Transmission part id

[PipeyD]

I recently rebuilt a 4 speed tranny from a 72 r60/5. There was one piece leftover. One of those things I couldn't reimagine but I know it came from the start of the parts removal. Therefore it would be one of last pieces to put on.

2016-09-17 08.48.22.jpg

When I look at the parts fiche it shows something like it but no part number. Its item "21"

B0000529.png

I just put it there as in the first pic. Seemed like a good thing todo at that time.

Present day-

Working on a 4 speed from a 70 r60/5. That washer part was not in this tranny. It looks like there was the space needed.

2016-09-17 08.58.36.jpg

Is that a real part on the fiche or a coffee stain?
Is there a part number?
It just seems to be a spacer but no part number.
Second tranny didn't have it.
First tranny with extra part still working with about 500 miles of smooth shifting.
I'm thinking its not a critical piece to bmw.

[PAS]

Looks like several possibilities to me.

[jagarra]

I see there is a nice wear mark on the face, does the diameter of that mark give you any clues as to where it goes. That gap by the output flange looks pretty promising if it matches that item.

[tsa]

I've yet to open a four-speed boxer gearbox, but since a) it came out as one of the first parts, and b) from the apparent size, I would guess it could be a distance shim. In the five-speed gearboxes I've worked on, they are 50 mm in diameter (which looks about right, using your fingers as a scale), around 4 mm wide (which looks less than your superfluous part) and between 0.2 and 0.5 mm thick.

Lack of one shouldn't result in an immediate failure, but smooth shifting and wear might get compromised if not fitted as intended. At least, that's what I know about the five-speed 'boxes.

[PipeyD]

I see there is a nice wear mark on the face, does the diameter of that mark give you any clues as to where it goes. That gap by the output flange looks pretty promising if it matches that item.

The wear marks didn't match the location but I still put it there. OOPS

Tsa, here are those spacers I think you refer to.

2016-09-18 19.26.51.jpg

I think it maybe this piece.

2016-09-18 19.29.23.jpg

I probably left it out of the shifting spring mechcanism.
I'll take it apart this week to take a peek. Thousand pictures but not one of the clean and assembled shifter.

[PipeyD]

Well, I tore into and it was the washer in the shift springs. Which had to be part of the very last pieces removed and had to be one of the first to go in. Got it all apart and put back together. Just need to put it back on the bike.