A dishwashing appliance is provided herein. The dishwashing appliance may include a tub, a sump, a chamber pump, a vane, and a threaded engagement joint. The chamber pump housing may be mounted within at least a portion of sump. The chamber pump housing may define an inner wall surface. The vane may be positioned within the chamber pump housing. The vane may extend from an inner radial end to an outer radial end. The vane may define a foil profile. The threaded engagement joint may include a first radial thread profile and a second radial thread profile. The first radial thread profile may extend radially from the vane at the outer radial end. The second radial thread profile may be formed on the inner wall surface. The second radial thread profile may be complementary to the first radial thread profile.