ZJ rear disc brakes on D44 questions

[BrianG]

alright...I feel really stupid. I cant seem to get the rotor to sit square on the shaft flange. It should be flush up against the flange correct? I feels like something is keeping it from sliding all the way on, and only half of the rotor fits...


Second question, do I need longer wheel studs? I didnt think I did, but there doesnt seem to be much room...just wondering.

 

[Andy in Pa.]

It should fit flush. You may have to grind off the lower rivet though. I am doing this swap this weekend. I machined out the center hole of the backing plate to 3" so the bearing may pass through, and re-drilled the mounting hole pattern in the backing plates to the correct hole pattern for the XJ D44. THe upper holes are close, but need to be slotted to the outside slightly. The bottom holes need to be re-drilled. Also, a spacer needs to be made to push the oil seal in place between the retainer plate and the oil seal.

HTH's

Andy

 

[Andy in Pa.]

Sorry, just re-read your post. I have not gotten that far yet, but it should sit flush. You should not have to lengthen the studs either. The rotor is about the same thickness as the drum.

A.

 

[BrianG]

alright thanks. I spray painted (primed, then top coated) the flange end...so Im thinking the paint added just a tiny too much thickness for the rotor to slip on. I'll try and clean it off and see what happens.

 

[Jekyll]

The rotors I used were a tight fit over the flange also. I used a Dremel and opened up the hole in the rotor a bit, so it slides on but isn't loose. As you mentioned, cleaning off some paint might do it, in your case.

The wheels studs can, effectively, be a bit shorter. Depending on the manufacturer, rotor thickness can vary. I notice that cheap Chinese rotors are thicker(poor quality requires more material) vs. Raybestos, for example, which are thinner. I used stock studs for several months without any problems. I have since swapped them for longer ones.

Be sure that you have sufficient thread engagement on those studs/nuts to be safe.

 

[xj4rocks]

you can enlarge the hole in the center of the rotor a tad and it will slide on nice and easy.

I used studs meant for the front. They work like a champ. with my rotors the rear studs were too short for my liking.

 

[BrianG]

I think these rotors might be OEM, but im not sure.

And thanks for the confirmation on the enlarging of the hole...I thought I was going nuts .

 

[xj4rocks]

don't enlarge it too terribly far - i just did it enough to clear the axle flanges.