Re: 4000Q Diff. Question

[glen.powell@smc.com]

  The rear diff lock on 4000Qs and ur-Quattros is prone to corrosion
  problems. There is a clevis pin that goes through the lever arm attached
  to the shaft that locks/unlocks the mechanism. This pin and the whole
  assy can basically rust solid if not used frequently. It's an easy fix.
  Just remove the clevis pin, lever assembly and vacuum actuator/servo and
  clean-up the lever and pin with a file or snadpaper, etc. I painted all
  the metal parts last time to try to slow down subsequent corrosion. Also,
  coat all surfaces and parts with some heavy grease on reassembly to keep
  water/salt away and further slow the corrosive process. Do *NOT* try to
  force the assembly to move to free it up! You will likely break off the
  end of the rod from the vacuum actuator. Take the time to remove, clean
  and grease it. 'Nother hint: completely remove the bolt that holds the
  lever arm onto the shaft; the shaft is grooved and the lever will still
  be held onto the arm by the bolt even when the nut on the attaching bolt
  is totally loose.

  -glen