Hello James,
You asked about measuring the pinion depth. It cane be done with
some equipment which you can make.
It will help in understanding my explanation if you look at a
drawing of the pinion setting distances in a Jaguar Workshop
Manual. For example Fig.33 on page H.21 of the Jaguar Service
Manual, publication E/123/8. This drawing shows a point
representing the centre of the crown wheel. It is labelled “CL
GEAR” An imaginary line drawn through the centres of the main
bearings which carry the differential are also centred here.
Using the CL Gear as the centre point, draw a circle 3.265 inches
diameter. This is the bearing diameter and the circle represents
the bore in the sides of the diff in which these bearings are
clamped.
Now, imagine the differential was standing on the pinion input
flange. What you call the “Pinion Depth” is the vertical
distance from the top of the pinion to the CL Gear. The Workshop
Manual shows this as dimension B which is called the Zero Cone
Setting. It should be 2.625" + or - the correction engraved on
the end of your pinion. Half the bearing diameter is 1.6325".
Therefore, the lowest point in the bearing bore is 2.625" -
1.6325" + or - correction above the end of the pinion. i.e.
0.9925" + or - correction above the end of the pinion.
If you had a piece of 1" square section steel bar ground to a
precise thickness of 0.9925" and rested it on the end of the
pinion it would be at almost exactly the same height as the
bottom of the bearing bore.
If you then set up a dial gauge clamped to another piece of
ground material (such as a 1" x 1" angle) and were able slide it
across the top of the ground steel bar you could compare the
readings on the top of the ground bar and the lowest point in the
bore. This enables you to calculate the actual Pinion Depth.
When I do this measurement I take a number of readings with the
pinion at various positions. The pinion bearings have to be set
with no clearance, so I do this measurement with no spacer
between the inner and outer pinion bearings.
This measurement job is pretty tricky. I found it helped to
drill a hole horizontally through the ground bar above the centre
of the pinion and the put a bolt in the hole. I steady the bar
with this as I slide the dial gauge holder across the bore to get
a comparative reading.
I have set up two diffs this way. The results have been very
good judging by the silent running of the diffs. The job can be
satisfying, but you need patience.
Clive Arnold
Brisbane, Australia
65 FHC, 1E20761-------Original Message -----
From: james@8bells.com
To: e-type@jag-lovers.org
Sent: Tuesday, August 06, 2002 1:25 PM
Subject: [E-Type] Differential rebuild. I need assistance
Hello All,
I am rebuilding my differential on my 3.8 Series 1. The shop
manual shows a special tool for setting the dial gauge to set
the
pinion shims. I do not have the stepped block that is shown.
So, my question is: How do I set the pinion depth ?
Thanks for you help, James
James Douglas