My xjs has about 1-2mm lateral movement at the tread, this is OK?
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1 - 2mm seems a bit much, Foggyoo - I āthinkā you should check bearing playā¦
However, it may also be caused by play in other areas - to be checked as wellā¦?
Frank
xj6 85 Sov Europe (UK/NZ)
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1 Like
Frank
I would say the jury is out on that amount of playā¦
I have just rebuild my rear end. New bearings, all tight press fits into their positions, new spacers machined to give 0.002" axial clearance with the axle spline torqued in position, all new universal joints in the driveshafts while they were out. Both sides have a small amount of movement at the tyre tread. I dunno how many millimetres it isā¦but is is more than my modern carsā¦which have NONEā¦ I donāt see or feel any movement in the diff output shaftā¦and the reason I re-did all this is the WOF test stated wear in rear bearings !!! I am not redoing any of this stuff again so I am thinking that some movement detectable,at the tread diameter is normal. The 0.001-0.003" end float in the bearings MUST have a consequence at the wheel outer diameter. I am thinking I did all the refurbishment for no reason other than a mechanic thinking my XJS rear end should be as firm as a modern rear end!!! And I believed himā¦
Regards
Matt
Frank
Correctionā¦I was pondering the source of my ālooseā wheel and did a few quick and dirty numbers on the bearing clearance. Making a few reasonable assumptions I reckon that the 0.003" bearing clearance would make for a wheel movement at the outer edge of the tyre of about just less than 1mm!!! Not as much as I was hoping for!!! Iāll have to check how loose ālooseā actually feels. Maybe I have a tiny amount of play in the diff output shaft and the whole shebang contributes to a ālooseā wheelā¦except the bearings would be there at 9 and 3ā¦hmmmmā¦Iāll have to check if there is a difference in looseness at different locations to figure the source outā¦
Regards
Matt
Status update
I got the U/Joint covers cleaned and painted
half shafts clean, painted, and the U/Joint pressed into one side
The brakes are off and cleaned
Back to the carrier boondoggle.
I got the bearing off the hub. Much to my surprise it came off pretty easily. the bearing was sacrificed, unfortunately.
More questions
I was expecting the bits behind the bearing (seal seat & water guard - thrower, water thingy 
) to fall off or at the very least be able to pull off. not the case.
Hereās a video with more questions.
Thank you in advance
Mark
Matt, one thing to keep in mind is that there are different qualities in the U/Jās when you check for movement get some one to pry the U/Jās apart and see if the movement is still there. If there is a small amount of play in each bearing it is going to add up.
Mark, try some heat around the outside of the ring and once there is some heat in there get a freee spray and throw that down the splined area. The combination of heat and cold may be enough to release the ring.
I am fairly sure that it should be loose when it was first assembled.
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In principle, Matt; with the hub carrier stable, the only tyre āwobbleā would be from bearing play - whichever push/pull position is applied to the tyre.
However; with slack in the wishbone bearings the hub carrier will also move - and wheel wobble will increase. The push/pull position may indicate the likely slack points - there should be none with only human force applied. Any hub carrier movement implies outer or inner pivot wear - though 6/12 oāclock motion may also involve universal joint wear. Point is that the wishbone and driveshafts work together to maintain wheel camber through the hub carrierā¦
There is also the for-and-aft test, again with no hub carrier movement - any movement implies inner pivot slack. However, with the wheels off the ground, the force on the radius arm tends to resist human forcesā¦
The lay-out with inboard brakes may have a bearing on āourā play - āmodernā outboard disks may limit wheel āwobbleāā¦?
Frank
xj6 85 Sov Europe (UK/NZ)
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imo, you should not attempt to remove the oil seal seating ring or water deflector, as there should be neglible wear, the seating ring will probably need to be cut & split off, the water deflector is known to be tricky to re-attach without risk of later detachment and rattling, and a new seating ring is an interference press fitā¦and surprisingly expensive from memory
that shaft pitting looks a wee bit concerning
Status UPDATE
Well hereās a video of the carrier - it would appear itās sustained a bit of trauma too. Is it garbage? Iāve considered adding a bit of aluminum to the casting with a couple of weld beads, I have serious reservations about that idea. because of, well, adding metal to this is gonna be a hot mess. Nearly 50 years of exposure to the elements as well as grease. Then thereās warping, which could be mitigated by pressing in a race to hold things in place and act as a heat sync. The biggest concern is weakening the integrity of the aluminum, unlike steal, the weld is the weakest part of the join.
Where the race is pressed in, it appears to be fine, so open to your thoughts.
its my understanding, if the bearing race spun, the item is considered to need replacing, however, maybe a little loctite would overcome that concern.
the rat-nibbled appearance of the fulcrum shaft area, never seen that
Rat nibbles.
