Sierra Water Pump Impeller Repair Kit 18-3212-1, Replaces 984461, for OMC Water Pumps

The Sierra Water Pump Impeller Repair Kit, part number 18-3212-1, is a complete rebuild kit for OMC water pump housings that need a fresh impeller along with the sealing hardware required to reinstall it correctly. Rather than sourcing an impeller, gasket, and O-ring separately, this kit bundles everything into one part number so the water pump housing can be rebuilt in a single service. The kit includes a replacement impeller (18-3058), a water pump housing gasket (18-2916), and an O-ring (18-2541), each matched to the OEM specifications of the components they replace. Using a matched kit like this helps ensure the water pump housing reseals properly, which is critical to maintaining cooling water flow through the engine. This kit is built by Sierra, a long-standing manufacturer of marine engine parts, and is intended as a direct equivalent for OEM part number 984461. Boat owners servicing an OMC water pump can use this kit at the same time as a full water pump service to replace all of the wear items in one step, rather than reinstalling a used gasket or O-ring alongside a new impeller.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3212-1
• Product Type: Water Pump Impeller Repair Kit
• Kit Contents: Impeller (18-3058), Water Pump Housing Gasket (18-2916, O.E.M. 911702), O-Ring (18-2541, O.E.M. 911704)
• OEM Cross Reference: 984461
• Weight: 0.46 pounds
• UPC: 808282243845

Fitment

• Designed for OMC water pump housings that use impeller and gasket assembly 984461

Replaces (OEM)

• 984461

Frequently Asked Questions

What does the Sierra 18-3212-1 impeller repair kit include? The kit contains three components for a water pump housing rebuild: an impeller (part 18-3058), a water pump housing gasket (part 18-2916, O.E.M. 911702), and an O-ring (part 18-2541, O.E.M. 911704).

Is 18-3212-1 a direct replacement for OEM part 984461? Yes, Sierra part 18-3212-1 replaces OEM part number 984461.

How much does this impeller kit weigh? The Sierra 18-3212-1 impeller repair kit weighs 0.46 pounds.

Do I need any other parts to rebuild my water pump with this kit? The 18-3212-1 kit supplies the impeller, housing gasket, and O-ring needed for the water pump housing itself; it does not include the water pump housing or additional hardware beyond these three parts.

Is the impeller in kit 18-3212-1 sold separately? Yes, the impeller included in this kit is Sierra part number 18-3058, which is one of the three components bundled into the 18-3212-1 repair kit.

What gasket comes with the 18-3212-1 kit? A water pump housing gasket, Sierra part 18-2916 with O.E.M. Number 911702, is included in the 18-3212-1 impeller repair kit.

What O-ring is included in this repair kit? An O-ring identified as Sierra part 18-2541 with O.E.M. Number 911704 is included in the 18-3212-1 kit.

Is this a genuine Sierra part or an aftermarket copy? The 18-3212-1 impeller repair kit is manufactured by Sierra and is not a used or reconditioned part.

Why replace the gasket and O-ring along with the impeller? Kit 18-3212-1 bundles the gasket and O-ring with the impeller so the water pump housing can be resealed with fresh components in the same service, rather than reusing a worn gasket or O-ring alongside a new impeller.

What is the UPC for the Sierra 18-3212-1 kit? The UPC for Sierra impeller repair kit 18-3212-1 is 808282243845.