Description
SIERRA Mercury/Force 15-25 HP Water Pump Impeller – 18-3057
Water-pump impeller for various 15-25 HP Mercury/Force/US Marine outboards using 47-85089-family impellers. Sierra designs the replacement around the specified OEM pump geometry and interchange references.
- Application: various 15-25 HP Mercury/Force/US Marine outboards using 47-85089-family impellers
- Function: Circulates raw cooling water through the engine cooling system; a worn, hardened or damaged impeller can reduce water flow and cause overheating.
- Component: Flexible water-pump impeller
- Blade count: 6
- Interchange: Chrysler/Force/US Marine: 47-850893; GLM: 89640; Mallory: 9-45303, 9-45303-10; Mercury Marine: 47-85089, 47-850891, 47-8508910, 47-8508920, 47-850893, 47-8M0024502, 47-8M0027792, 47-8M0204712
Verify the engine model, serial range, pump housing and original impeller number before installation. Inspect the housing, wear plate, key and gaskets at the same time; replace damaged companion parts rather than installing a new impeller into a worn pump.
Specifications
- Component: Flexible water-pump impeller
- Blade count: 6
Interchange / Replaces
- Chrysler/Force/US Marine: 47-850893
- GLM: 89640
- Mallory: 9-45303, 9-45303-10
- Mercury Marine: 47-85089, 47-850891, 47-8508910, 47-8508920, 47-850893, 47-8M0024502, 47-8M0027792, 47-8M0204712
Related Products
- Upsell / complete repair: SIE-18-4531
- Relationship notes: 18-4531 is a stocked Sierra water-pump repair kit documented for this impeller/application family.

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