66T-44311-00 Yamaha Water Pump Housing | Genuine OEM Yamaha Outboard Part

🔧 Product Description

Genuine Yamaha Lower-Unit Water Pump Housing - Part Number: 66T-44311-00

A genuine Yamaha water-pump housing for selected F25, T25, F30 and F40 four-stroke outboards.

The housing encloses the flexible impeller and directs water from the lower-unit inlet into the engine cooling tube. Its internal surface must remain smooth and correctly shaped for the impeller to generate reliable suction and pressure.

⚙️ Key Features

• Genuine Yamaha OEM water-pump housing
• Correct Yamaha part number 66T-44311-00
• Designed for the 66T-series lower-unit water pump
• Fits selected 25HP to 40HP four-stroke outboards
• Cross-references with Recmar / Parsun housing and complete aftermarket pump kits

🚤 Compatibility

Commonly used on

• Yamaha 25HP to 40HP four-stroke lower-unit water pumps
• Tiller and remote-control models using the 66T-series gearcase

Typically suits

• Engine models:
• Yamaha F25 four-stroke 2-cylinder
• Yamaha T25 four-stroke - approximately 2001-2005
• Yamaha F30 four-stroke - approximately 2001-2005
• Yamaha F40 four-stroke 3-cylinder - approximately 2000 onward
• Yamaha F40A and F40B applications using the 66T-series pump
• Yamaha 25HP, 30HP and 40HP four-stroke gearcases using repair kit 66T-W0078-01
• HP Range: 25HP - 40HP
• Engine Type: Yamaha four-stroke outboard
• Year Range: Approximately 2000 - 2019, dependent on lower-unit design

🔌 Function

The housing surrounds the water-pump impeller and forms the chamber required to create suction and cooling-water pressure. It directs pumped water into the engine's cooling tube.

⚠️ Common Signs of Failure

• Internal housing surface is scored or melted
• Weak or absent tell-tale stream
• Engine overheats despite installation of a new impeller
• Housing is cracked, distorted or corroded
• Water leaks around the pump outlet or base

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 66T-44311-00 current Yamaha OEM water-pump housing reference

OEM / Related Numbers

• 66T-44311-00
• 66T-44311-00-00
• 66T443110000
• 63D-44311-01 related replacement housing reference
• 66T-W0078-01 related water-pump repair kit
• 66T-44322-00 related pump insert
• 66T-44352-00 related impeller

Aftermarket / Verified Equivalents

• Recmar / Parsun: PAF15-04000201
• Aftermarket housing: 63D-44311-01
• Sierra complete water-pump kit with housing: 18-3413

📦 Condition

• Genuine Yamaha part
• Brand new
• Supplied in original or equivalent packaging