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Inboard & I/O Engine Parts

Inboard Marine Engine Parts and Accessories

As the largest online dealer of inboard boat parts, Marine Parts Source will help you find the right engine parts you need for any project. We’re here to assist with seasonal maintenance, major repairs and more so you can get back on the water. Use our convenient categories to browse our collection — or if you know the part number you need, enter it into the search bar. From oil and fuel filters to spark plugs, exhaust manifolds, bell housings, starters and alternator belts, we supply boat owners from coast to coast.

You can always count on quality and knowledge when you shop with us. We’re an authorized dealer of the leading OEM and aftermarket performance inboard marine brands, including J&N Electric, Sierra, Arco Marine, Volvo Penta and Crusader. If you have a question, our sales associates have the technical expertise to answer it. Enjoy free ground shipping on qualifying orders so your vessel is ready for adventure.

Inboard & I/O Engine Parts

Items 49-60 of 584

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    25W-40 4-Stroke Marine Engine Oil, 1 quart | Sierra 18-9400-2
    SIERRA-18-9400-2
    Qty In Stock: 185
    Brand: Sierra
    Sierra's Premium Blend engine oil is specially formulated to meet the needs of inboard & stern drive marine engines. Learn More
    MSRP: $14.99 $9.79
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  2. s116368_hose
    Low Permeation Marine Fuel Feed Hose, sold per foot | Sierra 116-368- PER FOOT
    SIERRA-116-368- PER FOOT
    Brand: Sierra

    USCG Type A1-15 fuel hose is primarily used for fuel feed lines of outboard, inboard, and I/O boats. Features an outer layer to prevent permeation and resist UV/weather. Price per foot.

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    Choose option for pricing
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  3. Mercruiser Log Style Exhaust Riser | Sierra 18-1975-1
    Mercruiser Log Style Exhaust Riser | Sierra 18-1975-1
    SIERRA-18-1975-1
    Qty In Stock: 15
    Brand: Sierra
    Replaces 2 piece exhaust adapter & elbow for Mercruiser 120, 140, 2.5L, & 3.0L marine engines from 1982 to 1989. Learn More
    MSRP: $345.59 $205.11
    Add to Wishlist
  4. Sierra 18-5437 1.5 Ohm Ignition Coil
    1.5 Ohm Ignition Coil | Sierra 18-5437
    SIERRA-18-5437
    Qty In Stock: 12
    Brand: Sierra
    Standard 12 volt marine ignition coil is designed to be used with external resistor. Learn More
    MSRP: $54.39 $34.76
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  5. Small Image
    Gasoline Engine Oil Filter | Sierra 18-7876-1
    SIERRA-18-7876-1
    Qty In Stock: 95
    Brand: Sierra
    Sierra oil filter for GM based marine engines with GM long style oil filters. Learn More
    MSRP: $11.09 $8.52
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  6. 3 Position Magneto Off-Run-Start Ignition Switch - Sierra MP41000
    Outboard Ignition Switch with Push to Choke Off/Run/Start - 3 Position | Sierra MP41000
    SIERRA-MP41000
    Qty In Stock: 36
    Brand: Sierra

    Sierra Marine's replacement engine components are manufactured to meet or exceed OEM requirements. This ignition switch provides maximum corrosion protection and features a non-conductive glass-filled polyester housing that helps eliminate potential shorts. It also features an inner seal between the cylinder lock and contact plate. 

    Learn More
    MSRP: $28.99 $17.62
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  7. OMC GM Small Block Exhaust Manifold | Sierra 18-1902
    OMC GM Small Block Exhaust Manifold | Sierra 18-1902
    SIERRA-18-1902
    Qty In Stock: 7
    Brand: Sierra
    Starboard exhaust manifold fits OMC GM 5.0L & 5.7L marine engines with end riser. Learn More
    MSRP: $442.89 $335.55
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  8. Sierra 18-2732-9 Mercruiser Exhaust Water Shutters, Pack of 2
    Mercruiser Exhaust Water Shutters, Pack of 2 | Sierra 18-2732-9
    SIERRA-18-2732-9
    Qty In Stock: 7
    Brand: Sierra

    Mercruiser Exhaust Water Shutters, Pack of 2 

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    MSRP: $94.49 $62.42
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  9. Small Image
    Mercruiser 2 Piece Sea Water Pump | Sierra 18-3600
    SIERRA-18-3600
    Qty In Stock: 4
    Brand: Sierra

    Direct replacement Bravo style raw water pump for Mercruiser V8 marine engines with 2 piece pump housing & V-belt

    Learn More
    MSRP: $714.89 $453.94
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  10. Sierra MP39770 Conventional Marine Ignition Switch Off/Run/Start - 3 Position
    Conventional Marine Ignition Switch Off/Run/Start - 3 Position | Sierra MP39770
    SIERRA-MP39770
    Qty In Stock: 14
    Brand: Sierra

    Sierra Marine's replacement engine components are manufactured to meet or exceed OEM requirements. This ignition switch provides maximum corrosion protection and features a non-conductive glass-filled polyester housing that helps eliminate potential shorts. It also features an inner seal between the cylinder lock and contact plate. 

    Learn More
    MSRP: $28.69 $16.89
    Add to Wishlist
  11. Small Image
    Prestolite V8 Clip Down Distributor Cap | Sierra 18-5369
    SIERRA-18-5369
    Qty In Stock: 29
    Brand: Sierra
    Distributor cap for V8 marine engines with Prestolite distributors using two clips to retain cap to distributor housing. Learn More
    MSRP: $39.89 $28.07
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  12. Small Image
    Cobra SX Engine Coupler | Sierra 18-21752-1
    SIERRA-18-21752-1
    Qty In Stock: 19
    Brand: Sierra
    Aftermarket coupler connects OMC & Volvo Penta GM V6 & V8 engines to stern drives. Learn More
    MSRP: $351.69 $224.91
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Items 49-60 of 584

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