4kq diff lock vacuum lines

[Robert Mangas]

On 2 out of 2 4kqs the problem for me was the actuators themselves; the '86 
had cracks in both and the front one on the '87 was chewed by mice.  I 
patched them all with JB Weld.  The lines themselves are rubber segments 
which are pushed over either the actuator nipples or the harder plastic 
lines that run through the body.

  The lines to/for the front pretty much come down from right above the 
actuator unit, and slightly behind.  It's all buried behind a heat shield 
that has ~3/8" of accumulated oil and road grime over the bolts which secure 
it.  I found the easiest way to 'look' at it was to first get the lay of the 
land with a mag light and an inspection mirror and then to really figure it 
out using my fingers (eyes closed).  It's fun.

  The rear is easier; the lines come from towards the front of the car and 
as I recall the shielding was easier to work with.  On both my cars the ends 
of the rubber hose sections were shot; Audi thoughtfully included enough 
rubber line that a half-inch off each end was no problem.

  I think the easiest way to check the system is first to make sure that 
your lock-lights work (and that they verify locking), then use a mity-vac to 
make sure the actuators are free and hold vacuum (on both sides).  If that 
all checks good, time to look for leaks.  I started by cutting the 
aforementioned half inch of rubber off _every_ rubber/hard plastic line 
joint in the engine compartment.

  Good luck,
Robert

>From: "Steve Arbaugh" <sneekerz at comcast.net>
>To: "Quattro List" <quattro at www.audifans.com>
>Subject: 4kq diff lock vacuum lines
>Date: Fri, 2 Jan 2004 17:08:28 -0800
>
>Ok, so now that there’s snow on the ground here in Seattle, I figure it’s
>time to figure out why my diffs don’t lock (great timing, eh?). I can lock
>the center diff by crawling under and pushing the rod back and forth, but
>that’s not really convenient while driving down the road. The light on the
>panel comes on like it’s supposed to when it’s locked. What I can’t seem to
>find are the vacuum lines that are supposed to make this thing work
>automagically. Where on the lock actuator are the lines connected? And,
>where do they come from (from somewhere under the hood or ???)?
>
>I haven’t even looked at the rear locker yet, so any insight will be gladly
>accepted. I also haven’t been to the back side of the switch yet because I’
>ve never figured out how the bits of the console come out, the ones with 
>the
>window switches then the one with the diff lock switch.
>
>Why did they put a catastrophic converter right in my way???
>
>Steve
>’86 4kq
>’86 5ktqa (with working diff locks)
>kent, wa
>
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>quattro mailing list
>quattro at audifans.com
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