On disassembly my pinion had inner shims (total of 0.023’’) and
outer shims (total 0.123’’ but no collar at all. There is a step on
the pinion shaft on which the outer shims sat, but it is stamped
with the identification of the ring/pinion set.
Do ALL diffs have this spacing collar, or was the form of the
pinion shaft changed at some point?
Andrew–
1968 3.8S
Zurich, Switzerland
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from JagWaugh sent Mon 20 May 2013:
Andrew,
Foto, please - I can�t imagine at the moment what you mean.
But in my diff it was the pinion and then the bearing and
then a set of shims and a large tube and then the other
bearing. Like in the outer halfshafts. And you adjust these
as usual.
What I also believe to be true is that in fact the shims
are only needed ONCE, at the factory, to compensate the
foundry tolerances of the parts. The bearings themselves
are high precisely made things so you�d rather not need to
change shims wherever in this IRS at all if you renew
bearings.
Just a thought…
Carsten–
Restoration in progress: 1966 2+2 LHD manual
Goettingen, Germany
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from Carsten sent Mon 20 May 2013:
Carsten,
My concern is this: The diff shows signs of having been worked
on by someone other than the factory, so I’m not sure if it is
complete and assembled correctly. It tested fine enough in terms of
backlash and such, but you never know.
Anyway, here are some pics of what came out with the pinion:
In reply to a message from JagWaugh sent Mon 20 May 2013:
These shims are used for setting up the preload on the pinion. Very
rarely is it correct by just reusing what was there. It gets very
tedious pulling and installing the pinion but it must be done. As a
start, just assemble as it was and take a reading. Adjust by adding
and removing as necessary.–
The original message included these comments:
My concern is this: The diff shows signs of having been worked
on by someone other than the factory, so I’m not sure if it is
complete and assembled correctly. It tested fine enough in terms of
backlash and such, but you never know.
–
Dick Maury , Rebuild Dept.- Coventry West, JCNA President
Lithonia, GA, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from JagWaugh sent Mon 20 May 2013:
Well, well, well. Three wells make a lot of water, as my
maths teacher used to say.
It all checked out fine, but you had to take it to bits
Herr Waugh. I’m certainly not feeling any Schadenfreude
but the expression ‘Wenn schon denn schon’ comes to mind!
Have you got big enough pieces of shim steel in you
horological tool kit?
Pete–
The original message included these comments:
complete and assembled correctly. It tested fine enough in terms of
backlash and such, but you never know.
–
1E75339 66 D, 885958 62 FHC,1R27190+1R28009 70FHCs, 1960 Mk9
Gaithersburg, Maryland, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from PeterCrespin sent Mon 20 May 2013:
Pete,
Living in Gaithersburg seems to have relaxed your previous
English reserve…
I took it all apart because I found a dished friction plate
with a crack - previous to taking it apart all the measure
measurements were well within spec, but sure enough I did find some
signs that the broken parts of the disc had reached the diff main
bearings, if only for a brief time.
As a matter of course I purchase new shims in excess quantities
to those found on disassembly. ‘‘Wenn schon denn schon’’ indeed - All
new bearings, seals etc - I don’t see the point in touching a
subassembly if it isn’t rebuilt as new when I’m done. Costs a bit
more, and takes a bit more time, but worth it afterwards in my
opinion.
I am having trouble locating new tab washers for the Output
shafts (mine are the type with a nut & single tang tabwasher on the
inside of the housing). The both tabs that were used cracked and
broke off when I bent them back down to get the nut off. I could
soften and reuse them but would prefer to fit new ones. Does anyone
have a source for these, or spares they are willing to sell?
As to the horological kit, lets put it this way, Watches are
machined so consistently and with such precision that they need no
shims. Clocks, on the other hand, are generally so sloppy that
shims would be extranious. Aside from that, the ID of the smallest
bearing in the Diff is larger than the OD of most clock wheels, not
to mention the case of even a largish pocket watch.
