{"product_id":"333008-air-box-gasket-for-johnson-evinrude-jlm-marine","title":"333008 Air Box Gasket for Johnson Evinrude | JLM Marine","description":"\u003ch2\u003eAir Box Gasket for Johnson Evinrude 3 Cyl 50 60 70 HP – OEM 333008\u003c\/h2\u003e\n\n\u003cp\u003eThis \u003cstrong\u003eAir Silencer Tank Cap Gasket\u003c\/strong\u003e is designed for \u003cstrong\u003eJohnson Evinrude OMC 3-cylinder outboards rated at 50HP, 60HP, and 70HP\u003c\/strong\u003e. It ensures a proper seal for the air box assembly, preventing air leaks and maintaining optimal engine performance.\u003c\/p\u003e\n\n\u003cp\u003eThis aftermarket gasket directly replaces OEM part numbers \u003cstrong\u003e333008\u003c\/strong\u003e, \u003cstrong\u003e321793\u003c\/strong\u003e, and \u003cstrong\u003e777758\u003c\/strong\u003e, as well as aftermarket equivalents from Sierra and GLM Marine.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eFits Johnson Evinrude OMC 3-cylinder 50–70 HP outboards\u003c\/li\u003e\n  \u003cli\u003eDirect replacement for air silencer tank cap\u003c\/li\u003e\n  \u003cli\u003ePrecision-cut for reliable sealing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Cross-Reference\u003c\/h2\u003e\n\n\u003cp\u003eUse this table to confirm equivalent part numbers across OEM and aftermarket brands.\u003c\/p\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eBrand\u003c\/th\u003e\n      \u003cth\u003ePart Number\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eJohnson Evinrude OMC\u003c\/td\u003e\n      \u003ctd\u003e333008\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eJohnson Evinrude OMC\u003c\/td\u003e\n      \u003ctd\u003e321793\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eJohnson Evinrude OMC\u003c\/td\u003e\n      \u003ctd\u003e777758\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eSierra\u003c\/td\u003e\n      \u003ctd\u003e18-0975\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eGLM Marine\u003c\/td\u003e\n      \u003ctd\u003e34402\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eCompatible Engine Models\u003c\/h2\u003e\n\n\u003cp\u003eConfirm your engine model\/year in the table below. For Johnson\/Evinrude owners, here's a guide to help you identify your engine's serial\/model: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/johnson-serial-number-guide\" rel=\"nofollow noopener\" target=\"_blank\"\u003eJohnson\/Evinrude Serial Number Guide\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eBrand\u003c\/th\u003e\n      \u003cth\u003eModel\u003c\/th\u003e\n      \u003cth\u003eRated HP\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eJohnson Evinrude OMC\u003c\/td\u003e\n      \u003ctd\u003e3 Cyl Outboards\u003c\/td\u003e\n      \u003ctd\u003e50HP\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eJohnson Evinrude OMC\u003c\/td\u003e\n      \u003ctd\u003e3 Cyl Outboards\u003c\/td\u003e\n      \u003ctd\u003e60HP\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eJohnson Evinrude OMC\u003c\/td\u003e\n      \u003ctd\u003e3 Cyl Outboards\u003c\/td\u003e\n      \u003ctd\u003e70HP\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eSpecification\u003c\/th\u003e\n      \u003cth\u003eValue\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eOEM Part Number\u003c\/td\u003e\n      \u003ctd\u003e333008\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eApplication\u003c\/td\u003e\n      \u003ctd\u003eAir Silencer Tank Cap\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eEngine Configuration\u003c\/td\u003e\n      \u003ctd\u003e3 Cylinder\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eCompatible Horsepower\u003c\/td\u003e\n      \u003ctd\u003e50HP, 60HP, 70HP\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\n\u003cp\u003eThis package includes:\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\u003cspan style=\"color:red;\"\u003e1× Air Silencer Tank Cap Gasket\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\n\u003col\u003e\n  \u003cli\u003eDisconnect the battery and ensure the engine is cool before beginning work.\u003c\/li\u003e\n  \u003cli\u003eLocate the air silencer tank cap on your outboard engine.\u003c\/li\u003e\n  \u003cli\u003eRemove the cap by unscrewing or unclipping it from the air box assembly.\u003c\/li\u003e\n  \u003cli\u003eCarefully peel off the old gasket from both the cap and mounting surface. Clean both surfaces thoroughly to remove any residue or debris.\u003c\/li\u003e\n  \u003cli\u003ePosition the new gasket onto the air silencer tank cap, ensuring proper alignment with all mounting holes.\u003c\/li\u003e\n  \u003cli\u003eReinstall the cap onto the air box assembly, pressing firmly to seat the gasket evenly.\u003c\/li\u003e\n  \u003cli\u003eSecure the cap with screws or clips, tightening evenly to manufacturer specifications. Do not overtighten, as this may damage the gasket.\u003c\/li\u003e\n  \u003cli\u003eReconnect the battery and start the engine to verify proper sealing and operation.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How do I confirm this gasket fits my Johnson Evinrude engine?\u003c\/strong\u003e\u003cbr\u003e\nA: Check that your outboard is a 3-cylinder model rated at 50HP, 60HP, or 70HP. Cross-reference your current gasket with OEM part numbers 333008, 321793, or 777758 to ensure compatibility.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What are the signs that my air box gasket needs replacement?\u003c\/strong\u003e\u003cbr\u003e\nA: Common symptoms include air leaks around the air silencer cap, rough idling, loss of power, or difficulty starting. Visible cracks, brittleness, or deformation of the old gasket also indicate it's time for replacement.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace the air box gasket?\u003c\/strong\u003e\u003cbr\u003e\nA: Replace the gasket whenever you service the air box assembly or notice signs of wear. Regular inspection during annual maintenance is recommended, especially if you operate in harsh marine environments.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I reuse the old gasket if it looks intact?\u003c\/strong\u003e\u003cbr\u003e\nA: No, once a gasket is compressed and conforms to surfaces, reusing it may result in improper sealing. Always install a new gasket during reassembly to ensure a reliable seal.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: OEM vs. Aftermarket?\u003c\/strong\u003e\u003cbr\u003e\nA: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How fast do you ship and how much does it cost?\u003c\/strong\u003e\u003cbr\u003e\nA: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is your warranty and return policy?\u003c\/strong\u003e\u003cbr\u003e\nA: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused \u0026amp; in original condition); please see our policy page or reach out for instructions.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003eVerify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.\u003c\/li\u003e\n  \u003cli\u003eThis product is an aftermarket replacement part and is not an OEM component.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended to ensure safety and optimal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuality Assured:\u003c\/strong\u003e As a trusted manufacturer for over 20 years, we supply top marine brands globally.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Global Shipping:\u003c\/strong\u003e Free delivery worldwide in 5–15 days.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDirect from Manufacturer:\u003c\/strong\u003e Competitive pricing without compromising quality.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":51981000966457,"sku":"23GT341","price":11.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/12_80d561a5-3ccc-49a3-ac63-9272b849d2bc.jpg?v=1772414207","url":"https:\/\/jlmmarine.com\/products\/333008-air-box-gasket-for-johnson-evinrude-jlm-marine","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}