Willys Overland Knight Registry
Willys Six Carburetor Notes
The Willys Six carburetor evolved from the same Tillotson designs used on the Whippet Four with one notible exception; the accelerator pump.
The accelerator pump is not easy to spot on the diagram from the Willys 98B manual, but is more evident on the diagram from the C131, C157 truck manual which was an identical motor.
A more easily obtainable general purpose replacement is the Marvel Schleber which is notable for its complete lack of markings except for the words MADE IN U.S.A.
Not all Marvel Schleber carburetors have an accelerator pump and unfortunately the example shown below has the plunger rod missing, however you can see the hole in the float chamber casting when looking at the birds eye view.
Tillotson W-2A Carb diagram from 1930 Willys 98B manual
Tillotson J-1A / J-1B Carb diagram from 1930 Willys C131, C157 Truck manual
Marvel Schleber Carb - Accelerator pump missing on this example.
MADE IN USA markings just visible on the float chamber (left)
Marvel Schleber Carb - Accelerator plunger pump hole is visible at lower center
Marvel Schleber Carb - More views
Carburetor fitted to 1933 Willys 690A