11
A7 & A10 Engine / Re: SRM oil pump
« Last post by a101960 on 20.12. 2024 20:38 »Thank you all for your response. It has been very helpful
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12
Frame / Re: Petrol Tank woes
« Last post by sean on 20.12. 2024 19:44 »go to your local wine kit store they sell different size rubber stoppers for wine carboys and will have one that will fit in the filler hole
drill a suitable size hole to push a soccer ball air pump needles [ amazon] just use a bicycle pump you only need a small amount of air 1 or 2 psi ...put the tank in the laundry tub full of water and you will see the bubbles from the leak
regular white vinegar is what I use to eat the rust but it takes a week or so
if you have pin holes I would cut the weak part of the tank out and braze in a new piece , hopefully its on the bottom where it wont show .
lots of different methods to make brazing gas tanks safer due to fumes on u tube .
good luck
drill a suitable size hole to push a soccer ball air pump needles [ amazon] just use a bicycle pump you only need a small amount of air 1 or 2 psi ...put the tank in the laundry tub full of water and you will see the bubbles from the leak
regular white vinegar is what I use to eat the rust but it takes a week or so
if you have pin holes I would cut the weak part of the tank out and braze in a new piece , hopefully its on the bottom where it wont show .
lots of different methods to make brazing gas tanks safer due to fumes on u tube .
good luck
13
A7 & A10 Engine / Re: Sump plate studs
« Last post by limeyrob on 20.12. 2024 19:40 »I have a Matchless and the A10, both get run every week of two. The Matchless does wet sump but it only shows on the return (no bubbles) its not smoky. The A10 however will produce a solid could of smoke that goes 2 or 3 gardens down and lasts for ages. Considering how good a condition the engine is its beyond annoying. It has an oil filter on the return and I'm now wondering if that empties into the engine too. If its that I should see a rapid rise int eh first day or two then a much slower one. Its a bit cold just now but I'll check when the weather is nicer.
14
A7 & A10 Engine / Re: Sump plate studs
« Last post by Roger (Doomtrainbarx) on 20.12. 2024 18:56 »I have 3 bikes that all wet sump to various degrees - I just fire them all up every 2 -4 weeks and let the pump scavenge away the excess oil - seems the obvious thing to do.
15
Frame / MOVED: Alternator a10s
« Last post by Caretaker on 20.12. 2024 17:46 »This topic has been moved to Lucas, Ignition, Charging, Electrical.
https://www.a7a10.net/forum/index.php?topic=19359.0
https://www.a7a10.net/forum/index.php?topic=19359.0
16
Frame / Re: Petrol Tank woes
« Last post by chaterlea25 on 20.12. 2024 17:33 »Hi All,
Some words of warning about "Evaporust"
If a part of the object you are de rusting sits above the level of the liquid (in the air)
In spite of dunking all said part in the solution severe erosion of the object will happen at the line where liquid and air meet..
This happened to a part I was treating, I had left it part submerged for a day or two..
I would be fearful of letting a fuel tank part filled with evaporust sit for any length of time
Filling a four gallon tank with Evaporust would be fairly expensive
..
I have a vintage BSA flat tank to de rust very soon, once I remove the failed lining that's in side it. I have 2 containers of evaporust that should be enough to fill it completely
John
Some words of warning about "Evaporust"
If a part of the object you are de rusting sits above the level of the liquid (in the air)
In spite of dunking all said part in the solution severe erosion of the object will happen at the line where liquid and air meet..
This happened to a part I was treating, I had left it part submerged for a day or two..
I would be fearful of letting a fuel tank part filled with evaporust sit for any length of time
Filling a four gallon tank with Evaporust would be fairly expensive
..I have a vintage BSA flat tank to de rust very soon, once I remove the failed lining that's in side it. I have 2 containers of evaporust that should be enough to fill it completely
John
17
Frame / Re: Petrol Tank woes
« Last post by jhg1958 on 20.12. 2024 17:07 »Stupidly I decided to tackle relining my petrol tank before Christmas in the recent warm weather. The tank was not desperately rusty but I wanted to cure the leak. I had already drained and removed the tank and I has received two 5/8” BSP plugs for the tap holes and a rubber bung for the filler hole. If anyone needs a bung for the filling hole let me know as I have 2.
I taped up large parts of the paintwork so I would not spoil it. And poured one 1l of evapo-Rust into the tank, shaking and turning the tank so all surfaces were covered by the liquid. After 24 hours (as per instructions) I emptied the tank and looked inside. Not much of the rust had been removed. I should have realised the speed of chemical reactions, in this case rust removing, is proportionate to the temperature. It doubles with every 10C. Although it was a warm winters day it was only 11C in my unheated garage. In summer you should expect 20C so this may take a little longer. One more day of turning and shaking. This time the solution came out black suggesting it had done all it could.
