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Hey, guys and gals!
I was having an issue with my 1997 Toyota Landcruiser 80 series with the 1hz engine. Any time the engine would rev over about 1500rpm the Airconditioning drive belt would spin and flick off the drive pulley. After checking the alignment of the pulleys, tensioner pulley and A/C compressor pulleys I found no issues at all. The drive belt tension was good and everything was in good working order and properly aligned.
The final piece to the puzzle is the Crank A/C drive/balancer pulley. After using a mirror to inspect the balancer pulley I found multiple large cracks/splits in the rubber coupling.
I removed all the belts and removed the front part of the 2 piece crank harmonic balancer for the A/C drive. After a proper look, there was definitely some good cracks and separation of the rubber from the pulley. I think that under higher RPM the age and cracks through the rubber coupling of the pulley were causing it to spin incorrectly/vibrate and would cause the A/C drive belt to spin and jump off the pulley.
I replaced the Airconditioning drive pulley/balancer off the crank and reassembled with a new genuine belt. After 500km of testing the belt has not come off again.
If you are experiencing troubles with your drive belts jumping off pulleys I would recommend checking everything listed above.
Hope this may help some people!
Cheers, Nicko!
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