{"product_id":"grommet-for-evinrude-johnson-omc-v-6-crossflow-outboards-replaces-omc-320880-sierra-18-1221-18-1221-9-2-pack","title":"Sierra Retainer Gasket 18-1221-9, 2-Pack, Fits Johnson\/Evinrude 200 HP and 225 HP (1988-93)","description":"\u003cp\u003eThe Sierra Retainer Gasket 18-1221-9 is a two-pack replacement gasket used with the thermostat retainer on select Johnson\/Evinrude (OMC\/BRP) outboard powerheads. This gasket seals the retainer housing that holds the thermostat in place within the cooling system, helping maintain proper sealing pressure and preventing coolant leakage around the retainer during operation. Sold as a set of two, it gives an installer a spare on hand for a follow-up service or a second engine, which is useful since gaskets should be replaced any time the retainer is removed rather than reused. This part is specifically called out in Sierra's application charts for Johnson\/Evinrude 200 HP outboards built 1988-93 and 225 HP outboards built 1988-93, distinguishing it from the separate part number used on earlier 185 HP, 200 HP (1977-83), and 235 HP models in the same engine family. Confirming the exact HP and year of the outboard before ordering ensures the correct retainer gasket is installed, since Sierra lists a different part number for those other model years. As with any gasket, proper surface prep and correct torque on the retainer hardware during reassembly are important to achieve a good seal.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-1221-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 2 gaskets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.03 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Thermostat Retainer Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282162368\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Johnson\/Evinrude (OMC\/BRP) 200 HP (1988-93), 225 HP (1988-93)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eJohnson\/Evinrude (OMC\/BRP) 200 HP, 1988-93\u003c\/li\u003e\n\u003cli\u003eJohnson\/Evinrude (OMC\/BRP) 225 HP, 1988-93\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eNo OEM cross-reference numbers are listed for this part.\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-1221-9 retainer gasket used for?\u003c\/strong\u003e It seals the thermostat retainer on the powerhead of compatible Johnson\/Evinrude (OMC\/BRP) outboards, part 18-1221-9, helping the retainer housing hold pressure and keep coolant from leaking around the thermostat area.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in the Sierra 18-1221-9 package?\u003c\/strong\u003e Two retainer gaskets are included in each 18-1221-9 package, giving you a spare for a future service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich outboards does part 18-1221-9 fit?\u003c\/strong\u003e Sierra's application chart lists 18-1221-9 for Johnson\/Evinrude (OMC\/BRP) 200 HP outboards built 1988-93 and 225 HP outboards built 1988-93.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes 18-1221-9 fit earlier 200 HP Johnson\/Evinrude outboards from the 1970s and 80s?\u003c\/strong\u003e No. Sierra's chart shows a different retainer gasket part number for 200 HP models built 1977-83, so 18-1221-9 is specific to the 1988-93 200 HP and 225 HP applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-1221-9 the same gasket used on 185 HP or 235 HP Johnson\/Evinrude models?\u003c\/strong\u003e No. Those horsepower ratings (185 HP 1984-85 and 235 HP 1978-85) use a different Sierra part number in the same application chart, not 18-1221-9.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-1221-9 gasket set weigh?\u003c\/strong\u003e The 18-1221-9 two-pack weighs 0.03 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShould the retainer gasket be reused after removing the thermostat retainer?\u003c\/strong\u003e No, a fresh gasket like the Sierra 18-1221-9 should be installed any time the thermostat retainer is removed, since a used gasket may not reseal properly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-1221-9 gasket genuine OEM or an aftermarket replacement?\u003c\/strong\u003e The 18-1221-9 is a Sierra-branded replacement gasket manufactured to fit the specified Johnson\/Evinrude outboard applications; no OEM cross-reference number is listed for it in Sierra's catalog.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order part 18-1221-9?\u003c\/strong\u003e Ordering 18-1221-9 gets you a package of two thermostat retainer gaskets; no other hardware or thermostat is included.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat UPC is associated with the Sierra 18-1221-9 gasket 2-pack?\u003c\/strong\u003e The UPC for the 18-1221-9 two-pack is 808282162368.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988087091419,"sku":"SIE-18-1221-9","price":2.42,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-1221-9_lg__11130.1722348497.500.750.jpg?v=1785329181","url":"https:\/\/www.goodvibesmarina.com\/products\/grommet-for-evinrude-johnson-omc-v-6-crossflow-outboards-replaces-omc-320880-sierra-18-1221-18-1221-9-2-pack","provider":"Good Vibes Marina","version":"1.0","type":"link"}