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AC Compressor clutch Material?

joejwhip on Fri June 29, 2012 10:14 PM User is offline

Year: 1997
Make: Subaru
Model: Legacy
Engine Size: 2.5
Refrigerant Type: 134A

Hi I have been diagnosing an occasional clutch engagement problem on my 1997 Legacy. Ac is. very cold, compressor is quiet, everything is great till car gets hot. If compressor cycles off it does not always go back on. Voltage is being supplied to the clutch but no engagement. A light tap on the face of the clutch hub and the clutch snaps in and engages. I measured the air gap which is .035 / .82mm. What I have seen online suggests a gap of .012-.024/.30-.60mm for the Zexel DKV14D compressor. I am planning to pull the clutch hub soon as my local Pep Boys Auto has the clutch removal kit back in for loan. Here is my question. Does anybody know if there is supposed to be some friction material on the clutch or is this clutch metal to metal only? And if there is friction material will it be on the pulley or the clutch hub itself? I am prepared to remove a shim to get the air gap back in range but want to know if I should be replacing the clutch hub instead. I am thinking that maybe there was friction material in there at one time and the large air gap is due to the loss of that clutch material.

Cussboy on Sat June 30, 2012 12:18 AM User is offline

i believe this is an electromagnet coil and it pulls steel disc in to lock into place (engage).

emsvitil on Sat June 30, 2012 1:22 AM User is offlineView users profile

All the clutches I have ever seen have been metal on metal.

Re shimming to minimum specs should fix it. (I've had to make shims from aluminum cans to get them thin enough at times)

-------------------------
Ed
SoCal

NickD on Sat June 30, 2012 8:48 AM User is offline

Idler pulley is cast iron, clutch plate, steel plate, has to be dry and oil free. But you already pointed out your problem with that large gap.

joejwhip on Sat June 30, 2012 9:17 AM User is offline

Thank you all for your quick responses to my post. I will go ahead and reset the air gap. The only part of the air conditioning that has ever failed in 190000 miles was the condenser-sprung a leak at the bottom- and a 100.00 dollar aftermarket replacement part fixed that problem. I also pulled the evaporator and found 15 years worth of bugs and leaves inside but no real loss of functionality!

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