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G: Gearbox Burman Gearbox Sealing

Phil Mahood

VOC Hon. Computer Officer
VOC Member
On behalf of a local B Meteor owner (and VOC member!), can anyone offer tips on sealing up the drive end of the box? Our man is experiencing weapage in that area. The main seal is suspect.

We understand the at the main drive bearing is unique, and therefore sealed versions of it are not likely available. Is there anything better out there these days rather than the standard rubber seal sandwiched between washers? Have to admit its been over 20 years since I've had one on the bench and details are a bit sketchy. Any help is appreciated.

Phil Mahood,
Ontario Section
 

A_HRD

Well Known and Active Website User
VOC Member
Burman Gearbox Bearing - Sealed

Phil,
And/Or he could buy a new, fully-sealed, special SKF Burman drive bearing from me. (Not expensive). :)
I'm coming to the NA Rally and could bring one.
Peter B
Bristol, UK
 

nkt267

Well Known and Active Website User
VOC Member
On behalf of a local B Meteor owner (and VOC member!), can anyone offer tips on sealing up the drive end of the box? Our man is experiencing weapage in that area. The main seal is suspect.

We understand the at the main drive bearing is unique, and therefore sealed versions of it are not likely available. Is there anything better out there these days rather than the standard rubber seal sandwiched between washers? Have to admit its been over 20 years since I've had one on the bench and details are a bit sketchy. Any help is appreciated.

Phil Mahood,
Ontario Section
Hi.I fitted one of these new seals to my bap box and there is no leak from the drive end..leaks can be a problem from just about any entry/exit point on these boxes,which is most likely why they are part filled with grease..I looked at the Panther owners site(I have a later oil filled box on my Comet) and they suggested using heavy grade gear oil.I now have 140 grade morris straight cut gear oil and apart from a faulty gasket have no leaks from the box(the rest of the bike leaves something to be desired!) Using this oil makes sure that the bearings and bushes do not run dry.If you have ever seen a Burman box with a destroyed layshaft bush you will know what I mean..john
 

derek

Well Known and Active Website User
VOC Member
I am in the process of re-building a Burman gearbox and have fitted the main shaft bearing seal. But as I intend to run with oil, I am concerned about oil leaking along the clutch drive shaft through the main shaft bushes! Also is there anyway of sealing the selector shaft where it passes through the inner to outer case, as I can see this filling up.
 

Robert Watson

Well Known and Active Website User
VOC Member
In the middle of doing this to the Two pre war BAP boxes.
1) Peter's bearings plus an external seal fitted to the drive bearing
2) Lay shaft and selector shaft fitted with blind hole bushings so no need for the little tin plates
3) Shorten the k/start shaft outer bush by 1/8 and bore the outer cover to 15/16" X 1/8 deep and fit a CR seal
4) On the CO 54 (gear selector shaft bushing in outer cover) fit an internal O ring
5) CO 90 (Control spindle) fit an external O ring
6) Haven't got to the clutch push rod yet

I think that plugs all the holes. Assemble meticulously

Fill with 80-90 gear oil

Pray

Robert
 

derek

Well Known and Active Website User
VOC Member
Thanks Robert, All very interesting, but I may try to keep the space between the inner cover and outer cover dry. Therefore having to make just the inner cover oil tight. The clutch shaft that I meant, was leakage through the bushes between the input main shaft and the output main shaft. Derek.
 

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