Author Topic: Oil coming from breather on my A10 1961  (Read 565 times)

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M Brook

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Oil coming from breather on my A10 1961
« on: 04 December, 2017, 13:52:48 »
Hi

When I first start my A10 from cold oil leaks from the breather in the engine case behind the primary drive. Once the engine has run a while the oil stops, and I can stop and start the engine and it doesn't leak oil again, until I start it from cold. Any ideas?

Thank you,

Mark   

JulianS

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Re: Oil coming from breather on my A10 1961
« Reply #1 on: 04 December, 2017, 14:23:43 »
Probably wet sumps when parked up log enough to get cold, and on starting up pumps the excess oil out of breather.

Drain the sump when its cold and check how oil comes out. My A10 does not wet sump and when checked this way I usually get about 100ml out. If you get much more than this bike is wet sumping.

M Brook

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Re: Oil coming from breather on my A10 1961
« Reply #2 on: 04 December, 2017, 14:32:13 »
Hi
What do you mean by wet sumping?

Cheers
Mark

M Brook

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Re: Oil coming from breather on my A10 1961
« Reply #3 on: 04 December, 2017, 14:44:47 »
Or and what is the cause of wet sump
« Last Edit: 04 December, 2017, 15:33:20 by M Brook »

M Brook

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Re: Oil coming from breather on my A10 1961
« Reply #4 on: 04 December, 2017, 15:34:07 »
Or and what is the cause of wet sump

DEREKANDERSON8

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Re: Oil coming from breather on my A10 1961
« Reply #5 on: 04 December, 2017, 16:27:11 »
oil is draining from the oil tank into the crankcases via the oil pump, common complaint on british bikes!

google wet sumping

 >:(

JulianS

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Re: Oil coming from breather on my A10 1961
« Reply #6 on: 04 December, 2017, 17:01:54 »
Wet sumping usually caused by the anti syphon valve in sump being obstructed or a worn pump, pump not seating properly on crankcase or the hard to get at non return valve not seating properly. Or a combination of any.

M Brook

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Re: Oil coming from breather on my A10 1961
« Reply #7 on: 04 December, 2017, 17:08:47 »
Hi
Thank you for your answers, sounds like the oil is running back into sump because it only happens after not starting the bike for a week or more. Is there anything I can do about it or just life with it.

Mark

A10 JWO

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Re: Oil coming from breather on my A10 1961
« Reply #8 on: 04 December, 2017, 17:34:32 »
Can of worms this one, you will get many answers on this one and there have been many threads on this over the years.

M Brook

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Re: Oil coming from breather on my A10 1961
« Reply #9 on: 04 December, 2017, 18:33:20 »
Thanks again for advice, I think I will live with it until I have other work to do on the bottom end of the engine. I want install auto advance gear and electronic ignition. I have a couple of questions to ask. I will start new post.

Mark 

Mike Farmer

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Re: Oil coming from breather on my A10 1961
« Reply #10 on: 05 December, 2017, 09:42:08 »
 :)
Having had the same problem I put an anti wet sumping valve in the inlet pipe to the engine. Does the trick. cost about 35. Lots of people use this system.

Mike 8) 8)

M Brook

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Re: Oil coming from breather on my A10 1961
« Reply #11 on: 05 December, 2017, 13:05:39 »
hi Mike
Thank you for your comment, where did you get the anti wet sump valve from and where exactly did you fit it.

Cheers

Mark


Mike Farmer

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Re: Oil coming from breather on my A10 1961
« Reply #12 on: 05 December, 2017, 14:02:16 »
Hi.  :)

Purchased from ebay. Fitted in the pipe line going from the oil tank to the engine. Mine is on my current A50 but I assume they are reasonably the same. I haven't had an A10/A7 for a long time.

So my memory may be in need of slight adjustment.

Mike 8) 8)

Mike Farmer

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Re: Oil coming from breather on my A10 1961
« Reply #13 on: 05 December, 2017, 16:32:25 »
Hi Agen.

Just in case you haven't found it.
.
Its ebay item No401447465843.

Don't know if anyone else has thoughts on this.
Mike 8)

A10 JWO

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Re: Oil coming from breather on my A10 1961
« Reply #14 on: 07 December, 2017, 16:18:47 »
Mike they can fail as we all know and engine goes bang, in line taps also forgotten to turn on BIG BANG.