• Welcome, Guest! We hope you enjoy the excellent technical knowledge, event information and discussions that the BMW MOA forum provides. Some forum content will be hidden from you if you remain logged out. If you want to view all content, please click the 'Log in' button above and enter your BMW MOA username and password.

    If you are not an MOA member, why not take the time to join the club, so you can enjoy posting on the forum, the BMW Owners News magazine, and all of the discounts and benefits the BMW MOA offers?

Vented Rear Differentials

72r60/7

13278
I found a 3:13 rear differential to replace the ridiculous 2:91 on a 1957 R60. The 3:13 differential housing is vented. (The 2:91 was not)

Does the vent indicate that the seals are compatible with straight wt or multi wt Gear Oil and not 40wt engine motor oil as the original ‘57 was spec’d ?

Charlie



(Patience, $50 and a Bread Loaf Seat were traded for what appears to be be very nice Rear End Unit)
 
I don't think the vent has to do with seal replacement. According to this service bulletin, venting was added in the 1963 timeframe:

http://www.beemergarage.com/documents/200.pdf

But BMW's bulletin in 1966 mentioned changing seals and going to hypoid gear oil in 1966:

http://www.beemergarage.com/documents/233.pdf

I'm not sure you can know what's inside the replacement drive unless you know what bike it was originally on and any potential maintenance.

From some spec pages, it does seem that the 3.13:1 final drive was common on the R60/2 models.
 
Thanks Kurt.
Since I do not know the origin of that replacement rear end, I played it safe and just used the same 40w as in the transmission and engine.

The 3:13 has completely changed the ride for the better. I’m still “dancing around the pole“. Even with the stripped threads (Pig in a Poke) on the new used Rear End, the change is so delightful that no four letter words were involved. I’ll just repair next Winter.

Thanks again,
Charlie
 
Back
Top