Removing the clutch master cylinder from the pedal

[vampire222]

Hi guys, i've decided to revive my 350i after a few years of her being stored. The master cylinder appears to dead as the pedal is soft and there's a little bit of a leak into the footwell. So i've gotten a replacement but i can't seem to find out how to remove the fork that connects it with the clutch pedal. Is it just a push pin? It doesn't appear to be a bolt, or held in place with a pin or anything. Very odd.

Edited by vampire222 on Tuesday 19th May 18:24

[lancepar]

You see the two square tangs sticking up near the nut, then pull them toward you, they clamp with spring pressure to the rod. Once free the pivot pin should wiggle out.

[gmw9666]

This should help...

[vampire222]

wow i'm gonna get it off for sure tomorrow, thanks for the helpful insights! One small step closer to reviving the wedge, hurray!

[colin mee]

Give a spray with wd40 the day before

[adam quantrill]

After it's been in there a while you get grooves worn into the pin which make the wiggling out bit a bit tricky, so shake the pedal while wiggling!

[KKson]

adam quantrill said:

so shake the pedal while wiggling!

Sounds like some new dance craze......

[vampire222]

The pin seemed to be screwed into the fork holding it to the pedalbox. replacing the master cylinder went well (thread on piping to clutch was 3/8 NOT 7/16 weird?) but now for getting that annoying pin back in.....

[vampire222]

Clutch line end is a long 3/8 unf while the hole is for a short one, so it can't go in fully and thus leaks. Does anyone know how to extend it? Is there an adapter for such issues. Other option is to either find another master cylinder with a long thread, or rebuild the old one with the new one (but the piston is really stuck). Suggestions welcome!

Edited by vampire222 on Monday 25th May 17:36

Edited by vampire222 on Monday 25th May 19:00

[adam quantrill]

It isn't supposed to go fully in. The end of the pipe is supposed to be "expanded" (swaged out) and the union traps the pipe end against the slave cylinder, forming the seal there. Maybe the end dropped off the pipe?

[vampire222]

adam quantrill said:

It isn't supposed to go fully in. The end of the pipe is supposed to be "expanded" (swaged out) and the union traps the pipe end against the slave cylinder, forming the seal there. Maybe the end dropped off the pipe?

It was barely going in at all, got another one where the hole is literally 2.5x or 3x as deep so hopefully that will not leak. Luckily the end is still on there!

[carl350i]

Just done the same job on my griffith.

The pivot pin had rusted in, took me over an hour to free it and remove.

[adam quantrill]

Ironically, the application of brake fluid == clutch fluid, penetrates the rust well, if left overnight, job's a good-un.

Sometimes the reason for the change (leaky cylinder) even supplies the fluid!

[carl350i]

I wish that was the case, mine just dripped on the carpet.

I did it before when I got the car about 15 years ago, I’m a bit older now and lying upside down in the footwell brings it all back.