Author Topic: Major wet sumping while riding.  (Read 922 times)

Offline BSA500

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Major wet sumping while riding.
« on: 14.08. 2018 22:07 »
Riding home from work and bike started to smoke quickly followed by oil pi****g out of the breather. Obviously the oil was not returning and had gone pass the rings.
Background it's an A7 with oil filter conversion 500 miles on from a bottom end rebuild. Recent work replaced sump/timing case and primary case gaskets. It's got an cast iron body oil pump. So check return pipe ball bearing pump and oil lines and filter???

Offline coater87

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Re: Major wet sumping while riding.
« Reply #1 on: 15.08. 2018 00:16 »
 Yes, the oil return is being stopped somewhere.

 The pump continues to pump oil out of the tank, yours cannot find its way back to the tank by the return lines so its coming out the breather.

I would start right at the inlet to the filter (about in the middle of the total return) and see if you have return flow there. then keep moving toward the tank or the motor depending on what you find in that spot.

 Lee
Central Wisconsin in the U.S.

Offline duTch

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Re: Major wet sumping while riding.
« Reply #2 on: 15.08. 2018 04:45 »

 Obviously putting a catch-pan under first
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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Offline BSA500

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Re: Major wet sumping while riding.
« Reply #3 on: 15.08. 2018 07:12 »
Yep that's the plan. Pull the return line off the filter and check for flow

Offline BSA500

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Re: Major wet sumping while riding.
« Reply #4 on: 15.08. 2018 12:29 »
Also I will check for kinked or pinched pipes. My worry is I will check it all and its fine

Offline RoyC

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Re: Major wet sumping while riding.
« Reply #5 on: 15.08. 2018 12:39 »
Does your filter need changing ?
Are your oil pipes the right way round ?
My bike is a 1958 A7SS
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Offline BSA500

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Re: Major wet sumping while riding.
« Reply #6 on: 15.08. 2018 12:56 »
Its done 500 miles with this set up and its a new filter

Online bsa-bill

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Re: Major wet sumping while riding.
« Reply #7 on: 15.08. 2018 13:07 »
Quote
Obviously the oil was not returning and had gone pass the rings.

first bit is correct  but "gone past the rings" - doubt the engine would still fire if that much was going through the cylinders

Quote
Recent work replaced sump/timing case and primary case gaskets.

right the primary case gasket if wrinkled a long the bottom of the case can leak a lot of oil ( found that out last week  *whistle*)

most likely cause from reading your post is the sump, very easy to put it on wrong way around (it's square) thereby blocking oil from getting into the return pipe, the hole for the pipe in the gauze being offset, there is only one correct orientation.
hope you get it sorted
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline BSA500

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Re: Major wet sumping while riding.
« Reply #8 on: 15.08. 2018 13:12 »
It did go pass the rings as I was doing a great impression of the red arrows  *smile*. I will check the gauze as I have been in there recently but it definitely went out the breather.

Offline duTch

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Re: Major wet sumping while riding.
« Reply #9 on: 15.08. 2018 13:16 »

 Did you do the inner timing cover too? If so, could be possible the gasket thickness has upset the breather top-hat end float...?
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
Australia

Online bsa-bill

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Re: Major wet sumping while riding.
« Reply #10 on: 15.08. 2018 13:30 »
Quote
but it definitely went out the breather.

yep if the sump fills up that's where it goes and also up past the rings
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Online ellis

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Re: Major wet sumping while riding.
« Reply #11 on: 15.08. 2018 13:51 »
Make sure the sump is on the right way round and the magnetic drain plug is not under the return pipe. That would stop oil returning back to the tank.

ELLIS

Offline Angus

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Re: Major wet sumping while riding.
« Reply #12 on: 15.08. 2018 13:54 »
When the A10 wet sump recently see https://www.a7a10.net/forum/index.php?topic=13251.msg106487#msg106487 the oil defiantly went past the rings. I actually poured oil out of the left hand exhaust. Did not find a smoking gun in terms of the cause  *dunno* but she seems to not have suffered any ill effects (so far)  :-\
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Offline Topdad

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Re: Major wet sumping while riding.
« Reply #13 on: 15.08. 2018 14:01 »
Just a thought , when you had all this work done did you replace the gasket on the oil pump ,reason for asking is that others have mentioned( john I think  ) that the holes in some of these gaskets are smaller than standard causing problems but while you are checking worth a look .
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Online bsa-bill

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Re: Major wet sumping while riding.
« Reply #14 on: 15.08. 2018 17:26 »

just reading through again BSA500, think I read into it something that was not there, was thinking the oil getting past the rings was from the top, makes more sense it pushing past from the bottom.

My bad as they say (makes no sense to me but you know getting down with the kids and all that)
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco