A: Oil Pipework Chain oiler

davidd

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Michel,

I am not sure if the answer is clear, but the needle valve in the filler neck will not shut off the flow of oil to the chain oiler, it will only moderate the flow, but this is sometimes enough to reduce the oil flow that runs by the tube that goes to the chain oiler. This is because, as Greg mentioned in another post, the chain oiler cannot be closed from the tank filler end. If you look carefully at the square block brazed into the filler neck there is a hole drilled through the timing side of the square block that goes right to the chain oiler tube and bypasses the metering needle.

So, oil can find its way down this open hole that goes right to the chain oiler even with the metering needle closed. It is more usual that air rather than oil can find its way through this hole (if the metering needle is closed) and this hole could easily be used as a breather for the oil tank. If too much oil does find its way down the hole with the metering needle closed also it may be best to block the chain oiler at the rear of the UFM by blocking it with an A26 plug as Russell mentions and several others (including me) have done. You might find some oil weeping from the vent on your oil cap after doing this, but that rarely happens.

David
 

erik

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my oil cap is completely dry,no moisture.and the end of the ufm is completely dry ,too.
 

Michel

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I replaced the needle valve with a tight new PR40 and cleaned the valve seat with compressed air. After a walk of 50km (and the hot oil), it pisses less but still too much. I'm going off the pipe. Thank you for your advices.
 

Michel

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Hello, I'll replace the union nut 234 with blank nut BSP 1/4".
A stupid question from continental, does it BSPT (british standard pipe tapered) or BSPP (british standard pipe parallel) ?
 

Michel

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Thank you Timetraveller.
I am looking for a supplier on the web but I can not find one.
Would you know a webshop that sells it?
 

Michel

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It is not the question that is stupid but the questioner who is it !
Especially that the answer was already above and especially that I have at least three 25 nuts in my stock. I made the transformation and no more a drop of oil. On the other hand, I discovered that the primary chain case overflows while the oil level has been respected. Another mystery to elucidate would have said the Belgian Hercule Poirot ;)
 

timetraveller

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HI Michel, bmetcalf replied before I got round to it. The filling up of the primary chain case is well know to Vincent twin owners and is generally caused by oil flowing through the drive side main bearings into the chain case. Assuming it is only slow then there is no cause for concern. It can be cured by fitting a main bearing oil seal but that is a major undertaking and best left until other work is being done on the bike. If it fills up rapidly then that is another, more serious problem and best looked at soon. It is easily taken care of by undoing the level bolt in the primary chain case cover and draining the oil out every month or two. If it is more rapid than that then you need to have a look at something. There is a scroll system in the drive side main to keep oil flow to a minimum. If that has not been fitted or failed somehow then there is a need for work to be done. That would be unusual so don't panic. Good luck.
 
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