Hub Carrier, outer Fulcrum Shaft Bearing adjustment ???
#1
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Somebody made a outer fulcrum shaft bearing adjustment???
What I did :
1) fit bearings cups to hub carrier
2) tighten nut at one side of fulcrum shaft
3) secure nut ( with fulcrum shaft) in vice vertically
4) insert oil seal track, bearing, hub carrier, tube, 6 shims ( 4 by 0.005 inch + 2 by 0.007 inch), bearing, oil seal track, spacer ( myself made), nut
5) here is a my question : How much Nm I must tighten the nut ?
6) in instructions told tighten the nut 131-145Nm. I tried tighten to 110Nm and after that, there is no end-float, the bearings move very hard or not moved. And when I disassembled it, the
2 shims were crushed and 4 slightly bent.
7) then I repeat operation Nr. 4, but only insert 4 old shims by 0.007 inch
8) tighten the nut at 41Nm and I received end-float 0.00354 inch , then I tighten the nut at 50-55Nm and I received end-float 0.00315 inch (bearings move normal).
If I will make more torque to the nut, the end-float will be less and shims will be crushed again ???
What the correct torque for the nut, I must to make ??? 131Nm ? 100Nm ? 70Nm ? 50Nm?
How must bearings moving ? easy, normal, hard or very hard?
What I did :
1) fit bearings cups to hub carrier
2) tighten nut at one side of fulcrum shaft
3) secure nut ( with fulcrum shaft) in vice vertically
4) insert oil seal track, bearing, hub carrier, tube, 6 shims ( 4 by 0.005 inch + 2 by 0.007 inch), bearing, oil seal track, spacer ( myself made), nut
5) here is a my question : How much Nm I must tighten the nut ?
6) in instructions told tighten the nut 131-145Nm. I tried tighten to 110Nm and after that, there is no end-float, the bearings move very hard or not moved. And when I disassembled it, the
2 shims were crushed and 4 slightly bent.
7) then I repeat operation Nr. 4, but only insert 4 old shims by 0.007 inch
8) tighten the nut at 41Nm and I received end-float 0.00354 inch , then I tighten the nut at 50-55Nm and I received end-float 0.00315 inch (bearings move normal).
If I will make more torque to the nut, the end-float will be less and shims will be crushed again ???
What the correct torque for the nut, I must to make ??? 131Nm ? 100Nm ? 70Nm ? 50Nm?
How must bearings moving ? easy, normal, hard or very hard?
#2
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What date is your car please? If a pre-HE, setting up the lower hub fulcrum is quite tricky.
You have to set it up with too few shims, then assemble it and measure the endfloat; then add shims to give 1 to 2 thou of preload; then reassemble. It sounds to me like you have loads too much preload, and thus you are jamming the bearings. The shims go between the spacer shaft and the bearings inner races.
You have to set it up with too few shims, then assemble it and measure the endfloat; then add shims to give 1 to 2 thou of preload; then reassemble. It sounds to me like you have loads too much preload, and thus you are jamming the bearings. The shims go between the spacer shaft and the bearings inner races.
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MrAndersonGCC (04-13-2024)
#3
#4
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Today, I finished with outer fulcrum bearings adjustment.
I tighten Fulcrum shaft nuts for 75 Nm, when made an adjustment.
I think in workshop manual was a mistake : there was told (as I understood), tighten the nuts for 135 Nm, when make the bearing adjustment. But the 135 Nm need only for final assembly with wishbone fork.
And today evening I found this information from Kirby Palm book :
"The ROM recommends tightening the trial assembly to 97-107 ft-lb, and the Haynes recommends 95 ft-lb. Basically,
this is final assembly torque. Here, I will differ with the official recommendations and suggest you do not tighten the
trial assembly that much; go to 40-50 ft-lb only.
Here’s the reason: at trial assembly, you will be turning the two nuts against each other, and somewhere in the stack
between them there must be slippage. This slippage will probably occur at the shims. In achieving full assembly torque,
the thin shims may decide they’ve had enough and get ripped out of the stack forcefully by the shear loads. This isn’t a
problem at final assembly, because the ends of the swingarm fork are involved; they positively prevent any twisting
within the stack, and force the nuts to slip on the swingarm fork faces as they are tightened. The shims won’t be harmed
by pure compression."
I tighten Fulcrum shaft nuts for 75 Nm, when made an adjustment.
I think in workshop manual was a mistake : there was told (as I understood), tighten the nuts for 135 Nm, when make the bearing adjustment. But the 135 Nm need only for final assembly with wishbone fork.
And today evening I found this information from Kirby Palm book :
"The ROM recommends tightening the trial assembly to 97-107 ft-lb, and the Haynes recommends 95 ft-lb. Basically,
this is final assembly torque. Here, I will differ with the official recommendations and suggest you do not tighten the
trial assembly that much; go to 40-50 ft-lb only.
Here’s the reason: at trial assembly, you will be turning the two nuts against each other, and somewhere in the stack
between them there must be slippage. This slippage will probably occur at the shims. In achieving full assembly torque,
the thin shims may decide they’ve had enough and get ripped out of the stack forcefully by the shear loads. This isn’t a
problem at final assembly, because the ends of the swingarm fork are involved; they positively prevent any twisting
within the stack, and force the nuts to slip on the swingarm fork faces as they are tightened. The shims won’t be harmed
by pure compression."
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Johnken
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