{"product_id":"quickmarine-393659-thermostat-seals-kit-for-johnson-evinrude-5-235-hp-outboards-sierra-18-3543-replacement","title":"QuickMarine 393659 Thermostat \u0026 Seals Kit for Johnson Evinrude 5-235 HP Outboards | Sierra 18-3543 Replacement","description":"\u003cdiv\u003e\n  \u003ch2\u003eOverview\u003c\/h2\u003e\n  \u003cp\u003eThe QuickMarine 393659 Thermostat \u0026amp; Seals Kit is designed to refresh aging cooling components on a wide range of Johnson and Evinrude outboards. Built with a stainless steel thermostat body and two durable seals, this kit blends practical reliability with a clean, straightforward installation. Expect a tactile, metal-to-metal feel when handling the parts, and a confident fit when you place the seals against the housing. While it can’t guarantee specific results in every engine, this kit is positioned to support steadier temperature behavior and easier maintenance checks for the seasoned boat owner.\u003c\/p\u003e\n  \u003cp\u003eDesigned for versatility, the kit targets engines from small 5 HP units up to robust 235 HP, including Jet models in the mid-to-high horsepower range. You can find detailed fitment information in the listing below, helping you verify compatibility with your exact model before installation.\u003c\/p\u003e\n  \u003ch3\u003eWhat’s inside\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eStainless steel thermostat assembly with two gaskets for a secure seal\u003c\/li\u003e\n    \u003cli\u003eTwo high-quality seals designed to resist wear and keep cooling paths clear\u003c\/li\u003e\n    \u003cli\u003eCross-compatibility with common OEM references to simplify sourcing\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003ch3\u003eKey specifications and benefits\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eThermostat temperature rated at 60°C (143°F) helps maintain intended engine operating range\u003c\/li\u003e\n    \u003cli\u003eMade from durable stainless steel for long-lasting performance in marine environments\u003c\/li\u003e\n    \u003cli\u003eIncludes two gaskets to support a proper seal during cooling cycles\u003c\/li\u003e\n    \u003cli\u003eReplaces widely used cross-reference Sierra 18-3543 and similar aftermarket parts\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003ch3\u003eCompatibility \u0026amp; OEM references\u003c\/h3\u003e\n  \u003cp\u003eThe kit references multiple OEM numbers to aid compatibility checks. Typical cross-compatibility includes: 377148, 0377148, 377612, 0377612, 378065, 0378065, 393659, 0393659, 434841, 0434841, 437414, 0437414, 508626, 0508626, 777260, 0777260, 5005440, 8330720, 59434841. When in doubt, compare these numbers to your current thermostat or consult your dealer for confirmation.\u003c\/p\u003e\n  \u003cp\u003eIn practice, users often encounter easier analyzer checks and a more confident disassembly\/reassembly process thanks to clearly labeled parts and a robust stainless steel construction. This kit is a practical option for proactive maintenance or mid-season service, offering a pathway to restored cooling performance without the guesswork of sourcing individual components.\u003c\/p\u003e\n  \u003ch3\u003eInstallation tips\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003ePrepare the housing and surrounding seals to ensure a clean seating surface\u003c\/li\u003e\n    \u003cli\u003eMatch the OEM numbers listed to confirm fitment before purchasing\u003c\/li\u003e\n    \u003cli\u003eTake care during reassembly to avoid twisting or pinching gaskets\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will this thermostat kit fit my Johnson\/Evinrude outboard?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It covers many 5–235 HP models and Jet engines; verify the OEM numbers noted in the listing for exact fit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What is included in the kit?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Thermostat in stainless steel with two seals; gasket set included for installation.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"QUICKMARINE","offers":[{"title":"Default Title","offer_id":42465431289941,"sku":"B0D922FKG2","price":29.64,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0632\/3270\/4597\/files\/quickmarine-thermostat-seals-kit-outboard-assembly.jpg?v=1778007455","url":"https:\/\/plentytorque.co.uk\/products\/quickmarine-393659-thermostat-seals-kit-for-johnson-evinrude-5-235-hp-outboards-sierra-18-3543-replacement","provider":"PlentyTorque","version":"1.0","type":"link"}