Hi. I recently purchased a Navigator and on inspection I've found a few oil leaks (what's the problem, that's normal I hear you say). One being from what appears to be from the gear selector, between the gear selector lever and where the gear indicator marker protrudes from the middle of the lever. Is there a seal in there, is it just worn, it is leaking quite badly from there. I don't have a manual that shows this area in detail, is there one? And, I don't want to go ripping into it if there's an easier fix. I've attached a picture that hopefully helps to explain where I mean. Thank you
The manual for these....
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Hi Ian. Thank you for your…
Hi Ian. Thank you for your reply. I'll strip it and take a look, hopefully it's what you suggest. A manual did come with the bike, but it is very basic and doesn't show much, especially the gearbox section, it shows a grainy exploded gearbox with all the parts numbered but no key to the numbers. The kick-start is dry, the only leak on the box is from the middle of the selector. Regards Phil
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Oil leaks
Hi Philip,
The gearbox on lightweight twins often leaks slightly as you have found out. I don't know the year of yours, but in 1964 the gearbox oil level plug changed position.
The oil must be kept up to the level hole.
At this level the layshaft and kick-start shaft are half immersed in oil and the critical layshaft bushes are lubricated.
I fear that your 'not leaking' kick-start spindle is merely a sign that your gearbox oil level is too low.
I recommend using 6mm x 2mm o-ring in the gear indicator spindle. Two required. These have a 10mm outside diameter and are a good seal. Those from NOC are the imperial size and sealing can be a bit marginal.
The square section seals from NOC are good for selector shaft and kick-start.
Peter
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Gearbox Seals.
Hi Peter.
Thank you for your reply. Do you happen to know the part numbers for the square section seals, as i can't find them on the shop site. Many Thanks
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Quad seals
Quad seals for kick-start shaft and gearchange shaft are the same.
NOC part number 040006Q
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... is pretty sketchy at the best of times and lacks exploded diagrams of many of the important bits. However, there are O rings on the ratchet plate spindle which may be the source of your leaks. There are also O rings on the kickstart and gearchange spindles which can be exchanged for X ring type - I'm currently corresponding with Andy Sochanik re alternatives here.
You can get a photocopy manual from the club or from BMS at the National Motorcycle Museum.