Yamaha – Water Pump Repair Kit | Cooling System Service | 66T-W0078-00-00

Overview

A healthy water pump is one of the most important parts of keeping a Yamaha outboard running cool. The Yamaha 66T-W0078-00-00 Water Pump Repair Kit provides the core components needed to rebuild the pump assembly and restore proper cooling water flow. Over time, impellers wear down and seals harden from heat and debris moving through the system. Installing a complete kit during routine maintenance helps maintain steady cooling performance and protects the engine when it is working hard on long runs or hot days on the water.

Key Features

• Complete Water Pump Service Kit – Includes essential components needed to rebuild the water pump assembly.

• Restores Cooling Performance – Helps maintain proper water circulation through the engine to prevent overheating.

• Genuine Yamaha Components – Manufactured to Yamaha specifications for dependable fit and performance.

• Routine Maintenance Solution – Ideal for scheduled cooling system service on compatible Yamaha four stroke outboards.

Engine & Boat Compatibility

• F30 - 2001-2005
• F40 - 2000-2009
• T25 - 2001-2016

FAQ

Q: How often should a water pump be serviced on these engines?
A: Many Yamaha technicians recommend servicing the pump every two to three seasons or roughly every two hundred operating hours.

Q: What are signs that the water pump may need service?
A: Weak telltale water flow, overheating alarms, or fluctuating engine temperatures can indicate pump wear.

Q: Should the full repair kit be installed instead of just the impeller?
A: Installing the full kit replaces multiple wear components at once, helping the pump perform properly.

Q: Does operating in sandy or shallow water affect pump life?
A: Yes. Sand and debris can wear down the impeller and internal pump surfaces faster.

Q: Is water pump service typically done during other maintenance?
A: It often is. Many owners service the pump when the lower unit is removed for gear oil changes or seasonal inspections.

• Supersessions
  66T-W0078-01-00, 66T-W0078-01-00