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Commando Spanners

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Commando Spanners

Posted by trevor_cook at July 09. 2018

I've just recently bought a 1977 Norton Commando. Can I ask some pretty obvious questions.

I haven't got a box spanner that fits either the strainer in the engine oil tank, or one that fits the strainer in the crankcase. Measuring across the flats, I think that the size of the strainer in the oil tank is 1-1/8" AF and the strainer in the crankcase is 1-1/2" AF. Are these correct. I can't find a Whitworth size that matches and have assumed that they will not be metric.

I have now been out on it a couple of times. It seems to run well. It sometimes "pops" on the over run. Is this normal? I don't want to try and fix a problem that doesn't exist.

If not I think that I'll take it for a few more runs as I don't think that it has been out much over the last two years or so.

Re: Commando Spanners

Posted by Julian Wells at July 09. 2018

You might consider this:

https://andover-norton.co.uk/en/shop-details/16995/magnetic-crankcase-sump-filter-kit

Either way, I'd consider getting good quality sockets for these important items; Metrinch sockets and spanners are highly desirable for a Commando-oriented workshop.

Re: Commando Spanners

Posted by Andrew Heathwood at July 10. 2018

Trevor

Agree with Julian on the magnetic sump plug with smaller drain plug.  Also Andover Norton have a spanner to fit the sump plug (Part No. 13.1733).

From what I can find the sump plug is indeed 1-1/2 AF.

The oil strainer bolt looks to take a 5/8 Whitworth spanner but a 1-1/8 AF socket is a close (slightly loose) fit.

I've found this site very helpful http://www.baconsdozen.co.uk/tools/conversion%20charts.htm

As you can see from the charts 5/8W measures 27.94mm across (spanner size) whereas 1-1/8AF measures 28.57mm - so a close(ish) match.

Concerning the "pops" on the over run - I'd start by checking for air leaks - loose carb or exhaust connections.  As you say a few more runs and also check the spark plugs for running too lean a mixture.

Andy

Re: Commando Spanners

Posted by trevor_cook at July 10. 2018

Previously Julian Wells wrote:

You might consider this:

https://andover-norton.co.uk/en/shop-details/16995/magnetic-crankcase-sump-filter-kit

Either way, I'd consider getting good quality sockets for these important items; Metrinch sockets and spanners are highly desirable for a Commando-oriented workshop.

Thank you very much

Re: Commando Spanners

Posted by ian_soady at July 11. 2018

Yes, 1.5" AF for the sump plug. Be careful when replacing this as it's a fine thread and easy to cross thread especially if you're lying underneath the bike. Don't ask me how I know........

Re: Commando Spanners

Posted by francis_vidril at July 11. 2018

Previously trevor_cook wrote:

I've just recently bought a 1977 Norton Commando. Can I ask some pretty obvious questions.

I haven't got a box spanner that fits either the strainer in the engine oil tank, or one that fits the strainer in the crankcase. Measuring across the flats, I think that the size of the strainer in the oil tank is 1-1/8" AF and the strainer in the crankcase is 1-1/2" AF. Are these correct. I can't find a Whitworth size that matches and have assumed that they will not be metric.

I have now been out on it a couple of times. It seems to run well. It sometimes "pops" on the over run. Is this normal? I don't want to try and fix a problem that doesn't exist.

If not I think that I'll take it for a few more runs as I don't think that it has been out much over the last two years or so.

 

 

https://andover-norton.co.uk/en/shop-details/17199

Re: Commando Spanners

Posted by christopher_winsby at July 12. 2018

Previously trevor_cook wrote:

I've just recently bought a 1977 Norton Commando. Can I ask some pretty obvious questions.

I haven't got a box spanner that fits either the strainer in the engine oil tank, or one that fits the strainer in the crankcase. Measuring across the flats, I think that the size of the strainer in the oil tank is 1-1/8" AF and the strainer in the crankcase is 1-1/2" AF. Are these correct. I can't find a Whitworth size that matches and have assumed that they will not be metric.

I have now been out on it a couple of times. It seems to run well. It sometimes "pops" on the over run. Is this normal? I don't want to try and fix a problem that doesn't exist.

If not I think that I'll take it for a few more runs as I don't think that it has been out much over the last two years or so.

Get a cheap Vernier caliper yoiu can get digital ones cheap now which are good enough for most jobs at home. measure  nut and bolt heads as needed then you can use the metric equivilant. I use a 38mm socket for the sump strainer plug. In you look on line you can get them for a fraction of ther cost. I have found that the Metric equivilant is often at better fit than A/f spanners. I do have a full range of tools collected over years of working however and have found fit is down to the individual tool.

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