I washed out the tank with boiled water as boiled water has less dissolved oxygen that causes flash corrosion. As I shook the tank with hot water it began to pressurise. Now I found out where the leak in the tank was. It was around a repair at the back of the tank. It was by an old brazed repair and was not there before I had the tank painted. I suspect it was caused by the tank rubbing on the frame. I have 2 rubber mats on the frame but rear one had compress letting the tank touch the frame.
Finally I rinsed it out with meths and dried with a hair drier for about 2 hours.
Today the temperature has dropped and too cold to work so I decided to preserve the tank and leave the job until spring. I put about a pint of oil and paraffin gave it a good shake to cover all the surfaces and sealed it up.
John
I taped up large parts of the paintwork so I would not spoil it. And poured one 1l of evapo-Rust into the tank, shaking and turning the tank so all surfaces were covered by the liquid. After 24 hours (as per instructions) I emptied the tank and looked inside. Not much of the rust had been removed. I should have realised the speed of chemical reactions, in this case rust removing, is proportionate to the temperature. It doubles with every 10C. Although it was a warm winters day it was only 11C in my unheated garage. In summer you should expect 20C so this may take a little longer. One more day of turning and shaking. This time the solution came out black suggesting it had done all it could.
I washed out the tank with boiled water as boiled water has less dissolved oxygen that causes flash corrosion. As I shook the tank with hot water it began to pressurise. Now I found out where the leak in the tank was. It was around a repair at the back of the tank. It was by an old brazed repair and was not there before I had the tank painted. I suspect it was caused by the tank rubbing on the frame. I have 2 rubber mats on the frame but rear one had compress letting the tank touch the frame.
Finally I rinsed it out with meths and dried with a hair drier for about 2 hours.
Today the temperature has dropped and too cold to work so I decided to preserve the tank and leave the job until spring. I put about a pint of oil and paraffin gave it a good shake to cover all the surfaces and sealed it up.
John
18
Lucas, Ignition, Charging, Electrical / Re: Alternator a10s
« Last post by Nomad54 on 20.12. 2024 16:55 »Hi Chris
Thanks for the reply. I inherited the bike after a cousin passed away. Luckily it was still in one piece but attached to a Watsonian side car which was immediately discarded. You were saying that you were thinking about extending the crank to allow for an alternator. Don't think that would work as it is a different crank fitted to these bikes.
Cheers lonely Tom
Thanks for the reply. I inherited the bike after a cousin passed away. Luckily it was still in one piece but attached to a Watsonian side car which was immediately discarded. You were saying that you were thinking about extending the crank to allow for an alternator. Don't think that would work as it is a different crank fitted to these bikes.
Cheers lonely Tom
19
A7 & A10 Engine / Re: BSA Goldflash Dynamo Sprocket
« Last post by limeyrob on 20.12. 2024 16:13 »What I don't get about these cork washers is that I'll bet just about every engine is 5/32. So why make 1/16, 1/8 and even up to about 1/4? There's no way BSA would make parts that varied so much. I must have a pile of these about 2"" high. all too thick or too thin.
20
A7 & A10 Engine / Re: Sump plate studs
« Last post by groily on 20.12. 2024 15:50 »Depends how often you run it I guess Rob, but I wouldn't bother draining for 1/4 pint, or 1/2 for that matter. Just don't top up until it's run for a bit!
Before I split my cases and replaced said bits while sorting out the drive side shimming on my A, it would sometimes have at least that in there, but it pumped it back pretty quickly if run at a fast tickover for a few. My B never let a drop through, nor used a drop between oil changes, even better.
Replacement of the ball and spring on the A did the job in my case
and it never leaked afterwards. A far cry from several other less continent machines round here, but as I suffer from the delusion that the Perfect is the Enemy of the Good, I'm not averse to taps (big bore ones mind) and mag cut-outs on them.
Before I split my cases and replaced said bits while sorting out the drive side shimming on my A, it would sometimes have at least that in there, but it pumped it back pretty quickly if run at a fast tickover for a few. My B never let a drop through, nor used a drop between oil changes, even better.
Replacement of the ball and spring on the A did the job in my case
and it never leaked afterwards. A far cry from several other less continent machines round here, but as I suffer from the delusion that the Perfect is the Enemy of the Good, I'm not averse to taps (big bore ones mind) and mag cut-outs on them.