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Mercury Outboard Gearcase & Drive Parts

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Parts Selection Guide

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      • Sierra 18-2945-9 Drain Screw Gasket (2Pk) Replaces 12-191833
        List Price: $2.78
        Starting At: $1.53

        Sierra 18-2945-9 Drain Screw Gasket (2 pack) This Sierra 18-2945 Drain Screw Gasket is used with 3/8-16 drain/fill screw found on all Mercruiser and most Mercury/Mariner O/Bs. This gasket is used in most lower units and sea water pumps. Sold as a 2...

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      • Sierra 18-2244 Drain Screw
        List Price: $2.99
        Starting At: $1.79

        Sierra 18-2244 Drain Screw for Mercury and Mercruiser This Sierra 18-2244 Drain Screw is for use with the following: Mercruiser I,R,MR,Alpha One,TR, TRS & all O/Bs with 3/8-16 non-magnetic gear lube fill or vent screws. Includes: 18-2945...

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      • Sierra 18-2375 Drain Plug Magnet Replaces 22-8M0058389
        List Price: $6.99
        Starting At: $4.46

        Sierra 18-2375 Drain Plug Screw with Magnet for Mercruiser, Mercury, & Chrysler Sierra engine parts are designed to meet OEM Specifications. Fits Mercruiser I, R, MR, Alpha One, TR, and TRS engines. Note: Do not use on #1/R lower units. Also fits...

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      • Sierra 18-4698 Drain Fill Washer Replaces 27-81987
        List Price: $1.99
        Starting At: $1.47

        Sierra 18-4698 Yamaha & Mercury Drain Fill Washer Sierra high-quality engine parts are designed to meet OEM specifications. Use with 18-2374 Magnetic Drain Screw Interchangeable with: Mallory 9-60100 Mercury...

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      • Sierra 18-2646-1 Lower Unit Seal Kit Replaces 26-816575A3
        List Price: $73.99
        Starting At: $32.24

        Mercruiser Alpha I Gen II Lower Unit Seal Kit by Sierra Used On All Mercruiser Alpha I Gen II Lower Units 1991-Up Kit Includes: Sie-18-2599 Face Seal And Tool Sie-18-2564 Water Pump Base To Face Plate Gasket Sie-18-2566 Face Plate To Water Pump Cover...

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      • Sierra 18-2654 Lower Unit Seal Kit Replaces 26-79831A1
        List Price: $68.99
        Starting At: $39.95

        Sierra 18-2654 Mercury Lower Unit Seal Kit Sierra high-quality replacement engine parts are designed to meet OEM specifications. Interchangeable with: GLM 87530 Mallory 9-74202 Mercury Marine 26-79831A1 Kit Includes: (1)...

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      • List Price: $0.99
        Starting At: $0.57

        Sierra 18-7116 O-Ring Replaces 25-62704 I.D.: 0.360" or 9.1mm Width: 0.100" or 2.5mm Interchangeable with: Chrysler/Force/US Marine 25-F24342 25-62704 GLM 81100 Johnson/Evinrude...

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      • Sierra 18-2626 Lower Unit Seal Kit Replaces 26-43035A4
        List Price: $62.49
        Starting At: $39.95

        Sierra 18-2626 Lower Unit Seal Kit for Mercury, Chrysler, Force Outboard Engines Sierra high-quality engine parts are designed to meet OEM specifications. Fits Mercury/Mariner 100/115/125 hp 2-cycle O/B (0B209468 & newer) w/ either a 3 or 6...

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      • List Price: $1.99
        Starting At: $0.66

        Sierra 18-7168 O-Ring Sierra high-quality engine parts are designed to meet OEM specifications. For Johnson/Evinrude Outboards, Mercruiser Stern Drives, Mercury Marine, OMC Stern Drives and Volvo Penta engines. I.D.: 0.370" Width: 0...

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      • Sierra 18-2624 Lower Unit Seal Kit Replaces 26-85090A2
        List Price: $73.99
        Starting At: $50.53

        Sierra 18-2624 Lower Unit Seal Kit for Mercury, Chrysler, Force Sierra high-quality engine parts are designed to meet OEM specifications. Interchangeable with: Chrysler/Force/US Marine 26-85090A2 GLM 87808 Mallory 9-74205 Mercury...

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      • Sierra 18-7173 O-Ring
        List Price: $2.49
        Starting At: $1.50

        Sierra 18-7173 O-Ring I.D.: 1.875" or 47.6mm Width: 0.135" or 3.4mm Fits MCM/MIE GM V-6 & V-8 engine, for thermostat housing with flat cover plate Interchangeable with: Chrysler/Force/US Marine 25-30224 GLM 82250 Johnson/Evinrude Outboard ...

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      • SEI Mercury V6 Outboard Replacement Lower Unit 1.87, 20"
        List Price: $1,104.00
        Starting At: $920.00

        Sterndrive Engineering Mercury V6 Outboard Replacement Lower Unit 1.87:1, 20" Driveshaft Note for purchasing: You must verify your Gear Ratio. Call for application assistance if needed, and have your engine serial number ready when calling...

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      • Sierra 18-1117 Pinion Bearing
        List Price: $47.49
        Starting At: $29.45

        Sierra 18-1117 Lower Unit Pinion Bearing Sierra high-quality engine parts are designed to meet OEM specifications. For use on Chrysler/Force/US Marine, Johnson/Evinrude Outboards, Mercruiser Stern Drives, Mercury Marine and OMC Stern Drives. Fits MR,...

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      • SEI Mercury Outboard 3.0L Replacement Lower Unit 1.75, 20"
        List Price: $1,104.00
        Starting At: $920.00

        Sterndrive Engineering Mercury Outboard 3.0L Replacement Lower Unit 1.75:1, 20" Driveshaft Note for purchasing: You must verify your Gear Ratio. Call for application assistance if needed, and have your engine serial number ready when calling...

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      • Sierra 18-29451-9 Drain Screw Gasket (50Pk)
        List Price: $47.49
        Starting At: $34.45

        Drain Screws Gaskets for Mercruiser, Mercury, OMC (50 pk) Replaces: GLM - 21170 Mallory - 9-60101 Merc - 12-19183-3 Redline - RL2945  

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      • List Price: $1.99
        Starting At: $0.78

        Sierra 18-7158 O-Ring Sierra high-quality engine parts are designed to meet OEM specifications. I.D.: 0.740" Width: 0.100" Interchangeable with: GLM 81160 Johnson/Evinrude Outboard 309731 310585 Mallory 9-76543 Mercruiser...

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      • SEI Mercury V6 Outboard Replacement Lower Unit 1.87, 25"
        List Price: $1,103.99
        Starting At: $919.99

        Sterndrive Engineering Mercury V6 Outboard Replacement Lower Unit 1.87:1, 25" Driveshaft Note for purchasing: You must verify your Gear Ratio. Call for application assistance if needed, and have your engine serial number ready when calling...

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      Mercury Outboard Gear Cases are in stock. This is your online destination for marine engine parts.