If you like our site, please consider joining our club!
By joining you will help ensure that we can continue to provide this service
JOIN HERE!

R50 rocker bearing shaft replacement

Post Reply
User avatar
kenrcruise
Posts: 86
Joined: Tue Apr 05, 2011 12:00 am

R50 rocker bearing shaft replacement

Post by kenrcruise »

I have not done this before. Now that my heads are complete, as is my bottom end, I want to do what I can with the rockers prior to installation.

Years ago I bought a set of NOS rocker bearing shafts. My shop advises that I dismantle the rocker assemblies and check for wear marks, etc. I have done a little looking online but have not had the procedure explained.

Can anyone give me some info or tips?

Regards,

Ken Cruise
Ken Cruise

User avatar
jwonder
Posts: 784
Joined: Wed Nov 23, 2016 7:50 pm
Location: Long Island, New York
Has thanked: 3 times
Been thanked: 7 times
Contact:

Re: R50 rocker bearing shaft replacement

Post by jwonder »

Ken,

Two questions will set your path; is there any play in the rockers on the shaft and have you taken them apart to measure them?

If they are within spec there is no need to replace them. They are likely fine and if so I would put krytox in there and go on your merry way.

I have only found a few sets that needed replacement and that’s likely because they were not getting enough oil, or fresh oil.
James Wonder
Vice President, Vintage BMW Motorcycle Owners
2022 BMW Friend Of the Marque
Long Island, New York

User avatar
kenrcruise
Posts: 86
Joined: Tue Apr 05, 2011 12:00 am

Re: R50 rocker bearing shaft replacement

Post by kenrcruise »

Thank you for taking a moment to reply, James!

I plan to have a careful look at them today. I suppose checking for play is done exactly as in /5 machines. Is there a different type (not flat) of feeler gauge, or another method of measuring clearance between the shafts and rockers?

Again I always appreciate your input!

Regards,

Ken Cruise
Ken Cruise

User avatar
jwonder
Posts: 784
Joined: Wed Nov 23, 2016 7:50 pm
Location: Long Island, New York
Has thanked: 3 times
Been thanked: 7 times
Contact:

Re: R50 rocker bearing shaft replacement

Post by jwonder »

Looking at the workshop manual in our library https://vintagebmw.org/library_data/Wo ... R60S69.pdf on page 29 it says: .0004” to .0018”.

Hope that helps.
James Wonder
Vice President, Vintage BMW Motorcycle Owners
2022 BMW Friend Of the Marque
Long Island, New York

User avatar
kenrcruise
Posts: 86
Joined: Tue Apr 05, 2011 12:00 am

Re: R50 rocker bearing shaft replacement

Post by kenrcruise »

Thanks again James!

Ken Cruise
Ken Cruise

Post Reply