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Author: Subject: Clutch not disengaging
Charlie C

posted on 1/4/19 at 05:46 AM Reply With Quote
Clutch not disengaging

Iím an ongoing problem with my clutch not disengaging its between an mx5 engine/box I've change the hydraulic system and its still no better. When the engine is off the clutch peddle feels heavy and comes to a stops before it comes to the end of its travel but with the engine turning there isnít enough travel to disengage the clutch and the peddle bottoms out.
Iíve pulled the clutch out and I canít see anything obviously wrong with it, but for a lack of knowing what else to do Iím planning on changing the clutch. The clutch and fly wheel are new and where supplied by a well-known MX5 tuning company as a kit, Iím wondering if the kit is made up of parts the bolt together but donít actually work together, I have noticed that the kit is no longer for sale so I wonder if other people had problems with it.

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Mr Whippy

posted on 1/4/19 at 06:25 AM Reply With Quote
Simple answer it doesn't sound like you have the right parts.
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rusty nuts

posted on 1/4/19 at 07:11 AM Reply With Quote
Check the spigot bearing, if it is a needle roller type fit a new one. Has the clutch ever worked correctly? If not it could be down to the clutch pedal leverage ratio? If it has worked correctly with the original clutch then it could be down to the new clutch/flywheel ? I have had similar problems over the years that I have tried extending the slave cylinder pushrod using a female brake pipe nut , a bodge I know


[Edited on 1/4/19 by rusty nuts]

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Charlie C

posted on 1/4/19 at 08:55 AM Reply With Quote
I may have spotted a potential issue or a red herring, on the fiction plate the built-up area the centre has wear marks which could be from the pressure plate prongs clashing when the clutch is depressed. Iíve look on line and other mx5 friction plates and the donít have this high built up area. In my head this still doesnít explain the change in peddle travel with the engine running.




[Edited on 1/4/19 by Charlie C]

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WallerZero

posted on 1/4/19 at 09:00 AM Reply With Quote
Are the master and slave cylinders MX5 original units or new OEM spec parts etc? I.e. you've not upsized something

Being hydraulic, have they been bled correctly? I didn't think the original set up for the clutch was assisted by the engine via servo or vacuum etc?





http://zachsgbszero.blogspot.co.uk/

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Charlie C

posted on 1/4/19 at 09:11 AM Reply With Quote
Hi

The slave cylinder is standard mx5 tha master is OBP 0.75 which i believe is the same size as the oem cyclinder.
I've bled that system several was from the standard foot down up valve clos valve foot up to pressure bleeding.

I'm at the point where I'm thinking of replacing the clutch with one from a reputable manufacture like Exedy so at least i can cross that off the list.

Iíve been doing some research and the part number on the friction plate comes up as a standard Exedy mx5 plate but instead of disc on both sides but this one has 5 pucks on the transmission side so it could have been a special run commissioned by the seller. Interestingly on the sellers web site the friction plate on the listing is different and doesnít have the high centre area.
The Exedy standard friction plates are 215mm wide and the heavy-duty plates are 220mm, the Exedy standard pressure plates and heavy duty plates look different as well the heavy duty plate have a lot more prongs. Iím thinking that the standard friction plate is not compatible with the heavy-duty pressure plate


[Edited on 1/4/19 by Charlie C]

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Mr Whippy

posted on 1/4/19 at 11:42 AM Reply With Quote
stupid question but why did you not just buy a standard clutch?
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davew823

posted on 1/4/19 at 11:54 AM Reply With Quote
clutch

Any chance that the clutch disc was flipped 180 during installation [wrong side facing the flywheel].
Davew823

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Charlie C

posted on 1/4/19 at 12:07 PM Reply With Quote
Iíve not used a standard clutch because the engine will exceed the torque limit.

The friction plate was in the correct orientation, thatís the fist thing a checked.

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big_wasa

posted on 1/4/19 at 05:13 PM Reply With Quote
I think itís going to be your Obp master cylinder. Do a search. I think there has been a few.

I had one on the brakes where it wouldnít release the pressure on the brakes, locked them solid and would only let them of by bleeding the fluid out of the nipple on the caliper.

Swapped the master and all fixed.

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Charlie C

posted on 3/4/19 at 06:06 AM Reply With Quote
Update

A new MX5 Exedy clutch kit arrived yesterday the pressure plate was visual the same, but the friction plate was 2.5mm thinner so part of the problem could be down to the friction plate being to think on the old clutch. Also, this could have been affecting the peddle throw as the thicker plate would have been depressing the pressure plate spring resulting in the slave cylinder bighting point on the clutch fork being over extended.

When I unpacked the friction plate one of the pucís was damaged where it looked like it had been dropped so Iíve sent it back, and to make things worse when I was printing the return information my printer broke and I had to go and buy a new one which took a long time to set up.

Big-wasa

Iíve not had a problem on my brakes with the OBP master cylinders, but it maybe the or part of the problem so Iíve ordered a wildwood master cylinder with an integral reservoir, the current set up has a remote reservoir which is in an awkward place the integral reservoir will be a better solution.

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Mr Whippy

posted on 3/4/19 at 06:22 AM Reply With Quote
quote:
Originally posted by Charlie C

make things worse when I was printing the return information my printer broke and I had to go and buy a new one which took a long time to set up.




Really? What's wrong with a pen & paper?

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Charlie C

posted on 3/4/19 at 05:07 PM Reply With Quote
Really? Thats the most constructive thing you can respond with how is that helpful.

I'm not very good a drawing bar codes and i'm not sure parcel force would except a hand drawn postage label

[Edited on 3/4/19 by Charlie C]

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big_wasa

posted on 3/4/19 at 06:31 PM Reply With Quote
I just had one cylinder play up that just happened to be on the brakes.
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Charlie C

posted on 11/4/19 at 11:52 AM Reply With Quote
New clutch in and it feels a lot better, the master cylinder with the integrated reservoir is a lot neater as well. Iím planning a test drive after work so fingers crossed the clutch is fixed.
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