The BSA A7-A10 Forum

Technical => A7 & A10 Engine => Topic started by: UncleD on 13.01. 2019 22:15

Title: Rocker oil feed
Post by: UncleD on 13.01. 2019 22:15
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.
Title: Re: Rocker oil feed
Post by: trevinoz on 13.01. 2019 22:18
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.
Title: Re: Rocker oil feed
Post by: Joolstacho on 13.01. 2019 23:38
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!)
Title: Re: Rocker oil feed
Post by: UncleD on 14.01. 2019 01:00
...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!

Title: Re: Rocker oil feed
Post by: berger on 14.01. 2019 01:41
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
 
Title: Re: Rocker oil feed
Post by: Klaus on 14.01. 2019 06:49
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
Title: Re: Rocker oil feed
Post by: UncleD on 14.01. 2019 07:59
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
Title: Re: Rocker oil feed
Post by: Swarfcut on 14.01. 2019 09:21
 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.
Title: Re: Rocker oil feed
Post by: muskrat on 14.01. 2019 12:17
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
Title: Re: Rocker oil feed
Post by: JulianS on 14.01. 2019 12:26
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.
Title: Re: Rocker oil feed
Post by: RogerSB on 14.01. 2019 14:51
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.
Title: Re: Rocker oil feed
Post by: chaterlea25 on 14.01. 2019 19:10
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
Title: Re: Rocker oil feed
Post by: UncleD on 14.01. 2019 19:56
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.👍
Title: Re: Rocker oil feed
Post by: bsa-bill on 14.01. 2019 20:48
Quote
(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???)
Title: Re: Rocker oil feed
Post by: Topdad on 15.01. 2019 15:15
Just to concur with Musky ,my A10 is fitted with a rubber pipe to rocker feed ,5 yrs no problems.
Title: Re: Rocker oil feed
Post by: ironhead on 18.02. 2019 01:15
If you use clear tubing instead of black rubber, it's easy to check oil flow.