I have replaced the belt on my 2004 RX330 and it needs to be retightened every 4-7 days of driving. This is the belt that does the alternator and the AC. At first I figured it was settling in. But after doing this about 12 times over the last 3 months something cant be right. Im afraid Im going to run down the tightening screw to the bottom. It is a "Gates" belt which i thought was a good brand. why does it keep stretching?? I know my engine isn't "Growing"
Anyone else experience this?? should I get a better belt?
It always stops the squeaking just fine for the first few days, but then it happens all over again.
to note: I am making sure all three screws are tightened well after each adjustment.
It takes about 2-3 turns of the adjustment screw to get it tight enough again each time I tighten the belt.

HELP!!!!

 

Have you inspected the belt and pulleys for glazing that might be the cause of the slippage vs a loose belt?

 

If you have not done so, I would try some belt dressing. Good at improving grip and removing squeals.

 

Bolt A. 43 ft lbs
Bolt B. 13 ft lbs

 

Thank you the belt dressing helped some. Appreciate the tip