Service Tool 378566

Test Propeller
Part Number 378566

A: 1 13/16 in.
B: 1 5/8 in.
C: 7 in.
Splined Hub: No
Casting Identification: 378566
Used on: 40 HP (43.9 cu. in.)

These test propellers are precisely calibrated to provide just the right load on the engine during tank test. A must for determining if the engine is capable of reaching its rated RPM.

Propeller may be obsolete and not be available.
Information is for reference only.

Johnson Service Bulletin #902 (May 28, 1962) introduced this recessed-hub test wheel for the 1962 Electramatic RK-series 40 h.p. engines. It superseded test wheel 378088 and could also be used on earlier 40 h.p. engines.