Sierra 18-3148 Water Pump Repair Kit Without Housing, Replaces Mercury 46-84277M and 46-84277T

The Sierra 18-3148 Water Pump Repair Kit is a without-housing rebuild kit that restores a worn outboard water pump using the original housing already installed on the engine. Rather than replacing the entire pump body, this kit supplies the internal wear components that fail first: the impeller, wear plate gasket, o-ring, and woodruff key. It directly replaces Mercury Marine 46-84277M and 46-84277T water pump service kits, making it a drop-in solution for engines built around that pump configuration.

The kit is built for Yamaha outboard applications in the 2-stroke water pump and impeller category, and the individual components carry their own OEM cross-references: the impeller corresponds to O.E. Number 47-84027M, and the woodruff key corresponds to O.E. Number 28-8192M. Rebuilding with a matched kit like this, rather than sourcing individual parts separately, helps ensure the impeller, gasket, and key are dimensionally matched to seal correctly against the existing housing and maintain proper cooling water flow.

Because the housing is not included, this kit is intended for owners whose existing pump housing is still in good condition and only the wear components need replacement. Each component meets or exceeds the quality of the original equipment part it replaces.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3148
• Product Type: Water Pump Repair Kit
• Configuration: Without Housing
• Application: Yamaha Outboard, 2-Stroke
• Included Components: Impeller (18-3074), Wear Plate Gasket (18-0768), O-Ring (25-26722), Woodruff Key (18-3305)
• Impeller OEM Cross-Reference: 47-84027M
• Woodruff Key OEM Cross-Reference: 28-8192M
• Number of Items: 1
• Weight: 0.36 pounds
• UPC: 808282234379

Fitment

• Fits engines and pump assemblies that use Mercury Marine 46-84277M or 46-84277T water pump repair kits
• Used on Yamaha outboard 2-stroke engines equipped with the compatible pump housing

Replaces (OEM)

• 46-84277M
• 46-84277T

Frequently Asked Questions

What is included in the Sierra 18-3148 water pump kit? The kit contains an impeller (18-3074), a wear plate gasket (18-0768), an o-ring (25-26722), and a woodruff key (18-3305) for rebuilding the water pump.

Does the 18-3148 kit include the pump housing? No, the Sierra 18-3148 is a without-housing kit, meaning it supplies only the internal wear components and reuses the existing pump housing already on the engine.

What OEM part numbers does the Sierra 18-3148 replace? It replaces Mercury Marine 46-84277M and 46-84277T water pump repair kits.

Is the 18-3148 kit compatible with Yamaha outboards? Yes, this kit is categorized for Yamaha outboard 2-stroke engines that use the corresponding water pump housing.

What is the OEM cross-reference for the impeller included in this kit? The impeller included in the Sierra 18-3148 kit cross-references to O.E. Number 47-84027M.

What is the OEM cross-reference for the woodruff key in the 18-3148 kit? The woodruff key supplied in this kit cross-references to O.E. Number 28-8192M.

How much does the Sierra 18-3148 water pump kit weigh? It weighs 0.36 pounds.

Is Sierra 18-3148 a genuine part or an aftermarket equivalent? It is a Sierra-manufactured replacement kit engineered to meet or exceed the quality of the original equipment components it replaces.

When should I choose a without-housing kit like 18-3148 instead of a full water pump assembly? A without-housing kit such as the Sierra 18-3148 is the right choice when the existing pump housing is still in good condition and only the internal wear parts (impeller, gasket, o-ring, key) need replacement.

What is the UPC for the Sierra 18-3148 kit? The UPC for the Sierra 18-3148 water pump repair kit is 808282234379.

Can I buy the impeller from the 18-3148 kit separately? Within this kit the impeller is identified as part 18-3074, with OEM cross-reference 47-84027M.

How many of each part are in the Sierra 18-3148 kit? The kit ships as one complete set: one impeller, one wear plate gasket, one o-ring, and one woodruff key.