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OMC Internal Engine 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 18-4248 Drain/Fill Plug Washer Replaces 0311598
        List Price: $0.89
        Now: $0.67

        Sierra 18-4248 Drain/Fill Plug Washer for Johnson, Evinrude, OMC Sierra high-quality engine parts are designed to meet OEM specifications. Plastic plug used with Drain Screw 18-2387. Interchangeable with: Johnson/Evinrude...

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      • Sierra 18-2613 Outdrive Gasket Set Replaces 0508105
        List Price: $7.99
        Starting At: $4.50

        Sierra 18-2613 OMC Cobra Sterndrive Outdrive Gasket Set For Use On All OMC "Clutch Dog" Cobra Sterndrives 1986 - 1993. Not For Use On King Cobra Sterndrives. Kit Includes: (1) 18-2918 Outdrive Gasket (1) 18-2996 Outdrive Seal (2) 18-7153...

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      • Sierra 18-2917 Thermostat Gasket Replaces 27-530451
        List Price: $2.99
        Starting At: $1.61

        Thermostat housing gasket for Mercruiser, OMC, Volvo Gasket has brass grounding rivets Replaces: GLM - 35060 Merc - 27-33918, 27-53045-1 Mallory - 9-60007 OMC - 0312797 Volvo - 835417  

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      • Exhaust Manifold Gasket , Mercury - Mercruiser 27-33395
        List Price: $9.52
        Starting At: $7.93

        Exhaust Manifold Gasket , Mercury - Mercruiser 27-33395 Fits MCM/MIE GM V-8 (283, 305, 350,  and 377 CID) engines Replaces: GLM 31100 Mallory 9-61401 Felpro 17420 OMC 3852468 Redline RL0872 Sierra 18-0872

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      • Sierra 18-0549 Plug Off Cap Replaces 3852476
        List Price: $10.98
        Starting At: $7.84

        Sierra 18-0549 Plug Off Cap 1" I.D. Sierra high quality engine parts are designed to meet OEM specifications. For V8 Stern Drives and Inboards 1977 - present. Interchangeable with: GLM 22290 Johnson/Evinrude...

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      • Sierra 18-2946 Head Gasket Replaces 27-52364
        List Price: $29.99
        Starting At: $20.99

        Head Gasket for 3.0L Mercruiser, Volvo, OMC Replaces: Mercruiser OEM 27-52364, 27-810841, F15000204 OMC and Volvo OEM 3853336, 908611, 913274, 914814 Chriscraft OEM 16.50-00204 Johnson/Evinrude Outboard 908611, 0914812, 3853336 Mallory 9-63700 ...

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      • Sierra 18-1402 Hydraulic Lifter Replaces 72638
        List Price: $8.99
        Starting At: $7.72

        Sierra 18-1402 Hydraulic Lifter Sierra high-quality replacement parts are designed to meet OEM specifications. For OMC & Volvo 3.0L/181 CID. Fits MCM/MIE GM 4 cyl. V-6 & V-8 (283, 305, 327, 350, 454 & 482 cid) engines. Interchangeable...

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      • Sierra 18-0347 Valve Cover Gasket Replaces 27-851040
        List Price: $11.99
        Starting At: $7.84

        Sierra 18-0347 Valve Cover Gasket for 2.5 & 3.0L Mercruiser, Volvo, OMC Sierra high-quality replacement engine parts are designed to meet OEM specifications. For GM 153 & 181 CID (2.5L & 3.0L) Interchangeable...

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      • Sierra 18-0550 Plug Off Cap Replaces 0764799
        List Price: $10.49
        Starting At: $6.95

        Sierra 18-0550 OMC Exhaust Manifold Plug Off Cap 1.25" I.D. Sierra high-quality engine parts are designed to meet OEM specifications. For V8 Stern Drives and Inboards 1977 - present. I.D.: 1-1/4" Interchangeable...

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      • Sierra 18-3876 Head Gasket Replaces 27-75611001
        List Price: $41.49
        Starting At: $28.99

        Sierra 18-3876 Head Gasket for 5.0 & 5.7L OMC, Volvo, Mercruiser Sierra high-quality engine parts are designed to meet OEM specifications. Fits MCM/MIE GM V-8 (283, 305, 327, 350 & 377 cid) engines. Fits: 305 (5.0L)/350 (5.7L) CID...

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      • Sierra 18-0182 Thermostat Gasket Replaces 27-62386001
        List Price: $1.99
        Starting At: $1.18

        Sierra 18-0182 Thermostat Gasket Thermostat Gasket for Johnson/Evinrude Outboards, Mercury engines, Mercury Race Outboards and Mercury Sport Jet engines. Interchangeable with: GLM 30610 Johnson/Evinrude...

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      • Sierra 18-0518 Valve Stem Seal Replaces 26-34217
        List Price: $1.99
        Starting At: $1.02

        Sierra 18-0518 Valve Stem Seal for Mercruiser, OMC, Volvo For most inline 4 and 6 cylinder GM (Early) and 305-350 CID GM Engines. O.D.: 0.394" Shaft Size: 0.282" Width: 0.083" Interchangeable with: Johnson/Evinrude...

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      • Sierra 18-0868 Intake Manifold Gasket Set Replaces 27-17145
        List Price: $25.99
        Starting At: $18.38

        Sierra 18-0868 Intake Manifold Gasket Set Sierra replacement intake manifold gasket set for OMC Stern Drives, Mercruiser Stern Drives, and Volvo Penta engines. For OMC 5.7L 1994, 1996-97 Fits MCM/MIE GM V-8 (305 & 350 cid) engines (1975 &...

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      • Sierra 18-2873 Water Jacket Gasket Replaces 0318335
        List Price: $3.99
        Starting At: $2.43

        Sierra 18-2873 Water Jacket Gasket for Johnson, Evinrude Outboards Sierra high-quality engine parts are designed to meet OEM specifications and are backed by Sierra's unmatched manufacturer's warranty. Interchangeable...

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      • Sierra 18-3879 Head Gasket Replaces 27-879150140
        List Price: $41.49
        Starting At: $26.45

        Sierra 18-3879 Head Gasket Sierra replacement head gasket for Mercruiser Stern Drives, OMC Stern Drives, and Volvo Penta engines. Fits: GM 262 (4.3L) CID Engines Interchangeable with: Crusader 33408 GLM 36100 Johnson/Evinrude...

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      OMC Sterndrive Gaskets and Seals are here and in stock.