I have rebuilt a fair few now and never seen one with a sealed outputshaft bearing ( some heve never been apart from the factory )...
A couple of post with clear pics from people who know what there doing
http://jhau.maliwi.de/mot/gearbox.htm
Strange, I've re-built four boxes and they all had sealed bearings on the rear of the output shaft when I opened them up.
Also, if you follow the 'parts' link in Joerg's document you get this:
"Common spare parts for BMW ""airhead"" gearboxes"
Location "BMW Part No." Type Comment
"Ball bearing primary drive shaft, cover side" "23 12 1 232 695" 6304.C3 "52x20x15, open"
"Ball bearing intermediate shaft, cover side" "23 12 1 232 695" 6304.C3 "52x20x15, open"
"Ball bearing intermediate shaft, cluch side" "23 12 1 233 807" "6304-RS.C3 " "52x20x15, closed on one side"
"Ball bearing output shaft, cover side" "23 12 1 338 466" 6304-2RS.C3 "52x20x15, closed""
Ball bearing output shaft, clutch side" "23 12 1 338 795" 6403.C3 "62x17x17, open"
"Gasket for gearbox housing" "23 11 1 338 596" "Paper-like gasket"
"Shaft seal primary drive shaft/housing" "23 12 1 338 726" 40x26.5x7
"Shaft seal output shaft/housing (Paralever models)" "23 12 1 338 514" 70x40x7
"Shaft seal output shaft/housing (""old"" swingarm models)" "23 12 1 232 681" 66.3x40x7
"Shaft seal on driveshaft (inside the gearbox)" "23 12 1 242 420"
"Shaft seal on switch lever" "23 12 1 338 741" 26x16x7
"Shaft seal (only with kickstarter)" "07 11 9 937 227" "D=14 mm"
"Spring (between segment shaft and mount)" "23 31 1 231 618" "Some people recommend replacing "
"Spring (between lever and mount)" "23 31 1 234 791" "these springs at each gearbox revision"
"Spring (between segment shaft and pawl)" "23 31 1 242 910"
"Spacer ring 0.280 mm" "23 21 1 231 625" "One or more will be required "
"Spacer ring 0.380 mm" "23 21 1 231 626" "to adjust the shaft play."
"Spacer ring 0.500 mm" "23 21 1 231 627"
"Spacer ring 0.200 mm" "23 21 1 233 475"
"All seals and gaskets are also available as a complete Set (""Dichtsatz""):"
"Gasket Set (for Paralever models)" "23 00 1 338 597" "Old number: 23 00 1 338 542"
"Gasket Set (for ""old"" models)" "23 00 1 338 601" "Old number: 23 00 1 242 695"
That is showing a '2RS' bearing on the rear of the output shaft - which is a closed one
Seems he's not taking his own advice.
I have used this list when ordering parts - which match what came out.
I don't suppose it matters much in reality, but I'm curious as to where the discrepancies originated.
Another one of life's little mysteries.
Bob.
