I'm just setting up my first differential and am following the FSM religiously. But it seems a little unclear regarding preload.
First the pinion gear goes into the housing, and without adding the crush tube, oil slinger or oil seal, the pre-load is set on the bearings. For new bearings this is 1.9 - 2.6 Nm (16.5 - 22.6 inlbs). I have mine sitting at about 2.0 Nm (17.7 inlbs) right now.
Then the ring gear will go in, and the carrier bearing pre-load is set by the adjuster nuts (while maintaining backlash). The FSM says this should add a further 0.4 - 0.6 Nm (3.5 - 5.2 inlbs) of pre-load at the pinion flange.
Then comes the pattern checking and eventually the crush tube etc. go in for the final torquing of the pinion nut, but here the FSM becomes confusing, as it mentions a final pre-load of 1.9 - 2.5 Nm (16.5 - 22.6 inlbs). I accept the difference between 2.5 and 2.6 Nm as a strange rounding error (I have seen it before in other sections), but where has the carrier bearing pre-load gone?
Should I in fact be working towards a final pinion flange move-off torque of 2.3 - 3.1 Nm (20.4 - 27.4 inlbs)? (that's the addition of the pinon and carrier bearing pre-load), or the stated 1.9 - 2.5 Nm? If the latter, why is the intial pre-load of the pinion bearings only, the same as the final pre-load of the whole diff?
Would appreciate any guidance.
First the pinion gear goes into the housing, and without adding the crush tube, oil slinger or oil seal, the pre-load is set on the bearings. For new bearings this is 1.9 - 2.6 Nm (16.5 - 22.6 inlbs). I have mine sitting at about 2.0 Nm (17.7 inlbs) right now.
Then the ring gear will go in, and the carrier bearing pre-load is set by the adjuster nuts (while maintaining backlash). The FSM says this should add a further 0.4 - 0.6 Nm (3.5 - 5.2 inlbs) of pre-load at the pinion flange.
Then comes the pattern checking and eventually the crush tube etc. go in for the final torquing of the pinion nut, but here the FSM becomes confusing, as it mentions a final pre-load of 1.9 - 2.5 Nm (16.5 - 22.6 inlbs). I accept the difference between 2.5 and 2.6 Nm as a strange rounding error (I have seen it before in other sections), but where has the carrier bearing pre-load gone?
Should I in fact be working towards a final pinion flange move-off torque of 2.3 - 3.1 Nm (20.4 - 27.4 inlbs)? (that's the addition of the pinon and carrier bearing pre-load), or the stated 1.9 - 2.5 Nm? If the latter, why is the intial pre-load of the pinion bearings only, the same as the final pre-load of the whole diff?
Would appreciate any guidance.