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serpentine belt ripping to shreds

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Old Jul 5, 2024 | 07:08 PM
  #1  
killerbean's Avatar
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Car: 88 GTA
Engine: 5.7 TPI
Transmission: 700r4
serpentine belt ripping to shreds

Hello all, I finally got my engine swapped and it's been running fairly good other than some idle problems and the belt.

I have replaced the belt 3 times and it just went again. The first time I thought it was the belt itself so I got a new one. The second time I thought it was one of the pulleys were rusted so I cleaned them up and put a new one on. The third time it went I thought it was the tensioner so I put a different tensioner on. Not a new one but a different one.

The belt just went again while driving it and now I think it could be one of two things but I wanted to get some input. Another thing to note the smog pump is gone. I have been using the dayco 5060968 belt. Each belt lasts probably 15 miles then it seems to go.

My thoughts are

1. The second tensioner I put on is also bad
2. The crank pulley isn't lined up right

Thanks in advance

Update:
I took the crank pulley off and knocked the balancer in farther. Looks to have lined up better and I have been driving it with no problems so far. I am not sure if it would have came off yet but it only time will tell.


Top down view of power steering pulley and crank pulley

Top down view of water pump pulley and crank pulley

Tensioner pulley

What's left of the belt (not much lol)

More mangled belt

Last edited by killerbean; Jul 12, 2024 at 03:31 PM. Reason: update
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Old Jul 5, 2024 | 07:24 PM
  #2  
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Re: serpentine belt ripping to shreds

Your pulleys are nowhere near lined up. It'll keep eating belts forever until you get that sorted.

Looks like the crank pulley is the one that isn't lined up. Looks to me like it's not driven all the way up onto the crank.

Might wanna verify that first. Like, try torquing the bolt, and see what happens. You should be able to put at least 50 ft-lbs on it (with the crank held still) without the bolt turning any more. Keep cranking on the bolt and see what happens but don't go overboard in gorilla mode. Wouldn't be a bad idea to pop it out first and grease the threads up real good. Spec for damper bolt torque is around 60 - 65 ft-lbs if memory serves, so don't go past 75 or so on it, to avoid stripping threads. If it won't go on any further, might want to pull it off and check for burrs and whatnot either on the crank, or in its bore. Again, grease the crank/damper mating surfaces before assembly, to make everything go together. Make it greeeeezzzy so it slides in eeeeeezzzy. (good life advice generally)
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Old Jul 5, 2024 | 07:41 PM
  #3  
killerbean's Avatar
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Car: 88 GTA
Engine: 5.7 TPI
Transmission: 700r4
Re: serpentine belt ripping to shreds

Originally Posted by sofakingdom
Your pulleys are nowhere near lined up. It'll keep eating belts forever until you get that sorted.

Looks like the crank pulley is the one that isn't lined up. Looks to me like it's not driven all the way up onto the crank.

Might wanna verify that first. Like, try torquing the bolt, and see what happens. You should be able to put at least 50 ft-lbs on it (with the crank held still) without the bolt turning any more. Keep cranking on the bolt and see what happens but don't go overboard in gorilla mode. Wouldn't be a bad idea to pop it out first and grease the threads up real good. Spec for damper bolt torque is around 60 - 65 ft-lbs if memory serves, so don't go past 75 or so on it, to avoid stripping threads. If it won't go on any further, might want to pull it off and check for burrs and whatnot either on the crank, or in its bore. Again, grease the crank/damper mating surfaces before assembly, to make everything go together. Make it greeeeezzzy so it slides in eeeeeezzzy. (good life advice generally)
I'll have to take it apart tomorrow. I did torque to balancer bolt to 60 ft-lbs when I put it on.

Appreciate the feedback.
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