Post by Scoutpilot on Dec 29, 2014 9:30:36 GMT -5
There is some fog around this model. Some sources say it was introduced to the military in approximately June of 1943. Carter service Bulletins don't show it until August of 1948. This could indicate it was a transition carburetor from the MB/GPW to the M38, as the M38 appeared in 1949. But, it could have been available to military motor pools in limited areas of operation as early as 1943.
The last patent number of 12, all boxed in, is 2252958. It has the yellow/gold phosphate finish most commonly seen nowadays and sometimes poorly rendered. Like the 539S, it has no "Circled-C" logo on the air horn. But the Choke bracket assembly has a "Circled-C R" stamped on it. There is a marking under the bump on the bowl side of "O-614". The Bowl Cover has a marking of "146-94". The flange marking is one letter and one figure, e.g. L 8, while the flange stamp is "407". The marking on the lever assembly is a "Circled-C", a "Circled-R" and "Patent 2179380". The lever has three arms.
Click the photo for a larger view.
The last patent number of 12, all boxed in, is 2252958. It has the yellow/gold phosphate finish most commonly seen nowadays and sometimes poorly rendered. Like the 539S, it has no "Circled-C" logo on the air horn. But the Choke bracket assembly has a "Circled-C R" stamped on it. There is a marking under the bump on the bowl side of "O-614". The Bowl Cover has a marking of "146-94". The flange marking is one letter and one figure, e.g. L 8, while the flange stamp is "407". The marking on the lever assembly is a "Circled-C", a "Circled-R" and "Patent 2179380". The lever has three arms.
Click the photo for a larger view.
