Hi Guy,
What started all this was a suggestion of a lister that the broken axle
was due to too much play in the dif.
I wasn't trying to introduce any confusion, but maybe I did. The only
place you can fit shims in the dif. is to move either the pinion over to
one side or the other, or to move the pinion forward or back. These are
procedures best left to a shop with equipment to adjust or set up a new
set of bearings in the dif and/or replace the ring gear and pinion.
Now about the thrust washers. They are located behind the two sets of
spider gears and they are of two types. One set is a flat phenolic
washer that rarely wears down, on one set of gears that the axle shaft
end fits into, and the other is a set of cup shaped copper washers behind
the other two spider gears. They work against a rather small surface
area and wear down somewhat more rapidly. Now when they wear down, the
mating surfaces of the spider gears move out to the ends of the teeth,
leaving them more vulnerable to breaking. Now here's a bit of info. I
have replaced only one set in almost thirty years of driving LBC's and
working on customers cars. Maybe it's just good luck.
The only time you would normally access these pieces is when you need to
remove a piece of stuck, broken axle shaft. Otherwise, it's no big deal
you don't worry much about this.
On cars that are raced with stock differentials and do a lot of one wheel
spinning on take off, that's a different story. They will be prone to
high rates of wear, but usually something else will go south (kaput!) so
this whole assembly is tossed and another used one is installed.
Paul
PAsgeirsson@juno.com
On Mon, 26 Apr 1999 22:09:28 +0100 "Guy"
<Guy@weller-lakes.freeserve.co.uk> writes:
>PAul,
>So this is different to fitting shims ??
>I am now confused as your last message seemed to be saying leave well
>alone
>and not to consider tampering with the diff at all ?
>
>Now what ?
>Guy
>-----Original Message-----
>From: Paul A Asgeirsson <pasgeirsson@juno.com>
>To: toobmany@bigpond.com <toobmany@bigpond.com>
>Cc: spridgets@autox.team.net <spridgets@autox.team.net>
>Date: 26 April 1999 13:33
>Subject: Re: Fw: Diffs.
>
>
>>Your right, Peter. Always a good idea to have fresh thrust washers
>under
>>the spider gears and an "unworn" spider gear shaft. Saves broken
>spiders
>>by improving the tooth contact.
>>
>>Paul
>>
>>PAsgeirsson@juno.com
>>
>>On Mon, 26 Apr 1999 23:06:19 +1000 "Angela Hervey-Tennyson & Peter
>>Westcott" <toobmany@bigpond.com> writes:
>>>
>>>True - but try reshimming the spider gears and while you're at it
>>>replace
>>>the shaft and lock pin.
>>>
>>>Peter Westcott
>>>
>>>----------
>>>From: Paul A Asgeirsson <pasgeirsson@juno.com>
>>>To: Guy@weller-lakes.freeserve.co.uk
>>>Cc: spridgets@autox.team.net
>>>Subject: Re: Fw: Diffs.
>>>Date: Monday, 26 April 1999 8:17
>>>
>>>On Sun, 25 Apr 1999 18:59:01 +0100 "Guy"
>>><Guy@weller-lakes.freeserve.co.uk> writes:
>>>>
>>>>Oh, Great List Knowledge,
>>>>
>>>>The diff on my 1500 has a fair amount of backlash, and this talk of
>>>>broken
>>>>halfshafts is beginning to get to me. I have had one break before.
>>>>If worn diffs add to the risk .....
>>>>Anyway, what sort of a job is it to rebuild a diff unit, or can I
>at
>>>>least
>>>>reduce the backlash with shims ?
>>>>
>>>>Guy
>>>
>>> Hi All.
>>>
>>>The issue of excessive backlash on the pinion gear is something that
>>>really can't be altered without a NEW ring gear and pinion. Assuming
>>>there is no more than marginally excessive noise from the dif
>>>assembly,
>>>the backlash you got is what you are stuck with. Any attempt at
>>>changing
>>>it will result in change of heel, toe, flank and face contact on the
>>>ring
>>>gear resulting in horrible changes of sound levels from the rear
>end.
>>>The correct amount of back lash is etched on the side of the ring
>gear
>>>near the outer perimeter. This is for a new one, not one with 35
>>>years
>>>of use on it. So enjoy the ride and don't fuss about the backlash
>>>very
>>>much.
>>>
>>>Paul
>>>
>>>PAsgeirsson@juno.com
>>>
>>
>>
>
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