Clutch Slave Alternative

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RohJay

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I've searched the forum trying to find a cheaper solution to Clutch Slave Cylinder replacement.

Someone had mentioned the 1602-2002 Slave Cylinder (part no. 21 52 1 104 269) might be a possibility.

Can anyone confirm this?

Car is '73 CSL - RHD, and the original is part no. 21 52 1 102 060.

Thanks in advance...
 
You could switch to the later style clutch (post 10/73) which has the 'internal clutch release'. The slave cylinder for this setup costs a fraction of the 'external' slave cylinder you currently have.
 
DJSimca said:
You could switch to the later style clutch (post 10/73) which has the 'internal clutch release'. The slave cylinder for this setup costs a fraction of the 'external' slave cylinder you currently have.
Click to expand...

Thanks for the suggestion.
But I have already purchased the correct Clutch Kit for my model, So would prefer to explore a cheaper alternative to the 21 52 1 102 060 Slave Cylinder.

Has anybody attempted this substitution?
 
Bad news/good news (maybe).
2002 slave cylinder won't fit, it is smaller in diameter.
D J Simca's solution requires a new bellhousing and clutch arm.

Have you looked into having your existing cylinder sleeved? Here in the US, there is a company - White Post Restorations - that bores the cylinder to fit a brass sleeve and installs a stainless piston and new seals. Lifetime warranty.

I had the brake master cylinder and calipers from my 2000CS done by them and while costly, I don't have to worry about them again. I did have a problem with a seal in the master cylinder leaking and they replaced it with no problems since.

Surely there are places in England too that specialize in this sort of stuff for "old" cars.
 
Good News - Bad News?

Bill Riblett said:
Bad news/good news (maybe).
2002 slave cylinder won't fit, it is smaller in diameter.
Click to expand...

Hi Bill!

You state the 02 slave cylinder is smaller in diameter. Have you placed both cylinders side by side? Is the length and the location of the locking rings different too?

Would you happen to know exactly how much smaller the diameter is? The stated inside diameters between the two cylinders is roughly 2mm. (The 2002 slave 21521102060 has a diameter of 20.64mm. The 3.0Cs/S slave 21521102060 has a diameter of 22.20mm)

FWIW, the OD of the 3.0 slave is 30mm and if the 02 cylinder is only slightly smaller it might qualify as a sloppy fit that could be externally sleeved, shimmed or built up with some strategically placed spot welds. It remains to be seen whether this would outweigh sleeving an existing cylinder.

(I am embarrassed to say I had a spare 02 slave that I put aside for eventual comparison purposes and have mislaid it. I do not have a spare 02 bell housing to measure either. And if I hadn’t started cleaning up the garage area after seeing some recent pictures of other garages, I would have not had any problem finding things!)

Thanks.

P.s.: some interesting sleeving links:

http://www.brakecylinder.com/sleeve2.htm
http://www.brakecylinder.com/prices2009.htm
http://www.resleeve.com/sleeving.htm
 
And if I hadn’t started cleaning up the garage area after seeing some recent pictures of other garages, I would have not had any problem finding things!)
Click to expand...
Isn't cleaning out the garage the bain of all of our pitiful lives?

Always amazes me too, how things continue... as I thought slavery ended with the US Civil war...!
:mrgreen:
 
MMercury said:

(I am embarrassed to say I had a spare 02 slave that I put aside for eventual comparison purposes and have mislaid it. I do not have a spare 02 bell housing to measure either. And if I hadn’t started cleaning up the garage area after seeing some recent pictures of other garages, I would have not had any problem finding things!)
Click to expand...
I was going by memory, which is not always a good thing.
Now, I can't back up what I said because my garage is all torn up and I can't get at anything!
 
Thank you all for your input.
Special thanks to MMercury for the detailed analysis he PM'd me
I have decided to attempt the substitution: with sleeving, as required, of the outer case to fit the larger 3.0 opening.
Turns out the cost of a new '02 slave + cost of sleeving is somewhat lower than the cost of the rebuild kit alone.
Shall update this thread once its done.
 
Clutch slave cylinder

I replaced mine (72 Euro CS) with a slave from a 2002, forget the source now... 2002.com or something like that. Seems like it was under $40. Fit and works absolutely perfectly (this is the externally mounting slave).
Phil
 
RTHLSS1 said:
Hi Guys,

would slave cylinder from 2002 fit?

https://www.autodoc.si/ate/191972

It is smaller in diamater based on bmwfans

e10 2002

D=20,64MM ATE​

e9

D=22,20MM​

Click to expand...

You may be asking two different questions, will an '02 slave cylinder fit in the E9 bell housing and if it fits, will an '02 slave cylinder function in place of the original equipment E9 slave cylinder? I am unable to offer a definitive/reliable answer to either question, but a side-by-side comparison of the two parts should give you a good idea.

From the standpoint of fitment it is the outside dimensions that are critical. This would also include the location of the snap ring groves required to keep the part it in place. (If the replacement slave cylinder is loose, without proper shimming, it will likely lead to noise and premature wear of the receiving bell housing.) The inside diameters that you listed are potentially less significant. Assuming that the two parts are externally identical, the smaller diameter would likely reduce pedal pressure at the expense of additional pedal travel. In short, depending upon your sensitivity and leg strength, you might never notice the difference.

Accuracy is hardly guaranteed, but the top image is allegely an E9 slave cylinder followed by an alleged image of a 2002 slave cylinder. They look similar, but without carefully measuring each, the proof is in an actual test fit.


An E9 slave cylinder:
42e690d42cd8262edc222a4a31390be9-jpg.36692


Slave cylinder for '02
RHSRS-742618-QJDPW



brilliant-tools-digital-measuring-stick-digital-caliper-measure-equipment-33569116.jpg


autobooks_manual_066.jpg
 
Last edited:
RohJay said:
I've searched the forum trying to find a cheaper solution to Clutch Slave Cylinder replacement.

Someone had mentioned the 1602-2002 Slave Cylinder (part no. 21 52 1 104 269) might be a possibility.

Can anyone confirm this?

Car is '73 CSL - RHD, and the original is part no. 21 52 1 102 060.

Thanks in advance...
Click to expand...
My clutch slave went on the way to work one Saturday morning (I'm a mechanic) knowing BMW didn't used to re engineer stuff for the sake of it I took a gamble and ordered one for an e34 535i (any m30 engined manual will do) the gamble paid off, it fit and worked a treat.
 
gazzol said:
My clutch slave went on the way to work one Saturday morning (I'm a mechanic) knowing BMW didn't used to re engineer stuff for the sake of it I took a gamble and ordered one for an e34 535i (any m30 engined manual will do) the gamble paid off, it fit and worked a treat.
Click to expand...
Excuse my numbness I hadn't realised that the OP had the O2 type slave cylinder
 
FWIW During disassembly of my 1971 2800, upon pulling the trans, I came to removal of the slave cylinder. Upon inspection, I found aluminum tape around the diameter. Closer inspection revealed a 2002 cylinder kluged to fit snugly. I can confirm that the circlip fit appropriately and the slave had been working for however long???. Replacement options are limited as I do not have the original(larger diameter) cylinder. $300 plus seems a lot for a new one. I will likely
use newer style external or reengineer the Kluge.
 
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