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Comet Gearlever Oil Leak

tim welsh

Well Known and Active Website User
Non-VOC Member
I've got an oil leak (spheerol) from the gearlever shaft on the burman box. Has anybody fitted a seal of some kind to this and could help with details? The kickstart had a felt seal that I replaced with an O ring behind a staked in cover, so thats OK.
Thanks
Tim
 

craig

Well Known and Active Website User
VOC Member
Dont have answer about Shift shaft, but what are the details on kick shaft?

I've got an oil leak (spheerol) from the gearlever shaft on the burman box. Has anybody fitted a seal of some kind to this and could help with details? The kickstart had a felt seal that I replaced with an O ring behind a staked in cover, so thats OK. Thanks Tim

Tim, what did you do, exactly, on the shift shaft? please be specific and reference any part numbers of pieces you used, and the vendors you may have purchased from. I think Burman gearboxes could stand some great improvements. Are there any vendors offering a complete update with seals, kick lever inprovement, shifting improvments?
thanks
Craig
 

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vincenttwin

Well Known and Active Website User
VOC Member
Yes this would be well worthwhile item for the spares company to look into .or some one out there with the know ,
PLEASE PUT ME DOWN FOR AN COMPLETE SEAL KIT.
peter
 

nkt267

Well Known and Active Website User
VOC Member
I can't for the life of me remember who told me but it is possible to turn a groove in the outer cover and install an 'O' ring in the gearlever shaft hole to stop the leaks..John
 

clevtrev

Well Known and Active Website User
VOC Member
Simply modify the block that the lever passes through. One seal on the inside,round the shaft, one between the block and cover. O-rings will do the job. The kick start needs machining out to take a lip seal.
 

tim welsh

Well Known and Active Website User
Non-VOC Member
Thanks Trev, I'll give it a go. (maybe winter job - dont want to lose any sunny days)
Thanks as well John - might it have been Trev that told you?!!
 

craig

Well Known and Active Website User
VOC Member
Is there a book on the Vincent Burman gearbox /clutch? Or what is the information available on this subject please?
thank you
craig
 

Hugo Myatt

Well Known and Active Website User
VOC Member
Is there a book on the Vincent Burman gearbox /clutch? Or what is the information available on this subject please?
thank you
craig

There is/was a Pitman book 'The Book of The Burman Gearbox'. It had a blue cover and was about the size of the Richardson Vincent book. I have been after one for years but with no success.
 

ET43

Guest
Hi Hugo,
I have in my grubby little mitt a blue covered book of 29 pages, published by Burman and Sons in 1951. It does not cover the BAP box, but does give excellent drawings on seven pages of both the boxes and clutch used at that time. It covers the heavyweight 4 speed models " C " and " BA " amongst others. If there is sufficient interest, I will get some copies run off.
If a coloured cover is required, the cost will be £5.00 each. For black and white, £3.50 each, plus postage to wherever you live. End of commercial. Gotta pay for the trike somehow! ET43
 

craig

Well Known and Active Website User
VOC Member
Grubby copy

Dear Grubby, please post a payment address, Paypal would be best for me!

I see good Svenska information on Vincent Burman gearbox, why does the same not exist in UK?
 

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biggles

Website User
Non-VOC Member
A bit late with this but I cured all the leaks on my Burman box by machining an o ring groove in the insert in the cover and fitting an o ring I machined a recess in the serrated shaft and fitted an o ring retained by the gear position indicator.
There is a lip seal that is a direct replacement for the felt washer. I have forgotten the size but can find out if anyone is interested .I also have an original copy of the Burman book and some copies if anyone is interested.
Biggles.
 

craig

Well Known and Active Website User
VOC Member
Burman modification details

Hi Biggles, Thanks for your post. Can you provide more details so we can take our covers to a machinist and have these modifications completed? The groove must accomodate a certain oring size? And have a distance from the outside end? width? depth?
Yes, i would request the details on the kickstart shaft lip seal as well. Any other details would be great!
Thank you for posting
Craig
gearselctorshaftoringgroove.jpg
 

craig

Well Known and Active Website User
VOC Member
I also have an original copy of the Burman book and some copies if anyone is interested.
Biggles.

I have some books on the Burman, but none are exactly for C series Comet. I would like a copy if it not something I already have , please. thanks
Craig
 

biggles

Website User
Non-VOC Member
Hi Craig.
If You or anyone else is interested I now work for myself doing light engineering jobs.
I haven't advertised yet as I have been fairly well occupied by doing jobs for people who have heard of me by word of mouth.
I would be able to do these mods for £20.00 plus the price of the o rings and seal which are fairly cheap. also return postage.
All I require would be the insert from the outer cover and the gear selector.
I will however need to take my own cover off to check for sizes or I may be able to work them out from a spare box I have.
I also have to search my records for the seal number.
Let me know if you are still interested.
Cheers.
Biggles.:cool:
 

biggles

Website User
Non-VOC Member
Hi all
The seal part number is C R Industries 6720. this does not give you the size as in Gaco (who are now no longer with us)
the sizes are 1" Od 5/8" bore 1/8" width.It is a spring-less lip seal and requires no modification to the standard cover.
They cost in the region of £4.00+ I can supply them for £3.50 each + postage. If enough interest is shown.
Cheers.
Biggles.
 

biggles

Website User
Non-VOC Member
Regarding the manuals.
I have one original This is a 1960 copy with an original letter from Burmans plus owners notes written on the inside covers.
I also have some copies @£5.00 each + postage and packing I may be able to do some discs if enough interest is shown.
The book covers BA CP and lightweight models. I doesn't cover the Comet specifically but gives all the info needed.
I also have some Photocopies of an article from Motorcycling By Bernal Osbourne on overhauling the Burman with some good drawings and diagrams.
Again I would be willing to get some more copies run off if sufficient interest was Shown
Will have to get a price for copying these.
The original one I was going to put on eBay where they seem to fetch about £18 To £20 If anyone would like to make me an offer in that region + post They can have it.
Cheers again
Biggles:cool:
 

Tom Gaynor

Well Known and Active Website User
VOC Member
A friend told me that he found an Agri-Castrol product called "Self-levelling grease", aka "Pourable grease", which, used in vintage-type boxes like the Burman and Sturmey Archer, (and the worm drive rear axles of Thornycroft cars which leak when SAE 180 is used ), does not leak out. He describes it as a miracle, instant cure. (It avoids the problem of grease thinned with oil, in which the grease and oil do NOT mix, and the oil leaks out.) It has become his "vintage gearbox lubricant of choice". It might not be easy to get in small quantities, but since any farm with a grass cutter will use it in the gearboxes on the cutting discs, doubtless charm and obsequiousness will work as they often do. OK, there's another obstacle, which is that it isn't VERY pourable, and might have to be warmed up to get it into the box.
He also mentioned that farm suppliers hold lubricants in viscosities Halfords don't know exist, like SAE 240, which is potentially useful to know. They probably also stock fling-resistant chain-saw oil, which I know works perfectly in Scottoilers, but is only 1/10 the price of Scottoil.
 
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