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Mercruiser Internal Engine Parts

7444
guidebook

Parts Selection Guide

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Prop Selection Guide

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      • Sierra 18-2945-9 Drain Screw Gasket (2Pk) Replaces 12-191833
        Starting At: $1.99

        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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      • Restrictor Elbow Gasket, Mercury - Mercruiser 27-863724
        List Price: $12.17
        Starting At: $10.14

        Restrictor Elbow Gasket, Mercury - Mercruiser 27-863724 Fits Center Riser manifolds. Commonly used on all raw water cooled engines. Creates back pressure by restricting the water flow, keeping the manifold full. For: 185, 205, 229 & 262 CID V-6...

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      • Exhaust Manifold Gasket , Mercury - Mercruiser 27-33395
        List Price: $9.68
        Starting At: $8.07

        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: $10.99
        Starting At: $8.49

        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 18-1402 Hydraulic Lifter Replaces 72638
        List Price: $11.99
        Starting At: $8.99

        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: $13.49
        Starting At: $9.99

        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 18-7145 O-Ring Replaces 25-64068
        List Price: $0.98
        Starting At: $0.75

        Sierra 18-7145 O-Ring Sierra high-quality engine parts are designed to meet OEM specifications. I.D.: 0.250" Width: 0.100" Interchangeable with: GLM 81080 Johnson/Evinrude Outboard 333572 Mallory 9-76500 Mercruiser Stern...

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      • Sierra 18-2094 Oil Seal Replaces 26-88416
        List Price: $20.49
        Starting At: $14.49

        Sierra 18-2094 Oil Seal for Mercruiser Stern Drives Sierra engine parts are designed to meet OEM specifications. Fits: 120/140 (1978-82) 165 (1978-81) 260 (1978-82) 485 (1980-82) 898/228 (1978-82) Alpha One/Gen II (1991 & Up) BravoI/II/III...

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      • Sierra 18-3876 Head Gasket Replaces 27-75611001
        List Price: $42.49
        Starting At: $30.99

        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 18-4384 Overhaul Gasket Set
        List Price: $136.99
        Starting At: $95.99

        Mercruiser Cylinder Head and Intake Gasket Set by Sierra For GM 181 (3.0L) CID Engines - S/N 2508261-6229717 (Except 3.0LX) Replaces: GLM 39060 Mallory 9-61101

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      • Sierra 18-0182 Thermostat Gasket Replaces 27-62386001
        List Price: $1.99
        Starting At: $1.49

        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 18-1237 Oil Pan Gasket Replaces 27-13865
        List Price: $46.49
        Starting At: $32.49

        Sierra 18-1237 Oil Pan Gasket for 265 - 400 hp Sierra replacement oil pan gasket for Mercruiser Stern Drives, OMC Stern Drives and Volvo Penta engines. Fits MCM/MIE GM V-8 (305, 350 & 377 cid) engines w/ 1 pc. RM seal (1985 &...

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      • Sierra 18-3937 Piston Rings Replaces 0328506
        List Price: $33.49
        Starting At: $23.49

        Sierra 18-3937 Standard Piston Ring Set Sierra high-quality marine parts are engineered to meet OEM specifications. All pistons are supplied complete with piston rings and wrist pin. Standard size For us on Mercruiser Stern Drive, OMC Inboard, OMC...

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      • Sierra 18-0518 Valve Stem Seal Replaces 26-34217
        List Price: $3.99
        Starting At: $2.99

        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 18-0905 Oil Pan Drain Plug Gasket Replaces 27-49955
        List Price: $2.99
        Starting At: $1.99

        Sierra 18-0905 Oil Pan Drain Plug Gasket Sierra high-quality engine parts are designed to meet OEM specifications. For Mercruiser and Chrysler/Force/US Marine engines. Interchangeable with: Chrysler/Force/US...

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      Mercruiser Gaskets & Seals

      When your Mercruiser outboard needs an overhaul, it can be costly and time consuming. Sometimes the culprit is a blown gasket or seal. These are among the least expensive engine components, yet when compromised, can cause significant damage. Wholesale Marine has compiled a troubleshooting list so that a little routine maintenance can prevent expensive repairs and more carefree voyages and fishing trips!

      The best times to examine your outboard are prior to winter storage and when prepping your boat for the new season. If you do not elect to perform this meticulous work yourself, at least you can know what the process involves and be better aware of the function of various outboard components.

      Check for Leaking Mercruiser Gaskets

      A loss of air compression is usually a sign that the outboard has a cracked or leaking gasket. This must be attended to immediately and not with a bandaid fix to avoid a piston seizure or worse. Here’s why: the normal vacuum in the engine’s lower end draws a fuel/air mixture from the carburetor. It’s sealed off and moved through the transfer ports to the cylinder. A leaky or lean air mixture usually results in a seized piston. To troubleshoot, perform a pressure test.

      1)    Using a plug or rubber gasket, seal off the intake manifold.

      2)    Plug the exhaust port as well.

      3)    Attach an air fitting through the inlet plug or spark plug hole to pressurize the motor.

      4)    Pressurize the motor to 6-9 psi using a hose with an in-line gauge. Do not exceed 9 psi.

      5)    Watch the gauge for 10 minute to confirm that there is no loss of pressure. Pressure loss of any kind is unacceptable.

      6)    If pressure loss is indicated, spray the gasket with WD-40 which creates bubbles. It will also create a leaking sound.

      7)    Replace the leaking gasket. Wholesale Marine has Mercruiser gaskets and gasket kits for every Mercruiser outboard. Use our convenient parts finder to locate the right gaskets for your outboard.

      8)    Other sources of air leaks may be bolt holes and any casting anomalies. Check these as well and replace fitting as necessary.

      If you have boating questions call us for answers! Wholesale Marine’s knowledgeable staff of watercraft enthusiasts will be glad to help. We offer a lowest price guarantee as well as flat rate shipping for $6.99. Join our Loyalty Program and you’ll be able to use the points you accumulate today towards any future purchases. Just give us a call Monday through Friday from 9:00 AM until 6:00 PM EST at (877) 388-2628.