The BSA A7-A10 Forum

Technical (topic titles must be descriptive) => A7 & A10 Engine => Topic started by: rio169 on 27.07. 2010 21:08

Title: swing arm models oil tank drain nut
Post by: rio169 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.
Title: Re: swing arm models oil tank drain nut
Post by: dpaddock 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
Title: Re: swing arm models oil tank drain nut
Post by: trevinoz 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.
Title: Re: swing arm models oil tank drain nut
Post by: bsa-bill on 28.07. 2010 08:36
A thin bit of felt to put between socket and tank is worthwhile - don't we all know
Title: Re: swing arm models oil tank drain nut
Post by: BrianS 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

Title: Re: swing arm models oil tank drain nut
Post by: RoyC on 15.06. 2018 10:16
I put some thread sealer on the drain nut.
Title: Re: swing arm models oil tank drain nut
Post by: Billybream 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.
Title: Re: swing arm models oil tank drain nut
Post by: morris 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
Title: Re: swing arm models oil tank drain nut
Post by: Peter in Aus 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
Title: Re: swing arm models oil tank drain nut
Post by: stanwhite 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.
Title: Re: swing arm models oil tank drain nut
Post by: RoyC 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.
Title: Re: swing arm models oil tank drain nut
Post by: Greybeard 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?
Title: Re: swing arm models oil tank drain nut
Post by: RoyC on 15.06. 2018 21:25
Where did you get the O ring?

I have a tray full, all sizes. 

https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2057872.m570.l1311.R1.TR12.TRC2.A0.H1.Xo+rings.TRS0&_nkw=o+rings&_sacat=0
Title: Re: swing arm models oil tank drain nut
Post by: Peter in Aus 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
Title: Re: swing arm models oil tank drain nut
Post by: BrianS 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*
Title: Re: swing arm models oil tank drain nut
Post by: BrianS on 20.06. 2018 21:21
A mate made mention of sucking the oil out of the tank which reminded me that, many moons ago, I had bought a "Pela 6000 oil extractor" for use on our Mazda Bongo. Saved scrawling around on the drive to get at the sump plug and then spilling oil all over the place.

Having dusted it off, it did a fine job of sucking every last drop of oil out of the tank - although it took a while.

I cut off the copper ring from the drain plug/filter and replaced it with a fairly chunky O ring out of my selection box, cleaned up the threads and fitted it and, Hey Presto - after refilling with oil, several hours later - no weep  *smile*

Thanks again!

Brian
Title: Re: swing arm models oil tank drain nut
Post by: RoyC on 20.06. 2018 21:33
I see that you have fitted an o ring on the nut. I also do this, it stopped my leak.  *smile*
Title: Re: swing arm models oil tank drain nut
Post by: BrianS on 20.06. 2018 22:04
Yes indeed Roy - I just neglected to say it in my message  *conf*

I have edited it now though  *smile*
Title: Re: swing arm models oil tank drain nut
Post by: Butch (cb) on 21.06. 2018 08:52
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.

Me too.
Title: Re: swing arm models oil tank drain nut
Post by: RogerSB on 21.06. 2018 09:50
That's not original  *pull hair out*    *rant*  *whistle*

(Edit):  *grins* Only joking.
Title: Re: swing arm models oil tank drain nut
Post by: Greybeard on 21.06. 2018 10:04
After my recent engine work, the only leak I have is from the oil tank bottom union. I cannot use 'o' rings as the engine pipes are connected to it and I would not trust an o ring to stay put.

This is not my bike but you can see it needs fibre washers.
Title: Re: swing arm models oil tank drain nut
Post by: RoyC on 21.06. 2018 10:20
Mmmm, that's a different set up to the later models.
How about a soft copper washer ?
Title: Re: swing arm models oil tank drain nut
Post by: RoyC on 21.06. 2018 10:23
That's not original  *pull hair out*    *rant*  *whistle*

It's not really visible when it's screwed in Roger.    *smile*
Title: Re: swing arm models oil tank drain nut
Post by: Greybeard on 21.06. 2018 10:30
Mmmm, that's a different set up to the later models.
How about a soft copper washer ?
Yes, that would work. I don't know why it's leaking, they are normally fine. I'm not quite ready to change the oil so I'm having to put up with a leak at the moment!!
Title: Re: swing arm models oil tank drain nut
Post by: RogerSB on 21.06. 2018 11:44
It's not really visible when it's screwed in Roger.    *smile*

See my edit  *grins*