Me either, it looks like a bad casting, combined with years of driving. The holes look like porosity
Sent from my BlackBerry 10 smartphone on the Verizon Wireless 4G LTE network.
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With no visible cracks and the outer tracks had to be pressed in with force(?), Mark - I see nothing very alarming on the hub carrier itselfā¦
The striations at the fulcrum shaft seems like the carrier contacted the road at one stage - possibly on a deeply rutted farm road? Itās definitely no ordinary wear - and would have been a reject if it was a casting faultā¦
I do notice a bit of an indent in that area - it is not perfectly round. If it poses no problems in fitting the fulcrum shaft and bearings - I donāt think it warrants any action. Welding anything on the hub carrier is discouraged - for the reasons you mentionā¦
Frank
xj6 85 Sov Europe (UK/NZ)
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Status update:
Iāve reviewing the wear of the inner fulcrum shaft bearings wondering if they are resuable or not. the races definitely have a wear pattern to them. but after sitting in a bit of PB Blaster for several days, the crunchiness has gone away.
However, the wear pattern in the centre races is detectable through the long shaft connecting the inner fulcrum arm to the diff. Iāve got a video where I mind-numbingly ramble about bearings. Like I know what Iām talking about. I havenāt gotten the edit done yet. This takes a huge amount of time for somebody like me whoās OCD and wantās the end product to be worthy of a Golden Globe.
Anyway, Iāll keep you posted when I get new content on youtube.
Thanx for following this thread
Mark
I didnāt see anything in the Green Bible. Does anybody have clue as to what Iām on about? or better yet the acceptable tolerance between the carrier and the fulcrum.
Thank you as always
Mark
Different beast but the same set up. I have just removed the hub carrier from my XJR and it was a tight fit between the lower arm ears whithout shims, my āSā type I believe will have shims
Thank you, but I was talking about the outer fulcrum tolerance between the fulcrum ears (for lack of what knowing the actural term) and the carrier & hub assembly. thereās quite a bit of slop. I did have a bright moment by leaving the other side intact as a reference. and I donāt see any shim there but thereās quite a bit of greasy felt bulging out saturated with oil or old grease. My point is I didnāt see any shims - but tat doesnāt mean there arenāt any.
but I just looked at the parts guide, and sure enough thereās sims in there. .007 and 003. which arenāt going to be thick enough to keep it from sliding on the fulcrum shaft the rod thatās threaded on both ends.
Now Iām wondering if the carrier needs to be replaced too. Iād put a video up, but Iām tired, Iāve had an emotional day with my daughter - So being ālively on video just isnāt in the cards todayā
Tomorrowās a new day with new hopes.
Mark
Iāve got a couple new videos posted.
removing the fulcrum arm
removing the emergency brake
the next video is removing the caliper assembly
then painting stuff
I have a tips and tricks video in the works too.
I had no idea how much time it takes putting these together. Partly because Iām learning the software at the same time. I should know better. Learning the software + Providing a product = deadline failure.
Thanx
Mark
Tell me what you think in the comments. Be honest. If they suck then tell me why? So I can improve. I know the fulcrum one sucks, and the e brake video I kept on forgetting about the cameraā¦ Itās a learning process.
Thanx
Mark
yeah, I think I am interested. PM me with your address and Iāll send a shipping tag. how much does it weigh? and how much of it is in good shape
I see a couple of goodies in the box that I will be needing.
sending pm your way now
I received the new parts for the IRS hub & fulcrum arm. Even though I purchased a used carrier Iām still considering using the hold one that has been the topic of discussion and a couple of videos.
That being said, I set the fulcrum and hub on the table with the carrier between the two mounting points and did some measuring.
The total space between the outside fulcrum and the carrier is .044 inches the big (outer) shims total .025 and the total of the smaller ones that go between the tube inside the carrier between the two tapered bearings is a total of .020.
I"m assuming Iām not supposed to count the inner shims because those shims provide are for the fulcrum bolt / tube between the tapered bearings. So, that leaves the outer big shims
.044 - total space between the outer fulcrum (fork) and the hub where it will mount
.025 - total thickness of all 4 shims
.0019 - is the difference between the shims and the space.
according to the book, (I think, if I understand) that leaves .0009 of weeble wooble left.
I suppose a more accurate way is to figure the preload after the itās all put back together. I wanted to have an idea of whether or not to use the carrier in question, or the used one that I bought, that look like new, and could probably just be put in place - and not disassembled.
Iām not sure what to do.
Thanx
Mark
So the question is this.
The di