Author Topic: engine breather pipe dripping oil  (Read 496 times)

Offline Signboy

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engine breather pipe dripping oil
« on: 19.09. 2016 21:58 »
i have a 1953 a7 star twin plunger.....after a good run it leaks oil on the drive, about a half a teaspoons worth, i think its coming from the breather pipe ( it faces forward on my bike ) a funny thing is it seems to be worse when on the side stand  but not as bad on the main !   my question is if this is normal, can i re route the tube to lube the chain or into some type of collection bottle ?
atb
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Offline Rocket Racer

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Re: engine breather pipe dripping oil
« Reply #1 on: 20.09. 2016 04:45 »
I don't believe a (small) bit of oil out of a breather is an issue. On my ZB my timing cover breather is routed back into the oil tank overflow (a T piece so the tank still breaths).
On my race engine I run catch bottles and they do collect oil.
The normal A10 breather (on the swing arm motors) is  a timed hole on the drive side cases by the cam end which will flow more if on the sidestand. Just trying to think where a plunger breather feeds from...
A good rider periodically checks all nuts and bolts with a spanner to see that they are tight - Instruction Manual for BSA B series, p46, para 2.
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Offline Signboy

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Re: engine breather pipe dripping oil
« Reply #2 on: 20.09. 2016 07:53 »
Hi Rocket Racer,
I didnt build this particular engine but have paperwork from the previous owner that SRM built it in 1988 ! its done less than 100 miles since then as the previous owner took ill.....ive done over 1000 miles in the past 6 months and noticed the oil drip.
 My other a7 is oil tight although its a '61 swing arm,   the pipe in question is hidden behind the primary chaincase so i cant see where it starts but its attached to the frame with a p clip at the front LHS of the bike .
Im liking the idea of joining the two pipes via a T section tough
atb
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Offline duTch

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Re: engine breather pipe dripping oil
« Reply #3 on: 20.09. 2016 12:09 »

 
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about a half a teaspoons worth,
  *eek* and you're worried  *????*
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the pipe in question is hidden behind the primary chaincase so i cant see where it starts but its attached to the frame with a p clip at the front LHS of the bike .
Not quite sure about this *dunno2*, can't even say where they normally run to, but I run mine into an old juice bottle that also collects any blow off from the oil tank and places I've forgotten about- doesn't seem to catch much

 Maybe when you park up try leaning it on something to the RHS for a bit to let it run back through the cam.
 
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Just trying to think where a plunger breather feeds from...
Unless my medication (None) is playing up *smile*, it's the same as all...either that or put a drip tray under
Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
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