Fuel Tank Filler Cap (Cap Assembly) - how many types ?

It appears that the numbers 4b5389, and 4b1451 are individual part numbers , with 4b5441, and 4b1455 being the numbers for the complete cap assembly. These two types are not the only styles cat made, and at times the caps were also produced in both iron or brass, depending on what was available.

It appears that the numbers 4b5389, and 4b1451 are individual part numbers , with 4b5441, and 4b1455 being the numbers for the complete cap assembly. These two types are not the only styles cat made, and at times the caps were also produced in both iron or brass, depending on what was available.

I always understood the Iron caps were War time manufacture saving the aluminum for more important use.

Hi,
Each of my four wartime cats (1940/41) have the aluminium fuel caps, so presumably they changed to Iron after that, but of course, for the US, the war started later than 1940 after Pearl Harbour.

I don't think I've ever seen an iron fuel filler cap.

My 1954 D2 seat tank has the large aluminium fuel cap.

Kevin

Actually I "think" my 1944 D2 has an iron cap.
I'll look next week as it is over to a friends farm.

[quote="drujinin"]Actually I "think" my 1944 D2 has an iron cap.
I'll look next week as it is over to a friends farm.[/quote]
Just out of curiosity, could you make a note of the part number of the iron filler cap, I wonder if it will be the same as the aluminium ones.

I have one iron cap, 4A60. it is one of the tall style caps

The two 4B caps mentioned were both introduced in 1937. The cast iron 4A60 cap was released in 1942. It was phased out in 1944, with 4B1451 to be used instead. It looks like the material properties for the 4B caps were changed over the years, but without doing some more digging, I can't tell what those changes were.

Dave