On page 17 of the singles forum under crankcase assembly there are some excellent comments and photos regarding the aforementioned oil spacing ring. They are however contrary to the advice given in Mike Pembertons singles DVD. Basically, could anyone offer definitive advice as to to which way the castellations face on the oil spacing ring. Inwards towards the flywheel or outwards towards the sprocket. As mentioned, all the usual Norton literature, Franks, Garratt and maintenance/ instruction books offer nothing regards correct fitment. Thanks, Phil
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On the WDNorton web site,…
On the WDNorton web site, the following is written. I think this is the piece you are asking about:
Driving Side Main Bearing Distance Piece (4155) On early 16H and Big4 spare parts lists, this metal ring is not mentioned despite the fact that they are mounted in all engines after 1935. It is placed between the two main bearings at the drive side of the engine. It is a flat ring with an oil channel at the outer circumference and 4 recesses on one side. These recesses are to face the crankshaft when mounting the bearings in the drive side crankcase half. This position is taken from the Big 4 exploded engine view in the M&I manual, a schematic also used for civilian engines between 1938 and 1948. The 16H M&I manual exploded engine view does not show this part.
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https://www.nortonownersclub.org/node/949
this thread from September 2017 discusses your question with a couple of pictures. Looks like notches away from sprocket was found on a disassembled 19s. (Look at picture where case exterior is visible)
good luck