Frank - not all redone by a long shot! Still plenty out there not had the shaft/groove solved.

Simmo, the NORM is for gearbox bearing failure to occur at somewhere over 60,000 miles/100,000km - mine (G/S) blew at around 150,000 km.

If a gearbox wasn't correctly rebuilt previously, it could easily fail much sooner. The bearing end float is CRITICAL. And the only "use-once" bolts are the 4 driveshaft to output spline bolts. Carrying a spare output, input, gearbox k/s shaft seal (if you have one) and gear lever seal is a good idea. Also a RMOS. I carried them all - and never used one.

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I just added the following to the original thread before noticing this, so thought I'd bung it in here too - may or may not add to gsworkshops excellent post above!

RE Gearbox

Simply changing the bearings (and while you're at it make sure you have the circlip, or get a machinist to machine it on the shaft for you) at around 60,000 miles / 100,000 km AND as noted making sure it's getting clean uncontaminated oil is normally sufficient.

In other words:

1. Make sure the speedo cable rubber boot is in good condition - this is where most of the water gets in - running down the speedo cable and past a perished boot.

2. Change the oil at factory intervals with factory recommended oil. Nothing else helps enough to matter imho.

3. REBUILD the gearbox at stated mileage above - all that's needed is to replace all the ball bearings - the roller bearing will easily go double that mileage, and is very expensive.

4. IF you have one of the gearboxes that doesn't have the circlip on the frontend of the output shaft, replace the shaft or get a machinist to machine a groove for the circlip into it.

5. Grease the input shaft spline at 20-30,000 mile /35-40,000 km intervals with the latest BMW recommended grease. NO need to pull the gearbox out, just pull it back a couple inches / 5cm, clean the splines on the shaft with a toothbrush wetted with a little gas or solvent, and then SPARINGLY coat the splines with grease - excess ends up on the clutch and ruins it.

That's really all that they need!

hope that helps...

Grant



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Grant Johnson

Seek, and ye shall find.
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One world, Two wheels.
www.HorizonsUnlimited.com

__________________
Grant Johnson
Seek, and ye shall find.
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Inspiring, Informing and Connecting travellers since 1997!
www.HorizonsUnlimited.com