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General E46 Forum
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Old 10-13-2010, 03:13 AM   #1
blarf
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E39 vs E46 slave cylinder

I'd like to lighten up the clutch a bit. Looking thru bmwfans it looks like the E39 and E46 use the same clutch master cylinder... but the E39 528 uses the same slave as the E36 M3 but the E46 (M3 and non) use a different slave?

Any idea what the bore diameter is for each? Presumably the E39 has a bigger bore and would result in a lighter pedal, correct?
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Old 10-13-2010, 11:23 AM   #2
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Have you driven other manual E46s? I ask because my clutch is plenty light compared to most other car's I've driven. It's heavier than the one in a friend's Civic I drove years ago, but I thought that was video-game light and didn't like it at all... Maybe consider a clutch stop to shorten the pedal throw instead?
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Old 10-13-2010, 11:28 AM   #3
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Probably should have made that clear. I just had a kit put in with a significantly stiffer pressure plate so I'm looking to regain some of that stock effort.
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Old 10-13-2010, 12:13 PM   #4
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Let us know your findings, I'm interested on this as well as I have a stiffer pressure plate as well
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Old 10-13-2010, 02:53 PM   #5
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So okay. Here goes:











P/NChassisDiameterStroke
21 52 1 159 045E36 M42/M44/M50/M52 Z3 M4420.64
21 52 2 226 484E34 M5 3.620.64
21 52 6 775 924Z3 M52/S54, E34 525 M50, E34 530 M60, E36 M3, E3922.20
21 52 6 785 964E83 > 3/0822.20
21 52 1 158 677E34 525 M20, E34 535 M3022.20
21 52 2 282 055E39 M522.2023
21 52 1 161 874E34 540 M60, E31 840 M60, E31 850 S70, E39 540 EARLY 1996 build26.99
21 52 6 785 966E46, E83 X3 < 4/08,E85 Z4????


From the looks of it the E34 540 / E31 850CSi slave is the (only) way to go. Unfortunately it's the one with the highest list price. NAPA wants $180 for the FTE branded version of it.

It looks like the following will interchange with the 540/850 unit:

ATE #040052
Altrom/FTE 21521161874
NAPA New Clutch Pacs NNC 360152

All will be > $100.
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Old 10-15-2010, 02:27 PM   #6
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Quote:
Originally Posted by blarf View Post
I'd like to lighten up the clutch a bit. Looking thru bmwfans it looks like the E39 and E46 use the same clutch master cylinder... but the E39 528 uses the same slave as the E36 M3 but the E46 (M3 and non) use a different slave?

Any idea what the bore diameter is for each? Presumably the E39 has a bigger bore and would result in a lighter pedal, correct?
Can anyone add to the ops question? There must be someone who went with a stiffer pressure plate and upgraded their slave.
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Old 10-15-2010, 02:35 PM   #7
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Can anyone add to the ops question? There must be someone who went with a stiffer pressure plate and upgraded their slave.
The diameter of the E46 slave isn't listed, but if I had to guess I'd say it's a 22mm one like most other BMWs. Non-M E36s used a smaller than normal bore, and the E36 M3 used the normal 22mm bore. My plan is to try to track down an E34 540 / E31 850CSi slave cylinder and see how that works. Unfortunately they're significantly more expensive. Aftermarket and OE are both about $150-$180.

We'll see if I can get used to the action, because save for the increased effort and noise, the new clutch is a treat to use WAY ****ing better than the original ****.
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Old 10-15-2010, 03:11 PM   #8
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Going by your P/N for the E34 540 i found one from the e31 at just above $100.

I might just go ahead and buy it , since i run a increased pressure plate aswell and stop & go traffic is hard on my leg xD
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Old 10-15-2010, 03:32 PM   #9
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Going by your P/N for the E34 540 i found one from the e31 at just above $100.

I might just go ahead and buy it , since i run a increased pressure plate aswell and stop & go traffic is hard on my leg xD
Used or new?

