Need help

[Flower$]

Hi I'm new here an having trouble with my 05 GMC Duramax. The serpentine belt keeps running off the harmonic balancer. I have changed all the idler pulleys, tensioner an am about to change the power steering pump. Does anyone now why this is happening? Thank you for your time

Roy

 

[LEBKMDURAMAX]

If it is routed correctly I don't understand how it could slide off the balancer ,never heard of it.

 

[motoking_1990]

Is the damper wobbling really bad?

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[Awenta]

If you can grab the balancer and move it I have bad news for you.

How quickly does it come off? Maybe shoot a quick video of the motor running.

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[motoking_1990]

If you can grab the balancer and move it I have bad news for you.

How quickly does it come off? Maybe shoot a quick video of the motor running.

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Exactly what I was thinking. Let's hope not. Too much of that going around.

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[rfletes79]

I've had a power steering pulley start to come off cause this issue. You might find something going on there when you look.

 

[Dirtymaxx03]

I had alot of trouble keeping the belt on after i replaced my tensioner with an autozone brand tensioner. Switched to an OEM tensioner from the dealership and the problem went away. The tensioner from autozone was allowing the belt to jump off when i got in it real hard and the rpms jumped real high real quick.

 

[Flower$]

I know it's really weird but everything is routed right I even bought a tentioner from the GMC dealer. the balancer is spinning smoothly. The only thing I can see an issue with is a little play in the power steering shaft. it moves in an out a bit but I'm not sure if it's enough to cause this. The pulley spins smooth too. The belt runs off center on the fan pulley tward the front even before it gets to the balancer

 

[1ATony]

Thanks for joining Roy, it's great to have you here

Tony :rockon:

 

[Flower$]

Thank you! I finally found the problem i was having with my serpentine belt. i narrowed it down to the power steering pump an pulley. lol a couple hundred bucks later

 

[motoking_1990]

Awesome!! glad it wasn't the alternative. Could've been a lot more expensive.

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