Rareelectrical Water Pump Kit Compatible With 1989-1997 Yamaha Mercury Mariner 40Hp 2-Stroke Outboard Impeller Gasket Seal Wear Plate 2-Cyl Replaces 679-W0078-01-00 84363M 679-W0078-00-00

MERCURY / MARINER 40HP OUTBOARD: Mercury 40HP 2-Cyl 2.875 Bore Cross Flow 2-Stroke (1970-1982) Mercury / Mariner 40HP 4-Cyl 2.565 Bore Cross Flow 2-Stroke (1989-1992) YAMAHA / MARINER 40HP OUTBOARD: Yamaha 40HP 2-Cyl Commercial 2-Stroke (1991-1997) Mariner 40HP 2-Cyl M40B/M40C Thru-Hub Exhaust 2-Stroke (1993-1998) OEM PART NUMBERS: Yamaha: 679-W0078-A1-00 / 679-W0078-A0-00 / 679-W0078-01-00 / 679-W0078-00-00 Yamaha: 6F5-W0078-00-00 / 6F5-W0078-A0-00 Mercury: 84363T / 84363M Yamaha Mercury 40HP Water Pump Impeller Kit — 2-Stroke Outboard: Premium replacement water pump service kit for 40HP 2-stroke outboard engines. Replaces Yamaha OEM 679-W0078-A1-00 (and five superseded Yamaha numbers) plus Mercury OEM 84363T and 84363M. The water pump impeller is the most critical maintenance item on any outboard motor — it provides all engine cooling water flow. A worn or damaged impeller causes overheating, which can destroy powerhead components. This comprehensive kit includes the impeller, drive key, insert cup, wear plate, gaskets, seal, and mounting hardware. Housing is NOT included. Yamaha recommends impeller replacement every 300 hours or annually, whichever comes first. Manufactured to OEM standards for reliable cooling system performance. ADDITIONAL CROSS-REFERENCES: Yamaha: 679-W0078-A1-00 / 679W0078A100 (Current) Yamaha: 679-W0078-A0-00 / 679W0078A000 Yamaha: 679-W0078-01-00 / 679W007800100 Yamaha: 679-W0078-00-00 / 679W007800000 Yamaha: 6F5-W0078-00-00 / 6F5W007800000 Yamaha: 6F5-W0078-A0-00 / 6F5W0078A000 Bolt with Washer Note: Housing NOT included ⚠️ IMPORTANT: Verify OEM part number before ordering to ensure proper fitment.

• Compatible with Mercury,Yamaha. Please verify your OEM part number from your original unit to help ensure fitment.
• Replaces: Oem Part Numbers — Yamaha: / Yamaha: 679-W0078-A1-00 / 679W0078a100 (Current) / Yamaha: 679-W0078-A0-00 / 679W0078a000 / Yamaha: 679-W0078-01-00 / 679W007800100 / Yamaha: 679-W0078-00-00 / 679W007800000 / Yamaha: 6F5-W0078-00-00 / 6F5w007800000 / Yamaha: 6F5-W0078-A0-00 / 6F5w0078a000 / Oem Part Numbers — Mercury / Mariner: / Mercury: 84363T / Mercury: 84363M / Kit Contents: / Water Pump Impeller / Impeller Key / Insert Cup / Wear Plate /
• Applications: Mercury Outboard — 2-Cylinder 2.875 Bore Cross Flow 40Hp 2-Stroke: / Mercury 40Hp 2-Cylinder 2.875 Bore Cross Flow 2-Stroke Outboard (1970-1982) / Mercury / Mariner Outboard — 4-Cylinder 2.565 Bore Cross Flow 40Hp 2-Stroke: / Mercury / Mariner 40Hp 4-Cylinder 2.565 Bore Cross Flow 2-Stroke Outboard (1989-1992) / Yamaha Outboard — 2-Cylinder Commercial 40Hp 2-Stroke: / Yamaha 40Hp 2-Cylinder Commercial 2-Stroke Outboard (1991-1997) / Mariner Outboard — 40Hp
• Applications: (1991-1997) / / Mariner Outboard — 40Hp 2-Cylinder 2-Stroke: / Mariner 40Hp 2-Cylinder 2-Stroke Outboard M40b / M40c Thru-Hub Exhaust (1993-1998) / ...
• Water Pump Service Kit Source: Aftermarket