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Sanden clutch rebuild

crewsr on Mon June 23, 2008 3:29 PM User is offlineView users profile

Year: 1984
Make: VW
Model: Rabbit
Engine Size: 1600
Refrigerant Type: r134a
Country of Origin: United States

The clutch on my Sanden 508 doesn't won't engage properly. I rebuilt the system last summer using a brand new Sanden compressor, but re-used the clutch/pulley/armature plate because I wasn't able to source a compressor from ACKits that had the correct pulley. Now, 1 year later the clutch won't engage unless I tap on it after turning the AC on. Once the clutch engages is stays engaged until I turn the AC off again. While engaged, the system works perfectly. So fine, I need a new clutch. Can I re-use the pulley and purchase the rest of the parts new? Any tips on troubleshooting this further? I've reviewed the Sanden Service .pdf and the procedure for replacing the clutch and it seems pretty straight forward. Expert input is appreciated!

Thanks!

mk378 on Mon June 23, 2008 3:48 PM User is offline

Try closing the gap some first. That may be all that it needs.

crewsr on Mon June 23, 2008 6:08 PM User is offlineView users profile

Do I close the gap by removing 1 (or more) of the shims under the armature, correct? I haven't measured it (feeler guages have disappeared), but the air gap looks to be about .5 - .75 millimeter. Too much?

Thanks!

mk378 on Mon June 23, 2008 6:52 PM User is offline

Right, take the shims out. About 0.5mm is the largest it should be. There's no such thing as too small until it starts to rattle or drag when disengaged.

Cussboy on Mon June 23, 2008 8:00 PM User is offline

First tighten the nut on the end-mine was loose on my Sanden 708, and that fixed it.

crewsr on Tue June 24, 2008 10:35 PM User is offlineView users profile

Hey is there a good substitute for the tool to hold the clutch still while I loosen/tighten the nut, or do I absolutely need the officially sanctioned Sanden branded pin spanner?

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