SMG to 6MT Conversion

[sapote]

I also meant the Gear ID switch, is there anything inside or is that require just the tap? (

Why do you want to get all the trouble of adding the GPS sensor to the 6mt?

[pawelgawel]

For the gear position sensor (GPS), this diagram is actually misleading/incorrect. The gear ID switch (part 12) and the locking pin/thrust pin/spring combo (parts 8/9/10) all go into the same hole which is the one that you tap threads into. Whereas this diagram shows them going into different holes. The hole that the GPS is going into on this diagram does not exist. The thrust pin (10) is what pushes the gear position sensor in when you're in gear, so they all need to go in the same place. It really bothered me when doing this job that this diagram was wrong lol.

THank YOU! I though that might be the issue.. Ok im all god now. thanks!

[ATB88]

Ok, just what I thought ... I have an extra bell-housing already prepped on the side so the detents are fresh, just the 337 area needs a new one. Since the smg uses a blind plug(#5,6,7), how does the MT cap that (#8,10,9)?

I also meant the Gear ID switch, is there anything inside or is that require just the tap? (stupid questions sorry)

For the gear position sensor (GPS), this diagram is actually misleading/incorrect. The gear ID switch (part 12) and the locking pin/thrust pin/spring combo (parts 8/9/10) all go into the same hole which is the one that you tap threads into. Whereas this diagram shows them going into different holes. The hole that the GPS is going into on this diagram does not exist. The thrust pin (10) is what pushes the gear position sensor in when you're in gear, so they all need to go in the same place. It really bothered me when doing this job that this diagram was wrong lol.

[pawelgawel]

Ok, just what I thought ... I have an extra bell-housing already prepped on the side so the detents are fresh, just the 337 area needs a new one. Since the smg uses a blind plug(#5,6,7), how does the MT cap that (#8,10,9)?

I also meant the Gear ID switch, is there anything inside or is that require just the tap? (stupid questions sorry)

[sapote]

can someone specify which COMPRESSION SPRINGS I should swap and replace while the unit is all out?? Im getting a little confused with that part.
I know the position sensor has a different spring and pin in that inlet, aside from this, is there anything else I should change?

3 compression springs that you want to renew:
* odd/even shifter shaft detent: 23317511337
* Reverse detent: 23111222720
* 5/6 gear detent: 23311228393

There is no position sensor in 6mt; only the SMG has 3 sensors: slave clutch, shift shaft linear (odd/even gears) sensor and angular sensor (R, 1/2, 3/4. 5/6 planes).

[pawelgawel]

can someone specify which COMPRESSION SPRINGS I should swap and replace while the unit is all out?? Im getting a little confused with that part.
I know the position sensor has a different spring and pin in that inlet, aside from this, is there anything else I should change?

[pawelgawel]

that looks clean!! nice job

[sapote]

Bell housing machining: The stock manual box used 2 C-clips and rubber caps to hold the Reverse and 5/6 gears detent pins. Machining the grooves for the C-clips is not easy and people had tapped threads for 2 bolts instead (some used the NPT plug bolts which I think could crack the thin and soft aluminum female threads) . I found the following method is good and looks nice. I wish to give credit to the creator but I forgot where I got it.

Detent Cap: An M22 thread is tapped into the detent hole where an OE E46 M3 differential drain plug is used instead of the original Getrag manual transmission rubber cap and circlip. This is done for ease of install and final aesthetics. The rubber caps are fragile and often get torn or bent in the process. The differential drain plug is a perfect fit and has the correct depth for proper detent spring compression.

[sapote]

So people prefer to use the SMG shifter bolt over the 6mt shifter clip/rod for a more solid mount? I thought the bolt was used bc SMG shifter mounted rigidly while the 6mt needs clip/rod for a little movement freedom from the shifter as the latter anchored to chassis.

Edited: the SMG bolt/nut will destroy the rubber bushing of the 6mt shifter arm due to its rough threads. The stock clip/rod has smooth surface acts as bearing.

[heinzboehmer]

1) The 10mm plays was caused by the big coil spring was not bent correctly so when the spring end rested on the stop pin (or bolt), there is gap between the ball bearing and the 5/6 gear detent pin. Adjust the spring end until there is zero play between the ball bearing and the detent pin.

2) I have no idea what is the SMG bolt he was talking about. Anyone?

Part 6 on this diagram is the bolt: https://www.realoem.com/bmw/enUS/sho...diagId=23_0898

I'll mess with my coil spring next time my transmission is out. Mine is an original 6 speed manual though. Mayne the thing has worn over time, but I can't imagine it wasn't bent correctly at the factory.

[sapote]

Do the SMG cars came with the clutch pedal stop buffer #35316750569 already installed? I don't see it listed on the required parts on first post.

[sapote]

I've been chasing a sloppy shifter ever since I got my car. Replaced all bushings multiple times. Latest thing I've done is replace all detent springs in the transmission and upgrade to an AutoSolutions autocross SSK. There was no slop between the transmission and shifter carrier even with the regular pin. There's still about 10mm of side to side play in my shifter.

I've basically given up now and am pretty certain that all the slop that's left is internal to the transmission. Looking at pictures of the bellhousing, there seem to be gaps between the detent bearing and the detent pins, which is potentially the source of the slop. At this point I'm just planning on swapping in an E92 335 transmission whenever I've run out of other things to do.

(Rant over) I you've got slop in that connection though, the SMG bolt thing might be worth doing. It'll also get rid of that stupid pin lol.

1) The 10mm plays was caused by the big coil spring was not bent correctly so when the spring end rested on the stop pin (or bolt), there is gap between the ball bearing and the 5/6 gear detent pin. Adjust the spring end until there is zero play between the ball bearing and the detent pin.

2) I have no idea what is the SMG bolt he was talking about. Anyone?

[sapote]

Yep, it's from a car that came from the factory as a manual. Makes sense now. Wish I'd thought of it before, but it seemed like others have had success doing it this way.
How is this measured and is there a spec for it? It hasn't been run long so I might give it a try if I can track down shims.

Well, carefully with dial indicator one can measure the dimension on the tranny input shaft shoulder relative to the box mating surface, and the dimension of the input bearing to the BH mating surface, then calculate the needed shim thickness to have proper bearing preload.

[sapote]

By the way, I have the instructions to code everything I downloaded a few years back from the old forum. Let me know how to upload them because I have no idea lol.

Could you copy and paste them to your post? This will be very helpful for all members.

[sapote]

Do anyone know what is this Torx screw for? It was listed on the original post.

Torx Screw, micro-encapsulated M8x25

GetBMWParts

23317586637

Edited: It is located on top of the gear box but I don't know what's for. on this diagram: S6s420g inner gear shifting parts