Can't wait to hear how it goes. I just split the primary piston seal
for my TR6. The new one should arrive by next tues. I thought that
it was just me - not having the "touch".
I am wondering if warming up the seal in hot water would help -
or hurt?
-Steve
'74 TR6
Bill Munts wrote:
>
> 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
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