Mercruiser Internal Engine Parts

guidebook

Parts Selection Guide

Find the parts you need

Clear
  • 1) Engine Manufacturer:
  • 2) Part Type:
  • 3) Select Model:
      • 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...

        Add to Cart
      • Magnetic Oil Plug Drain Kit Bottom, Mercury - Mercruiser 22-8M0058389
        List Price: $6.85
        Starting At: $5.71

        Magnetic Oil Plug Drain Kit Bottom, Mercury - Mercruiser 22-8M0058389 All MC-1, Alpha 1, Gen II, TR & TRS Replaces: Mercury 22-67892A06 GLM 21731 Mallory 9-72651 Redline RL2375 Pro Marine 64892 Sierra 18-2375

        Add to Cart
      • 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  

        Add to Cart
      • 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

        Add to Cart
      • Restrictor Elbow Gasket, Mercury - Mercruiser 27-863724
        List Price: $11.99
        Starting At: $9.93

        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...

        Add to Cart
      • 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...

        Add to Cart
      • Sierra 1525607 Aviation Gasket Sealant
        List Price: $14.99
        Starting At: $14.23

        Sierra 1525607 Loctite Aviation Gasket Sealant (Gasket Sealing Compound)A Slow Drying, Non-Hardening Brush Top Sealant,Gasoline,Oil,And Grease Resistant Key Features: Slow Drying Non hardening brush top sealant Gasoline, oil, and grease...

        Add to Cart
      • 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...

        Add to Cart
      • 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...

        Add to Cart
      • Sierra 18-2944 Seal Ring Gasket Replaces 26-455771
        List Price: $2.99
        Starting At: $1.66

        Sierra 18-2944 Mercruiser Quad Ring Fits between upper and lower units on all Alpha and Bravo drives. Fits R, MR, Alpha & BRavo drives. Use with: 18-2945 Drain Screw Gasket 18-29451-9 Drain Screw Gasket 18-2945-9 Drain Screw...

        Add to Cart
      • Sierra 18-2094 Oil Seal Replaces 26-88416
        List Price: $18.49
        Starting At: $13.48

        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...

        Add to Cart
      • 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...

        Add to Cart
      • Sierra 18-7145 O-Ring Replaces 25-64068
        List Price: $1.49
        Starting At: $0.67

        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...

        Add to Cart
      • 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...

        Add to Cart
      • 27-33179-2
        List Price: $2.10
        Starting At: $2.00

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

        Add to Cart
      • 27-98823-1
        List Price: $2.20
        Starting At: $2.09

        Power Trim Hose Connection Gasket, Mercury - Mercruiser 27-98823-1 For Mercruiser Alpha Stern Drives 1983-present and all Bravo Drives. Replaces: GLM 32500 Redline RL0388 Sterndrive 9F-116-18 Sierra 18-0388

        Add to Cart
      • 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...

        Add to Cart
      • Sierra 18-4384 Overhaul Gasket Set
        List Price: $134.49
        Starting At: $93.99

        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

        Add to Cart
      • Sierra 18-0905 Oil Pan Drain Plug Gasket Replaces 27-49955
        List Price: $2.99
        Starting At: $2.04

        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...

        Add to Cart

      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.