Measuring Pinion Preload

[Aristides (Aristides Balanos)]

Yes that’s what I did in the end.
Details over at the XJ forum thread:

And the IRS is out... with pictures

Pinion Seal Preload When I unscrewed the pinion nut on disassembly I had noticed that it was nowhere near the 100 - 120 lb.ft torque specified, and therefore my inquiries for the correct preload figures, I was sure it was not within factory specs… At the picture bellow there are two marks. The first one, with the black line, is the original position. This corresponded at: 50 lbs.ft torque at the nut 8 lbs.in. turning torque… exactly the same with the nut undone, i.e. no preload. The secon…