clutch disengagement
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About a year ago I replaced both master and slave cylinders with new ones. Recently it has been getting more and more difficult to engage gears both at rest and while driving. The pedal feels normal with only slight play before hydraulic resistance is felt. Nevertheless I bled the system with no visible air. Travel of the clutch fork at the slave cylinder rod is approximately 7/16" (11mm) which I think is normal. I'm leaning towards the clutch disc hanging up on the input shaft but want to explore all possibilities before pulling the engine. Any ideas?
Thanks
Chris
Thanks
Chris
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- seniorchristo
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Once you engage 1st gear, how far off the floor does the pedal come up before the car starts to move?
Rob Walker
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26-4889
50-0315N
1964 Sabra GT
1964 Elva Mk4T Coupe (awaiting restoration)
1965 Ford Falcon Ranchero, 302,AOD,9",rack and pinion,disc,etc,etc,etc
1954 Nash Healey LeMans Coupe
Owning a Lotus will get you off the couch
- prezoom
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It may creep slightly but doesn?t really engage until about half way up. Adjustment is also good with about 1/16?+ play at slave pushrod.
Thanks
Chris
Thanks
Chris
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- seniorchristo
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With the engine not running, engage 1st gear a few times and note how easy it is to engage. Then with the clutch fully depressed, start the engine and note if the gear is harder to engage. If it is, you have a dragging clutch, possibly rusty splines, warped clutch plate or possibly spigot bearing seizing to clutch shaft. All will require engine removal unfortunately.
Alan P
Alan P
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It's worth checking there is no movement of the slave cylinder between the gearbox housing and circlip, I needed to shim a couple of mm out of mine
Also the push rod lengths seem to varie on the master cylinder, I ended up using a threaded rod and adjusting it to give full compression of the fluid
Steve
Also the push rod lengths seem to varie on the master cylinder, I ended up using a threaded rod and adjusting it to give full compression of the fluid
Steve
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Panda
Gearbox shifts easily in all gears when not running. But has gradually gotten worse when driving. Slave cylinder seems to have proper travel 7/16" (11 mm)? I'm going to remove gaiter and look inside but I fear the worst.
Thanks
Gearbox shifts easily in all gears when not running. But has gradually gotten worse when driving. Slave cylinder seems to have proper travel 7/16" (11 mm)? I'm going to remove gaiter and look inside but I fear the worst.
Thanks
67 Elan Super Safety
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- seniorchristo
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Sounds to me unfortunately like an internal problem and not hydraulics. Maybe pressure plate springs or disc springs broken affecting engagement. Could be anything really and you won't know until you take the engine out to have a look.
Alan
Currently:-
1971 +2 S130/ 5speed Type 9.
1960 MGA 1600 Mk1 Coupe. 5speed type 9.
Currently:-
1971 +2 S130/ 5speed Type 9.
1960 MGA 1600 Mk1 Coupe. 5speed type 9.
- alanr
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I reckon it's hydraulics. 11mm movement of slave cylinder pushrod when pedal is depressed is not enough. Check the clutch hose to see that it's not internally collapsed.
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Looking at the leverage gained by the fork, movement at the throw out bearing would be about 8 1/2 mm.
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If you can measure the master cylinder pushrod stroke when the clutch pedal is depressed and you know the master cylinder and slave cylinder bore diameters you can calculate what the stroke should be at the slave cylinder.
1970 Ford Escort Twin Cam
1972 Ford Escort GT1600 Twin Cam
1980 Ford Escort 2.0 Ghia
Peugeot 505 GTI Wagons (5spdx1) (Autox1)
2022 Ford Fiesta ST.
1972 Ford Escort GT1600 Twin Cam
1980 Ford Escort 2.0 Ghia
Peugeot 505 GTI Wagons (5spdx1) (Autox1)
2022 Ford Fiesta ST.
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With the car safety on stands and you underneath it, you could remove the release arm boot, shine a light in the bell housing and see what is happening while someone else operates the clutch.
You should be able to see the clutch spring fingers, release bearing, retaining springs etc. and it might show the problem at least.
Dave Chapman.
You should be able to see the clutch spring fingers, release bearing, retaining springs etc. and it might show the problem at least.
Dave Chapman.
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Thanks Dave
That's my plan when I return home next week.
That's my plan when I return home next week.
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If you decide it is the clutch hanging on the splines you could try washing the splines with paraffin before you pull the engine. It will clean and slightly lubricate the splines without making the clutch slip, providing you let it drain and dry for a while before use. It?s worth a try. If you still have to pull the engine, what have you lost?
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