Mystery oil pipe

alanengineer · Post by **alanengineer** » Thu Mar 10, 2011 9:45 pm

isnt it a pressure relieve pipe. If so it goes nowhere.
Have a look at your parts book.

g80csp11 · Post by **g80csp11** » Thu Mar 10, 2011 9:46 pm

If it's the one that points downward , it's the oil discharge pipe from the release valve . part No STD-755
The valve releases the crankcase pressure when the piston decends in the bore

it does not connect to anything

MikeM. · Post by **MikeM.** » Thu Mar 10, 2011 11:27 pm

Commonly known as the crankcase breather pipe, it allows grotty oil to drip on your nice clean garage floor when you return from a ride.

SPRIDDLER · Post by **SPRIDDLER** » Thu Mar 10, 2011 11:55 pm

quote:
Commonly known as the crankcase breather pipe, it allows grotty oil to drip on your nice clean garage floor when you return from a ride.

And assume the chaincase is leaking

RUSHTON · Post by **RUSHTON** » Fri Mar 11, 2011 11:02 am

Thanks fellas!
I looked very carefully at my parts book and manual but could find no mention of it, nor in any of the diagrams.
At the moment it is positioned in the vertical position - but I can't remember i f I moved it out of the way at some time. Which way up should it be?
R

alanengineer · Post by **alanengineer** » Fri Mar 11, 2011 11:23 am

I have just had a look at the archives for a '46 single parts book. I can see your problem, Its not half as informative as the later versions. The Main body and valve element are in the diagrams, but thats all you get.

As mentioned above by G80csp11, it the one that points downwards (towards the carpet)

RUSHTON · Post by **RUSHTON** » Fri Mar 11, 2011 11:31 am

Carpet!
This is a War Bike!
Thanks for the info - I'm working off the early WW2 parts list - which does not show pictures of all the parts.
Anyway thanks again for all your help.
R

alfie · Post by **alfie** » Fri Mar 11, 2011 11:38 am

Yep, i have ponderd about this pipe dripping ,
It is the nature of the beast.
Drip trays are very handy

clive · Post by **clive** » Fri Mar 11, 2011 2:36 pm

Does the breather allow suck as well as breathing out? If so it may have been turned upwards if the bike has been used for trials in the past to avoid ingesting water, mud etc. For road use they are usally turned down so that they drip neatly on the garage floor....

itma · Post by **itma** » Fri Mar 11, 2011 4:08 pm

if it faces up it won't work, point it down.