Sierra 18-8900 Impeller, Replaces Chrysler Force 47-19453, Fits 70 HP (1991-95) and 75 HP (1996-98) Outboards

The Sierra 18-8900 is a water pump impeller engineered as a direct replacement for the original equipment impeller on select outboard engines. The impeller is the core wear component of a marine water pump, drawing raw water through the pump housing to cool the engine and keep it running within safe operating temperatures. As a rubber-bladed rotor, it flexes with each rotation to move water continuously; over time and use, the rubber vanes wear, crack, or take a set, reducing flow and putting the engine at risk of overheating, so periodic replacement is a standard part of outboard maintenance.

Sierra manufactures this impeller to meet or exceed the performance of the original part it replaces, using materials and tolerances intended to hold up in continuous marine service. It is designed to fit engines rated at 70 horsepower for the 1991-95 model years within serial number range E138600-E345999, and 75 horsepower for the 1996-98 model years within the same serial number range E138600-E345999. Always confirm the engine's horsepower rating and serial number against these ranges before ordering, since impeller part numbers vary by model year and serial number on these engines.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-8900
• Item Type: Impeller
• Weight: 0.09 pounds
• Unit Count: 1
• Included Components: Impeller
• Engine Type: 4 Stroke
• Mounting Type: Engine Mount
• Fuel Type: Gasoline
• Maximum Horsepower: 75 Horsepower
• OEM Equivalent Part Number: CHRYSLER FORCE 47-19453

Fitment

• 70 HP, 1991-95, Serial No. E138600-E345999
• 75 HP, 1996-98, Serial No. E138600-E345999

Replaces (OEM)

• CHRYSLER FORCE 47-19453

Frequently Asked Questions

What engines does the Sierra 18-8900 impeller fit? It fits 70 horsepower outboards for the 1991-95 model years within serial number range E138600-E345999, and 75 horsepower outboards for the 1996-98 model years within that same serial number range E138600-E345999.

How do I know if my engine's serial number is in the correct range? Check your outboard's serial number tag against the range E138600-E345999; the 18-8900 impeller is designed for engines within that specific serial number range, and using it outside that range risks an incorrect fit.

Does the 18-8900 replace an OEM Chrysler Force part? Yes, the Sierra 18-8900 is a replacement for Chrysler Force OEM part number 47-19453.

How much does the 18-8900 impeller weigh? The Sierra 18-8900 impeller weighs 0.09 pounds.

How many impellers come in the package? One Sierra 18-8900 impeller is included per package, sold as a single unit.

Is the Sierra 18-8900 a genuine OEM part or aftermarket? The 18-8900 is a Sierra-manufactured part designed to meet or exceed the performance of the original equipment impeller it replaces, rather than a part sourced directly from the original engine manufacturer.

What is the maximum horsepower rating for this impeller? The Sierra 18-8900 is rated for engines up to 75 horsepower.

Why does my outboard need a new impeller? Water pump impellers like the 18-8900 wear down over time as their rubber vanes flex with each rotation, and worn vanes reduce raw water flow to the engine, which can lead to overheating if not replaced.

Is the 18-8900 an engine-mounted water pump component? Yes, the 18-8900 impeller is designed for an engine-mount type water pump.

Does the 18-8900 come with a thermostat or gasket kit? No, the package includes only the impeller; the Sierra 18-8900 does not include a thermostat or gasket kit.

What fuel type of engine is the 18-8900 designed for? The Sierra 18-8900 is designed for gasoline-powered outboard engines.

Is the 18-8900 backed by a warranty? Yes, the Sierra 18-8900 impeller is backed by Sierra's limited warranty.