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guidebook

Parts Selection Guide

Find the parts you need

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Prop Selection Guide

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Mercruiser Head Gaskets

Mercruiser Valve Cover Gaskets

Mercruiser Crankshaft Seals

Mercruiser Engine Gasket Sets

Mercruiser Cylinder Heads

Mercruiser Oil Pans

Mercruiser Oil Pan Gaskets

Mercruiser Main & Rod Bearings

Mercruiser Pistons & Rings

Mercruiser Hydraulic Lifters

Mercruiser 3.7L Parts & Gaskets

      Mercruiser Internal Engine Parts

      • Sierra 18-7143 O-Ring
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        Sierra 18-7143 O-Ring

        $0.35
        $0.27

        Sierra 18-7143 O-Ring Sierra high-quality engine parts are designed to meet OEM specifications. I.D.: 1.310" Width: 0.100" Interchangeable with: GLM 81250 Johnson/Evinrude Outboard 331188 Mallory 9-76537 Mercruiser Stern...

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      • Sierra 18-4024 Valve Stem Seal
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        Sierra 18-4024 Valve Stem Seal

        $3.49
        $2.99

        Sierra 18-4024 Intake Valve Stem Seal for 4.3L/5.0L/5.7L Sierra high-quality engine parts are designed to meet OEM specifications. For Mercruiser, OMC, and Volvo Penta applications. For: Chevy 4.3L/5.0L/5.7L Interchangeable...

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      • Sierra 18-4389 Intake Manifold Gasket Set
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        Sierra 18-4389 Intake Manifold Gasket Set

        $151.99
        $106.49

        Sierra 18-4389 Mercruiser Intake Manifold Gasket Set Sierra high-quality engine parts are designed to meet OEM specifications. Fits MCM GM In-Line 6 cyl. Interchangeable with: GLM 39660 Mallory 9-61212 Mercruiser Stern...

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      • Sierra 18-0185 Remote Oil Seal Replaces 27-91892
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        Sierra 18-0185 Remote Oil Seal Replaces 27-91892

        $8.49
        $5.99

        Sierra 18-0185 Remote Oil Seal Sierra 18-0185 Remote Oil Seal is for use on most Mercruiser remote oil filter applications. All Sierra aftermarket parts are manufactured to meet or exceed OEM requirements. Interchangeable...

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      • Sierra 18-1211 Rear Main Seal Replaces 26-814622
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        Sierra 18-1211 Rear Main Seal Replaces 26-814622

        $71.99
        $49.99

        Sierra 18-1211 Two Piece Rear Main Seal for Mercruiser, OMC, Volvo Sierra two piece rear main seal for Most GM Based Marine Engines. For 120/2.5L (s/n 2786857 & up), 140/3.0L & LX (s/n 6229718 & up) For 150/160/165/200 (I/L-6) (s/n...

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      • Sierra 18-4394 Exhaust Manifold Gasket Set
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        Sierra 18-4394 Exhaust Manifold Gasket Set

        $30.99
        $21.49

        Exhaust Manifold Gasket Set - by Sierra Special Order est. 10 Days For: GM 350 (5.7L) CID Eng; 250 HP S/N 4768000-4908849 255 HP S/N 5195909 & UP Contains: 4 18-2832 Manifold End Cap Gasket (OEM 27-48043) 4...

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      • Mercruiser 23-85701 Connecting Rod Bearing-Std
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        Mercruiser 23-85701 Connecting Rod Bearing-Std

        $14.99
        $12.99

        Mercruiser 23-85701 Connecting Rod Bearing - Standard Size Genuine OEM Mercury-Mercruiser part. Mercruiser replacement connecting rod bearing. Fits: MCM 140/3.0L/LX (s/n 0L605541 and below) & GM V‑8 (305, 327 & 350...

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      • Sierra 18-0346 Valve Cover Gasket
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        Sierra 18-0346 Valve Cover Gasket

        $12.99
        $9.99

        Sierra 18-0346 Valve Cover Gasket for 4.1L and 6 cylinder Engines For Mercruiser, OMC GM 250 CID (4.1L), 160/165/200 (6 cyl.). Interchangeable with: GLM 35070 Mallory 9-61318 Mercruiser Stern Drive 27-49936 27-34042 OMC Stern...

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      • Sierra 18-3887 Head Gasket Replaces 27-879150141
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        Sierra 18-3887 Head Gasket Replaces 27-879150141

        $78.99
        $54.99

        Sierra 18-3887 Head Gasket for 7.4L Crusader, Mercruiser, OMC, and Volvo Engines Sierra high-quality engine parts are designed to meet OEM specifications.  For 7.4L 454 CID Gen V and VI (1992 & up) Interchangeable...

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      • Sierra 18-0525 Oil Seal Replaces 26-45587
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        Sierra 18-0525 Oil Seal Replaces 26-45587

        $8.99
        $6.49

        Sierra 18-0525 Mercury Mercruiser Oil Seal For Mercury and Mercruiser Marine Engines. O.D.: 0.628" Shaft Size: 0.390" Width: 0.124" Interchangeable with: GLM 85380 Mercruiser Stern Drive 26-41374 26-45587

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      • Sierra 18-3881 Head Gasket
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        Sierra 18-3881 Head Gasket

        $83.99
        $58.49

        Sierra 18-3881 Head Gasket for 4.1L GM 6 cyl Engines Sierra high-quality engine parts are designed to meet OEM specifications. Fits Mercruiser and OMC Stern Drives. For GM 250 (4.1L) CID (6 cyl) engines Interchangeable...

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      • Sierra 18-0903 Water Pump Gasket
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        Sierra 18-0903 Water Pump Gasket

        $2.49
        $1.99

        Sierra 18-0903 Water Pump Gasket Sierra high-quality engine parts are designed to meet OEM specifications. For use on Mercruiser Stern Drives, OMC Stern Drives, and Volvo Penta engines. Fits GM V-8 (454 & 502 cid) engines. Interchangeable...

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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.