{"product_id":"cummins-39","title":"Cummins — Aftercooler Housing O-Ring ISB QSB — 3919853","description":"\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe Cummins 3919853 O-Ring Seal is a factory Cummins sealing gasket used on select Cummins diesel engine assemblies, including marine aftercooler and turbocharger-related sealing locations where the parts diagram calls for this number. In marine service, 3919853 is commonly known as the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ethin aftercooler core housing O-ring\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. It is used to seal the aftercooler core housing interface and help prevent coolant seepage, boost-air leakage, and loss of proper charge-air cooling performance.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e\u003cspan\u003eKey Features\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eCummins part number:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 3919853\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eProduct type:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e O-ring seal \/ sealing gasket\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eCommon marine reference:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Thin aftercooler core housing O-ring\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003ePrimary service location:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Aftercooler core housing sealing area on applicable Cummins engines\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eAdditional application context:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Used in select Cummins turbocharger or air-system sealing locations where specified by parts diagram\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eFitment identifier:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Used on housings with the narrow casting gap, approximately 0.070\" between the bolt hole and casting edge\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eRelated service kit reference:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 4025341\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eRelated alternate-size O-ring:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 4019975 “fat” aftercooler O-ring for wider-gap housings\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003e\u003cspan\u003eEngine Compatibility\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThis O-ring is commonly associated with select Cummins medium-duty, industrial, and marine diesel platforms, including applications in the following engine families:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\u003cspan\u003eCummins 5.9L ISB \/ QSB\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCummins 6B5.9\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCummins 6C8.3\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCummins QSB6.7\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eTier 3 5.9L ISB \/ QSB marine applications where the aftercooler housing calls for the thin 3919853 seal\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eFitment must be confirmed by engine serial number, CPL, aftercooler housing design, and Cummins parts diagram.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e\u003cspan\u003eSerial Number Fitment Notice\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eCummins used more than one aftercooler core housing O-ring profile depending on casting design. The 3919853 is the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ethin\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e version and is typically used when the aftercooler housing has a narrow approximately \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e0.070\" gap\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e between the bolt hole and the edge of the casting. Engines with the wider casting gap may require the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e4019975 fat O-ring\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e instead.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eBefore ordering, confirm the engine serial number, CPL, aftercooler housing casting, and original O-ring profile. Do not select this seal by engine displacement alone.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e\u003cspan\u003eWhen This Part Needs Replacement\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eReplace this O-ring whenever the aftercooler core is removed, the aftercooler housing is opened, or the seal shows flattening, cracking, swelling, hardening, cuts, or compression set. It should also be inspected if there are signs of coolant seepage, boost-air leakage, corrosion staining, salt deposits, reduced charge-air cooling performance, or unexplained performance loss.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eA used aftercooler O-ring should not be reused after disassembly, especially on marine engines exposed to heat cycling, vibration, coolant, boost pressure, and salt-air operating conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e\u003cspan\u003eInstallation Notes\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eClean the aftercooler housing groove and mating surfaces before installing the new O-ring. Inspect the aftercooler core, housing casting, bolt holes, sealing lands, and corrosion-prone edges before reassembly. Make sure the O-ring sits evenly in the groove and is not twisted, stretched, pinched, or cut during installation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eFollow the Cummins service procedure for aftercooler removal, cleaning, pressure testing, reassembly, and torque sequence. If the aftercooler has been removed for cleaning or service, inspect related seals, gaskets, hoses, clamps, and mounting hardware before returning the engine to service.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003e\u003cspan\u003eAlternate\/Superseded Part Numbers\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eCummins:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 3919853\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eRelated Cummins service kit reference:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 4025341\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eRelated larger-profile aftercooler O-ring:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 4019975\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eCommon description:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Thin aftercooler core housing O-ring\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003e\u003cspan\u003eParts Desk Insight\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe critical detail on this Cummins aftercooler seal is the housing profile. The 3919853 thin O-ring and the 4019975 fat O-ring are not interchangeable just because the engine family looks similar. Match the seal to the aftercooler casting gap, engine serial number, and Cummins parts diagram before ordering.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eShipping:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Ships same or next day for fast Canada wide shipping. ⚓\u003c\/span\u003e\u003c\/p\u003e","brand":"CUM","offers":[{"title":"Default Title","offer_id":43563784273956,"sku":"3919853","price":3.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/bd313c24-bd9f-47c7-a902-1903a7206583.png?v=1782451171","url":"https:\/\/marisolmarine.com\/products\/cummins-39","provider":"Marisol Marine Company","version":"1.0","type":"link"}