LBZ: AC compressor clutch needs whack to work. [video] - Diesel Place : Chevrolet and GMC Diesel Truck Forums
 
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Old 07-26-2019, 01:21 PM   #1 (permalink)
JoggerFogger
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AC compressor clutch needs whack to work. [video]

Did all normal tests to figure out why my AC is warm. Power goes to clutch, but clutch doesn't engage unless I whack it with something.

I believe I'll be ordering a new clutch assembly, but just wanted to show this off and see if anyone had a different solution. Kind of a PITA to pull over every 10 min and whack it into submission.

-Kevin



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2007 GMC 2500HD LBZ Duramax/Allison CCSB 4x4 SLT Black.
DIY AUX fuel filter, Edge Evo CTS, EGR Blocked [now removed], Fingersticked, PCV rerouted, Homebrew B100, 285/75-17 Nitto Terra Grappler G2 on H2s.

Last edited by OkDually; 07-26-2019 at 01:38 PM. Reason: repaired video link
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Old 07-26-2019, 01:23 PM   #2 (permalink)
JoggerFogger
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I just watched that video again on my screen and it looks like the clutch is wobbling when it engages. Not sure if that's part of my problem or normal.

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2007 GMC 2500HD LBZ Duramax/Allison CCSB 4x4 SLT Black.
DIY AUX fuel filter, Edge Evo CTS, EGR Blocked [now removed], Fingersticked, PCV rerouted, Homebrew B100, 285/75-17 Nitto Terra Grappler G2 on H2s.
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Old 08-05-2019, 11:51 AM   #3 (permalink)
JoggerFogger
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I bought a clutch. Finally arrived on Sunday and I dove in. I got it all in, assembled, shimmed just perfectly and went to put the belt on and realized I had the wrong part.
The new one had a 4 groove belt pulley. I have a 6 groove belt. .
Took the whole thing back off and put it in the box.

What I learned during the process is how the clutch works. You can see the rubber part of the clutch on the left in the picture. That part flexes when the magnet pulls the outside part in to engage the clutch. You put washers (shims) under the clutch bolt to set the gap on the clutch. The original one was almost 1/8" out with a single thick shim in place from the factory. The new one I set up almost touching. Spec is .020-.035". I was at probably .100" on the old worn out one. No wonder it didn't work.

So when I put the old one back together, I took out the washer shim and closed the gap on the clutch. Guess what? It works fine now. I ordered the correct clutch anyway, but I'm sure I could get another 30k miles out of the original. BTW, 182k miles on the original.



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2007 GMC 2500HD LBZ Duramax/Allison CCSB 4x4 SLT Black.
DIY AUX fuel filter, Edge Evo CTS, EGR Blocked [now removed], Fingersticked, PCV rerouted, Homebrew B100, 285/75-17 Nitto Terra Grappler G2 on H2s.
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