Test Wheel - 378088

TEST WHEEL - PART NO. 378088

Earlier 40 h.p. test wheel. Johnson Service Bulletin #902 identifies this as the old-style wheel superseded by test wheel 378566.

For use with the 1962 Electramatic RK-series gearcase, the older wheel can be modified to provide clearance. Measure the flange depth at point A in Figure 2 and machine 1/8 inch (.1250 in.) from the measured depth. The bulletin also describes machining 1/8 inch from the bronze hub only, while retaining the original flange dimension.

Factory instructions: Johnson Service Bulletin #902 (May 28, 1962). Replacement wheel: 378566.