Juddery clutch pedal

[JonathanT]

So.... on my '99 Chim 450 the clutch pedal moves up and down smoothly when the engine is off. However with the engine on, the movement up and down is now juddery, almost like in steps. Furthermore, if I hold the clutch pedal half way then I don't feel any movement anywhere.

What's going on?

[JonathanT]

I've noticed that when cold there's hardly any juddering but as things warm up, then the juddering gets progressively worse.

[BoostedChim]

I'd start with bleeding the clutch

[JonathanT]

I can look at that - but I don't think that explains how the clutch can move smoothly as soon as I turn off the engine?

[Boosted LS1]

JonathanT said:

I can look at that - but I don't think that explains how the clutch can move smoothly as soon as I turn off the engine?

It hints at something mechanical. Damaged pressure plate fingers perhaps.

[N7GTX]

^^^^ this sounds feasible. The clutch pressure plate 'fingers' may be age/wear hardening and the heat and turning with the engine running may be presenting an uneven face where the release bearing presses. You may even have a 'finger' missing/broken/damaged.

[JonathanT]

I had wondered this (pressure plate fingers) or the release bearing itself. That'll help explain the engine running or not difference. Odd thing is that with the engine running and the clutch pedal depressed any amount I feel no vibration at all.

The feeling is closer to a clutch pedal pivot that needs lubing.

Looks like I've got to get it in and on a ramp etc...

Edited by JonathanT on Thursday 10th March 15:44