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#717523 - 12/03/17 1:30 am Oil tank cap on 650SS keeps coming off !  
Joined: Aug 2011
Posts: 52
the tanned gland Offline
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the tanned gland  Offline
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Posts: 52
Australia, N.S.W
Hi everyone, I've recently had a problem with the standard oil tank caps on my 1962 650 SS slimline loosening up & then disappearing off into the scenery despite making sure that they are done up tight before & during each ride, they've never done this before in the 35 years that I've owned her. I've lost two in rapid succession & the only reason I haven't lost a third is because I've chained the bastard on, but even so at the end of a 10 mile ride I'll find it hanging by it's chain & the inside of my right thigh oily : ( Has anyone else had these problems ? The first cap I lost was the original cap & the others are recent purchases but good quality English made ones, at around $55 a pop it's getting a bit expensive !


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#717531 - 12/03/17 4:54 am Re: Oil tank cap on 650SS keeps coming off ! [Re: the tanned gland]  
Joined: Feb 2006
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Ginge Offline
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Ginge  Offline
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Joined: Feb 2006
Posts: 643
Qld, Aust and Otago,NZ
There is no easy fix to this. The caps are not the problem, it's the bike. Keep the cap and send the bike up up to me in Mackay. I'll dispose of it for you.

Can you try an O ring around the threads ( if it's threaded ) or try cutting a fibre washer out of gasket paper or cork. Has the cap got tangs on it that you can tweak or bend?


Ginge
#717536 - 12/03/17 5:33 am Re: Oil tank cap on 650SS keeps coming off ! [Re: Ginge]  
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the tanned gland Offline
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the tanned gland  Offline
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Australia, N.S.W
Nice try Ginge, I think I'll persevere some more just yet ! ; )


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#717575 - 12/03/17 4:59 pm Re: Oil tank cap on 650SS keeps coming off ! [Re: the tanned gland]  
Joined: Apr 2005
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Adam M. Online content
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Adam M.  Online Content
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Posts: 1,599
Mississauga, Ontario.
Is it threaded cap ?

#717587 - 12/03/17 7:38 pm Re: Oil tank cap on 650SS keeps coming off ! [Re: the tanned gland]  
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barncobob Offline
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barncobob  Offline
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Hangtown, CA>
maybe some silicone sealant to keep it from rattling off, easy to remove..

#717590 - 12/03/17 7:55 pm Re: Oil tank cap on 650SS keeps coming off ! [Re: the tanned gland]  
Joined: Sep 2007
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gREgg-K Online content
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gREgg-K  Online Content

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Ottawa, Canada
The oil tank cap is held in place like the Fuel cap: it is holds onto a collar via a 'bayonet' style fitting, and the claws of the cap are tensioned against that fitting with a spring inside the cap. Even if it works loose, the cap should not be able to undo far enough to come adrift, because the cap's claws should stay engaged with the bayonet fitting on the collar.

Could be that your new caps are not engaging the bayonet collar of the tank, or perhaps the collar is worn.

.. Gregg


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#717624 - 12/04/17 3:39 am Re: Oil tank cap on 650SS keeps coming off ! [Re: Adam M.]  
Joined: Aug 2011
Posts: 52
the tanned gland Offline
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the tanned gland  Offline
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Australia, N.S.W
No, it's one of those 'Bayonet' type caps !


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#717625 - 12/04/17 3:44 am Re: Oil tank cap on 650SS keeps coming off ! [Re: gREgg-K]  
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the tanned gland Offline
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the tanned gland  Offline
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Posts: 52
Australia, N.S.W
The collar is good, the bayonet clips on the cap are as new, i was wondering if it might be a build up of pressure in the oil tank, I've checked the breather hole in the cap, I haven't checked the breather tube exiting the tower yet but even so it shouldn't come loose, especially as it's never done anything like this before. The bike runs very smoothly too so I don't think vibration would be playing a major role in this !


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#717634 - 12/04/17 5:39 am Re: Oil tank cap on 650SS keeps coming off ! [Re: the tanned gland]  
Joined: Feb 2006
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Ginge Offline
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Ginge  Offline
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Joined: Feb 2006
Posts: 643
Qld, Aust and Otago,NZ
Can you add a bit of friction by tapping the bayonet indentations inwards towards the collar? Sounds similar to the Triumph oil cap. Spring loaded with a knurled outer ring.

Is the collar and neck on the tank out of round? Just an afterthought.

Last edited by Ginge; 12/04/17 5:41 am. Reason: Had another think...

Ginge
#717983 - 12/07/17 12:28 am Re: Oil tank cap on 650SS keeps coming off ! [Re: Ginge]  
Joined: Aug 2011
Posts: 52
the tanned gland Offline
BritBike Forum member
the tanned gland  Offline
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Joined: Aug 2011
Posts: 52
Australia, N.S.W
I'll give that a try, sounds reasonable as the cap is a type fitted to a lot of British bikes including Triumph & BSA as well. If it works I'll let you know ! : )


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