Crank Driven Raw Water Pump Crank Driven | Volvo 21427730 Volvo Raw Water Pump Crank Driven | 21427730 OEM crankshaft mounted sea water pump with serpentine pulley fits various Volvo Penta GM 7.4L & 8.2L marine engines. Volvo Penta sea water pump Crankshaft driven pump 1 1/4 in. inlet and outlet ports Bronze raw water pump with serpentine pulley 6 1/2 in. diameter pulley with 2 1/4 in. and 4 3/4 in. male pilot Fits Volvo Penta 7.4GiPEFS, 7.4GSiPEFS, and 8.2GSiPEFS model engines Replacement impeller P/N 21951348 Replaces Volvo 3857203, 3862483, 3812694 Original Volvo Penta