Screw Oil Injection Block Off - Mercury / Mariner 50-200 HP (1970, 1978-1988) OEM# 10-29911 | WSM 810-250

Screw Oil Injection Block Off Mercury / Mariner 50 - 200 Hp OEM# 10-29911

This WSM screw oil injection block off is a quality aftermarket replacement part designed for Mercury 4 Cyl 2.565 Bore Cross Flow 50 and 3 other compatible models.

It replaces selected OEM reference numbers including 10-29911, 10-41506 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 21 listed fitments
• Replaces selected OEM reference numbers listed below

Product Details

• Brand: WSM
• WSM Part Number: 810-250
• Product: Screw Oil Injection Block Off
• OEM Reference: 10-29911, 10-41506
• Application: Mercury 4 Cyl 2.565 Bore Cross Flow 50 and 3 other compatible models

Product Fitment

This part is suitable for the following models:

• Mercury 4 Cyl 2.565 Bore Cross Flow 50 – 1970
• Mercury 6 Cyl 3.125 Bore 2L 150 – 1978
• Mercury 6 Cyl 3.125 Bore 2L 150 – 1979
• Mercury 6 Cyl 3.125 Bore 2L 150 – 1980
• Mercury 6 Cyl 3.125 Bore 2L 150 – 1981
• Mercury 6 Cyl 3.125 Bore 2L 150 – 1982
• Mercury 6 Cyl 3.125 Bore 2L 150 – 1983
• Mercury 6 Cyl 3.125 Bore 2L 150 – 1984
• Mercury 6 Cyl 3.125 Bore 2L 150 – 1985
• Mercury 6 Cyl 3.375 Bore 2.4L 200 – 1978
• Mercury 6 Cyl 3.375 Bore 2.4L 200 – 1979
• Mercury 6 Cyl 3.375 Bore 2.4L 200 – 1980
• Mercury 6 Cyl 3.375 Bore 2.4L 200 – 1981
• Mercury 6 Cyl 3.375 Bore 2.4L 200 – 1982
• Mercury 6 Cyl 3.375 Chrome Bore 2.4L 200 – 1982
• Mercury 6 Cyl 3.375 Chrome Bore 2.4L 200 – 1983
• Mercury 6 Cyl 3.375 Chrome Bore 2.4L 200 – 1984
• Mercury 6 Cyl 3.375 Chrome Bore 2.4L 200 – 1985
• Mercury 6 Cyl 3.375 Chrome Bore 2.4L 200 – 1986
• Mercury 6 Cyl 3.375 Chrome Bore 2.4L 200 – 1987
• Mercury 6 Cyl 3.375 Chrome Bore 2.4L 200 – 1988

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.

About the Mercury 135-200 HP Outboard Engines

Mercury and Mariner 135-200 HP outboard engines are widely used across recreational and performance boating applications. These engines have long-standing aftermarket support, making quality replacement gaskets, ignition, fuel and powerhead parts important for service and rebuild work.

You May Also Need

Browse related parts for compatible models:

• Oil Seal Crankshaft Mercury / Mariner 30 - 300 Hp 73-14 OEM# 26-20079 – 550-31
• Water Pump Impeller Force / Mercruiser / Mercury 65 - 300 Hp OEM# 18-3017 – 700-205
• Thermostat Mercury 7.5 - 250 Hp 72-06 OEM# 62981 – 775-25
• Thermostat Kit Mercury 2.0 - 3.0 Liter V6 OEM# 75692Q2 – 775-25-2K

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