{"product_id":"b-toys-160-f-thermostat-kit-for-omc-volvo-penta-4-3-5-8l-v6-v8-gasket-o-ring-replacement","title":"B. toys 160°F Thermostat Kit for OMC \u0026 Volvo Penta 4.3–5.8L V6\/V8 — Gasket \u0026 O‑Ring Replacement","description":"\u003cp\u003e\u003cstrong\u003eB. toys 160°F thermostat kit is a complete replacement set (thermostat, gasket, O‑ring) designed to restore proper cooling operation on specified OMC Cobra and Volvo Penta 4.3L, 5.0L, 5.7L and 5.8L V6\/V8 sterndrive engines.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis kit contains a 160°F thermostat, a matching gasket, and an O‑ring packaged new for direct replacement of worn or leaking parts on compatible marine sterndrive engines. It replaces OEM numbers including 3856961 and aftermarket references like Sierra 18‑3677, and is intended for the smaller thermostat size used in many Volvo installations. Before ordering, confirm the part matches your engine year and model—especially since OMC and Volvo used different designs and Volvo used both small and large thermostats.\u003c\/p\u003e\n\n\u003ch3\u003eWhich engine models and years does this thermostat kit fit?\u003c\/h3\u003e\n\u003cp\u003eThis kit fits a range of OMC Cobra and Volvo Penta sterndrive applications built on Ford and GM blocks. It covers 4.3L, 5.0L, 5.7L and 5.8L V6 and V8 engines for the model years listed, and is the small Volvo thermostat variant. Always cross‑check the OEM part numbers and physical dimensions against your existing thermostat housing.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eOMC Cobra: 4.3L (1994–1997), 4.3HO (1994–1997), 5.0L (1994–1997), 5.8L (1994–1997), 5.8EFI (1994–1997)\u003c\/li\u003e\n  \u003cli\u003eVolvo Penta codes: fits combinations labeled 4.3GL, 4.3GS, 4.3Gi, 4.3Gi5.8FL, 5.0FL, 5.0Fi, 5.7GL, 5.7Gi and 5.8Fi\/5.8FSi where the small thermostat is used\u003c\/li\u003e\n  \u003cli\u003eReplaces OEM 3856961 and related aftermarket numbers like 18‑3677 and 383307\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I know if I should replace my thermostat, gasket, and O‑ring?\u003c\/h3\u003e\n\u003cp\u003eSigns that the kit is needed include engine overheating, coolant leaks around the housing, or a thermostat that sticks open or closed. Because the gasket and O‑ring commonly degrade when removing a stuck thermostat, replacing all three parts at once prevents repeat service and improves sealing.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eOverheating or inconsistent temperature at cruising RPMs\u003c\/li\u003e\n  \u003cli\u003eVisible coolant seepage or dried residue at thermostat housing\u003c\/li\u003e\n  \u003cli\u003eThermostat sticking, failing to open at 160°F specification\u003c\/li\u003e\n  \u003cli\u003eRoutine preventative maintenance when performing thermoregulation service\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat does the kit include and how does it compare to OEM parts?\u003c\/h3\u003e\n\u003cp\u003eThe kit ships with a 160°F thermostat, a molded gasket, and an O‑ring sized for the matching thermostat housing. It is manufactured to replace the listed OEM and aftermarket numbers, but it is not compatible with 4‑cylinder engines or larger Volvo thermostat variants—measure and compare to avoid fitment issues.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eOne 160°F thermostat (replacement for OEM 3856961)\u003c\/li\u003e\n  \u003cli\u003eOne gasket (replacement for OEM 3852111)\u003c\/li\u003e\n  \u003cli\u003eOne O‑ring (replacement for OEM 3852071)\u003c\/li\u003e\n  \u003cli\u003eCompare physical size to the existing thermostat; this kit is the smaller Volvo size\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this kit for? Boat owners, marine mechanics, and DIY technicians working on OMC Cobra or Volvo Penta sterndrive engines built on Ford\/GM 4.3L–5.8L platforms who need a dependable, ready‑to‑install 160°F thermostat replacement. Choose this kit when you require the small Volvo thermostat variant, want a complete gasket and O‑ring set for leak‑free installation, and have verified compatibility with the engine year and OEM numbers listed. If unsure, remove the old thermostat and compare dimensions and part numbers before purchase.\u003c\/p\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: Is this thermostat kit compatible with 4‑cylinder Volvo engines?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. This kit is for 4.3L–5.8L V6 and V8 sterndrive engines only, not 4‑cylinder models.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What temperature does the thermostat open at?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: The thermostat is rated to open at 160°F (approximately 71°C).\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"B. toys","offers":[{"title":"Default Title","offer_id":48084841726110,"sku":"B077XG95F2","price":34.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/b-toys-front-package-thermostat-kit.jpg?v=1785863335","url":"https:\/\/northtrailauto.ca\/products\/b-toys-160-f-thermostat-kit-for-omc-volvo-penta-4-3-5-8l-v6-v8-gasket-o-ring-replacement","provider":"North Trail Auto","version":"1.0","type":"link"}