Sierra Water Pump Kit with Housing 18-3461, Replaces 6H3-44311-00-00, for Yamaha 70 (1984-91), P60 (1991), T50 (1996) Outboards

The Sierra 18-3461 Water Pump Kit with Housing is a complete replacement kit for the water pump on select Yamaha outboard engines, built to restore proper cooling-system flow when the original housing, gasket, or impeller components wear out or fail. The kit includes the water pump housing along with the gasket needed to reseal the pump against the lower unit, so the job can be completed without hunting down individual components separately. Sierra assembles its water pump kits to meet or exceed original equipment specifications, and the impeller compound used in Sierra kits is formulated for the size and application of the pump, giving the rebuilt pump reliable performance once installed.

This kit is intended for outboard engines that rely on a water pump housing and gasket assembly to direct raw water to the powerhead for cooling. It is designed as a direct fit for the Yamaha applications listed below, and it replaces the original equipment water pump housing and pump body assemblies referenced under this part number. Because a failed or worn water pump housing or gasket can lead to overheating, replacing the full kit rather than a single worn component helps ensure the reassembled pump seals and performs correctly.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3461
• Product Type: Water Pump Kit with Housing
• Kit Contents: Water Pump Housing (Sierra 18-0240), Water Pump Gasket (Sierra 18-0256)
• Fitment: Yamaha 70 (1984-91), P60 (1991), T50 (1996)
• Replaces (OEM): 6H3-W0078-00-00, 6H3-44311-00-00
• Weight: 0.64 pounds
• Package Dimensions: 13.2 L x 14 W x 14.6 H (cm)
• UPC: 808282287054

Fitment

• Yamaha 70 (1984-91)
• Yamaha P60 (1991)
• Yamaha T50 (1996)

Replaces (OEM)

• 6H3-W0078-00-00
• 6H3-44311-00-00

Frequently Asked Questions

What engines does the Sierra 18-3461 water pump kit fit? The 18-3461 kit fits Yamaha 70 (1984-91), P60 (1991), and T50 (1996) outboard engines.

What is included in the Sierra 18-3461 water pump kit? The kit includes a water pump housing (Sierra 18-0240) and a water pump gasket (Sierra 18-0256), giving you the housing and seal needed to rebuild the pump assembly.

Does the 18-3461 kit include the impeller? The 18-3461 kit as listed contains the water pump housing and gasket; it does not list a separate impeller component in its contents.

What OEM part numbers does the 18-3461 kit replace? This kit replaces OEM numbers 6H3-W0078-00-00 and 6H3-44311-00-00 on the applicable Yamaha outboards.

How much does the Sierra 18-3461 water pump kit weigh? The kit weighs 0.64 pounds.

Is the Sierra 18-3461 a genuine Yamaha part or an aftermarket replacement? 18-3461 is a Sierra-manufactured replacement kit built to meet or exceed the original equipment specifications for the listed Yamaha water pump housing and gasket.

Why replace the whole water pump kit instead of just the impeller? Because the 18-3461 kit bundles the housing and gasket together, replacing both at once ensures the reassembled pump seals properly rather than reusing a worn housing or gasket alongside new parts.

What are the package dimensions of the 18-3461 kit? The 18-3461 water pump kit ships in packaging measuring 13.2 L x 14 W x 14.6 H (cm).

Will the 18-3461 kit fit any Yamaha outboard? No, 18-3461 is designed for the specific Yamaha 70 (1984-91), P60 (1991), and T50 (1996) applications listed for this part; it is not a universal fit.

What UPC is associated with the Sierra 18-3461 kit? The Sierra 18-3461 water pump kit carries UPC 808282287054.