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Sump plug with magnet

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recently bought a plug for the 68 Atlas . both the large thread and hexagon appear different to the Dommy ones .  AF ?   What spanner size?

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Hello Bob - HNY .  I don't think Norton ever fitted a magnetic sump plug but i stand to be corrected.  A 68 Atlas should be the same as a 68 Mercury for which I use the same open-ended spanner that I use to adjust the steering head bearings.  I'll measure it for you later.  Cheers, Howard

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Depends on what Hexagonal bar the manufacturer used to machine the plug from. Or they could have machined the hexagon itself onto round bar. The hexagon won't necessarily match what has gone before. Measure the AF dimension and get a spanner to suit.  

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Thats helpfull. I think what i should have asked is,  did the hex or thread change over the years?. I know the hex is different for the Commando . Just hope the thread stayed the same or i am boogered !.

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The Dommie hex is 1.5 inch - just measured it.  The thread type did stay the same on my 1969 750 Commanado but the hex was smaller.  Cheers, howard 

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This is for my sons bike, on my Dommy i was incensed to recieve a magnet plug that none of my tools would fit !.  The bench grinder  soon sorted out the hexagons to match the tools i have carried for 30 years.  The PR 650 i am building has metric studs and nuts holding the tank on . YUK !.

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A strong magnet stuck on the inside near the bottom of the oil tank will do a similar job to a sump plug with a magnet attached to it. An oil filter in the return system will also help keep the oil clean of rogue steel and iron particles. Bigger chunks of metal will most likely get caught in the sump plug filter..

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Hi Phil,  my tank must have half a dozen magnets in it ! . I used to find a furry coat of filings on the sump one for some years  after the motor was re-built . For many years now ,  nothing at all.  It could be that the bore and cam chain  have  done  running in ,or possibly the oils have also  improved immesurably . Dont think my very iffy  worn crank would have lasted this long with the old oils. Have you found another source for the 15/60 ? fully synth oil yet?.

 



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