Author Topic: swing arm models oil tank drain nut  (Read 1340 times)

Offline rio169

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swing arm models oil tank drain nut
« on: 27.07. 2010 21:08 »
Could somebody tell me the correct size spanner/socket for removing the drain plug on the oil tank. I am thinking around 1 5/16" or 13/16 BSW / 15/16 BSF. I need to buy one as the largest socket i have is 32mm. Many thanks out there.

Offline dpaddock

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Re: swing arm models oil tank drain nut
« Reply #1 on: 28.07. 2010 02:23 »
Yes, 1-5/16 inch; same size as the fork top nut, so get a 6-point socket so you can do those up tight.

David
David
'57 Spitfire


Online trevinoz

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Re: swing arm models oil tank drain nut
« Reply #2 on: 28.07. 2010 07:16 »
The socket required is 3/4 Whit.
As these nuts are very thin, you may have to machine the socket back a bit to reduce the lead to get a decent engagement on the flats.
3/4 WW is about 1.300 AF so an 1 5/16 AF socket is very close.
Trev.

Online bsa-bill

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Re: swing arm models oil tank drain nut
« Reply #3 on: 28.07. 2010 08:36 »
A thin bit of felt to put between socket and tank is worthwhile - don't we all know
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline BrianS

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Re: swing arm models oil tank drain nut
« Reply #4 on: 15.06. 2018 10:08 »
Sorry to resurrect an old thread but the subject is exactly right for my question  *smile*

I don't do a great mileage on my A10 so have only just done the second oil change since I took ownership.

All seemed to go well and I am using Morris's Golden Film SAE40 oil to save disturbing any debris in the sludge traps.

However, I would welcome advice on the drain nut which, despite tightening as much as I dare, is slowly weeping oil.

I have a copper washer on my drain nut and was expecting to be able to take it off to anneal but it seems shrunk on and I couldn't remove it without damaging it. I have nothing that size in my copper/fibre washers box!

Would loosening and re-tightening the nut possibly cure it?

If not, what possible remedies do I have please?

Brian

1955 BSA A10 Golden Flash
Exeter, Devon, UK

Offline RoyC

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Re: swing arm models oil tank drain nut
« Reply #5 on: 15.06. 2018 10:16 »
I put some thread sealer on the drain nut.
My bike is a 1958 A7SS
Staffordshire UK

Online Billybream

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Re: swing arm models oil tank drain nut
« Reply #6 on: 15.06. 2018 10:59 »
SRM sell clear high modulas silicon sealant which I ordered when I last brought some spares from them.
It's very similar to bathroom sealant you get from a DIY store but it's great to use on gaskets and threads.
You may well obtain it from a store local to you and it's so useful.
1960 Super Rocket, owned since 1966, back on the road 2012 after being laid up for 29yrs.

Online morris

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Re: swing arm models oil tank drain nut
« Reply #7 on: 15.06. 2018 11:44 »
From memory I think it's a 27 or 28 mm diameter.
Your local plumber store should have them
'58 BSA A 10 SA
'52 BSA A 10 Plunger
'55 MORRIS ISIS
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Offline Peter in Aus

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Re: swing arm models oil tank drain nut
« Reply #8 on: 15.06. 2018 11:50 »
Use a "O" ring (put the gasket in the bin) and don't do it up to tight just a bit more than hand tight. no leaks all good ;)
Peter

Busselton West Australia
49 A7 longstroke
58 A10  SA

Offline stanwhite

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Re: swing arm models oil tank drain nut
« Reply #9 on: 15.06. 2018 17:20 »
When I first got my bike, (last March), I had a lot of oil leaks. Including the crankcase drain. The previous owner had used fibre washers, and they did not look great.

 I only had fibre washers, so that's what got fitted. They don't leak... Where I didn't have the right size fibre washer, (hole too small), I very carefully made it bigger.

Good luck,

 Stan.

Offline RoyC

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Re: swing arm models oil tank drain nut
« Reply #10 on: 15.06. 2018 19:51 »
Use a "O" ring (put the gasket in the bin) and don't do it up to tight just a bit more than hand tight. no leaks all good ;)
Peter

Same here.
My bike is a 1958 A7SS
Staffordshire UK

Online Greybeard

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Re: swing arm models oil tank drain nut
« Reply #11 on: 15.06. 2018 19:53 »
Use a "O" ring (put the gasket in the bin) and don't do it up to tight just a bit more than hand tight. no leaks all good ;)
Peter

Same here.
Where did you get the O ring?

Offline RoyC

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My bike is a 1958 A7SS
Staffordshire UK

Offline Peter in Aus

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Re: swing arm models oil tank drain nut
« Reply #13 on: 15.06. 2018 23:39 »


[/quote]
Where did you get the O ring?

From any bearing supply shop will have a selection of "O" rings.
Peter

Busselton West Australia
49 A7 longstroke
58 A10  SA

Offline BrianS

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Re: swing arm models oil tank drain nut
« Reply #14 on: 16.06. 2018 11:05 »
Thanks guys - a good range of options!
Having just done an oil change, I guess it's petrol tank off and lay it over to fix the leak   *eek*
1955 BSA A10 Golden Flash
Exeter, Devon, UK