Sierra Water Pump Kit 18-3240 for Chrysler/Force 9.9-25 HP Outboards

The Sierra 18-3240 is a water pump impeller kit built for Chrysler and Force outboard motors. This kit restores cooling system performance on outboards that rely on a rubber impeller to circulate raw water through the engine block, and it is designed to meet or exceed original equipment specifications for fit and durability. Sierra formulates its impeller compounds based on the specific size and application of each kit, and every other component in the kit is built to match original manufacturer standards, so buyers get consistent, reliable performance without guessing at compatibility.

This kit is intended for outboard owners performing routine water pump maintenance or replacing a worn or cracked impeller that is no longer pumping water efficiently, a common cause of overheating in outboard motors. The kit is finished in white and is packaged as a single, complete unit for straightforward installation during a water pump service.

Fitment covers a range of Chrysler/Force outboard horsepower ratings and model years, so it is important to confirm the horsepower and year of your outboard against the fitment list before ordering, since Chrysler/Force introduced a different impeller kit for some later engine serial number ranges.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3240
• Product Type: Outboard Water Pump Kit (Impeller Kit)
• Color: White
• Weight: 0.15 pounds
• Included Components: Water pump kit (impeller and kit components)
• Number of Items: 1
• UPC: 808282160005
• Vehicle Service Type: Boat
• Compatible Engine Type: Chrysler/Force outboard motors

Fitment

• Chrysler/Force 9.9 HP, 1979-1997, All models
• Chrysler/Force 10 HP, 1974-1978, All models
• Chrysler/Force 12 HP, 1979, All models
• Chrysler/Force 15 HP, 1974-1997, All models
• Chrysler/Force 20 HP, 1973-1978, All models
• Chrysler/Force 20 HP, 1979-1982, All models
• Chrysler/Force 25 HP, 1973-1978, All models

Frequently Asked Questions

What is the Sierra 18-3240 water pump kit used for? It is an impeller kit for servicing the water pump on Chrysler and Force outboard motors, replacing the rubber impeller and related components that circulate cooling water through the engine.

Which Chrysler/Force outboard horsepower models does 18-3240 fit? The 18-3240 kit covers Chrysler/Force 9.9 HP (1979-1997), 10 HP (1974-1978), 12 HP (1979), 15 HP (1974-1997), 20 HP (1973-1978 and 1979-1982), and 25 HP (1973-1978) outboards.

Does the 18-3240 kit fit the 1996-1998 25 HP Chrysler/Force outboard? No. The 1996-1998 25 HP Chrysler/Force outboard (serial number range E127700 to E344999) uses a different Sierra impeller kit, 18-3215, rather than 18-3240.

What is included with the Sierra 18-3240 kit? The 18-3240 kit ships as a complete water pump kit containing the impeller and the other components needed for a water pump service, packaged as a single unit.

How much does the Sierra 18-3240 water pump kit weigh? The 18-3240 water pump kit weighs 0.15 pounds.

What color is the Sierra 18-3240 water pump kit? The kit is finished in white.

Is the Sierra 18-3240 an OEM part or aftermarket replacement? The 18-3240 is a Sierra-branded aftermarket water pump kit built to meet or exceed original equipment specifications for Chrysler/Force outboards.

Will 18-3240 fit a 30 HP or 35 HP Chrysler/Force outboard? No, the 18-3240 fitment range covers 9.9 HP through 25 HP Chrysler/Force outboards; 30 HP and 35 HP models are not included in its fitment.

What years does the 18-3240 kit cover for a 20 HP Chrysler/Force outboard? For 20 HP Chrysler/Force outboards, 18-3240 fits both the 1973-1978 model years and the 1979-1982 model years.

Is a thermostat included with the 18-3240 water pump kit? No, a thermostat is not part of the 18-3240 water pump kit.

What is the UPC for the Sierra 18-3240 water pump kit? The UPC for the Sierra 18-3240 water pump kit is 808282160005.

How is the 18-3240 impeller kit different from a standalone impeller? The 18-3240 is a full kit containing the impeller along with the other water pump service components, rather than just a single replacement impeller.