tensioner used on Front runner
 

Hi Anyone know what the part number is for the LS version of the Vintage air front runner?
It's not listed on the sight only the covers are. I called support and they told me the reason the belt might be jumping off track is possibly due to a to a bent tensioner. They gave me another thing to try but just i case I want to have one on hand. I want to buy a replacement and they appear to be OEM GM.

Is it jumping a rib on the ac compressor?

Yes that is exactly what its doing on the inside rib (toward firewall).. However the pump hasn't been fully pulled into the the aluminum spacers. just hand tight..
BTW this happened while cranking.. not running.. was just priming the motor..

Never happen before, but they said if someone gorillas the tensioner without a tool it could be bent. the tensioner cover pretty much prevent you from using the tool.. and its a PIA to get on and off.

Tighten everything properly before buying more parts and changing belt alignment. My Kwik AC bracket I had to shim the bottom two bolts with a thin washer bc over time the pulley wears down causing it to go at a slight angle and creating belt walk and squeak.

Let me see your set up. I think I remember someone before using a Toyota tensioner but that was on a Magnuson kit

make sure your balancer is fully seated.

Following up. The AC compressor has a pair of spacers. When I took the compressor off the last time to install the new water inlet housing... I mixed them up .. front to back..

Switched them back correctly and were in business.