Re: Loose Jag IRS Diff Bolts(?)
- From: mike <foo@xxxxxxx>
- Date: Wed, 26 Oct 2005 07:29:34 +0100
On 25 Oct 2005 17:05:09 -0700, "Jonathan" <star_man_2001@xxxxxxxxxxx>
wrote:
>On my '84 XJ6 4.2 there's been quite a cluck when changing into reverse
>- so figuring this must be loose diff bolts I've taken out the IRS
>unit... The as removed, the diff doesn't seem very loose (although I'm
>only human strength and it hangs from them) - any advice would be
>appreciated as I might as well ask before removing the bolts and
>spending time and money replacing them and perhaps not solve the
>problem.
Typically it is the bolts that hold the inner fulcrum brackets to the
diff that get loose. There are shims between the bracket and the dif,
and if a bolt is slightly loose, the shims creep out, leaving a gap
and a very loose bolt.
This then throws a lot of extra stress on the bolts at the top of the
diff, sometimes causing metal fatigue and cracking of the subframe
around the top bolts.
If all 8 of the diff mounting bolts are tight, then your problem is
elsewhere. Replacing the bolts is a waste of time, as they don't wear
out. BTW, the classic symptom of a loose jaguar diff is rear-end
steering if you suddenly accelerate or decelerate at speed.
Other things to look for are axial play on the diff output shafts
(have just fixed one where this was caused by a manufacturing defect
in the tab washer that locks the nut on the inner end of the output
shaft. The tab broke off, allowing the nut to come undone, leaving
the output shaft constrained only by the brake disk in the caliper).
A clunk when changing into reverse could also be caused by low oil
level in the diff.
Check for loose U/Js (bolts and play in the joint).
Also (but less likely to cause a problem at idle) clunks can be caused
by deteriorated subframe mounts or radius arm bushes.
For next time, you should really have got under the back of the car to
check for movement of verythin before dismantling.
regards,
Mike
.
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