16-11-2019, 01:20 AM
(This post was last modified: 16-11-2019, 01:22 AM by Bob Culver.)
Various makes have a variety of arrangements and judging from ruined bearings encountered on trailers and old cars many mechanics do not grasp the sublties.
I suspect in the Morris 1000 both bearings are constrained and the spacer length is critical. Overtightening can preload the bearings and eliminate play. With Sevens only the large bearing is fully constrained; super tightening the nut unnecessarily collapses the spacer and acheives nothing. Close scrutiny of the cross section diagram which appears in handbook reprints reveals all. The large bearing must be clamped by the two halves.
Because the kingpin bushes are so closely spaced very little wear allows movement. Again modern inspectors accustomed to no movement get paranoid about this but harmless. The pin must not move in the axle (or be in two pieces! Regualr shaking of the wheel when greasing can detect the latter).
I suspect in the Morris 1000 both bearings are constrained and the spacer length is critical. Overtightening can preload the bearings and eliminate play. With Sevens only the large bearing is fully constrained; super tightening the nut unnecessarily collapses the spacer and acheives nothing. Close scrutiny of the cross section diagram which appears in handbook reprints reveals all. The large bearing must be clamped by the two halves.
Because the kingpin bushes are so closely spaced very little wear allows movement. Again modern inspectors accustomed to no movement get paranoid about this but harmless. The pin must not move in the axle (or be in two pieces! Regualr shaking of the wheel when greasing can detect the latter).