23-10-2019, 10:36 PM
(This post was last modified: 23-10-2019, 10:38 PM by Tony Griffiths.)
(23-10-2019, 10:18 PM)Tony Press Wrote: Interestingly, the new "concentric" cotter shown below has its thread on the centre line of the full diameter.
I assume this is a design Y cotter from the first post, which is the form of some new stock in our spares ?
The final picture showing a design Y cotter in a new brake lever would suggest the new lever could have the cotter hole a fraction low. Some new levers we have taken into spares tock recently are also a very loose fit on the cam shaft.
In comparison to the original Longbridge build parts there are a number of possible error points- the cam shafdt cotter recess, the lever cotter hole position, cam shaft hole diameter in the lever the incorrect cotter form.
Yes, it's the Y cotter - which actually seems to snug in and lock up correctly (once subjected to the essential "fitting" exercise of course). I think that some of the parts I have exhibit all those possible errors you mentioned. What is almost certain to have happened is that suppliers have copied - badly - already incorrectly made items. One wonders if any maker of these and other parts have ever taken the trouble to get hold of original items from an unrestored car and carefully measured and record everything - and then undertaken the production of proper engineering drawings. Even then, post-production quality checking is essential as tolerances do have a tendency to drift as a batch goes through.