
 

 

Edited January 4, 2024 by EXSlider400

[EXSlider400]

Also added an extra grounding strap due to this:

 

 

[EXSlider400]

Sorry for all the post….but trying to be helpful. Did the zip tie trick and all worked great. 
 

 

[Tayman174]

What is the torque spec for the idler pulley bolt??