Lockheed clutch master cylinder operation

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lambo911
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Lockheed clutch master cylinder operation

Post by lambo911 » Mon Oct 08, 2018 8:20 am

Hi,

Can anyone help!

My sons SE6a had a softish clutch pedal so we decided to bleed it.

All started fine then I could see air coming down the red pipe from the master. We'd been topping up the reservoir so it wasn't low fluid. And fluid wasn't coming out by the pushrod.

Eventually pressing the pedal up and down wasn't pushing any fluid down to the slave.

So I took the master cylinder off. Even though the reservoir was full the fluid didn't drip out when I removed the clutch pipe. I would also expect if I pressed in the pushrod it would squirt fluid out the pipe hole but nothing came out.

I took it apart and it looks ok, the bore wasn't rusty and the seals still had some shape so I reassembled it but again, no fluid is being pushed through.

Any ideas? Do I just need new seals?

The hole from the reservoir to the bore is clear as when I took the piston out the fluid ran out.


Richard

1978 Scimitar SE6a MOD PS
1977 Scimitar SE6a MOD no PS
1995 BMW M3 GT
1986 Mercedes 190 2.3-16 Cosworth
1966 Jaguar s-type 3.8 MOD

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Lockheed clutch master cylinder operation

Post by AJL Electronics » Mon Oct 08, 2018 8:45 am

It depends on the condition of the bore. No point putting new seals into a worn bore, unless getting it re-sleeved. If you get stuck, I stock new master cylinders for 6a onwards.


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Lockheed clutch master cylinder operation

Post by David Tew » Mon Oct 08, 2018 8:50 am

I suspect the seals are gone. As you already have the cylinder off it's an easy job to clean it thoroughly, including all the bores and drillings, and fit new seals.

Ideally use a honing tool on the main bore as this must be perfectly concentric without any longitudinal scoring.

EDIT: Andy's post got there first :). A new cylinder is a good option if you don't have a hone and at least you can be sure it works correctly.


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lambo911
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Lockheed clutch master cylinder operation

Post by lambo911 » Mon Oct 08, 2018 9:26 am

AJL Electronics wrote:
Mon Oct 08, 2018 8:45 am
It depends on the condition of the bore. No point putting new seals into a worn bore, unless getting it re-sleeved. If you get stuck, I stock new master cylinders for 6a onwards.
Hi Andy, how much is a new one please?


Richard

1978 Scimitar SE6a MOD PS
1977 Scimitar SE6a MOD no PS
1995 BMW M3 GT
1986 Mercedes 190 2.3-16 Cosworth
1966 Jaguar s-type 3.8 MOD

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Lockheed clutch master cylinder operation

Post by AJL Electronics » Mon Oct 08, 2018 9:49 am

lambo911 wrote:
Mon Oct 08, 2018 9:26 am
AJL Electronics wrote:
Mon Oct 08, 2018 8:45 am
It depends on the condition of the bore. No point putting new seals into a worn bore, unless getting it re-sleeved. If you get stuck, I stock new master cylinders for 6a onwards.
Hi Andy, how much is a new one please?
http://ajlelectronics.co.uk/epages/8323 ... ID=8530912


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Lockheed clutch master cylinder operation

Post by Coupe Racing » Mon Oct 08, 2018 9:56 am

Wasn't the query about the clutch Andy ?


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Lockheed clutch master cylinder operation

Post by AJL Electronics » Mon Oct 08, 2018 10:02 am

Glad someone is awake! I still have Manflu so not thinking straight. So, I may have a secondhand one still connected to its slave with a braided pipe. As for new, I need to check...


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Lockheed clutch master cylinder operation

Post by lambo911 » Mon Oct 08, 2018 11:27 am

AJL Electronics wrote:
Mon Oct 08, 2018 10:02 am
Glad someone is awake! I still have Manflu so not thinking straight. So, I may have a secondhand one still connected to its slave with a braided pipe. As for new, I need to check...
A good second hand one would be ok.

Thanks


Richard

1978 Scimitar SE6a MOD PS
1977 Scimitar SE6a MOD no PS
1995 BMW M3 GT
1986 Mercedes 190 2.3-16 Cosworth
1966 Jaguar s-type 3.8 MOD

lambo911
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Lockheed clutch master cylinder operation

Post by lambo911 » Wed Oct 10, 2018 9:05 pm

I've decided to try a new seal kit which has arrived today.

Can anyone tell me how you remove the plastic retainer that goes between the spring and the main seal please. it has a slot in it, do you just lever it open ? I don't want to break it ! :o


Richard

1978 Scimitar SE6a MOD PS
1977 Scimitar SE6a MOD no PS
1995 BMW M3 GT
1986 Mercedes 190 2.3-16 Cosworth
1966 Jaguar s-type 3.8 MOD

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