Gearbox out and apart
- Thread starter Steptoe
- Start date
Deleted account W
Guest
New camera for your birthday? 
Whatton said:New camera for your birthday?
same camera , got a book on "the history of motorcycles" , whats that all about - anyway, on with the lesson -
while the box is apart, as its a fare old trek around S/america, best change the output shaft, input end bearing, it takes a lot of load, and is usually the bearing that gives up .
Attachments
finglonga
Registered user
Whatton said:New camera for your birthday?
Box Brownie to go with the Dicktaphone?
- Joined
- Jun 26, 2002
- Messages
- 8,329
- Reaction score
- 4
Top Stuff Steptoe...
... I have often fancied buying a written off bike just to strip the gearbox down and see how it works as I just can't imagine from the pictures in manuals. The best to date was on "A Harley is Born" when that Vet chap did up an old 750 Harley and his explanation of the gearbox including selectors was brilliant.(pity I didn't tape it.
Have Fun
AndyT
... I have often fancied buying a written off bike just to strip the gearbox down and see how it works as I just can't imagine from the pictures in manuals. The best to date was on "A Harley is Born" when that Vet chap did up an old 750 Harley and his explanation of the gearbox including selectors was brilliant.(pity I didn't tape it.
Have Fun
AndyT
Deleted account W
Guest
Well I'll ask as I bet theres a lot wondering.
Why do you have to heat the cover up?
Why do you have to heat the cover up?
Think they work by magic. Deleted account 220427002
Registered user
- Joined
- Dec 27, 2003
- Messages
- 20,428
- Reaction score
- 3
heated metal expands so bearings etc will go on easier over shafts
that or he wants to fill it with cheese and ham
over shaftsthat or he wants to fill it with cheese and ham
Whatton said:
the bearings on the gearshafts and shims, fit into the end cover, they're a tight fit and heating it up causes the end cover to expand so you can just drop it on, without any force, that could damage the end cover or the bearings .
Deadskin
Registered user
Love it
B Murr
Registered user
what's the owner going to do if it needs similar work in south america ? Wouldn't it have been good practice for him/her to have a go at it at least?
impressed
oh Mr steptoe, you are always impressive.nice one
oh Mr steptoe, you are always impressive.nice one
Before Christmas did a similar job on a 1979 /7 gearbox where the output shaft bearing had broken up.
After trying to find a good 2nd hand 'box decided to rebuild it.
Just a tip, try local bearing suppliers before you buy from BMW or specialist suppliers. Took all the bearings in and found that they are standard sizes. Don't bother quoting the numbers on them over the phone, these are BMW's own numbers and won't help. My local supplier even had the input shaft seal in stock, Had to order the output shaft seal but it was next day.
Total cost of bearings and seals was about £80. The bearing supplier even let us use their 60 ton press to press the new bearings on! (2nd hand 'box was around £180, no warranty).
The detent spring was replaced as a matter of course as advised by those in the know.
After trying to find a good 2nd hand 'box decided to rebuild it.
Just a tip, try local bearing suppliers before you buy from BMW or specialist suppliers. Took all the bearings in and found that they are standard sizes. Don't bother quoting the numbers on them over the phone, these are BMW's own numbers and won't help. My local supplier even had the input shaft seal in stock, Had to order the output shaft seal but it was next day.
Total cost of bearings and seals was about £80. The bearing supplier even let us use their 60 ton press to press the new bearings on! (2nd hand 'box was around £180, no warranty).
The detent spring was replaced as a matter of course as advised by those in the know.
Similar threads
