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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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    1.5 Ohm Ignition Coil | Sierra 18-5433
    SIERRA-18-5433
    Qty In Stock: 23
    Brand: Sierra
    Standard 12 volt marine ignition coil is designed to be used with external resistor. Learn More
    MSRP: $57.69 $36.84
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  2. GM Small Block Exhaust Manifold Gasket Set | Sierra 18-0604
    GM Small Block Exhaust Manifold Gasket Set | Sierra 18-0604
    SIERRA-18-0604
    Qty In Stock: 3
    Brand: Sierra
    Complete exhaust gasket set for a pair of Sierra 18-1997-1 GM small block center rise manifolds. Learn More
    MSRP: $39.99 $26.10
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  3. Small Image
    Prestolite Rotor | Sierra 18-5403
    SIERRA-18-5403
    Qty In Stock: 8
    Brand: Sierra

    Rotor fits V6 & V8 marine engines with Prestolite screw down cap distributors

    Learn More
    MSRP: $9.69 $9.35
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  4. Sierra MP40970-1 Emergency Engine Cut-Off Switch & Lanyard
    Emergency Engine Cut-Off Switch & Lanyard | Sierra MP40970-1
    SIERRA-MP40970-1
    Qty In Stock: 16
    Brand: Sierra

    Engine cut-off switch kills engine ignition when the lanyard is pulled. Will provide a “normally open” or “normally closed” circuit.

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    MSRP: $30.59 $20.90
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  5. 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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  6. Small Image
    GM Big Block Exhaust Manifold Gasket Set | Sierra 18-4348
    SIERRA-18-4348
    Qty In Stock: 9
    Brand: Sierra
    Gasket kit includes 2 manifold to head gaskets & 2 center rise elbow restrictor gaskets for a pair of Mercruiser 7.4L & 8.2L center rise exhaust manifolds. Learn More
    MSRP: $51.59 $32.53
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  7. s1163551120_lg
    1-1/2 inch Type A2 Fuel Fill Hose, 50 foot | Sierra 116-355-1120
    SIERRA-116-355-1120S
    Qty In Stock: 15
    Brand: Sierra
    Primarily used for gas or diesel fuel fill lines in pleasure boats. 1 1/2 in. inside diameter. Sold as 50 continuous feet. Learn More
    MSRP: $574.50 $513.74
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  8. 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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  9. Sierra 18-7632-1 Idle Air Control Motor
    Idle Air Control Motor | Sierra 18-7632-1
    SIERRA-18-7632-1
    Qty In Stock: 10
    Brand: Sierra
    Actuator valve used to control the engine's idle speed. Learn More
    MSRP: $136.19 $89.48
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  10. Sierra 18-7288-1 Mercruiser GM Big Block Fuel Pump
    Fuel Pump Kit | Sierra 18-7288-1
    SIERRA-18-7288-1
    Qty In Stock: 13
    Brand: Sierra

    Carter style fuel pump update kit for Mercruiser 7.4 liter 454 engine models with mechanical fuel pump

    Learn More
    MSRP: $196.69 $143.57
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  11. Small Image
    21 Micron Long Fuel Water Separator Filter | Sierra 18-7845
    SIERRA-18-7845
    Qty In Stock: 250
    Brand: Sierra
    Replacement spin-on fuel filter fits many Mercury & Mercruiser marine engines to remove contaminants & water from incoming fuel. Learn More
    MSRP: $13.99 $11.22
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  12. 3/4 inch Exoflex Exhaust/Water Hose, sold by foot | Sierra 116-254-0340-1
    3/4 inch Exoflex Exhaust/Water Hose, sold by foot | Sierra 116-254-0340-1
    SIERRA-116-254-0340-1
    Qty In Stock: 40
    Features a corrugated exterior and is internally reinforced by wire to prevent hose from collapsing. Primarily used for connections in marine wet exhaust and engine water circulation applications, especially where significant bends of hose are required. Designed to resist heat, exhaust gases, ozone, antifreeze, and saltwater Learn More
    MSRP: $15.00 $12.50
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Items 49-60 of 584

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