Impeller Kit w/Gaskets

The Sherwood 10615K is a complete flexible impeller service kit for a wide range of Sherwood engine-driven raw-water pumps. Its 12-blade neoprene impeller uses a 5/8-inch keyed hub with a 3/16-inch keyway and is designed to restore reliable seawater circulation through marine engine cooling systems. The kit includes the impeller, required gasket, O-ring and Sherwood service instructions.

Key Features

• Sherwood manufacturer part number: 10615K
• Distributor SKU: 762-10615K
• Neoprene flexible impeller
• 12 flexible blades
• Outside diameter: 2-9/16 inches / approximately 65 mm
• Width: 1-5/8 inches / approximately 41 mm
• Shaft diameter: 5/8 inch
• Drive connection: 3/16-inch keyway
• Maximum published neoprene operating temperature: 130F
• Includes impeller, gasket, O-ring and technical service guide
• UPC: 734943104272

Pump Compatibility

Confirmed Sherwood pump applications include:

• M71
• G1010
• G1012
• L10B
• G45-1
• G1009
• R102
• P1014
• P110
• G3
• G4
• G26
• G55-2
• RPBC
• F95

Sherwoods current pump information directly identifies 10615K as the impeller kit for the M71 pump.

Engine Compatibility

Documented engine and marine-generator associations include selected:

• Chris-Craft 307, 327Q and 454 applications
• Chrysler 318 and 360 applications
• Cummins 4BT and 6BT marine diesels
• Onan MDK and MDL-series generators
• Perkins 6-354 marine diesels
• Pleasurecraft and PCM gasoline inboards
• Crusader gasoline inboards
• Westerbeke four- and six-cylinder diesel applications

Exact compatibility depends on the installed pump model, shaft configuration and engine cooling-system assembly.

Fitment Notice

Do not select this impeller by engine brand or displacement alone. Confirm that the installed pump requires:

• Sherwood 10615K
• 2-9/16-inch outside diameter
• 1-5/8-inch width
• Twelve flexible blades
• 5/8-inch shaft
• 3/16-inch keyed drive

This is a keyed-shaft impeller and should not be confused with similarly sized splined-hub impellers.

When This Part Needs Replacement

Replace the impeller when:

• Raw-water flow becomes weak or intermittent
• Engine temperature begins rising above normal
• Cooling-system or exhaust-temperature alarms activate
• The blades are cracked, torn, stiff or permanently bent
• Pieces are missing from the impeller
• The keyed hub shows wear or begins slipping
• The pump has operated without an adequate water supply
• The pump has ingested sand, silt or debris
• The scheduled cooling-system service interval has been reached

A worn impeller may continue rotating while delivering substantially reduced cooling-water flow.

Installation Notes

Before installation:

• Shut down the engine and isolate the starting system
• Close the raw-water seacock
• Remove the pump cover and existing sealing components
• Note the direction of the old impeller blades
• Recover all broken blade fragments from the pump and downstream cooling circuit
• Inspect the cover plate, cam, housing, shaft and key
• Lubricate the new impeller with glycerine, soapy water or an approved rubber-safe lubricant
• Align the 3/16-inch drive key carefully
• Install the supplied gasket and O-ring
• Reassemble the pump according to the Sherwood service guide
• Reopen the seacock and confirm strong cooling-water flow before operating under load

Never operate a flexible impeller pump dry.

Alternate / Cross-Reference Part Numbers

• Sherwood: 10615K
• Distributor SKU: 762-10615K
• Sherwood impeller-only reference: 10615
• Sherwood alternate format: 10615K-SHW
• Earlier Sherwood references: 19355, 21182 and 22013
• Crusader: RP061017
• Pleasurecraft: RP061017
• Westerbeke: 33779
• Sierra: 18-3047
• Sierra: 18-3061
• Sierra distributor references: 51-0082 and 51-0083
• Oberdorfer: 8922
• UPC: 734943104272

Parts Desk Insight

The critical identifiers are the 5/8-inch keyed shaft, 3/16-inch keyway and 1-5/8-inch impeller width. The 10615K is widely used across older Sherwood belt-driven raw-water pumps, but pump-model confirmation remains more reliable than choosing by engine brand alone.