63D-W0078-03 Yamaha Water Pump Repair Kit | Genuine OEM Yamaha Outboard Part

🔧 Product Description

Genuine Yamaha Water Pump Repair Kit - Part Number: 63D-W0078-03-00

A genuine Yamaha OEM water pump repair kit used for Yamaha 40HP, 50HP and 60HP lower-unit cooling-system service. This kit includes the main water pump service components required to restore pump pressure and cooling-water flow.

⚙️ Key Features

• Genuine Yamaha OEM water pump repair kit
• Correct Yamaha part number 63D-W0078-03-00
• Complete water pump service kit
• Includes cartridge insert, gasket, outer plate, impeller, O-ring, damper, bolts and woodruff key
• Used on Yamaha 40HP to 60HP water pump assemblies where specified

🚤 Compatibility

Commonly used on

• Yamaha 40HP to 60HP lower-unit water pump assemblies
• Yamaha 63D-series water pump service applications

Typically suits

• Engine models:
• Yamaha C40 two-stroke water pump service applications
• Yamaha P40 two-stroke water pump service applications
• Yamaha 40V / 40Y water pump service applications
• Yamaha F40A / F40C / F40D / F40H four-stroke water pump service applications
• Yamaha 50H water pump service applications
• Yamaha F50A / F50D / F50F / F50H four-stroke water pump service applications
• Yamaha FT50B / FT50C high-thrust water pump service applications
• Yamaha F60A / F60B / F60C / F60F four-stroke water pump service applications
• Yamaha T60 / FT60 high-thrust water pump service applications
• HP Range: commonly 40HP - 60HP where specified
• Engine Type: Yamaha outboard lower-unit water pump assembly
• Kit Type: Complete water pump / impeller repair kit

🔌 Function

The water pump repair kit restores cooling-water pump performance by replacing the impeller, insert, gasket and related sealing components that create water pressure and flow.

⚠️ Common Signs of Failure

• Weak tell-tale stream
• Engine overheating
• Temperature alarm
• Impeller blades cracked, missing or permanently bent
• Pump insert scored from sand or debris
• Pump damaged from dry running
• Water pump service due at maintenance interval
• Poor cooling pressure at idle or cruise

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 63D-W0078-03-00 later Yamaha water pump repair kit reference
• 63D-W0078-01-00 related earlier Yamaha water pump repair kit reference
• 63D-W0078-00-00 related earlier Yamaha water pump repair kit reference

OEM / Related Numbers

• 63D-W0078-03-00
• 63D-W0078-03
• 63DW00780300
• 63DW007803
• 63D-W0078-01-00
• 63D-W0078-01
• 63D-W0078-00-00
• 63D-W0078-00

Included / Related Kit Components

• 63D-44312-00-00 Housing Cover
• 63D-44316-00-00 Water Pump Gasket
• 63D-44322-00-00 Cartridge Insert
• 63D-44323-00-00 Outer Plate Cartridge
• 663-44366-01-00 Water Seal Damper
• 6H3-44352-00-00 Impeller
• 90119-08185-00 Bolts with Washer
• 90280-03024-00 Woodruff Key
• 93210-59MG7-00 O-Ring

Aftermarket / Verified Equivalents

• Sierra: 18-3434 water pump repair kit without housing
• Sierra: 18-3415 water pump kit with housing
• Recmar: REC63D-W0078-01
• SeaSierra: 63DW0078 kit family
• Aftermarket reference: HJ YHJB-63D
• Aftermarket reference: 63D-W0078-03 / 63D-W0078-01 / 63D-W0078-00
• Aftermarket water pump kit with housing for Yamaha 40HP / 50HP / 60HP outboards

📦 Condition

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