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annoying oil leak
#784360 09/15/19 6:32 pm
Joined: Oct 2010
Posts: 47
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Hi, i have a leak that causes more mess than oil loss. Its coming out of the replacement bolt to banjo fitting for the rockers (they all look new) It seems to rely on a taper fit to prevent oil loss? Not sure of the fix for this maybe remove and lap the bolt to the banjo with a little grinding paste?

Many thanks, Steve


Current bikes:
1959 BSA Goldstar DBD34
1939 Velocette KSS. Mk2
Previous bikes:
1966 Velo Thruxton
1960 Velocette Venom Clubman
1939 Velocette 350 Mac
1959 Velocette Venom
1998 Ducati 916
1978 Norton Commando 850
various other stuff
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Re: annoying oil leak
Velo-Felo #784473 09/16/19 1:50 pm
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Velo, did you fix your oil leak? I had a similar leak and lapped the banjo taper with bolt. This and a new fibre washer did the job.

Last edited by 998John; 09/16/19 1:51 pm.
Re: annoying oil leak
Velo-Felo #784507 09/16/19 8:00 pm
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Have you got the standard copper pipe/brass banjo arrangement or one of the aftermarket alloy ones. I fitted one on my A10 many years ago, it pissed oil out because the centres were about 0.5mm out


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Re: annoying oil leak
Velo-Felo #784508 09/16/19 8:01 pm
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Not sure yet John. I did lap them and refitted but then foolishly thought I'd try and get a better alignment of the valve lifter arm. In doing this something must have moved internally? as the lever is now refusing to lift the valve and seems to hit something hard. It moves back and forth but stops hard and I can't move it even with a small extension. Starting without a valve lifter isn't going to be easy!
I wonder if I need to remove the rocker box to see what's going on, I'm not familiar with the set up so wonder if it's gone over can as it were?


Current bikes:
1959 BSA Goldstar DBD34
1939 Velocette KSS. Mk2
Previous bikes:
1966 Velo Thruxton
1960 Velocette Venom Clubman
1939 Velocette 350 Mac
1959 Velocette Venom
1998 Ducati 916
1978 Norton Commando 850
various other stuff
Re: annoying oil leak
Velo-Felo #784510 09/16/19 8:04 pm
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Andy it's been rebuilt by the PO but looks to be a newish pipe and banjo's made of steel and plated?

As you can see above I have another issue to fix!


Current bikes:
1959 BSA Goldstar DBD34
1939 Velocette KSS. Mk2
Previous bikes:
1966 Velo Thruxton
1960 Velocette Venom Clubman
1939 Velocette 350 Mac
1959 Velocette Venom
1998 Ducati 916
1978 Norton Commando 850
various other stuff
Re: annoying oil leak
Velo-Felo #784541 09/17/19 3:30 am
Joined: Feb 2012
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The valve lifter problem is almost certainly because the little lifter cam on the end of the shaft had rotate past the rocker arm (the reason the owners manual says not to use it at high rpm). The 'hard' thing you feel is the cam coming up against the inside of the rocker box. Only you are 'highly skillful' (read: 'lucky') and can rotate the came back onto the cotrect side to act against the rocker, the only option is to lift the rocker box to rotate the cam to the correct orientation.

To the lift the rocker box, unless you have screws from the top into the head (convenient, but offensive to engineering purists) or can get the rocker box studs out from the top (generally unlikely), you will need to lift the head off.

How do I know this? I had exactly the same problem on my DBD, fitted with nice stainless rocker box studs and nuts....I lifted the head to remove the rocker box and reinstalled it with cap screws..aginst my better judgement, but more convenient...exactly as my BB34 cam to me with meany years ago!

Kerry W


No generalisation is wholly true, not even this one.
Oliver Wendell Holmes
Re: annoying oil leak
Velo-Felo #784542 09/17/19 3:32 am
Joined: Feb 2012
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As for rocker feed oil leaks...what a useless design..however, we work with what we have.

I have replaced the OEM copper pipe arrangement on DBD and A10 engines, with the little alloy manifolds from a UK-based company (based in Wales, specializing in BSA and triumph twins, but supplying lots of odd single bits too)..fitted perfectly and never leaked a drop afterwards.


KW


No generalisation is wholly true, not even this one.
Oliver Wendell Holmes
Re: annoying oil leak
Velo-Felo #784722 09/18/19 10:01 pm
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Yes KW, the valve lifter cam had indeed managed to get itself the wrong side of the rocker. I managed to remove the studs so only had to lift the rocker box. I cut a slot in the top of each stud to make it easier to put them in and out. Reset valve clearances and spent a while getting the lifter arm in the right place to work. Surprising how little it needs to move to get the valve to open, just a few thou and it's enough to lose compression.
Made up a tank brace which was missing ( if like velo's it needs it to avoid the tank splitting) and it's all back together again.
Hopefully that's enough jobs for a while!
Thanks for your help. Steve


Current bikes:
1959 BSA Goldstar DBD34
1939 Velocette KSS. Mk2
Previous bikes:
1966 Velo Thruxton
1960 Velocette Venom Clubman
1939 Velocette 350 Mac
1959 Velocette Venom
1998 Ducati 916
1978 Norton Commando 850
various other stuff
Re: annoying oil leak
Velo-Felo #784764 09/19/19 11:04 am
Joined: Feb 2012
Posts: 1,356
Likes: 1
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Good effort Steve - I've seen a few slots cut in the tops of rocker box studs, with varying results! As you say, the valve only need a small lift to drop the compression...imagine the effect of tight valve clearances..

Had a dabble with veils too - had a 66 VMT in the shed alongside the DBD for a bit, a couple of years ago. Having both and able to ride them on the same roads on the same tyres on the same day was interesting and a great argument settler. (I'm not going there on this forum!)

The VMT was all original (apart form being black - it should have been blue). What's your one's number? Mine was 409. Sold, along with the DVD, to pay school fees, sadly..

Cheers
KW


No generalisation is wholly true, not even this one.
Oliver Wendell Holmes

Moderated by  Rich B 

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