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#214802 - 09/21/08 8:26 pm 6t primary chain case oil leak  
Joined: May 2008
Posts: 37
Triton1974 Offline
BritBike Forum member
Triton1974  Offline
BritBike Forum member

Joined: May 2008
Posts: 37
Buckinghamshire, England
I have a 6t with a dynamo long case primary chain case. Having got the bike back on the road (for the first time in about 30 years)I get quite a lot of oil loss from the primary chain case. Its not coming from the cover joint so assume it comes from the behind the clutch? I was told the chain oil usually finds its level then stops leaking but this seems a little odd to always have large drips under the bike. Any ideas? Many thanks.

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#214812 - 09/21/08 9:31 pm Re: 6t primary chain case oil leak [Re: Triton1974]  
Joined: Jun 2007
Posts: 5,446
HawaiianTiger Online content
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HawaiianTiger  Online Content

BritBike Forum member

Joined: Jun 2007
Posts: 5,446
Maui Hawaii
Well, seal a pre unit primary cover? eh? You and every other pre unit owner would love to fix it. Now, just so happens, just before Triumph went to unit construction, they came up with something that kinda works. They changed the inner cover a tad, made the gearbox mainshaft hole an oval shape. Then they lined the inner side of the sliding washer with a very thin verneer of cork. In the center of the washer they fitted a double grooved ring which was swadged onto the washer. This carried an o-ring which rode upon the ouput gear nose. If you apply some compound like Gaskacinch(sp)a non hardening compound you have a chance of a lot less drips under there. You smear all over where the cork lined washer rides. All you really need to do is fabricate a washer with these features and it will help quite a bit I think. I know this because my bike has this mod. Asking around to the experts about this, I pretty much drew a blank. However, Cliff Rushworth at Ace Classics rekons its a mod for Police bikes of the era. There's no mention of this in any parts book I have ever seen.
Other than that, you could run without oil in there and just spray chain lube on the primary chain. That is if you don't ride very far or very often.
Bill


Bikes
1974 Commando
1985 Honda Nighthawk 650
1957 Thunderbird/T110 "Flying Tiger"
Antique Fans: Loads of Emersons (Two six wingers) plus gyros and orbiters.
#214813 - 09/21/08 9:32 pm Re: 6t primary chain case oil leak [Re: Triton1974]  
Joined: Jun 2007
Posts: 138
rebelpaul Offline
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rebelpaul  Offline
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Joined: Jun 2007
Posts: 138
Essex,England.
Hi,Just a thought,but have you replaced the chaincase screws with the new allen head stainless type?as a similar thing happened to me with my BSA and it turned out to be oil finding its way up the level screw thread,the only way I resolved the problem was to reuse the old level screw!Don't know if that helps!cheers,Paul.


78 TRIUMPH T140v BONNEVILLE
52 TRIUMPH 6T THUNDERBIRD (custom)
64/65 BSA A65 ROCKET (trike)
68 BSA B25 FLEETSTAR

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