ours actually has a bolt blanking this hole off but un screwwing it from time to time allows any fluid to drip out.

try clicking this video of the engine first time start

VID_20150404_132750722 by Robert & Ali Davies, on Flickr


Morgans 1934 MX, 1947 Series 1, 1956 +4 TR4, 2000 +4 T16
Triumph Herald 1969 13/60
Morris 1970