[Healeys] BN1 Sump Plug Thread type and size.

[STEPHEN CUSS]

Hello everyone, can someone help me with the size and thread type for a BN1
1954 Healey sump plug, I have looked in both the workshop manual and parts
list but cannot find the details i want to order a magentic sump plug from a
local UK store but need to give them the details. I have a standard sump
(original fitted) but as the car is running I cannot take out the existing
plug, without needing to darin the oil.
 
Thanks in advance for any help with
this matter.
 
Regards
 
Stephen