Water Pump Service Kit - Mercury / Yamaha 40 HP (1970-1982, 1989-1997) OEM# 18-3374 | WSM 725-412

Water Pump Service Kit Mercury / Yamaha 40 Hp OEM# 18-3374

This WSM water pump service kit is a quality aftermarket replacement part designed for Mercury 2 Cyl 2.875 Bore Cross Flow 40 and 2 other compatible models.

It replaces selected OEM reference numbers including 18-3374, 18-3397, 679-W0078-00-00, 679-W0078-01-00, 679-W0078-A0-00, 679-W0078-A1-00, 84363M, 84363T and is suitable for service, repair and rebuild work.

Key Features

• Quality aftermarket replacement part from WSM
• Engineered for dependable fit, function and service life
• Designed for marine and powersports repair and maintenance
• Compatible with 24 listed fitments
• Replaces selected OEM reference numbers listed below

Product Details

• Brand: WSM
• WSM Part Number: 725-412
• Product: Water Pump Service Kit
• OEM Reference: 18-3374, 18-3397, 679-W0078-00-00, 679-W0078-01-00, 679-W0078-A0-00, 679-W0078-A1-00, 84363M, 84363T
• Application: Mercury 2 Cyl 2.875 Bore Cross Flow 40 and 2 other compatible models

Product Fitment

This part is suitable for the following models:

• Mercury 2 Cyl 2.875 Bore Cross Flow 40 – 1970
• Mercury 2 Cyl 2.875 Bore Cross Flow 40 – 1971
• Mercury 2 Cyl 2.875 Bore Cross Flow 40 – 1972
• Mercury 2 Cyl 2.875 Bore Cross Flow 40 – 1973
• Mercury 2 Cyl 2.875 Bore Cross Flow 40 – 1974
• Mercury 2 Cyl 2.875 Bore Cross Flow 40 – 1975
• Mercury 2 Cyl 2.875 Bore Cross Flow 40 – 1976
• Mercury 2 Cyl 2.875 Bore Cross Flow 40 – 1977
• Mercury 2 Cyl 2.875 Bore Cross Flow 40 – 1978
• Mercury 2 Cyl 2.875 Bore Cross Flow 40 – 1979
• Mercury 2 Cyl 2.875 Bore Cross Flow 40 – 1980
• Mercury 2 Cyl 2.875 Bore Cross Flow 40 – 1981
• Mercury 2 Cyl 2.875 Bore Cross Flow 40 – 1982
• Mercury 4 Cyl 2.565 Bore Cross Flow 40 – 1989
• Mercury 4 Cyl 2.565 Bore Cross Flow 40 – 1990
• Mercury 4 Cyl 2.565 Bore Cross Flow 40 – 1991
• Mercury 4 Cyl 2.565 Bore Cross Flow 40 – 1992
• Yamaha 2 Cyl Commercial 40 – 1991
• Yamaha 2 Cyl Commercial 40 – 1992
• Yamaha 2 Cyl Commercial 40 – 1993
• Yamaha 2 Cyl Commercial 40 – 1994
• Yamaha 2 Cyl Commercial 40 – 1995
• Yamaha 2 Cyl Commercial 40 – 1996
• Yamaha 2 Cyl Commercial 40 – 1997

Why Buy WSM

WSM is a trusted manufacturer of aftermarket marine and powersports parts, known for dependable quality, strong fitment coverage and workshop-ready replacement components.

You May Also Need

Browse related parts for compatible models:

• Water Pump Impeller Mercury / Mariner 30 - 70 Hp OEM# 18-3007 – 700-200
• Bolt Connecting Rod Force / Mercury / Mariner 20 - 150 Hp OEM# 10-91012 – 805-200
• Bolt Connecting Rod Force / Mercury / Mariner 20 - 150 Hp (4 Pack) OEM# 10-91012 – 805-200-04
• Bolt Connecting Rod Force / Mercury / Mariner 20 - 150 Hp (6 Pack) OEM# 10-91012 – 805-200-06

Please use the fitment guide, OEM references and images to confirm this is the correct part before ordering.