Urgent clutch slave cyl question

[Ferret]

Gents,

Just buttoning everything back up this evening and noticed that the clutch slave cylender is automatically extending to full reach.

It's extending in quite a powerful manner as well, I can only just compress it with one hand, is this normal behaviour for the clutch slave? As in, does it push outwards to balance the release springs and stop everything rattling?

Cheers in advance!

[Ross]

Has the pedal been depressed? Open the bleeder to release the pressure, close the bleeder and it should be okay me thinks.

[Ferret]

Has the pedal been depressed? Open the bleeder to release the pressure, close the bleeder and it should be okay me thinks.

Nope, the clutch pedal hasnt been touched since I took the car apart, I'm wondering if it's something to do with why the clutch has burned out. Will try bleeding up the system tomorrow and see what happens.

[yaofeng]

My guess is you may have accidentally depressed the clutch pedal without knowing. If you only removed the gear box. You don't even need to bleed the clutch. Is there a reason to do it? I think that is why hanging by itself detached from the gear box the push rod extended without resistance provided by the release bearing on the clutch.

[attack eagle]

x2

[Ferret]

My guess is you may have accidentally depressed the clutch pedal without knowing. If you only removed the gear box. You don't even need to bleed the clutch. Is there a reason to do it? I think that is why hanging by itself detached from the gear box the push rod extended without resistance provided by the release bearing on the clutch.

I *know* that the clutch pedal hasnt been pressed... you reckon it's gravity feeding then?

[yaofeng]

It is possible gravity may have extended the pushrod out. But I cannot confirm. One time I accidentally depressed the clutch pedal while the slave was hanging outside of the gear box after completing the 525 clutch. The pushrod shot out of the slave together with the end cap. Both fell to the ground. I had to recrimp the edges of the slave to seal the cap.

[bsell]

I *know* that the clutch pedal hasnt been pressed... you reckon it's gravity feeding then?

How about the clutch pedal rod is adjusted too long, causing the piston inside the clutch master to cover the access hole to the reservoir. Then there is no place for the expanding fluid to go but push back on the throwout bearing.

You know, this inability to flow fluid back to the reservoir as the slave heats up could have taken out the two year-old clutch job...

The way to eliminate my hypothesis is to undo the clutch pushrod from the pedal and see if the master cylinder pushes back a little and your run-away slave calms down. This should be a quick and easy experiment.

I figure there is some spec for the pushrod adjustment but I don't know it...sorry!

How did the flywheel clean up with the sandpaper and water trick?

Brian

[Ross]

Sounds like a winner. I'm pretty sure Ferret was fooling around with clutch adjustment too.
http://www.bimmernut.com/forum/showthread.php?t=38792

[yaofeng]

How about the clutch pedal rod is adjusted too long, causing the piston inside the clutch master to cover the access hole to the reservoir. Then there is no place for the expanding fluid to go but push back on the throwout bearing.

You know, this inability to flow fluid back to the reservoir as the slave heats up could have taken out the two year-old clutch job...

The way to eliminate my hypothesis is to undo the clutch pushrod from the pedal and see if the master cylinder pushes back a little and your run-away slave calms down. This should be a quick and easy experiment.

I figure there is some spec for the pushrod adjustment but I don't know it...sorry!

How did the flywheel clean up with the sandpaper and water trick?

Brian

I don't remember anything adjustable on the clutch pedal when I removed it during the 6 speed conversion. Everything seems to be bolt hole to bolt hole. Am I missing something?