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I just bought a 1992 XJ40 4.0 a few weeks ago and didn't actually
realise that one of the wheel lugs was missing on the left
rear wheel.
After closer inspection, the bolt which it screws on to on
the wheel hub is loose so a bolt can't be screwed on to it
and it's quite rusty as if the car had been driven with only
four bolts for a while.
Is this a big issue? or can I fix the loose bolt without
replacing the hub?
I had a stripped wheel stud on the right rear hub of my '90 Majestic and repaired with a helicoil and locktite red. So far so good... Shops strip these studs with their hamfisted "techs" using impact guns to beat flat rate pay times. The stupid a$$ who stripped the stud on my car made a real mess of it and tried to cover it up - a well known Jaguar shop in Portland, OR is the most likely perp on this deal.
I tried to have Rogers rear bearings replaced at my go-to shop. They refused saying they didnt have the proper tools. Cool. Honesty. Love it. Anyway, Those hubs do seem to take some special equipment to change so I suppose the simplest way would be to try a helicoil. It would help too if theres a recess in behind there to allow a stud to be inserted. I was lucky on another similar project and was able to replace the entire hub unit with a spare the i had. This is a "heavy" project, but not overly complex...... Maybe call around to local yards? Good luck.
Congratulations on your Jaguar purchase and welcome to the Jaguar Forums!
The front wheel studs on the XJ40 are the type with a tapered spline that are simply pressed into the hub, but the rear wheel studs are threaded into the hub and their heads deformed with a chisel to prevent them from rotating out when the lug nuts are tightened. Here's a photo of the rear hub:
Replacing the rear studs requires a little more effort than the fronts, but it's doable. With a hack saw or reciprocating saw the head and threaded shaft of the old stud can be cut off, then what's left in the hub can be carefully drilled out. To install the new stud, you may need to remove the hub, which isn't as difficult as it sounds, but it may require a 3-jaw puller to get the hub out of the hub carrier. Also, the axle nut must be replaced with a new one because its helical threadlocking insert is only good for one use. A torque wrench capable of reading 250 ft. lbs. is required for setting the proper axle nut torque, but you can just get it as tight as you can at home, then have the correct torque set by a local shop with a big torque wrench.
The Jaguar part number for the rear wheel stud is CAC3878 and the axle/hub nut is JZN100035. They're still available from a Jag dealer or online through jaguarmerriamparts.com.
While you're doing the job, you'll want to regrease, or even better, replace the rear hub bearings. Here are links to photos showing how that work is done:
02-19-2016, 11:46 PM
1992 XJ40 Wheel hub bolt loose
