The BSA A7-A10 Forum
Technical (Descriptive Topic Titles - Stay on Topic) => A7 & A10 Engine => Topic started by: UncleD on 13.01. 2019 22:15
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1958 SuperRocket.
I broke my rocker oil feed pipe about 10mm up from the banjo at the oil tank. As far as I can tell this part number is 42-0139. Can anyone confirm this as I can't see it in the parts list.
Also, with the Eddie Dow type fittings at the top, is a flexible rubber tube used all the way to the tank or does it have some metal tube also? Is there any functional problem with having all rubber tube as opposed to the metal pipe? I currently have the standard set up but wonder if the latter was less prone to cracking /vibration.
Cheers.
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Unc,
The late models had a short piece of rubber tube a few inches above the banjo to isolate the vibes.
An easy repair, silver solder a short piece of 3/16" tube into the banjo, cut back the long end and insert the rubber.
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Just watch out for the different outlet hole sizes on the hollow bolts.
Rear inlet is smaller I think, so that oil gets to the exhaust spindle.
(Or am I talking out of my posterior!)
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...different outlet hole sizes on the hollow bolts. Rear inlet is smaller I think...
Can someone confirm this? (I could just check but don't want to bugger up my dowry washers) I have never paid attention to ensuring which bolt goes in which hole!
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the bolt holes should be the same size , same part number--- can't remember the size off hand but do remember opening mine up by 1/64th inch when I was young and dafter than I am now., but if you have a very large bolt hole that bolt is for the drain pipe on B series engines , mmmmm the holes may be 1/32nd inch----- I think the outlet hole into the rockers is the same as well or surely it would be a different part number--- mmmmmmm again they are a different bolt from years 54 to 63 , I bet someone will have the information somewhere but inlet and exhaust banjo bolts still have the same part number as each other
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Both holes are the small ones. The bolds with the bigger holes are for the oilreturn from head at the singels like B31 and so on.
cheers Klaus
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Can anyone confirm the part number for the oil tank banjo? I have seen both 67-8309 and 42-0139.
To add to the confusion, my broken one doesn't look like pictures I have seen on the net as it has a step on the inside wall whereas others I have seen are flat.
Cheers
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G'Day UncleD
Part 67 8307 is the banjo feed pipe from the oil tank on a plunger framed machine. Part 42 0139 looks more like the correct part, but I cannot confirm as my parts book only goes to 1957, and lists 42-48 as "Rocker Oil Feed Pipe Complete" Later pipes are in two parts, joined by a rubber sleeve.
At the end of the day these banjo fittings were simply standard components, you should be able to source or adapt easily. The piece you have with a step on the inside looks as if the previous owner has tried this already.
Swarfy.
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G'day uncD
I have rubber hose all the way from the tank banjo to the Y at the rockerbox. There is bugger all pressure in that line.
Cheers
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The Gold Star used a rocker oil feed bolt with a larger hole on the exhaust. Some riders fit one to the A10 exhaust.
I have tried both and did not see any difference.
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Hope this helps UncleD.
The holes in the banjo bolts 65-0317 on my 1960 A10GF are both the same size. I also believe some models had a bigger hole on the exhaust side (edit:) as JulianS mentioned (end edit:) (maybe Gold Star??), I'm sure someone will know.
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Hi D,
The banjo in your photo is correct with large and smaller diameters so it sits concentric with the outlet pipe
The larger side sits over a shoulder that also holds a fibre washer
Memory tells me both oil bolts have 3/64in. holes for the A10
The goldie has two different but larger metering holes
The B31 drain bolts have the holes about 3/16in.
John
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Brilliant information & photos.
The 1958 parts list does not show the separate lower banjo (as I assume it had continuous metal pipe) as was fitted to later models and apparently mine by the previous owner.
As you may know 1958 was the first of the Super Rockets and shared many parts share with previous models and then with owner repairs usually being from later models, this makes identifying what I've got and what I need a bit more complicated than going to the 58 parts book!
Thanks all..parts on the way.👍
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(Or am I talking out of my posterior!)
don't know for sure ( and I should know being good at it).
But I think both holes should be the same, the hollow bolts with a larger hole were for a different model (again I thnik - Goldie???)
