Scot's Rear End -- The IRS

[Aristides (Aristides Balanos)]

@ScotThompson

I found my fish scale. I have 4.5 lb-in of torque on the pinion pre-load. So there is something but it is 3.5 lb-in below the new-build spec. of 8 to 12 lb-in. However, there is no spec for a used condition. I’m leaning towards just changing the seals (and the incorrect bolts) and moving on.

Even 4.5 lb-in could be much for used bearings. Better loose than broken.
Mine felt also loose (Salisbury with crush sleeve), tighten the nut a bit more to try but went back just a hair past its original position.

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…

And the IRS is out... with pictures

Pinion Preload Update You may remember from the previous posts that I adjusted the pinion preload with the hope that it would eliminate a very faint whine on deceleration. The whine on deceleration went away but instead I had the same faint whine on acceleration… The black line, is the original position. [DSC_0157] I loosened the nut back, but not all the way, and found the sweet spot, the whine on deceleration is almost inaudible and no noise on acceleration. [DSC_0328] . Road Test E…