Water Pump Impeller Kit for Yamaha 50 60 70 HP Outboards - Complete

In this review the Water Pump Impeller Kit for Yamaha 50 60 70 HP outboards is evaluated for boat owners who need a complete, drop-in replacement for the engine cooling pump. The kit's single biggest selling point is that it includes the water pump housing and all internal components, so a full mid-season repair can be completed without extra parts. That makes it a practical choice for DIY mechanics and small marinas seeking a one-purchase solution for common Yamaha 50-70 HP models.

Key Features

• Complete kit: Includes impeller, impeller key, insert cup and wear plate so you get everything needed for internal assembly without sourcing extra parts.
• Housing included: Comes with the water pump housing and gaskets so the repair covers both internal and external sealing surfaces for a proper rebuild.
• Direct fit intent: Designed to replace Yamaha 6H3-W0078 variants and Sierra 18-3461/18-3466 numbers for compatibility with many 50HP to 70HP models.
• Seal and O-ring: The kit supplies an O-ring and gaskets to address typical leakage points during removal and reassembly.
• Hardware supplied: Bolts and fasteners are included so the pump can be remounted without separate hardware purchases.

Who It's For

This kit is best for owners of Yamaha T50, FT50, T60, FT60 and related 50HP to 70HP outboard motors who want a comprehensive repair package that avoids multiple orders and potential downtime. It suits DIYers comfortable with removing the lower unit and replacing the impeller and housing, as well as marine technicians performing routine cooling system service.

Those who should look elsewhere are owners of models outside the listed fitment range or anyone who only needs a single spare impeller without housing and gaskets. Also, if exact hole sizes and seals are a concern, verify fit against the specific engine serial or consult a dealer, since some customers reported mixed fit feedback on uncommon variants.

Pros & Cons

Pros

• Complete replacement: includes housing, wear plate and all internal pieces to finish a full rebuild in one box.
• Intended compatibility: lists replacements for several Yamaha part numbers and Sierra cross references to simplify selection.
• Convenient hardware: comes with bolts and gaskets so fewer trips to the parts store are needed.

Cons

• Fit variability: some buyers reported mixed fit and hole size issues on nonstandard models, so confirmation is advisable before installation.
• Durability concerns: a few users noted parts broke early in service life, so inspect components during installation and keep a spare impeller on hand.

Specifications

Product type	Water pump impeller kit with housing
Compatible engines	Yamaha 50HP, 60HP, 70HP outboards
Applicable models	T50, FT50B/C/G/J, T60, FT60B/D/G, 60F, P60, E60, C60, 70B, C70
Replaces	Yamaha 6H3-W0078 variants, 6H3-44311-00-00; Sierra 18-3461, 18-3466
Package contents	Impeller, impeller key, insert cup, O-ring, wear plate, gaskets, bolts, water pump housing
Brand	UANOFCN

Our Verdict

The kit is a practical, cost-effective option for those needing a full pump rebuild on Yamaha 50-70 HP outboards because it bundles the housing and internal parts in one purchase. It represents good value for DIYers and service shops, provided fitment is double-checked against the specific engine variant, and installers pay attention to known seal and durability notes reported by some users.

Frequently Asked Questions

Will this fit my Yamaha 60HP?
It is designed for many Yamaha 60HP models listed such as FT60B and FT60D; verify your engine model code against the kit fitment list before purchase.

Are all gaskets and bolts included?
Yes, the package lists gaskets, bolts and an O-ring along with the impeller, wear plate and housing for a full rebuild.

What if a part breaks after installation?
Some customers reported early failures on a few components, so inspect parts during install and keep a spare impeller or replacement part available if concerned.