[Rovernet] play in 3500s differential [SEC=UNOFFICIAL]

Wed Apr 27 21:36:24 EDT 2016

UNOFFICIAL

UNOFFICIAL

Barry and Vern,
There was a major change in the Crown wheel mounting bolts from Diff
number Suffix D onwards Essentially the later ones have 12 x 3/8 UNF
bolts the early have two fitted bolts and 10 standard, loose fit in
wheel, 5/16 UNF bolts. Both require Thread locking compound and high
tensile washers of the correct thickness. Obviously this is also
important if you are buying a new gear set as the thread is in the crown
wheel.
Michael

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Mr Michael Coombs
Headquarters Branch 

HQ FORCOMD
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Fax: 612 8335 6648
Email: michael.coombs at defence.gov.au 

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-----Original Message-----
From: Rovernet [mailto:rovernet-bounces at rovernet.org] On Behalf Of
rovernet-request at rovernet.org
Sent: Thursday, 28 April 2016 02:00
To: rovernet at rovernet.org
Subject: Rovernet Digest, Vol 35, Issue 7

Today's Topics:

   1. Re: play in 3500s differential (Barry Lafbery)

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Message: 1
Date: Wed, 27 Apr 2016 08:29:08 -0700
From: Barry Lafbery <lafbery at shaw.ca>
To: Rovernet <rovernet at rovernet.org>
Subject: Re: [Rovernet] play in 3500s differential
Message-ID: <0CAB4FE5-FC89-4604-8DFD-E193FC20C30C at shaw.ca>
Content-Type: text/plain; charset=windows-1252

I seem to remember it was clunk as i pulled away, when it finally broke
the case it stopped the car I was only a few blocks from home and had a
hell of a job getting it home as it did not want to move. it had split
the casing about 6 inches long.

Barry 

> 
> I?ve had Barry?s experience except in a 4cyl car. I wasn?t driving it,
but the person who was said she did vaguely hear a ?tick, tick, tick?
from the back. The amazing thing was she probably drove the car 500
miles before I found the hole. The piece that had come out was fairly
high, so some oil was retained and I guess it was just enough.
> 
> Yours
> Vern
> 
>> On Apr 27, 2016, at 7:25 AM, peter king via Rovernet
<rovernet at rovernet.org> wrote:
>> 
>> Thank you, Barry. It sounds like you would have heard a repeated
sound or grinding as the bolt was coming in contact with the casing. Was
that the case, or did it just clunk when you put it in gear?
>> 
>> 
>>> On Apr 26, 2016, at 6:35 PM, Barry Lafbery via Rovernet
<rovernet at rovernet.org> wrote:
>>> 
>>> if it?s any help, the clunk i had in my last 3500s turned out to be
a loose crown wheel i did not catch it in time and it broke the casing.
>>> including mine i have heard of 3 3500s with the crown wheel coming
loose. One bolt only has to undo 1/2 a turn and they hit the casing if
you keep driving it breaks the casing. It?s really worth checking. When
i repaired it i drilled the bolt heads wired the bolts and also used
loktite on the threads.
>>> 
>>> Barry
>>>> 
>>>> 
>>>> Peter, since I just completed the exact job you're undertaking, I
can 2nd Vern's response that the 'play' you have is acceptable.  I had a
really bad 'clunk' but it was only at slow speeds, usually when the car
was coming to a stop.  Turned out it indeed was a bad u-joint.   The bad
news; the other 'clunk' from engaging the transmission never went away.
I remember we've had this conversation several times on Rovernet, and
apparently that clunk is almost a badge of honor with that atrocious
BW35.  I've never been able to eliminate it, even after having the
tranny completely rebuilt and then replacing all of the u-joints along
the entire drive line.
>>>> Best wishes,   Lance
>>>> 
>>>> Lance La Certe, Psy.D.
>>>> Outside of a dog, a person's best friend is a book.  Inside of a
dog it's too dark to read.
>>>> 
>>>> 
>>>> 
>>>> 
>>>>> Date: Mon, 25 Apr 2016 21:31:43 -0400
>>>>> To: rovernet at rovernet.org
>>>>> Subject: [Rovernet] play in 3500s differential
>>>>> From: rovernet at rovernet.org
>>>>> CC: peter at king-co.com
>>>>> 
>>>>> Hi all,
>>>>> 
>>>>> I?m in the middle of replacing half shaft u-joints in the 3500s,
and replacing seals and gaiter on the Dedion tube, and I noticed that
there is a lot of free play in the differential when I rotate the road
wheel back and forth. A ?blank space? before engaging. How much play is
normal, and what?s the best way to measure this? I made a set of marks
on the outer edge of the brake disc, and measured 3/4? of ?blank space?
when I move the wheel back and forth. I have no idea if that?s a
meaningful measurement, but it?s a place to start the conversation.
>>>>> 
>>>>> Any thoughts on this?
>>>>> 
>>>>> thanks,
>>>>> 
>>>>> Peter
>>>>> 
>>>>> 
>>>>> 
>>>>> 
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>> 
>> 
>> 
>> 
>> Peter King + Company
>> 10 Derby Square
>> Suite N2
>> Salem, MA 01970
>> 617-292-7877 x302
>> www.king-co.com <http://www.king-co.com/> www.facebook.com/pkingco 
>> <http://www.facebook.com/pkingco>
>> 
>> 
>> 
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> 
>   inkspotco.com ? 250 864 5619 ? in at inkspotco.com
> 
> 
> 
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