Sierra 18-3211 Water Pump Impeller Repair Kit, Replaces 384956, for Johnson/Evinrude Outboard Motors

The Sierra 18-3211 Water Pump Impeller Repair Kit is a complete rebuild kit for the water pump on Johnson/Evinrude outboard motors, supplied without the pump housing itself. It is built around a full set of wear components so the pump can be restored to proper cooling performance in a single service, rather than sourcing individual pieces separately.

The kit contains a Sierra 18-3083 impeller along with the housing seal, gasket, impeller key, and O-ring needed to complete the job, giving the installer everything required to replace the parts that typically fail or wear out in a water pump service. Reduced water flow, overheating, or a worn impeller are the usual signs this kit is needed. Because the impeller and its related seals are the parts most prone to wear from dry-running, debris, or age-related hardening, replacing them as a set helps avoid a repeat failure shortly after service.

This kit is designed for use on Johnson/Evinrude outboard engines and directly replaces OEM part number 384956, so it drops in as a factory-equivalent service kit rather than a modified or universal substitute. Sierra states that each of its parts meets or exceeds the original equipment part it replaces. Because fit is specific to the engine and pump housing in use, confirm the part number against your outboard before ordering.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3211
• Product Type: Water Pump Impeller Repair Kit
• Housing Included: Without Housing
• Replaces (OEM): 384956
• Interchangeable With: GLM 12105, Mallory 9-48202
• Kit Contents: Impeller (18-3083), Impeller Housing Seal (18-2536), Impeller Gasket (18-2557), Impeller with Key (18-3059), Impeller Key (18-3138), Impeller Key (18-3299), O-Ring (18-7158), Impeller Plate
• Compatible Engine Application: Johnson/Evinrude outboard motors
• Weight: 0.69 pounds
• Color: White
• Warranty: Limited warranty

Fitment

Fits Johnson/Evinrude outboard motors that use the water pump serviced by OEM part number 384956. Fit is part-specific, so confirm your existing part number before ordering.

Replaces (OEM)

384956

Frequently Asked Questions

What engines does the Sierra 18-3211 impeller kit fit? The Sierra 18-3211 kit is designed for Johnson/Evinrude outboard motors that use the water pump serviced by OEM part number 384956. Confirm your existing pump or impeller part number before ordering since fit is part-specific.

Does this kit include the water pump housing? No, the Sierra 18-3211 kit is supplied without the pump housing. It includes the impeller and the seals, gasket, keys, and O-ring needed to rebuild the pump, but the housing itself is not part of this kit.

What OEM part number does the 18-3211 kit replace? Sierra 18-3211 directly replaces OEM part number 384956.

Is the 18-3211 kit compatible with GLM or Mallory parts? Yes, the Sierra 18-3211 kit is interchangeable with GLM 12105 and Mallory 9-48202.

What is included in the box with the 18-3211 kit? The kit contains one impeller (18-3083), one impeller housing seal (18-2536), one impeller gasket (18-2557), one impeller with key (18-3059), two impeller keys (18-3138 and 18-3299), one O-ring (18-7158), and one impeller plate.

How much does the Sierra 18-3211 kit weigh? The Sierra 18-3211 Water Pump Impeller Repair Kit weighs 0.69 pounds.

What color is the impeller in this kit? The impeller included in the Sierra 18-3211 kit is white.

Is Sierra 18-3211 a genuine OEM part or an aftermarket replacement? Sierra 18-3211 is an aftermarket replacement kit. Sierra states that each of its parts meets or exceeds the original equipment part it replaces, in this case OEM number 384956.

Why does the impeller need to be replaced along with the seals and gasket? Servicing a water pump with the full 18-3211 kit, rather than just the impeller, replaces the seals, gasket, and O-ring that typically wear alongside it, reducing the chance of a leak or repeat failure shortly after installation.

What are the signs that this water pump kit is needed? Reduced water flow, engine overheating, or a visibly worn or cracked impeller are common signs that a water pump service using the Sierra 18-3211 kit is needed.