29-11-2017, 01:18 PM
(28-11-2017, 01:55 PM)Dennis Nicholas Wrote: A technical question for the engineers.
The A7 has a flanged bush in the bottom of the stub axle to take the king pin (phosphor bronze?). Between that and the axle beam eye there is a thrust washer. The Big 7 is similar except no flange on the lower bush so the thrust washer runs directly on the stub axle and beam axle eyes. The big 7 beam has a recessed area around the bottom of the eye into which the thrust washer partly sits. Big 7 king pin is 5/8 inch dia.
I would obviously like the least possible wear to the stub and beam axle faces. Washers can easily be replaced
The big question is what should the thrust washer be made from????
The first image below shows the bronze thrust washer originally fitted to MG TA / TB / TC - these are available from NTG but of course are the wrong size being I/D 3/4". The Morris Eight however uses 5/8" king pins just like the Big 7 and therefore uses bronze thrust washers of the correct I/D. Unfortunately as far as I'm aware (I also own a 1936 Morris 8 Tourer) the thrust washers are not available separately, only as part of a new king pin set which retails at around £90. The second image shows a Morris 8 king pin set.