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Does anyone know what the acceptable amount of end float (in and out movement) is on the rear hubs? I have around 3 to 4mm both sides. I understand that the offside had it's bearing replaced a while back and has no up and down play. The other side has a little up and down movement. There is no obvious bearing rumble and both hubs spin freely. The other related question I have is what is the role of the shims that are shown in the manual that fit between the end of the axle tube and the back plate/hub assembly?
In case anyone subsequently reads this post with a related problem the following may help. For axles with tapered bearings (F77 on I believe) you need to think of the two halfshafts as one. The thrust is passed from one side to the other via the two halfshafts acting in effect as one shaft. The shims on either side effect not only that side but the load on the bearings on both sides. (The clue is in the manual where it advises after trial fitting the shims, to then equalise the total value of the shims on each side) I made the mistake of thinking that they were independent of each other and left the side I wasn't working on, on the ground. The weight of the vehicle unloads the taper in the bearing and completely distorts the apparent clearance on the other side. You must make the adjustment with both hubs able to move freely to get the correct adjustment.
Any thoughts anyone?
Any thoughts anyone?
David T
you use shims to
you use shims to tighten/loosen bearing play in housings. When you say you have end float, do you mean your pulling on the halfshaft and it pulls outward a few mill? if so its the wear in the tapered bearing.
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To add to the previous
To add to the previous comment, when shimming them always leave them slightly on the loose side, rather than on the tight side.
Thanks Assassin and Mud
Thanks to Assassin and Mud for your comments. Yes, the play is in and out so it looks as if I need new bearings as I guess 3 or 4 mm is excessive. Sorry to be so thick, but I don't understand the point about the shims. They are beyond the bearing housing, between the back of the rear of the bearing housing and the end of the axle tube. How does this adjust the bearing play? What am I not understanding?
David T
its to doo with the fine
its to doo with the fine tolerances in new replacement parts, if you put a new bearing into a casing and doo bolts up for example but cant alter area size you'll basically 'pinch' the new bearing making it tighter than what it needs to be and it wont be able to spin freely, creates premature wear, heat etc etc hope that kinda helps.
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The play should be just a
The play should be just a couple of thou, no more.
As previous post says, shim until it just turns freely.
Thanks again for the
Thanks again for the comments. I still don't understand how the shims being between the back of the bearing assembly and the end of the axle tube makes the adjustment. The shims will have the effect of moving the entire hub and halfshaft assembly either closer or further away from the end of the axle tube. They don't directly effect, at least as I see it,the gap between the two surfaces retaining the bearing. Somewhere I am not understanding the principle involved. Are the two halfshafts designed to touch at the centre point, thus controlling the overall width of the two assemblies as one? If that's the case I can see how the shims would increase or reduce the overall length of the axle tube, allowing the hubs to pinch up more or less as the shims are adjusted. I really appreciate your help.
David T