The Spares Company
Club Shop/Regalia
Parent Website
Contact Officials
Machine Registrar
Club Secretary
Membership Secretaries
MPH Editor and Forum Administrator.
Section Newsletters
Technical Databases
Photos
Home
What's new
Latest activity
Forums
New posts
What's new
New posts
Latest activity
Information
Bike Modifications
Machine Data Services
Manufacturers Manuals
Spare Parts Listings
Technical Diagrams
Whitakerpedia (Vincent Wiki)
The Club
MPH Material Archive
Flogger's Corner
Obituaries
VOC Sections
Local Sections
Local Section Newsletters
Miscellaneous
Club Assets
Club History
Club Rules
Machine Data Services
Meeting Documents
Miscellaneous
Essential Reading
Magazine/Newspaper Articles/Letters
Adverts and Sales Brochures
The Mighty Garage Videos
Bikes For Sale (Spares Company)
Log in
Register
What's new
New posts
Menu
Log in
Register
Install the app
Install
Home
Forums
Forums: Public Access
Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Burman 4th Gear Selector Meltdown
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="Matty" data-source="post: 27440" data-attributes="member: 1339"><p>Am interested in your findings Tatty 500, because I may have to have my box apart again some time soon.</p><p>Way back in 1957 my box "blew up" because a tooth came off one of the gears and jammed between two mating gears, bending the mainshaft, cracking the casing and breaking most of the "lip" off behind the output shaft bearing. Being very young and poor at the time I straightened out the mainshaft on a fly press, replaced the damaged gears and got the welder at work to mend the aluminium casing as best he could. </p><p></p><p>This is basically how it has remained for 60,000 miles until a couple of years ago when it seemed to become more noisy and also leak a lot of grease from behind the output bearing onto the chain. I stripped the box and replaced the layshaft (which I found had also been bent) layshaft bearings, third gears etc.</p><p></p><p>I also found that the output bearing was moving a little in the gearbox housing which was the cause of the grease leak, though what lip was left on the inside was OK to stop the bearing going in too far. The only way I could fix it was to put it in with a new oil seal assembly from Dragonfly and some bearing Locktight on the bearing, the shims and circlip.</p><p></p><p>This has worked fine for about 6,000 miles but I notice now that there is a leak of grease which has not been cured as I hoped by using Thixatropic grease which I put in last week when I changed the gear which mates with the output gear, in a fairly successful attempt to cure a whine in 3rd!!</p><p></p><p>I did not remove the gearbox to do this, though may do so in the Winter - but I really need another gearbox case or some serious welding and machining to do the job properly.</p><p></p><p>Will measure all my clearances, meshes etc then, because the box seems to work fine as it is, except for the small grease leak which is for some reason not getting on to the chain but is running down the outside of the breather pipe!!</p><p></p><p>Anybody got a Burman gearbox case to spare please or can advise how to "shim up "the output shaft bearing?</p><p></p><p>Matty</p></blockquote><p></p>
[QUOTE="Matty, post: 27440, member: 1339"] Am interested in your findings Tatty 500, because I may have to have my box apart again some time soon. Way back in 1957 my box "blew up" because a tooth came off one of the gears and jammed between two mating gears, bending the mainshaft, cracking the casing and breaking most of the "lip" off behind the output shaft bearing. Being very young and poor at the time I straightened out the mainshaft on a fly press, replaced the damaged gears and got the welder at work to mend the aluminium casing as best he could. This is basically how it has remained for 60,000 miles until a couple of years ago when it seemed to become more noisy and also leak a lot of grease from behind the output bearing onto the chain. I stripped the box and replaced the layshaft (which I found had also been bent) layshaft bearings, third gears etc. I also found that the output bearing was moving a little in the gearbox housing which was the cause of the grease leak, though what lip was left on the inside was OK to stop the bearing going in too far. The only way I could fix it was to put it in with a new oil seal assembly from Dragonfly and some bearing Locktight on the bearing, the shims and circlip. This has worked fine for about 6,000 miles but I notice now that there is a leak of grease which has not been cured as I hoped by using Thixatropic grease which I put in last week when I changed the gear which mates with the output gear, in a fairly successful attempt to cure a whine in 3rd!! I did not remove the gearbox to do this, though may do so in the Winter - but I really need another gearbox case or some serious welding and machining to do the job properly. Will measure all my clearances, meshes etc then, because the box seems to work fine as it is, except for the small grease leak which is for some reason not getting on to the chain but is running down the outside of the breather pipe!! Anybody got a Burman gearbox case to spare please or can advise how to "shim up "the output shaft bearing? Matty [/QUOTE]
Insert quotes…
Verification
What was Mr Irving's Christian Name?
Post reply
Home
Forums
Forums: Public Access
Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Burman 4th Gear Selector Meltdown
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
Accept
Learn more…
Top