[928uk] Clutch master cylinder

[jon928se at gmail.com]

I can't see what the difference is between LHD and RHD master cylinders, the pressure line to the slave comes out of the end of the master (remote from the pedal) on both and the LHD (928 part number, I have two waiting to be fitted) has the supply (infamous blue hose) hose connection pointing to the front of the car. From memory so does the RHD master supply connection. 

The only difference I know of is that the push rod connection to the pedal is a ball joint on RHD cars (M8 thread ball joint readily available from non Porsche sources John Speake used to sell them) and is a rose joint type joint on LHD cars because the master lines up better with the pin (not ball) on the pedal. I presume that the rose joint fitting isn’t M8. If this assumption isn't correct this isn't a show stopper as you can reuse the original pushrod.

The rebuild kit for the slave is a complete bastard to fit (primarily the pressure seal) and needs to be warmed up in boiling water to make the seal flexible enough to stretch over the piston.

Jon



-----Original Message-----
From: 928uk <928uk-bounces at lists.928.org.uk> On Behalf Of Jonathan Rackowe via 928uk
Sent: 20 January 2025 11:04
To: Ben Hodges <benhodges1975 at gmail.com>
Cc: Jonathan Rackowe <jonathanrackowe at gmail.com>; Mike Miller <auskartdyno at gmail.com>; 928 Org <928uk at lists.928.org.uk>
Subject: Re: [928uk] Clutch master cylinder

Hi Ben,

Had you already considered new seals?

Why do you need to replace the m/c?

I would consider a sleeved rhd one nearer to stock than a lhd one with weird hose routing and lengths.

If you do replace your m/c please sell one of us the old one to recondition.

Have you tried Douglas Valley Breakers for a rhd m/c ?

Best regards,
Jonathan

1991 928 GT Amethyst Metallic


On Sun, 19 Jan 2025, 11:10 pm Ben Hodges via 928uk, <928uk at lists.928.org.uk>
wrote:

> Thanks Mike
>
> I’m converting my auto to a manual so want to keep things stock for 
> now to minimise the variables!
>
> Discussing it with a mate earlier he remembered when he put a new one 
> into his GT it came with two rods - one being longer than the other. 
> I’m going to purchase the 928.xx LHD one and swap the rods over if it 
> is a different length.
>
> Cheers
> Ben
>
> On Sun, 19 Jan 2025 at 20:50, Mike Miller <auskartdyno at gmail.com> wrote:
>
> > I had mine stainless steel sleeved and reduces 1 size in diameter to 
> > give quicker clutch action. Little adjustment on the assist spearing 
> > and pedal effort quite acceptable even for an octanagerian.
> > Mike Miller Brisbane 82s 5 sod
> >
>