Sachs lists (what I suspect is) the wrong unit, so if you buy from Kragen beware of that. Rockauto has the proper ATE one for about $110, but lists it as not in stock. Considering that slave cylinders are $30-$50 for other BMWs, I'm not too keen on paying $100+ for one that may or may not work properly (there's also the piston travel and mounting to take into consideration).
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Old 10-15-2010, 03:53 PM   #10
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Used or new?

Sachs lists (what I suspect is) the wrong unit, so if you buy from Kragen beware of that. Rockauto has the proper ATE one for about $110, but lists it as not in stock. Considering that slave cylinders are $30-$50 for other BMWs, I'm not too keen on paying $100+ for one that may or may not work properly (there's also the piston travel and mounting to take into consideration).
It's a used one from a M70B50 engine, the place im buing from has a warranty that you can return the item f it doesn't match
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Old 10-15-2010, 04:19 PM   #11
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It's a used one from a M70B50 engine, the place im buing from has a warranty that you can return the item f it doesn't match
Coool. Keep us posted. Which clutch setup are you using?
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Old 10-15-2010, 06:44 PM   #12
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Coool. Keep us posted. Which clutch setup are you using?
UUC Stage 2 Performance Organic(e34 Clucth)
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Old 10-19-2010, 04:43 PM   #13
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So these are the measurements of the e31 slave i've gotten :

Bolt-hole distance: 57 mm
Cylinderdiameter(the unit): 37 mm
Piston stroke: 62 mm (50 mm)

Should i buy it and test ? If anyone can confirm the boltholes are thesame distance then i'll be your testmonkey.
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Old 10-19-2010, 05:03 PM   #14
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Originally Posted by Pir4t View Post
So these are the measurements of the e31 slave i've gotten :

Bolt-hole distance: 57 mm
Cylinderdiameter(the unit): 37 mm
Piston stroke: 62 mm (50 mm)

Should i buy it and test ? If anyone can confirm the boltholes are thesame distance then i'll be your testmonkey.
Can you call the dismantlers and ask them to provide measurements for the standard E46 slave? The cylinder dimension that matters is the inner diameter which should be ~27mm, the outer is mostly irrelevant.
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Old 10-19-2010, 05:24 PM   #15
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Can you call the dismantlers and ask them to provide measurements for the standard E46 slave? The cylinder dimension that matters is the inner diameter which should be ~27mm, the outer is mostly irrelevant.
This is what i asked them to measure , they forgot the piston diameter(bore) but that's already listed in your post.

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Old 10-19-2010, 05:56 PM   #16
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i got the two cylinder from pelican, the FTE one - about 58$ each (600$ at my local dealer!!!)
i recommended you to replace them both because of the wear wont be the same, and it's affect on the old cylinder (that probebly will die in a short time later), - that happend for some of my friend (but in E30), in my case - i replaced them both for my personal peace of mind.
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Old 10-19-2010, 06:15 PM   #17
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i got the two cylinder from pelican, the FTE one - about 58$ each (600$ at my local dealer!!!)
i recommended you to replace them both because of the wear wont be the same, and it's affect on the old cylinder (that probebly will die in a short time later), - that happend for some of my friend (but in E30), in my case - i replaced them both for my personal peace of mind.
I think you're missing the point of this thread , we aren't looking to replace with thesame , we want a bigger bore slave that will ease the pedal effort.
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Old 10-19-2010, 10:30 PM   #18
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Get install it, return it if it doesn't work. Teeming with anticipation of your results.
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Old 10-19-2010, 11:14 PM   #19
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Get install it, return it if it doesn't work. Teeming with anticipation of your results.
Going to measure my boltholes today , if they match ill order it
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Old 10-19-2010, 11:19 PM   #20
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Going to measure my boltholes today , if they match ill order it
This slave was also fitted to early E39 540i/6 models. After a few different master cylinders they settled on an 924 slave on all E39 models. I'd be pretty surprised if the slave didn't fit the transmission. The port for the hydraulic line might be in the wrong place or at the wrong angle, the travel might not let clutch engage completely. Lots of things to maybe go wrong, but I don't think the transmission mounting will be a problem.
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