Author Topic: Smoking after installing return line oil filter  (Read 2781 times)

Offline isuzu

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Hi All,
I  did 2 modifications this winter to get the A7 1956 better;
- new carburettor that should be on this bike. Well it is definitely running better with that.
- oil filter into the return line. After doing this I started and saw oil getting back into the tank. Now the weather is nice I made short trip. Short because after a short while I saw smoke coming out of the exhausts (grey white). Also dripping oil from the engine carter.
So I think when driving the oil cannot be pumped quick enough through the filter. I'm using 20 -50 by the way.
Is this something somebody else also experienced before?

Online bsa-bill

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Re: Smoking after installing return line oil filter
« Reply #1 on: 26.07. 2013 21:32 »
Quote
Also dripping oil from the engine carter.

Think you might have mistyped something there, would be helpful to know where the oil was dripping from

If you saw oil returning into the tank at presumably low revs and cold oil I think your filter should be fine provided you fitted an element recommended, I use the filter for a Citrion 2CV, these have little flow resistance you can easily blow through them.
other suggestion would be that you have the oil flow through the filter in the right direction, should be arrows on the filter head to show oil flow.

I've run a filter for many years now and oil flow is no problem, the capacity of filter elements are designed to pass oil flow from  bigger engines than our As (well 2CV apart) so it should be no problem
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 muskrat

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Re: Smoking after installing return line oil filter
« Reply #2 on: 26.07. 2013 22:04 »
Yep I agree with Bill, might be hooked up in reverse. Care must be taken where you route the hoses, don't want a split hose.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

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Re: Smoking after installing return line oil filter
« Reply #3 on: 26.07. 2013 22:38 »
Just had another thunk. If she wet sumped a bit and you topped the oil tank up I'd say it's come out the breather. And caused the smoke.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Offline isuzu

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Re: Smoking after installing return line oil filter
« Reply #4 on: 27.07. 2013 16:35 »
Thanks for answering guys. It was indeed spitting from the breather. During running the engine the sump fills up and causing the smoke. I did the conversion oke; no wrong connections. But I did away with it this morning and routed the old way without the filter system. Fresh sae30 oil in it and started. After some idling there was again coming smoke from the exhausts. Is there a possibility of filling the sump up with a running engine? Faulty oil pressure valve or something else?

Online Greybeard

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Re: Smoking after installing return line oil filter
« Reply #5 on: 27.07. 2013 23:25 »
Could the smoke be from surplus oil in the rocker box, getting sucked past the inlet valve guides? I'm wondering if the oil tank return after the rocker feed pipe connection has a blockage. This would be like putting a finger over the tank return pipe hole to force oil up the rocker feed pipe.

Offline wilko

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Re: Smoking after installing return line oil filter
« Reply #6 on: 28.07. 2013 00:53 »
Give the ball in your pickup tube a wiggle and giggle!

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Re: Smoking after installing return line oil filter
« Reply #7 on: 28.07. 2013 09:02 »
Another thunk. The rockerbox banjo bolts, are they original? If the hole in them is too big more oil will flow there rather than back to the tank. Resulting in the sump slowly filling.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Offline isuzu

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Re: Smoking after installing return line oil filter
« Reply #8 on: 30.07. 2013 11:55 »
Hi, The banjo bolts are the originals and I never had this problem before the oilfilter mod, so that is not the culprit. I was getting quite depressed last days about this problem but yesterday evening I pulled her again out of the garage. Started and idling wonderful and after 7 minutes smoke came again from the exhausts. This time I 've let her idling for about 20 minutes (lots of white smoke) and by that time the smoke got less. Reason I did this because of the suspicion of residue of oil in the exhaust (had the exhaust off earlier to see if the oil got into the silencing stuff; but nothing came out).
After that the machine is working like before and I even got a grin back on my face!

Still I'm wondering why the filter system (bought at norbsa) is not working as it should. It needs more pressure in the retour and nearly killed my engine.

Online chaterlea25

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Re: Smoking after installing return line oil filter
« Reply #9 on: 30.07. 2013 13:44 »
HI Isuzu,
I have fitted numerous filter units in the return lines of many different bikes
Never had a problem!!!
The oil must flow from the outside of the filter to the centre

Use a pressure oil can to pump oil in the correct direction through the filter and pipes to see if there is a blockage
A lot of fillters have anti drain valves under the circle of holes around the outer perimiter
these prevent oil flowing in the reverse direction
The car engines that the filters are designed for pump massive quantities of oil through the filter per minute
and do not build back pressure
The small pumps on our BSA's will not trouble them

HTH
John
1961 Super Rocket
1963 RGS (ongoing)

Offline isuzu

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Re: Smoking after installing return line oil filter
« Reply #10 on: 02.08. 2013 11:03 »
I did the conversion like you say. It was possible to blow through easy. Still the carter filled up. Wonder if my oil pump is just a bit too worn out?

Offline A10Boy

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Re: Smoking after installing return line oil filter
« Reply #11 on: 02.08. 2013 12:54 »
Please, just for me, what exactly is a Carter?  *conf*
Regards

Andy

1960 A10 - Black Golden Flash
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1974 Kawasaki Z1a
Yam XJR 1300

Offline isuzu

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Re: Smoking after installing return line oil filter
« Reply #12 on: 02.08. 2013 12:58 »
The part of engines where oil comes together, to be pumped up again ....

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Re: Smoking after installing return line oil filter
« Reply #13 on: 02.08. 2013 13:50 »
That would be sump I gather.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Offline A10Boy

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Re: Smoking after installing return line oil filter
« Reply #14 on: 02.08. 2013 20:57 »
The part of engines where oil comes together, to be pumped up again ....

Thanks, its 40 years since I trained as a mechanic, and I've never heard the Sump called a Carter! Must be a local thing I guess! Interesting.
Regards

Andy

1960 A10 - Black Golden Flash
Plus
1974 Kawasaki Z1a
Yam XJR 1300