Clutch pedal

Technical MGB discussion
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Mario60
Posts: 54
Joined: Thu Jul 18, 2019 9:34 am
Forename: Mario
Surname: Sciriha
Location: Malta

Clutch pedal

Post by Mario60 »

Hi, hope you are all ok.
Problem this afternoon.
Went to take a drive and felt the clutch pedal soft when pushed and comes back slowly. Checked the oil in the master cylinder and it is ok. Checked manuals and cannot find a similar problem to mine in the fault diagnosis. Any hints what is the problem or where I should look.
Thanks in advance
Mario Sciriha
1972 MGB roadster
1971 MGB GT (for restoration)
1979 Honda CB650Z
1975 Kawasaki S1C 250
1974 Suzuki GT380
1979 Suzuki TS125
Mario60
Posts: 54
Joined: Thu Jul 18, 2019 9:34 am
Forename: Mario
Surname: Sciriha
Location: Malta

Re: Clutch pedal

Post by Mario60 »

Forgot to mention all forward gears seem to engage except the reverse
Thanks
Mario Sciriha
1972 MGB roadster
1971 MGB GT (for restoration)
1979 Honda CB650Z
1975 Kawasaki S1C 250
1974 Suzuki GT380
1979 Suzuki TS125
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Paul Scott
Posts: 227
Joined: Mon Jan 08, 2018 8:48 pm
Forename: Paul
Surname: Scott
Location: Milton Keynes

Re: Clutch pedal

Post by Paul Scott »

Is the return spring missing off the pedal ?
Screenshot_20210904-151646_Acrobat for Samsung.jpg
Regards
Paul
1975 MGB Roadster
Webguru for MGB Register
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Bumpa
Posts: 60
Joined: Sun Dec 13, 2020 9:58 am
Forename: Mike
Surname: Howlett

Re: Clutch pedal

Post by Bumpa »

It sounds like a failure in the hydraulic system giving you clutch drag. The clutch is disengaging part of the way, but not completely. You can engage forward gears because the synchromesh cones in the gearbox allow it, but reverse gear has no synchromesh so the straight cut teeth won't mesh if there is any rotation in the gearbox. Until it is fixed you may be able to get into reverse if you select a forward gear first, and then slide it quickly into reverse. Selecting the forward gear will stop the rotation of the gearbox and allow the clutch to release fully. It would only be a temporary measure. The fault needs to be fixed.

First you should investigate the slave cylinder (pull back the rubber dust boot and see if there is fluid behind it - there shouldn't be any). The flexible hose is also a suspect. With age these can collapse internally bocking the passage of the brake fluid. Unfortunately it is a difficult replacement when the engine is in the car - not impossible but difficult!

If both those are fine or fixed, only the master cylinder remains to be investigated.
Mike
1969 MGB GTV8 3.9 Conversion, 1977 Triumph Dolomite 1850HL, 1971 MGB roadster undergoing restoration.
Mario60
Posts: 54
Joined: Thu Jul 18, 2019 9:34 am
Forename: Mario
Surname: Sciriha
Location: Malta

Re: Clutch pedal

Post by Mario60 »

Thanks for your prompt replies.

Pedal spring is not there and cannot find it in the car. Last time i drove it was fine
Thanks for now

Mario
Mario Sciriha
1972 MGB roadster
1971 MGB GT (for restoration)
1979 Honda CB650Z
1975 Kawasaki S1C 250
1974 Suzuki GT380
1979 Suzuki TS125
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