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Mercury Outboard Internal Engine Parts

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Parts Selection Guide

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      • Sierra 18-2026 Oil Seal Replaces 26-16977
        List Price: $12.77
        Starting At: $8.94

        Sierra 18-2026 Seal for Mercruiser, OMC, Johnson and Evinrude Drive Systems Sierra replacement Line Cutter Seal. Shaft Size: .875" O.D. 1.250" Width 0.188" Use with: 18-2093 Oil Seal Interchangeable with: GLM 85040 Johnson/Evinrude...

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      • Sierra 18-3921 Piston Rings Replaces 39-93481A12
        List Price: $37.35
        Starting At: $28.39

        Sierra 18-3921 Mercury Standard Piston Rings Sierra high-quality engine parts are designed to meet OEM specifications. Bore Size: 3.125 / Standard Interchangeable with: GLM 14240 Mallory 9-54233 Mercury...

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      • Sierra 18-3924 Piston Rings
        List Price: $35.65
        Starting At: $24.95

        Piston Rings - Special Order est. 10 Days

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      • 25-32546
        List Price: $3.10
        Starting At: $2.95

        Lower End Cap O Ring , Mercury - Mercruiser 25-32546 Fits: 30, 40, 50, 60, 65, 70, 75, 80, 85, 90, 115, 140, 150 hp engines Replaces: GLM 80420 Mallory 9-76546 Sierra 18-7161

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      • Sierra 18-3966 Piston Rings
        List Price: $43.20
        Starting At: $30.24

        Sierra 18-3966 Mercury Piston Rings Sierra high-quality piston rings for Mercury Marine engines. Sierra engine parts are backed by Sierra's unmatched manufacturer's warranty. Bore Size: 2.565 / Standard Interchangeable...

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      • List Price: $37.54
        Starting At: $26.28

        Sierra 18-3982 Standard Piston Rings For Mercury Outboards Sierra high-quality engine parts are designed to meet OEM specifications. 18-3982 Piston Rings are for Mercury and Mariner Crossflow and Inline Outboard engines Bore Size: 3.500 /...

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      • Sierra 18-3871 Head Gasket
        List Price: $50.84
        Starting At: $35.59

        Sierra 18-3871 Head Gasket For Mercury 175, VR4, Mag II Interchangeable with: GLM 35890 Mallory 9-63856 Mercury Marine 27-18786-1 27-18786T 27-187863

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      • List Price: $92.51
        Starting At: $85.11

        Sierra 18-4014 Piston Kit Sierra replacement piston kit for Mercury Marine engines. Interchangeable with: GLM 14155 Mallory 9-53240 Mercury Marine 765-7446A11

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      • Sierra 18-0515 Oil Seal
        List Price: $9.55
        Starting At: $7.26

        Oil Seal - Special Order est. 10 Days

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      • Sierra 18-0879 Adapter Plate Gasket
        List Price: $6.41
        Starting At: $4.87

        Sierra 18-0879 Adapter Plate Gasket Sierra replacement adapter plate gasket for use on Mercury/Mariner Outboard Engines. Interchangeable with: GLM 31400 Mallory 9-60042 Mercury Marine 27-385011 27-38501 27-37724

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      • Sierra 18-3922 Piston Rings
        List Price: $45.41
        Starting At: $31.79

        Sierra 18-3922 Piston Rings Sierra high-quality engine parts are designed to meet OEM specifications. Bore Size: 3.125 / .015 Interchangeable with: GLM 14250 Mercury Marine 39-78918A4 Wiseco 3145KD

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      • Sierra 18-4623 Piston Kit
        List Price: $184.89
        Starting At: $129.42

        Sierra 18-4623 Piston Kit Sierra replacement piston kit for Mercury Marine engines. Bore Size: 3.375 / Standard Interchangeable with: GLM 14660 Mallory 9-53246 Mercury Marine 777-815965T4 777-815965A4

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      • Sierra 18-3872 Head Gasket
        List Price: $57.43
        Starting At: $40.20

        Sierra 18-3872 Head Gasket For Mercury 200 & 225 Hp Interchangeable with: GLM 35900 Mallory 9-63852 Mercury Marine 27-41245-1 27-41244T02 27-41245 27-41244 27-77671 27-96541 27-90279 27-412452

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      • List Price: $3.75
        Starting At: $2.85

        Sierra 18-7167 O-Ring 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 Drive engines. I.D.: 3...

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      • Sierra 18-4637 Piston Kit
        List Price: $240.34
        Starting At: $168.24

        Sierra 18-4637 Piston Kit Sierra replacement piston kit for Mercury Marine and Mercury Sport Jet engines. Bore Size: 3.500 / .015 Port Interchangeable with: GLM 14430 Mercury Marine 785-9737A10

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      • Sierra 18-3918 Piston Rings
        List Price: $50.28
        Starting At: $35.20

        Sierra 18-3918 Mercury Marine Piston Rings Sierra high-quality engine parts are designed to meet OEM specifications. Bore Size: 2.875 / Standard For 2 ring pistons Interchangeable with: GLM 14210 Mercury...

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      • Sierra 18-0372 Cylinder Block Cover Gasket
        List Price: $9.67
        Starting At: $7.35

        Sierra Cylinder Block Gasket Special Order est. 10 Days For use on 20 HP Mercury/Mariner engines Replaces:  27-78410

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      • Sierra 18-0523 Oil Seal
        List Price: $18.83
        Starting At: $13.18

        Sierra 18-0523 Oil Seal O.D.: 2.132" Shaft Size: 1.640" Width: 0.282" Interchangeable with: GLM 85090 Mercruiser Stern Drive 26-43993 Mercury Marine 26-43993

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      • Sierra 18-2741 Exhaust Cover Plate Gasket
        List Price: $12.65
        Starting At: $8.86

        Sierra 18-2741 Exhaust Cover Plate Gasket For use on Mercury/Mariner Outboard Engines:  65 Jet, 75hp 3 cyl., 90hp 3cyl Interchangeable with: GLM 37650 Mercury...

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      Mercury Outboard Powerhead parts for lower boat engines.