my long term commando rebuild (10 rears!) is coming to an end and I've managed to loose the sump plug. I've ordered a new one but it does not fit.its the right size but a different thread.Does anybody now if there are different sump plugs available for the commando?
sump plug on my 71 is, I b…
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My recollection for norton…
My recollection for norton heavy twin is 1949 to about 1952 are 3/8 BSF toward the rear of the engine/sump.
1953-1971 had the screened sump filter only. it went from brass to steel and the hex size went from British to later imperial hex.
72-73 200000+(combat breather) 750 was front 3/8 UNC.
All 850 had both front drain 3/8 unc and on the rear they went back to the original style screen filter.
I own all these variants of NHT engine within 30 feet of where I now sit. Yours may be different but I would be surprised.
On a commando isn't the gearbox drain 3/8 BSF?
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sump plug on my 71 is, I believe, 3/8 16 tpi whitworth. There are much larger diameter ones that have the filter in them on some machines. I have seen plugs on that well known auction site that have a 3/8 bsf thread and mention commando. These of course would be 20 tpi and wouldn't fit. Maybe you have one of those.