TD21 Front Suspension Query

For all cars made after 1945
durhamsmudger
Posts: 60
Joined: Thu May 31, 2012 2:30 am
Name: Alan Smith

TD21 Front Suspension Query

Postby durhamsmudger » Sun Sep 03, 2017 4:13 pm

I've started stripping down the front suspension of my Series 1 TD21 and found the pins & bushes, of the upper & Lower Wishbone Trunnions are threaded. I expected to find a simple pin & bush for this assembly . can anyone enlighten me with the following queries :-
1) What is the reason for this design.
2) On reassembly is there any specific setting up method
Thanks
Alan
Cheers
Alan

Peter Martin
Posts: 146
Joined: Tue May 22, 2012 5:26 pm
Name: Peter Martin

Re: TD21 Front Suspension Query

Postby Peter Martin » Mon Sep 04, 2017 9:46 pm

Alan

1 I think I read somewhere that the complicated threaded design was to maximise the contact area between the suspension pin and the trunnion sleeve and thus reduce load /wear on the bearing surfaces.I have seen some very badly worn ones probably due to lack of regular greasing.
2 Set up position is restricted by the flats in the suspension pin and the cotter pins that lock it in position.

Peter

durhamsmudger
Posts: 60
Joined: Thu May 31, 2012 2:30 am
Name: Alan Smith

Re: TD21 Front Suspension Query

Postby durhamsmudger » Wed Sep 06, 2017 6:26 pm

Ive been thinking about this and there are 3 benefits
1) As you said it increases the area , therefore reduces the wear
2) Acts as a thrust location
3) More effective at spreading the grease
Disadvantage - cost of pin & bush
Cheers
Alan


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