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SP250 Clutch Slave Cylinder

wally999999
Posts: 29
Joined: Mon May 16, 2016 10:01 pm

SP250 Clutch Slave Cylinder

Post by wally999999 » Fri Sep 13, 2019 5:31 pm

Hi,

My clutch has started dragging slightly when the car is warm. So, for example, reverse gear graunches slightly when engaging. I haven't touched the clutch for years, so I'm thinking it might be water in the fluid, evaporating when warm, simply some air in the system, or both. A good excuse for taking the slave cylinder off completely and giving the system a flush out and general refresh. I've had a slave cylinder repair kit in stock for years, so thougt I'd simply fit this to the cleaned cylinder. The kit was sold as being for an SP250 and is Lucas (rather than Girling) and marked "308049/02# Clutch Slave Cyl Kit Dart". The trouble is that, having got everything apart, the main seal in the kit is clearly way too small. My cylinder measures at a diameter of 1" but it seems that the seal in the kit is (maybe) 7/8". All the other bits in the kit (boot, circlip & bleed nipple cover) are fine.

Does anyone know if Daimler fitted different slave cylinders over the years? Or maybe the kit I have is for a different "Dart" - a Dodge even!?

Thanks
Attachments
Slave.jpg

migray
Posts: 127
Joined: Fri Feb 26, 2016 10:31 pm
Location: Bakewell

Re: SP250 Clutch Slave Cylinder

Post by migray » Fri Sep 13, 2019 10:17 pm

Well the part number for the slave cylinder is meant to be 308049 (Daimler) the Girling number is 64068867 so I think at least the label for the kit is right.

wally999999
Posts: 29
Joined: Mon May 16, 2016 10:01 pm

Re: SP250 Clutch Slave Cylinder

Post by wally999999 » Fri Sep 13, 2019 11:02 pm

Thanks for the reply. Looking online, it looks as if 7/8" and 1" cylinders were fitted to the SP but I've no idea when, or why. My car is a B Spec. Presumably a 7/8" cylinder has a longer throw (but less mechanical advantage). I've found a kit on eBay for my 1" cylinder. Looks like it was fitted to many cars of the period, including TR3, TR4, etc.
Last edited by wally999999 on Sun Sep 15, 2019 11:25 am, edited 1 time in total.

Warsash 2
Posts: 291
Joined: Sun Feb 28, 2016 1:53 pm

Re: SP250 Clutch Slave Cylinder

Post by Warsash 2 » Sun Sep 15, 2019 10:17 am

Hi
From the Girling Catalogue the Slave Cylinder has 2 numbers 6010230W or SP2036.

Regards

Colin

wally999999
Posts: 29
Joined: Mon May 16, 2016 10:01 pm

Re: SP250 Clutch Slave Cylinder

Post by wally999999 » Sun Sep 15, 2019 11:36 am

Thanks again. I wonder if the clutch internals are different for the two slave cylinder sizes. I'd guess that the clutch itself is the same and that Daimler just fitted two sizes of slave cylinder; maybe to reduce the clutch pedal pressure, or maybe just because they ran out of stock on the assembly line & made a 'tactical substitution' to keep the line running. I used to work for Jaguar Cars & these things do happen at times :)

I'm planning on sticking with my 1" slave cylinder, just in case the internals are different & the throw of the clutch lever needs to stay the same.

User avatar
#100910
Posts: 41
Joined: Sat Feb 13, 2016 2:32 pm
Location: Austin, Texas

Re: SP250 Clutch Slave Cylinder

Post by #100910 » Sun Sep 15, 2019 7:20 pm

The Daimler Catalog references Girling #3010320 for the slave cylinder, but provides no Girling number for the kit.
I installed a Girling cylinder #64068867 (SC303 - Mfr Date : 11/77) many decades ago, but am unable to check its seal part# or size.
The original cylinder fitted in Aug 1961 employed Girling seal #64676889, which is close to the 7/8" mentioned.
Girling slave kit #SP2036 (Mfr Date : 5/72) contains the Girling seal #64673723, which is 1".
(Girling part numbers are stamped on the inside of the outer seal lip)

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Lucas (rather than Girling) and marked "308049/02# Clutch Slave Cyl Kit Dart."
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Is there a label that could be peeled off the Lucas box to see if there is a Girling 'SP' number for the 7/8" kit referenced beneath?

SP Clutch Hyd.PNG

wally999999
Posts: 29
Joined: Mon May 16, 2016 10:01 pm

Re: SP250 Clutch Slave Cylinder

Post by wally999999 » Mon Sep 16, 2019 10:46 am

I've posted a short video here - https://youtu.be/A0-3LrXvcIU

I can't see matches to any of the numbers mentioned ?!

Warsash 2
Posts: 291
Joined: Sun Feb 28, 2016 1:53 pm

Re: SP250 Clutch Slave Cylinder

Post by Warsash 2 » Mon Sep 16, 2019 12:07 pm

Hi
One of the problems with old cars in general is what previous owners have modified. There was a period when stuff Labelled Lucas was made in the Far East and the quality was suspect. I had a number of slave failures. In the end I managed to obtain an original old stock one which works well.
I see from your video and would suggest you order a kit for that number.
Regards
Colin

wally999999
Posts: 29
Joined: Mon May 16, 2016 10:01 pm

Re: SP250 Clutch Slave Cylinder

Post by wally999999 » Mon Sep 16, 2019 1:26 pm

Yes, thanks for this.

As you say, modifications were no doubt made, especially when the cars were perhaps 20+ years old, being run as 'old bangers' on a shoe-string budget and official spares were dwindling.

I would like to know if Daimler built the SPs with two different slave cylinder sizes though - just out of interest. Meanwhile, the 1" cylinder I have has worked fine for the 40 years I've had the car, so a new seal kit of this size should keep me going :)

Andrew

Ian Slade
Posts: 458
Joined: Sat Feb 13, 2016 9:54 am
Location: Akrotiri Cyprus

Re: SP250 Clutch Slave Cylinder

Post by Ian Slade » Mon Sep 16, 2019 5:42 pm

The SP was at its lowest price between the late 60's and the middle 70's the Classic scene took off and the SP with it though albeit slower than some, most SP owners from the early 70's were very keen and mostly good amateur mechanics who strove to keep the cars original, as the price increased the the well off owner appeared and started to modify the cars using commercial garages or specialist "experts" that fitted all sorts of modifications some useful some just to make the ownership easier, why send a fortune on a 5 speed box when an overdrive is more in keeping, don't get me on the subject of r&p steering.
Owner since the 70's, Genghis is slightly to my left.

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