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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 05-14-2015, 03:00 PM   #51 (permalink)
dieselmike1
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Originally Posted by Smallengineguru View Post
Update: when the truckk won't go over 500 rpms. I hear a belt squeal, sure as S*** belts slipping, tach is ran by alternator on this truck, so would that account for power Loss and weird stuff going on with my turbo? As if the PCM used rpm pulses from the alt to dictate boost pressure..?
No, the pcm gets it's rpm reading's from the crank sensor.

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Old 05-16-2015, 10:32 PM   #52 (permalink)
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Fixed it!!! Turns out something weird was happening when the belt was slipping that was killing my power/tach etc new belt fixed it right up, except now my belt falls off the crank pulley on startup, ordered a new tensioner, hopefully that fixes it.

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Old 05-16-2015, 11:03 PM   #53 (permalink)
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Did you get the correct size belt?
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Old 05-16-2015, 11:15 PM   #54 (permalink)
dieselmike1
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Originally Posted by Smallengineguru View Post
Fixed it!!! Turns out something weird was happening when the belt was slipping that was killing my power/tach etc new belt fixed it right up, except now my belt falls off the crank pulley on startup, ordered a new tensioner, hopefully that fixes it.
If that truly fixed it, that's great! I cant figure out what that would have to do with the problems you described. Keep us posted if you have any more problems.
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Old 05-17-2015, 02:54 AM   #55 (permalink)
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Delco5061010 from autozone, it fell off and then I put it back on and had my buddie start it, it stays on if ur just turning It over with the starter but as soon as it fires, it falls off the crank pulley towards the engine really odd.
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Old 05-17-2015, 11:59 AM   #56 (permalink)
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I hate to ask such a basic question , but is the belt installed/routed correctly?

1997 Serpentine Belt Diagram.jpeg.jpg

Are all the pulleys aligned? You can check this with a straight edge.
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Old 05-17-2015, 02:07 PM   #57 (permalink)
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Unfortunitely yes, m installing the belt tensioner today hopefully that resolves it.
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Old 05-17-2015, 10:47 PM   #58 (permalink)
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Haha the new belt stretched instantly but it hasn't fallen off so it's good enough for me ����������
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Old 05-18-2015, 11:20 AM   #59 (permalink)
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Belt quality is not what it used to be.
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