HELP!!! Rear Diff Problem?

[Jason Stone]

As an aside to the msg I just sent you - it did work
perfectly (the diff lock and the switch) up until I
got stuck in the ditch.

Maybe got jolted or broken by impact with ground?

Jase


> -----Original Message-----
> From: munrof 
> Sent: Montag, 22. Januar 2001 14:27
> To: jason.r.stone; quattro
> Cc: munrof
> Subject: Re: HELP!!! Rear Diff Problem?
> 
> 
> Hi Jason;
> 
> If your diff won't unlock, it is usually because the
lock 
> lever mechanism on
> the diff is corroded. The vacuum system can pull the
lever to 
> lock the diff,
> but the return spring isn't strong enough to unlock
the diff. 
> Get under the
> car and manually move the lever into the "unlocked"
position. 
> Free up the
> mechanism while you are under there.
> The light goes out at 40 kph because the system is
designed 
> to automatically
> unlock the diff at that speed. If the lock lever is
stuck, 
> the light may go
> out (indicating the signal is sent to unlock the
diff) but 
> the diff may stay
> locked.
> If you are driving at 140 kph with a locked rear
diff you 
> will ruin the
> diff. The car is also unstable because, as you have
noted, 
> turning with a
> locked rear diff causes one or both wheels to skid
around the 
> turn - the
> wheels want to rotate at different speeds as you
turn but the 
> locked rear
> diff keeps them rotating at the same speed. This is
why your car feels
> "nasty" when you turn.
> Get the diff unlocked before you drive the car. The
clicking 
> noise may be
> due to diff damage - there's a lot of stress on a
locked diff 
> when turning
> at high speed.
> 
> Good luck!
> 
> Fred Munro
> '94 S4  122k km


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