F5B-9 Crankshaft Driven Raw Water Pump | Johnson Pump 10-24228-1 Crankshaft mounted engine cooling pump used on many small block V8 GM marine engines. Johnson Pump crankshaft style engine cooling pump F5B series pump Bronze pump housing with stainless steel shaft Flexible neoprene impeller Rubber lip seal 1 1/4 in. inlet and outlet ports Fits many Marine Power, Indmar, PCM, and Volvo Penta V8 small block engines Pump design allows easy impeller access Replacement impeller P/N 09-1027B-10 Replaces Johnson Pump 10-24076-2 Replaces Indmar 685011