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gunner Offline OP
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The rocker oil feed pipe has broken off on my 68 B44, this is the second time in as many years so I'm wondering if others have had this problem.

The pipe has snapped at the feed line junction just before it enters the junction box.

I'm guessing the failure is due to vibration with the pipe suffering from metal fatigue after a few hundred miles.

The old type rocker feed pipes were made from copper which seemed more durable but the latest type seem to be made from some kind of soft silver metal.

Just wondering if this is repairable or should I buy a new one.


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Have you got a photo of how it’s mounted on the bike Gunner?


Now let’s all have a beer beerchug

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (now rebuilt)
67’ D10 sportsman (undergoing restoration)
68’ D14 trials (undergoing transformation)

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gunner Offline OP
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Just had a quick look and it seems that the pipe isn't broken, instead its popped out of the T junction.

Hopefully I should be able to solder it back on and all will be well.

See pic below.

b44-rocker-feed.jpg

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I believe under the silvery plating (zinc?) there is still copper tubing, copper is prone to fatigue cracking hence the use of rubber hose on one end, its never 100% copper. Look at vintage bike copper fuel and oil pipes for examples of rubber pipes joints and spirals of copper tubing to reduce breaks.

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heating and soldering should help soften /aneal the copper .
your photo looks theres a bit of a crimp and a hard bend at the top ?

see this example for comparison
[Linked Image from bsaunitsingles.com]

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Quote
your photo looks theres a bit of a crimp and a hard bend at the top ?

You may well be right, I haven't taken it off yet for a full inspection but it might be that there was a lack of clearance under the tank when I installed it or it somehow got bent out of true.

Anyway, I think resoldering and straightening should fix it.


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This was for an A10 but might be an alternative to soldering.
[Linked Image from live.staticflickr.com]

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Hmm ........... to my eye it looks like it has pulled out of the fitting rather than "snapped".
Looks like a poor soldering job in the first place with little penetration and flow. Cut back to good pipe, heat up the whole fitting and take apart. clean both pipe and fitting, use a decent flux, use plumbers solder (not electrical). Put a wet rag over the banjos so they don't unsolder.

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Is there one available that would fit the B44?

Gordon


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Originally Posted by Gordon Gray
Is there one available that would fit the B44?

Gordon

not cheap ... https://www.bsaunitsingles.com/item.wws?cpubcode=BSAU&sku=ROCKERFEED
[Linked Image from bsaunitsingles.com]

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gunner Offline OP
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Quote
This was for an A10 but might be an alternative to soldering.

Quote
Is there one available that would fit the B44?

I was wondering if there was a solid billet type available and would use one if it would fit, I guess it would depend on the rocker spindle centers being the same distance apart.

Quote
Put a wet rag over the banjos so they don't unsolder.

Good point, I seem to remember trying this years ago and ended up making a mess of it, with one of the pipes getting blocked, so will take more care next time.

I think the cause may be the tank fouling the pipe as I tightened down the tank center mounting bolt, so will have to check the clearances and mounting rubbers next time around.


Looks good but as suggested not cheap and I suspect the shipping to the UK would be costly.

Last edited by gunner; 06/28/21 7:38 pm.

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The A10 was a custom rockerbox feed with 2.844" centres. The design can be changed to fit others. The pipe can be lowered for more tank clearance. I made custom stainless bolts to replace the original. Using the acorn nuts would be cheaper.

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Originally Posted by quinten
heating and soldering should help soften /aneal the copper .
your photo looks theres a bit of a crimp and a hard bend at the top ?

see this example for comparison
[Linked Image from bsaunitsingles.com]

No it won't
Nowhere near enough energy to induce recrystalization
May be enough for a small amout of stree relief but no where ner enough for annealing .


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Originally Posted by quinten
heating and soldering should help soften /aneal the copper .
your photo looks theres a bit of a crimp and a hard bend at the top ?

see this example for comparison
[Linked Image from bsaunitsingles.com]


If you want reliability, cut that short to a two-inch stub and clamp a length of petrol injection hose onto it.


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I once bought a new silver rocker feed connector for an A65. It was great till I was nearly a days ride from home headed for Eastern creek. The bike was still clean after about 500miles, but about 10 miles out that fitting snapped and covered the engine with R40. On inspection it was a copper casting plated silver, so it just fractured, worth avoiding. I took it right off and jammed the hose over what was left and tried to wipe oil from all the fins and cases.

So a classic bike racing meeting on a bike with oil still running off fins, and the old, 'Oh yes, typical British bike."

[Linked Image from i.postimg.cc]


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I used to make those manifolds for the B40,B44,& B50 and sold them thru Peter Quick. Unfortunately, I made them at my friend Doug's CNC shop in Longmont, Colorado but he has since sold his CNC equipment.

[Linked Image from i.postimg.cc]

They are expensive because they are machined in four different positions on a CNC mill and then hand tapped.

Tom


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Tom, if you are interested, I can get you in touch with the shop that makes my parts. No need to hand tap, the CNC can do NPT threads. Also, the brass fitting can be changed to aluminum or steel.

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Dave,
I made the original drawings from a photograph in a program called "Macdraft", which was not accurate enough and could not be translated into machine language. Doug redrew it into a form that his Morri or his Faddal could interpret and included all the tools and tool paths. I just cut the blanks up to size and put them into the machines pushed the buttons and changed their orientation. I think the Morri Mill did tap the feed hole, but I remember checking them with a NPT tap gauge and having to finish them to fit. A steel elbow with the spigot would probably have looked even better as you suggest. In any case, Doug still has the program as well as a programmable Bridgeport, so if I find myself with nothing else to do, I could probably turn out a few more. I always joked that I worked for 10 cents per hour on these old heaps anyway.
Tom


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Anything worth doing is worth doing well. Steve said that. Anything worth doing well is worth teaching to others. I said that.
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Really nice piece Tom. I have one on my B50.

[Linked Image from live.staticflickr.com]

Scott


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