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Clutch master cylinder..?

 
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AlexB



Joined: 26 Feb 2009
Posts: 404
Location: Southport

PostPosted: Mon Apr 18, 2011 4:06 pm    Post subject: Clutch master cylinder..? Reply with quote

Howdy!

I think my clutch has failed. I'm in luck if I can get it into 4th. Just had to do 30 miles in one gear and it wasn't much fun. The master cyl was the guilty cause on my last Allegro so I'm assuming this to be the case again (?)

My car is needing a little more recon than first thought for this years' show season! Rolling Eyes

Cheers,
Alex.
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Colin T



Joined: 13 May 2007
Posts: 1282
Location: N.E. Hampshire

PostPosted: Mon Apr 18, 2011 4:23 pm    Post subject: Reply with quote

You can check for leaky master cylinder seals quite easily by removing the parcel tray, stuffing your head in amongst the pedals, peal back the rubber boot on the master cylinder and look/feel for clutch fluid.

You can also peel back the boot on the slave cylinder and look/feel for fluid that that has got past the cylinder seals. I'd do that first as it's easier to get at.

I don't know why a clutch problem wouldn't affect 4th gear as much as the others, maybe someone else can help with that.
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Richard Howe



Joined: 23 Mar 2010
Posts: 1684
Location: Streatham, South London

PostPosted: Mon Apr 18, 2011 5:10 pm    Post subject: Reply with quote

It's probably down to the torque; the clutch isn't disengaging the engine at any time, but the engine's able to force the clutch to slip without stalling out or causing unwanted movement. I've driven an ADO16 stuck in 3rd because the clutch failed, one foot on the brakes & one on the accelerator meant I could cause just enough drag to keep the car stationary, and just enough grip to allow me to pull away. Not much fun, and I only had to go a couple of miles rather than Alex's 30!

One thing I will say is that my issue wasn't caused by a cylinder failure, but by a vacuum in the system caused by an improper unvented cap on the clutch reservoir. The Allegro uses different caps/reservoirs but it's still worth checking that the system doesn't need bleeding if there's no sign of a leak elsewhere.
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