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Can anyone tell me where the sump drain plug is located on a 1946 16h?
Is it the bolt that is in the lower frame cutout?
Sump plug 16h
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Blanking Plug
No, that is a grub screw to block an oilway drilling. It's the hexagon headed 1/4" BSP plug just to the left. You basically have a 1938 pattern engine, as used by the WD Big 4. If you can't find a manual, then this may help.
https://www.wdnorton.nl/Downloads/B4%20M&I%20manual%20200dpi%20by%20courtesy%20of.pdf
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Mine is a brass screw with a single slot for a screwdriver.
It is located just above the sump guard (If you have one) on the lower front right hand side of the crank case. (RHS)
I'd send a picture but it is wrapped up for Winter.
Neil.