I'm struggling to find any concrete info regarding the release bearing used for a M20 flywheel conversion on a m52 with the ZF box.
The same answer keeps coming up - e21 323. However, when I search online for them they often come up as being able to fit e30's too. Which makes me inclined to believe that they aren't any longer than the original.
The BMW part number I found is 21511204525, but can anyone confirm this before I go and order one? Or, point me in the right direction to another online?
Any help is greatly appreciated!
Ryan.
M20 flywheel + ZF box - release bearing confirmation?
Moderator: martauto
I don't have the part numbers to hand, but there is an e21 323i M20 bearing that is longer/taller than the E30 M20 bearing - I have recently fitted one to an M52 converted car using an M20 flywheel.
Having seen the price of the longer E21 323i bearing, I personally would be welding some tabs to the clutch fork. This means a standard E30 M20 bearing can be used.
Having seen the price of the longer E21 323i bearing, I personally would be welding some tabs to the clutch fork. This means a standard E30 M20 bearing can be used.
James
'91 325i Sport
'93 318i touring 16v
'91 325i Sport
'93 318i touring 16v
Thanks for the info, I read that the correct one is longer than standard.
Problem is, most websites don't specify the dimensions, and I'm not ordering three different bearings from Germany when I only need one.
Extending is not a bad idea as I have a brand new bearing from my Sachs kit.
Problem is, most websites don't specify the dimensions, and I'm not ordering three different bearings from Germany when I only need one.
Extending is not a bad idea as I have a brand new bearing from my Sachs kit.
The 21511204525 throw out bearing works well in my car with an M20 flywheel and it definitely is longer.
Other people seem to have no problem with the normal throw out bearing so I won't say that you need to spend the extra but my clutch is one of the few things that has worked out perfectly in my conversion.
Other people seem to have no problem with the normal throw out bearing so I won't say that you need to spend the extra but my clutch is one of the few things that has worked out perfectly in my conversion.
Then they haven't driven one with the longer bearing/modified clutch fork (or have used the M20 gearbox so don't need it).TimJ wrote: Other people seem to have no problem with the normal throw out bearing.
I have recently done a back to back swap and the longer bearing is definitely needed. With the standard E30 M20 bearing, the biting point is near the top of the pedal travel and has a very snatchy feel - it's driveable, but not very nice in traffic and if you've driven both you'll realise why its worth modding the clutch fork or using the E21 bearing.
James
'91 325i Sport
'93 318i touring 16v
'91 325i Sport
'93 318i touring 16v
So adding 5mm to the bearing side of the fork and using the standard M20 release bearing works just aswell as the E21 bearing? Is there an exact number in mm to add on or will 5mm be ok?
When i did my conversion on my M50 I modified the bearing so it sat further forward but doesn't seem to have done much. Biting point is at the top of the pedal.
When i did my conversion on my M50 I modified the bearing so it sat further forward but doesn't seem to have done much. Biting point is at the top of the pedal.
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e30rapidic
- E30 Zone Newbie
- Posts: 161
- Joined: Wed Jul 01, 2009 11:00 pm
- Location: Raleigh NC USA
use 21511204525 with the M20 clutch setup and zf trans. I tried it with the regular m20 throwout bearing and the catch point was practically on the floor. I swapped in the 525 part number and its close to where it was when stock.
Dont get that??? did mine with the normal standard size bearing which is used on most bm's M20 M52 and so on... and the biting point was more at top of the pedal only added the extra 5mm cos i was getting a jarring squeak and went after adding the 5mm but the biting was still at the tope30rapidic wrote:use 21511204525 with the M20 clutch setup and zf trans. I tried it with the regular m20 throwout bearing and the catch point was practically on the floor. I swapped in the 525 part number and its close to where it was when stock.
like to know where the biting point on other people on here that did this setup ???
Top of the pedal or on the floor??
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HairyScreech
- Engaged to the E30 Zone
- Posts: 6265
- Joined: Sun Jan 21, 2007 11:00 pm
If you add to the fork make sure you maintain a radius on the pads that touch the bearing tabs or you run the risk of pushing the bearing at an odd angle when the fork moves.
2.8 development thread http://www.e30zone.net/modules.php?name ... c&t=170822
m3.3.1 m20 thread - now running, chip needed - any volunteers?
http://www.e30zone.net/modules.php?name ... =viewtopic&
m3.3.1 m20 thread - now running, chip needed - any volunteers?
http://www.e30zone.net/modules.php?name ... =viewtopic&
I'm running a ZF box, S5D 310Z/320Z, as standard on E36 M3/328.
Using M20 Flywheel and M20 clutch kit. Using the M20 release bearing that came with it.
Brand new E36 328 slave cylinder, standard E36 ZF clutch fork.
All works perfectly, biting point exactly how it was with the standard dual mass on the E36 before. I read up about people using the longer release bearings, modified forks, but just tried without and its fine.
Getrag box might be a different story though I guess.
Using M20 Flywheel and M20 clutch kit. Using the M20 release bearing that came with it.
Brand new E36 328 slave cylinder, standard E36 ZF clutch fork.
All works perfectly, biting point exactly how it was with the standard dual mass on the E36 before. I read up about people using the longer release bearings, modified forks, but just tried without and its fine.
Getrag box might be a different story though I guess.