sleepy_boy1

ill keep it short. truck is used for uphill sand climbs. 2004 silverado keeps dropping fanbelt at 6300rpm... any ideas.. or upgrades i should consider? its a manual trans if that help in any way..

ZDER

iTrader: (3)

Did you check the tensioner? If an upgrade maybe a 8 rib pulley system?

1lejohn

iTrader: (9)

I've also had the balancer pulley come loose and cause the belt to come off.

sleepy_boy1

i have changed tensioner and belt, and i have checked all the pulleys... its only comes of at fuel cut...

KRAZY K 2000 TA

iTrader: (5)

i had to put an aftermarket tensioner on mine to stop it from coming off

RsSean

iTrader: (27)

I would try a manual belt tensinor

S10xGN

iTrader: (11)

Sounds like you need to adjust your driving style...

LS1MCSS

iTrader: (18)

That was my thought too. Maybe try shifting sooner, or have the fuel cutoff raised.

1lejohn

iTrader: (9)

Thats funny. You could try a slightly shorter belt. But

soundengineer

iTrader: (16)

I've always had issues with the stock tensioner and going over 6200....
get a manual tensioner... stock tensioner wasnt meant to handle the vibrations of high rpms...
also, if you have an underdrive pulley... it will amplify it and make it a lot worse than somebody with a stock pulley size.

S10xGN

iTrader: (11)

If it is actually a fuel cutoff and the engine is under load, you could easily smoke a piston. Hopefully, it's a spark limiter. Anyways, not good to be up against any kind of rev limiter. The manual tensioner will help...

soundengineer

iTrader: (16)

Wrong...
The fuel limiter is much safer than a spark limiter...
Lean mixtures don't happen with a fuel cut off... its a zero mixture...which means no combustion and no pressure

Damage comes from a spark limiter... the fuel loads up and you get combustion at the wrong time...typically you get exhaust light off, which will blows up your exhaust pipes... it can also damage valves... and ocassionally you get the intake popped off.....

soundengineer

iTrader: (16)

Also, it is not possible to smoke a piston from a fuel limiter... It will pop and spotter, but it doesn't damage anything except for your ego...LOL