I have a 4 and didn't know there were differences, but the pressure
plate on the TR4 is the coil spring type and the TR4A - 6 uses the
diaphragm spring. Maybe that figures into the change.
On May 7, 2010, at 2:00 PM, triumphs-request@autox.team.net wrote:
> From: Peter Caldwell <peter@nosimport.com>
> Date: May 7, 2010 10:38:55 AM EDT
> To: triumphs@autox.team.net
> Subject: [TR] TR4 vs 4A clutch piping
>
>
> Cognescenti listerati,
>
> I have a customer who is needing to re-plumb his clutch
> hydraulics. His car is a TR4, as we've determined through the
> years. It seems that what is on the car, though is 4A stuff. (lots
> of it)
>
> Using various original TR manuals, and Moss, et. al., it seems that;
>
> 4s used 3/16 tubing and a rubber flex hose at the slave. The
> fittings would have been a 3/8-24 male single(bubble) flare into
> the master, a length of 3/16 tube, a 3/8-24 female nut single
> flare, rubber hose with a long 3/8-24 male fitting to accommodate a
> nut for a bracket. rubber hose (8") with a 3/8-24 straight fitting
> requiring a copper gasket at the slave.
>
> Whereas
> 4As used 1/4" tubing and a stiffer kind of flex tubing a la 6s at
> the slave.
>
> Both use the same master cylinders, and hence bore diameters.
>
> My questions are: 1) am I correct in the above?
>
> 2) In other cars, when the line diameter changes from
>3/16 to
> 1/4 there is a concurrent change in bore diameters of either the
> master, or the slave, or both. Why not with the 4A, and are there
> advantages of 1 plumbing scheme over the other.
>
> We are thinking that while this car has many parts of both 4s and
> 4As, that it would be best to make it as much a true 4 as possible,
> unless there is a compelling reason to switch to 4A clutch piping.
> Pedal feel?
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