alternator pulley keeps coming off. WTF???

[geabis]

anyone else have dual alternators with a problem of the aux alternator pulley loosening and coming off to leave you stranded with out power steering or brakes. i have to take it in for the second time in 3 months for the problem. first time it happened 1k miles after tuning it this time it happened about 100miles within tuning it. could it have something to due with the spartan? too much throttle response or engine decelerating too quick?

also does anyone know if that belt operates the water pump bc i can drive without steering or brakes, but i dont want to over heat the motor

[Big Angry Hillbilly]

The accessory belt that gets thrown off also drives the water pump.

[geabis]

Originally Posted by Big Angry Hillbilly

The accessory belt that gets thrown off also drives the water pump.

thanks.

still trying to figure out if this is unique to me or if other people are having the same problem. the design of the primary alternator and secondary alternator pulleys are different the secondary looks as if its a threaded pulley threaded on to the shaft and the primary has a nut holding it.

this has happened twice in a row. the first time happened around 1k miles of me tuning the truck aprox 5k total on the truck and the second happened about 100 miles after i tuned it but aprox 1k miles after it was fixed. i know there is a considerable difference in throttle response on a tuned truck vs stock and just wondering if the decel of the throttle response could loosen the pulley?

hell I'd tack weld the damn thing if i knew for sure it was going to happen again. really i don't think i would ever replace the pulley with out putting an alternator on it. so far its been a warranty replacement but its getting to be an inconvenience not having a truck fro a week for a damn alternator

[Beatngu]

17k on my truck and my pulley just came off my alternator , Ford says you can't buy just the pulley ?
anyone have more on this? I don't want to buy a new alternator just for the pulley