Hi Folks,
I need some wisdom from the early Spitfire guys with cars with tandem master
cylinders. I'm having problems with the primary piston seal. I purchased the
rebuild kit from Vicky Brit (TRF was out of stock). The first attempt resulted
in the primary seal showing a split after I rebuilt the MC and attempted to use
it. I called Vicky Brit and they replaced the seal. The second time around
the seal split while putting it on. I'm pretty sure I'm installing it
correctly, I'm using brake fluid to oil it up and taking my time with it. I
can only see one way on with this thing.
I began to examine the seals (original vs replacement) after I regained my
composure last night. The seals are both made in Australia but are marked
somewhat differently and have different physical dimensions as follows.
Original = Marked as 25 P4640
I.D. = .3275"
O.D. = .7450"
Thickness = .2500"
Replacement = Marked as 24 P4640
I.D. = .2875"
O.D. = .7400"
Thickness = .2400"
I can put the original seal on without too much trouble, but the replacement
simply will not go. I don't think prolonged exposure to brake fluid would
account for the original seal having consistently larger dimensions. My
experience (professional) with seals in fluid handling show that seals tend to
grow in one dimension and not equally. Has anyone else had this same problem?
Is it likely that VB has the wrong seal in the kit?
Thanks for your help.
Bill M.
'70 Spitfire Mk3
|