stuck diff locks!

[Marc Swanson]

> Do you get tyre judder when you go around corners?  That's a sure
> indication
> of a locked diff.  Lots of judder = locked rear diff.  Medium amount of
> judder = locked centre diff.

The odd thing is there is almost no judder.  With both diffs locked (both
lights on anyway) there is definately a judder but with just the rear
"locked" (the light on my instrument cluster on) I can't really even feel
it..  I didn't even know there was an actuator rod on either diff. I thought
it was 100% vacuum controlled?


> In my experience, it's usually the centre diff that sticks on as
> the vacuum
> mech for that diff is on the rear diff and the actuating cable to
> the centre
> diff tends to bind.  Have your vacuum connections got swapped around?

quite possibly... but I don't think I touched the vacuum hoses going to the
diff locks.  I'll have to check the routing carefully.  I know there is the
big connector that hooks up to the back of the diff lock switch but what
does the hose look like that supplies vacuum to the system?


> Check that you can mechanically move the lever on the diff.  If
> that's free
> to move, then suspect a vacuum problem.  I noticed that my 80q
> doesn't like
> unlocking under load.  This loading can happen because of collapsed diff
> mounts,

still have to replace those.  I've got the parts but no time!

> acceleration (I'm not sure whether this is due to loading
> or because
> you get less vacuum), or because your tyres have slightly different
> diameters.
>
> Jack all four wheels up and try it then.

Ooooh. Good idea.  I didn't try that.  Plus it will tell me if my diff is
really locked or not since both rear wheels should turn at the same rate
right?


Later


-Marc-

/* +++++++++++++++++++++++++++++++++++++
+Marc Swanson                          +
+                                      +
+http://marcswanson.ne.mediaone.net    +
+                                      +
+87 4kcstq                             +
+85 4ksq  "the spare"                  +
+87 5ktq   donor (Parting out)         +
+++++++++++++++++++++++++++++++++++++ */