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Jaguar Repair/amendment


Upon further investigation the brake disc is not frozen.  One of the broken bolts is jamming the rotation.
With this relegation I can only inquire as to the probable cause of the bolts shearing.
Should I replace the ones on the right side also?

I worked for BMC and BLM in dealerships through almost the whole life of the MGB and I never seen the bolts shear off on the disk to hub. My guess is that the disks were replaced by a mechanic who used a air wrench to tighten the bolts and thus he over stretched the bolts. Too many mechanics use air wrenches to tighten bolts that should be torqued.

I taught engine theory and engine rebuild in two major commercial mechanics schools and we stressed to "Take things apart with an air wrench and build with a torque wrench". But I see many mechanics today build with air wrenches.

I take my car today to get tires put on and I make sure I am standing there when they put the wheels back on so I can tell the mechanic to just snug the wheel lug nuts as I will torque them at home.

I have seen mechanics set their air wrench on a low torque and then use a torque wrench and that is ok or use a 3/8 drive air wrench and then use a torque wrench. No, I don't torque every bolt on my car. But I do torque all the bolts that have my life in their hands.


Jaguar Repair

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Howard M. Fitzcharles III


Jaguar from the XK 120 to XJ-6 ser. 3 1987


Dealership line mechanic on MG, Triumph, Jaguar for 15 years, Instructor in commercial mechanics school 2 yr. Product information manager for piston and valve manufacture, Instructor & hotline answer man for import car parts importer 15 yrs.

Associate member SAE EAA member

Import Car magazine

ASE Master Auto with L-1 certification up to 2000

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