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Just to concur with Musky ,my A10 is fitted with a rubber pipe to rocker feed ,5 yrs no problems.
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If you use clear tubing instead of black rubber, it's easy to check oil flow.
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Hello, can someone please confirm which way I should be fitting my short section rocker oil feed banjo 42-0139 onto the oil tank on the 1958 GF. The banjo has different diameters on either side - do I fit the smaller diameter against the oil tank and the larger diameter against the stepped nut or vice versa?
Any comments much appreciated.
Many thanks.
Peter
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Hi Peter,
Bigger side to the oil tank
John
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I was told a long time ago to occasionally put a finger over the return in the tank to send more oil to the rockers.. maybe a load of xxxx but i have always done this (before the oil gets too hot) mind I have only had the bike for 52 years so still on a learning curve!!!
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i used to put my finger over many holes back in the day ;) but now my bezaaaa has a bit of clear plastic tube and i see it going up---- i do honest ;) , but i do miss getting my finger sticky *lol* now where's my black&tan *beer*
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Just a quick question. I'm sorting the connections for the new maggie cut out oil switch, and thought I'd try to locate the weeping oil from somewhere around the tank connections. On the return side banjo, I have an annealed copper washer next to the tank, and a fibre washer behind the nut that holds it all on. When I screw on the return oil pipe, there doesn't seem to be any room left when it's tightened, and I'm wondering if it's bottoming out on the large banjo nut. Once tightened, the oil pipe spigot doesn't move, but is the setup correct?
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Hi, see information supplied by Andrew ar Priory Magnetos
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Cheers Billy (and Andrew).
There was a copper washer next to the tank which I thought was standard. I'll change it for a fibre item (which should be a little thinner) and see if that makes a difference.
*good3*
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I've managed to solve all my leaks, at least for now *roll*
I used fibre washers as per the diagram. Just be aware Worty that not all fibre washers are created equal in thickness and fortitude it seems.
Try to find some good old school thick ones, I'm sure they are better.
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Very true BoN. I bought a selection from Ebay which were tripe - broke up under moderate pressure *ex* *angry* *razz* *problem* *pull hair out* *beer*
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I've managed to solve all my leaks, at least for now *roll*
I used fibre washers as per the diagram. Just be aware Worty that not all fibre washers are created equal in thickness and fortitude it seems.
Try to find some good old school thick ones, I'm sure they are better.
Correct, the fibre washers sold by MCA are generally very good and just like the originals. With them being thick, it is necessary to tighten and retighten periodically, particularly the notorious rocker banjos.
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Am I right in saying MCA only supply trade these days? If so, who is a reliable supplier?
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Just chose your most convenient bricks and mortar bike shop. The likes of MCA, Wassell etc will sell to them no problem. Standard bearings, oil seals and other engineering sundries, like fibre washers can be sourced from a local bearing supplier, or if they insist on account holders only, via any established retail enterprise such as your local back street garage.
If price is your consideration, online will be far cheaper, but the uncertainty of quality may make it worth paying a little extra for stuff you can see and handle before parting with your cash.
Swarfy
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I've swapped many of the fibre washers for annealed aluminium ones. They are a single use (although with care you can re anneal them) but they are brilliant at sealing problem unions. My 58 Rocket has a top end feed exactly as the 58 Parts book which is given the parts no. 42-48 (or as Feked has it 42-0048 two banjos a tee section and a long steel pipe with a short rubber join near the oil tank return. Probably all been said already but that's forums for you.
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As per above posts I was convinced I had solved all my RB oil leak issues...A year later and for the last few runs I've had an ever worsening recurrence of the dread Oil Leak *sad2*
Thing is only on the left side of the head in particular filling up the counter bore for the head bolt immediately below the banjo and the RB gasket looked good all around the joint. Checked the easy and the obvious first before giving in and stripping it all down again and Lo! The banjo bolt on the exhaust rocker feed was loose and I mean not even finger tight *eek*
Needless to say everything has been nipped up once again but I'm thinking these fibre washers are a dead loss and I might try Slymo's idea of Aluminium ones if this happens again (and it probably will)...