Gearbox rebuild

[Smudge]

Just started a gearbox overhaul on my '89 GS, (rumbling bearings, I think)
Anyhow, didn't get very far before my first obstacle
I have made a puller for removing the output flange, but need slightly longer bolts than the original stretch flange bolts, in order for the puller to engage.
The bolts are M8 but with a fine thread, does anyone know what thread pitch I need to quote when purchasing please
I have seen 1.25, 1.0 and 0.5 pitch bolts, but dont know which I require

Many thanks

 

[MotoRevive]

M8 x 1.25 is standard pitch for an M8
M8 x 1.00 would be classed as fine.

I can't imagine them being 0.5

Don't you have a pitch gauge or a a set of calipers ??

You might be buying a lot more tools and equipment by the time you've put her back together.

 

[Smudge]

Many thanks .... I will order M8 x 1.0
Hopefully got most of the tools and equipment covered, (except for a pitch gauge), we will see

 

[Santa-2512]

Speak to Mikeyboy -

Overland and classic, his advice is first class

BMW use odd pitch stuff

www.realoem.com will give you all the info you need

 

[Smudge]

Cheers Santa ..... just confirmed the thread size on realoem ... thanks for the info

 

[Gelandestrasse]

Smudge, snap, I am doing a rebuild this holiday, too! I'm at the reshimming stage....

 

[Smudge]

Smudge, snap, I am doing a rebuild this holiday, too! I'm at the reshimming stage....

nice one mate ... bit further along than me then
At least I know where to get info. from ....stand by for regular help requests

 

[Gelandestrasse]

Here's my handy end-float calculator

 

[cookie]

I found the problem with trying to calculate the end float on a s/h box was that the depth measurement varies if you check it at 12, 3, 6 and 9 o clock on any given bearing. Do you shim it to the loosest point or the tightest?

An average seems to work.

 

[Smudge]

Here's my handy end-float calculator

 

[Gelandestrasse]

I found the problem with trying to calculate the end float on a s/h box was that the depth measurement varies if you check it at 12, 3, 6 and 9 o clock on any given bearing. Do you shim it to the loosest point or the tightest?

An average seems to work.

I work on the average, too. I'm not the world's best metrologist. For my latest project I used 5 points round the circle.