Oil pump identification

[A10 JWO]

I have an early 1954 A10 swinging arm ( engine 0970 ) I want to change the oil pump for the normal reasons, cannot afford SRM so I am going for an exchange unit from UK BSA spares people. They want the old pump up front and will send out a recon unit. I was going to buy an old one from a jumble and send it in lieu of mine as I don't want the bike off the road.
1/  Are all swinging arm pumps the same.
2/  Did the plunger pump also fit.
3/  Any special tools required,
Any normal good advice would be nice. Enjoy the sunshine.
Colin

[muskrat]

G'day Colin, I'm not 100% sure of the long strokes but the A7/10 pumps are same. The only difference is the later ones with the tacho drive, but they will fit as well.
Cheers

[Greybeard]

I have an early 1954 A10 swinging arm ( engine 0970 ) I want to change the oil pump for the normal reasons, cannot afford SRM...

I needed a new pump for my 55GF. SRM was rather expensive so I bought a high capacity steel pump from John (Bantam) Phelan for about half the price of SRM's one. The pump is slightly bigger than the original so I had to file away a small amount of metal from the inner timing cover. The pump works well; at least for the 100 miles I've done since completion!

[trevinoz]

All pumps are the same bodywise but the gear form changed somewhere along the line. I suspect after about 1956.

Trev.

[A10 JWO]

Neil did the pump sort out your wet sumping, any contact details for Bantam John.

Cheers Colin

[Greybeard]

Neil did the pump sort out your wet sumping, any contact details for Bantam John.

Cheers Colin

Wet sumping was not my problem; my pump was gummed up after being unused for 38 years. I stupidly stripped it without marking the gear meshing and when I reassembled it it would not revolve nicely. Also the Mazak material the pump is made of was looking tired.

John Phelan does not have a web site.
His address is:
18 Bowshaw
Dronfield
Sheffield
S18 6GB
Tel/Fax: 01246 290021

Worth a visit: like a motorbike shop in the 1960's!

[bsa-bill]

I did that with both my bikes (think I'd learn eh) I tried a few combinations and picked the least tight one put the pump together and both have worked fine since despite being tight to turn by hand.
I could be wrong but I suspect the manufacturer of these piumps ( did BSA make them or buy them) would not have spent a lot of time matching gears to gears to pump body, probably just built up spun round to bed in until they were free, flushed through and used.

I would not worry about fitting a pump that was tight to turn by hand, it will be running in oil, will bed in just fine ( much maligned soft metal body remember) and provided you change the oil soon after fitting (as you do) it'l be good.

Now shoot me down fella's, I like to buck the trend now and then

[Greybeard]

...my pump was gummed up after being unused for 38 years. I stupidly stripped it without marking the gear meshing and when I reassembled it it would not revolve nicely. Also the Mazak material the pump is made of was looking tired.

I also suspected that while removing the pump, which was ceased with gunge and required leverage while rotating the crankshaft I may have distorted the body.

[Greybeard]

Neil did the pump sort out your wet sumping, any contact details for Bantam John.

Cheers Colin

Wet sumping was not my problem; my pump was gummed up after being unused for 38 years. I stupidly stripped it without marking the gear meshing and when I reassembled it it would not revolve nicely. Also the Mazak material the pump is made of was looking tired.

John Phelan does not have a web site.
His address is:
18 Bowshaw
Dronfield
Sheffield
S18 6GB
Tel/Fax: 01246 290021

Worth a visit: like a motorbike shop in the 1960's!

John Phelans pump has a tacho drive slot.