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Mercruiser Internal Engine Parts


Parts Selection Guide

Find the parts you need

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Prop Selection Guide

Find the right prop for your boat

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      • Sierra 18-2945-9 Drain Screw Gasket (2Pk) Replaces 12-191833

        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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      • Exhaust Manifold Gasket , Mercury - Mercruiser 27-33395

        Mercury - Mercruiser 27-33395 Exhaust Manifold Gasket 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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      • Restrictor Elbow Gasket, Mercury - Mercruiser 27-863724

        Mercury - Mercruiser 27-863724 Restrictor Elbow Gasket 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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      • Sierra 18-0549 Plug Off Cap Replaces 3852476

        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

        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...

        Out of stock

      • Sierra 18-2917 Thermostat Gasket Replaces 27-530451

        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  

        Out of stock

      • Sierra 18-0347 Valve Cover Gasket Replaces 27-851040

        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 18-2946 Head Gasket Replaces 27-52364

        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 ...

        Out of stock

      • 27-33179-2

        Mercury - Mercruiser 27-8M0214924 Thermostat Housing Gasket Fits MCM/MIE GM 4 Cylinder, V-6, and V-8 engines. For thermostat housing with flat cover plate Supercedes from 27-33179-2 Replaces: Mercury 27-53045, 27-53045...

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      • Sierra 18-2094 Oil Seal Replaces 26-88416

        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

        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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      Mercruiser OEM Engine Parts Finder

      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 band aid 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.