Yamaha – Water Pump Repair Kit | Cooling System Service Kit | 6CJ-W0078-01-00

Overview

Anyone who maintains Yamaha outboards knows the water pump is one of those parts you stay ahead of, not behind. The Yamaha Water Pump Repair Kit 6CJ-W0078-01-00 gives you everything needed to refresh the pump in one service, restoring proper water flow through the engine. When impellers and wear plates start to age, cooling performance drops and temperatures can climb when you least expect it. A complete pump service like this keeps the engine running at the temperatures Yamaha designed it for.

Key Features

• Complete Water Pump Service Kit – Includes the core components needed to rebuild the water pump during routine maintenance.

• OEM Impeller Construction – Nitrile rubber impeller with a brass hub designed for reliable grip and durability during cold starts.

• Restored Pump Clearances – Chrome-plated wear plate and sleeve help restore proper pump tolerances for consistent water flow.

• Pre-Sized Seals and Hardware – Includes pump cup, grommets, O-rings, key, and hardware sized specifically for the pump housing.

• Corrosion Resistant Fasteners – New stainless mounting screws replace old hardware exposed to marine corrosion.

Engine & Boat Compatibility

Compatible with select Yamaha outboard engines that utilize this style of water pump assembly.

Refer to manufacturer fitment information to confirm compatibility with your specific Yamaha engine model.

FAQ

Q: How often should a Yamaha water pump be serviced?
A: Many technicians recommend inspecting or replacing the impeller every season or every 100 hours of operation.

Q: What are signs a water pump needs service?
A: Reduced water stream from the tell-tale, rising engine temperature, or overheating alarms can indicate pump wear.

Q: Is it better to replace the full kit instead of just the impeller?
A: Yes. Replacing the wear plate, seals, and related parts helps restore the pump to proper operating condition.

Q: Can I install a water pump kit myself?
A: Many experienced boat owners can install it by removing the lower unit and following service specifications.

Q: Why is cooling system maintenance so important?
A: The water pump keeps the engine from overheating, which protects internal components and extends engine life.