The BSA A7-A10 Forum
Technical (Descriptive Topic Titles - Stay on Topic) => A7 & A10 Engine => Topic started by: isuzu on 26.07. 2013 19:43
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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?
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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
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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
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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
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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?
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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.
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Give the ball in your pickup tube a wiggle and giggle!
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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
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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.
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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
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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?
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Please, just for me, what exactly is a Carter? *conf*
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The part of engines where oil comes together, to be pumped up again ....
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That would be sump I gather.
Cheers
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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.
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Thanks, its 40 years since I trained as a mechanic, and I've never heard the Sump called a Carter!
Maybe if you worked for DAF you would have heard the term
Dutch for sump
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a little offtopic all this, but le 'carter moteur' in French = sump.
more here > http://fr.wikipedia.org/wiki/Carter_%28m%C3%A9canique%29
Which mentions a J. Harrison Carter > http://www.historywebsite.co.uk/Museum/Transport/bicycles/Sunbeam.htm
"a prominent feature of all Sunbeam machines was J. Harrison Carter’s oil tight chain lubricator and gear cover. The casing contained a small oil bath which lubricated the chain to reduce wear"
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Well, in Holland we call sumps; carters. Thought it was an English word, but it seems else ....
I suggest Wet sumping is from now on Wet carting ..... *smile*
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Take off your sump plate and check the non return ball in the pick up tube isn't obstructed or stuck.
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Like Americans call a gear box a transmission.
Must be hard for those that have English as a 2nd language.
Cheers
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Must be hard for those that have English as a 2nd language.
Strange that we Brits should be so anti "Johnny Foreigner" when we are a mixture of so many races (conquerors ) and our language (English) is a miss mash of Latin (Romans) French (Plantagenet's) and lots of other Europeans (Saxons,Danes) not to mention the Celts, Picts .....
We should be able to understands just about anyone's speak - Oops forgot to put Oz in there somewhere
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Hi I would run the bike for some short rides 5 miles get bike hot allow to cool and run again this should clear any excess oil from the sump,some very interesting ans and local language here always interesting mate.
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According to a quick internet search, the dutch word for sump is "vergaarbak".
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So we need a well functioning anti-vergaarbaking valve? *smile*
Sorry for the slightly offtopic.
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I gave up smoking 2 weeks ago, no oiling problems here!
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So, Carter is actually the Portugese word for sump......... That explains my ignorance, I only know a few Portugese words, mainly - cerveja [Beer], batatas fritas [Potato Chips] and praia [Beach]. And now I can add the word for sump... *smiley4*
Obrigado meus companheiros.
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Well my A7 is running the old fashioned way and after work I do "rustieke tochtjes" through the polder for fun. I'm leaving the filter out.
I want to introduce another dutch technical term for this week, maybe combine it with a price which off course can be collected at my home.
The new word is "ventieldopje" .......
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ventieldopje
My Nieghbour is Dutch, so I could say I asked her - but she's on holiday
I could say I'm just clever - but suspect most of you would remember posts I made that would prove that wrong
so I'll fez up - Google translate = valvecap
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So, Carter is actually the Portugese word for sump.
I wonder if the English word 'catcher' has the same origin as 'carter'. It would seem to have the same meaning in this case.
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Americans say - oil pan !
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Get back on track please fellas.
Start a new thread in Off topic & Diverse for different names for parts.
It all sounds Double Dutch to me.
Cheers