{"product_id":"yanmar-21","title":"Yanmar O-Ring Seal 119578-18420 - Marine Diesel Engine","description":"\u003cp data-start=\"53\" data-end=\"558\"\u003eYanmar 119578-18420 is an \u003cstrong data-start=\"105\" data-end=\"120\"\u003eO-ring seal\u003c\/strong\u003e used in select Yanmar marine diesel applications. Public parts references most consistently place this part in \u003cstrong data-start=\"232\" data-end=\"278\"\u003eintercooler \/ air-cooler \/ intake-manifold\u003c\/strong\u003e sealing applications, with the strongest fitment trail pointing to \u003cstrong data-start=\"346\" data-end=\"361\"\u003e6LY3-series\u003c\/strong\u003e engines and some related \u003cstrong data-start=\"387\" data-end=\"401\"\u003e6CX-series\u003c\/strong\u003e applications. The available public data supports this as a model-specific sealing ring rather than a universal O-ring. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"560\" data-end=\"578\"\u003e\u003cstrong data-start=\"560\" data-end=\"576\"\u003eKey Features\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"579\" data-end=\"1086\"\u003e\n\u003cli data-start=\"579\" data-end=\"618\"\u003eYanmar part number \u003cstrong data-start=\"600\" data-end=\"616\"\u003e119578-18420\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"619\" data-end=\"685\"\u003eIdentified in public listings as \u003cstrong data-start=\"654\" data-end=\"664\"\u003eO-RING\u003c\/strong\u003e or \u003cstrong data-start=\"668\" data-end=\"683\"\u003eO-RING SEAL\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"686\" data-end=\"779\"\u003eCommonly associated with \u003cstrong data-start=\"713\" data-end=\"759\"\u003eintercooler \/ air cooler \/ intake manifold\u003c\/strong\u003e sealing locations\u003c\/li\u003e\n\u003cli data-start=\"780\" data-end=\"870\"\u003eFound in public Yanmar catalog references for multiple \u003cstrong data-start=\"837\" data-end=\"852\"\u003e6LY3-series\u003c\/strong\u003e engine variants\u003c\/li\u003e\n\u003cli data-start=\"871\" data-end=\"957\"\u003eAlso appears in some public references tied to certain \u003cstrong data-start=\"928\" data-end=\"942\"\u003e6CX-series\u003c\/strong\u003e applications\u003c\/li\u003e\n\u003cli data-start=\"958\" data-end=\"1086\"\u003eBest matched by exact part number and engine application rather than by dimensions alone \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1088\" data-end=\"1646\"\u003e\u003cstrong data-start=\"1088\" data-end=\"1112\"\u003eEngine Compatibility\u003c\/strong\u003e\u003cbr data-start=\"1112\" data-end=\"1115\"\u003eAvailable public references most clearly associate Yanmar 119578-18420 with \u003cstrong data-start=\"1191\" data-end=\"1247\"\u003e6LY3-ETP, 6LY3-STC, 6LY3-STP, 6LY3-UTC, and 6LY3-UTP\u003c\/strong\u003e applications, and Yanmar catalog results also show it in certain \u003cstrong data-start=\"1313\" data-end=\"1320\"\u003e6CX\u003c\/strong\u003e engine schematics. Some aftermarket listings describe broader compatibility such as \u003cstrong data-start=\"1405\" data-end=\"1428\"\u003e6LY2A, 6LY, and 6CX\u003c\/strong\u003e families. Because the public fitment trail spans multiple variants and sources use slightly different naming, this should be treated as a \u003cstrong data-start=\"1567\" data-end=\"1607\"\u003eserial-number-confirmed sealing part\u003c\/strong\u003e. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1648\" data-end=\"1970\"\u003e\u003cstrong data-start=\"1648\" data-end=\"1680\"\u003eSerial Number Fitment Notice\u003c\/strong\u003e\u003cbr data-start=\"1680\" data-end=\"1683\"\u003ePlease confirm fitment by \u003cstrong data-start=\"1709\" data-end=\"1748\"\u003efull engine model and serial number\u003c\/strong\u003e before ordering. This is especially important because the same part number appears across multiple intercooler or intake-related schematic contexts, and public descriptions are brief. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1972\" data-end=\"2425\"\u003e\u003cstrong data-start=\"1972\" data-end=\"2008\"\u003eWhen This Part Needs Replacement\u003c\/strong\u003e\u003cbr data-start=\"2008\" data-end=\"2011\"\u003eReplace this O-ring whenever the related intercooler, air-cooler, or intake-manifold cover is removed and the seal is flattened, hardened, torn, swollen, leaking, or no longer sealing correctly. Public sources identify the part and application context, but detailed service-interval guidance is naturally limited, so this replacement guidance is based on its sealing function. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"2427\" data-end=\"2784\"\u003e\u003cstrong data-start=\"2427\" data-end=\"2449\"\u003eInstallation Notes\u003c\/strong\u003e\u003cbr data-start=\"2449\" data-end=\"2452\"\u003eInstall only on the correct Yanmar application and confirm the exact sealing location before ordering. Because public sources place this part in intercooler \/ intake-manifold assemblies, matching by \u003cstrong data-start=\"2651\" data-end=\"2722\"\u003epart number, engine model, serial number, and removed seal location\u003c\/strong\u003e is the safest approach. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"2786\" data-end=\"2827\"\u003e\u003cstrong data-start=\"2786\" data-end=\"2825\"\u003eAlternate \/ Superseded Part Numbers\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"2828\" data-end=\"3020\"\u003e\n\u003cli data-start=\"2828\" data-end=\"2848\"\u003e\u003cstrong data-start=\"2830\" data-end=\"2846\"\u003e119578-18420\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli data-start=\"2849\" data-end=\"3020\"\u003ePublic service-kit listings also show this exact number as \u003cstrong data-start=\"2910\" data-end=\"2925\"\u003eO-RING SEAL\u003c\/strong\u003e within onboard spares kits for applicable Yanmar engines \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3022\" data-end=\"3438\"\u003e\u003cstrong data-start=\"3022\" data-end=\"3044\"\u003eParts Desk Insight\u003c\/strong\u003e\u003cbr data-start=\"3044\" data-end=\"3047\"\u003eThis is the kind of Yanmar sealing part where the public data is useful but naturally limited. The strongest evidence says it belongs in an \u003cstrong data-start=\"3187\" data-end=\"3250\"\u003eintercooler \/ air-cooler \/ intake-manifold sealing position\u003c\/strong\u003e, but the safest sale is still against the \u003cstrong data-start=\"3293\" data-end=\"3333\"\u003eexact engine model and serial number\u003c\/strong\u003e, especially on 6LY and 6CX applications where assemblies can vary. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"3440\" data-end=\"3505\"\u003eShipping: Ships same or next day for fast Canada wide shipping. ⚓\u003c\/p\u003e","brand":"YAN","offers":[{"title":"Default Title","offer_id":43564306464804,"sku":"119578-18420","price":46.52,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/119578-18420.png?v=1771193811","url":"https:\/\/marisolmarine.com\/products\/yanmar-21","provider":"Marisol Marine Company","version":"1.0","type":"link"}