REPLACING/SERVICING A KLEIN BB UNIT (MASSIVE PICS)

[MRIO]

Hi guys,


I am restoring a '92 Klein Rascal and I have removed the integrated bottom bracket unit by using the original specific toolkit.


Here I show you the toolkit components:

And now...



- PROCEDURE FOR REMOVING A KLEIN INTEGRATED BOTTOM BRACKET SYSTEM


- Prepare the tools (page 25 of the Klein Tech Manual)

- Remove the crank arms. Record the current bottom bracket setting by measuring the total spindle length and the non-drive side
setting (measured from the bottom bracket shell to the end of the Spindle).

- Spray the bearings area with anti-rust/penetrant oil for easy glide during the extraction process (take into account that rust, debris and old Loctite will difficult the extraction process)

- On the non-drive side, place spacer (I) over the spindle followed by the step washer and crank bolt (tighten crank bolt fi nger tight).

- On the drive side, place the rubber guide over the bottom bracket shell.

- Now, slide the steel tube into the rubber guide until it is up against the bottom bracket shell.

- While setting up the main screw (important), maintain a well lubricated main screw during the entire procedure (a light penetrating oil is preferred). Thread on the driver nut all the way followed by the thrust bearing.

- Then place spacer (G) with the shoulders away from the thrust bearing, over the main screw.

- Now, place the entire assembly into the steel tube and thread the main screw into the spindle.

- Hold the main screw in place and thread the driver nut towards the bottom bracket.

- This continued action will extract the entire unit.

- Next photos will show you in "slow motion" what happens during the real process, step by step. What you are going to see now cannot be apreciated on the real process because everything happens inside both the steel tube and the rubber guide.

- Almost finished...

- Finally, it is completely out of the shell!!

Hope it has been interesting for you!!

 

[Enid_Puceflange]

Superb

Attention to detail was exemplary !!
Excellent pics too!

Gc

 

[dyna-ti]

Superb

Attention to detail was exemplary !!
Excellent pics too!

Gc

Absolutely first class job
See if you can add it to the archives

 

[errol]

Cheers very interesting ...

Are we going to get to see new bearings being fitted?

 

[cyb]

eat job
Many many thanks for your interestinf input!
I'm going to do the same job to my pinnacle but without the right tools would be really difficult.
I think I'd made them

cyb

 

[JeRkY]

Nice guide! would be cool to create a number of these types of photo guides for odd retro components in the archive.

 

[timkrik]

Nicely done!

But where does one obtain such a specialized tool? The bearings in my 90 Attitude are in need of replacement.

 

[Thias]

Is it really THAT easy :roll:

Maybe add your elaborate guide to the retrobike workshop wiki
(If you would like to do it and need some help or advice, just ask me )

 

[dahl]

So how to install now when i removed it

 

[Radar]

Re:

Impressive. But looking at that it does make you thankful for the simplicity of modern bottom brackets.