To return to my original question, I think I have the answer.
This diff is from my Saloon - Although the parts manuals and
explosion drawings list the collar, a close reading of the S-Type
and 420 manuals reveals that the collar is not mentioned in the
assembly procedure. Furthermore, the E Type manual states ‘‘install
the pinion bearing spacer if fitted on the unit under repair’’ (p
H.21), so… NOT all pinions had spacers.
Andrew–
The original message included these comments:
It all checked out fine, but you had to take it to bits
Herr Waugh. I’m certainly not feeling any Schadenfreude
but the expression ‘Wenn schon denn schon’ comes to mind!
Have you got big enough pieces of shim steel in you
horological tool kit?
–
1968 3.8S
Zurich, Switzerland
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from JagWaugh sent Tue 21 May 2013:
Oh, and by the way…
If anyone decides, as I did, to turn up a master
spacer to measure the Hub spacers, don’t forget to turn a
step into it such that you can also set your DTI to the
0.9925’’ cone face to main bearing bore offset. If you
don’t think of this while the chunk of bronze is still in
the chuck you end up having to clock it all back in for
the sake of a half a minute to turn the step.
Carsten, it will take a while until I can send you the
master spacer, but it will be a little bit lighter, and
even more useful when I do.
Andrew–
1968 3.8S
Zurich, Switzerland
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from JagWaugh sent Tue 21 May 2013:
Thorough as always. I forgot you’d found some internal parts
starting to break up. In for a penny in for a pound.
You’ll deserve every kWh of the warm glow of satisfaction from a
well-functioning rebuilt diff that wasn’t left to chance.
Interesting comments on watches vs. clocks, although my horological
reference wasn’t serious.
Pete–
The original message included these comments:
Living in Gaithersburg seems to have relaxed your previous
English reserve…
I took it all apart because I found a dished friction plate
with a crack - previous to taking it apart all the measure
–
1E75339 66 D, 885958 62 FHC,1R27190+1R28009 70FHCs, 1960 Mk9
Gaithersburg, Maryland, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from JagWaugh sent Tue 21 May 2013:
Andrew,
Try Googling JLM556. If you do that in the US you get a large
number of sources for the part, from the Jag specialists to
general suppliers like Sears, Amazon.com, and of course E-bay.
-David–
The original message included these comments:
I am having trouble locating new tab washers for the Output
shafts (mine are the type with a nut & single tang tabwasher on the
inside of the housing). The both tabs that were used cracked and
broke off when I bent them back down to get the nut off. I could
soften and reuse them but would prefer to fit new ones. Does anyone
have a source for these, or spares they are willing to sell?
–
davidxk '56 XK-140 OTS, '69 XKE OTS , '98 XK8
Monterey CA, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from JagWaugh sent Tue 21 May 2013:
Hi Andrew, First I must say that I do not know either of you
personally! Now I will say that I had quite a chuckle when
read your sentence. No disrespect here, but I firmly believe
that little if any of the '‘English reserve’ existed either
before or after the move. Since I came from that place I
feel I can comment. But now ducking very low.–
The original message included these comments:
Living in Gaithersburg seems to have relaxed your previous
English reserve…
Andrew
1968 3.8S
–
John M Holmes 1973 E Type SIII Supra 5Sp, 70 SII OTS 05XJ8L
Ontario, Canada
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from John M Holmes sent Tue 21 May 2013:
John,
I posted the comment with tongue firmly in cheek. I suppose the
Belgian part in Pete is dominant.
David,
Thanks for the tip on the tabwashers… Now ordered along with
all the rest of the bits. In for a penny, in for 300 Pounds.
Andrew–
The original message included these comments:
read your sentence. No disrespect here, but I firmly believe
that little if any of the '‘English reserve’ existed either
before or after the move. Since I came from that place I
–
1968 3.8S
Zurich, Switzerland
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–