Quote:
Originally Posted by Tony Smith
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Tony,
I found in the attached pages from the British War Department "Special Pattern Vehicles" Two types of spark plugs are specified. Champion J-9 and Champion H-10 both with different 0.025" and 0.030" gaps respectively.
It also appears that at some time the plug type was changed in the parts lists.
Both a 1940 parts list and a 1943 parts list show part No. 52-12405 C as the earlier part and 01T 12405 a later part to be supplied when 52-12405 C is depleted. 01T 12405 is also specified in the 1943 parts list as a Champion #H-9.
"J" plugs have a 3/8" reach with the 0.025" gap
"H" plugs have a 7/16" reach with the 0.030" gap
Not sure why but for some reason they changed the type of spark plug to be used.
Cheers,