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+--- Thread: Oval backplate stub axles. (/showthread.php?tid=6414)
Oval backplate stub axles. - Robert Foreman - 23-07-2021
I'm refurbishing an axle with oval backplate stubs. On removing the old kingpin bushes I noticed that the top and bottom bushes have different outside diameters. The top bush is 11/16" Od and the bottom 41/64".
Every other axle I have rebuilt both bushes are 11/16". Is this a peculiarity of the oval backplate type?
RE: Oval backplate stub axles. - bystander - 23-07-2021
Yes.
Top bush o.d. is as the earlier type, bottom bush o.d. is as the later semi-Girling type (but it's the length of the earlier type)
RE: Oval backplate stub axles. - Tony Press - 24-07-2021
Back in July 2020 I asked:
Can one of our experts advise the correct outside diameter of the standard King Pin Bushes BL 7 and BL 8
The size measured from old bushes-
Lower flanged Bush BL 7: OD 16.2 mm (41/64" ?)
Upper plain Bush BL 8: OD 17.40 mm (11/16" ?)
Measuring our Club stock bushes
Lower flanged bush 17.46 mm
Lower flanged bush16.20 mm
Upper plain bush 17.44 mm
There was no reply to my question so I took the dimensions to be:
Lower flanged Bush BL 7 OD 16.2 mm (41/64")
Upper plain Bush BL 8 OD 17.40 mm (11/16")
Now from the above comments it appears that BL7 and BL8 should both be
Upper and lower Bush BL 7 and BL 8: OD 17.40 mm (11/16")
During 1936, with the new stub axles the bushes became:
Lower flanged Bush 1A4129 OD 16.2 mm (41/64")
Upper plain Bush 1A4128 OD 17.40 mm (11/16")
Is this correct ?
RE: Oval backplate stub axles. - Robert Foreman - 24-07-2021
Thanks for the reply bystander,
I wonder why they made the bottom bush a smaller outside diameter?