{"product_id":"volvo-915","title":"Volvo Penta Lower Gear Housing O-Ring SX-A DPS - 3889786","description":"\u003cp\u003eThe \u003cstrong\u003eVolvo Penta 3889786 Lower Gear Housing O-Ring\u003c\/strong\u003e is a genuine OEM molded sealing ring used in compatible Volvo Penta sterndrive lower gear housing assemblies. This static fluid seal helps protect the gearcase joint from water intrusion and helps retain gear lubricant where the lower gear unit and related housing components mate.\u003c\/p\u003e\n\u003cp\u003eIt is commonly serviced alongside companion sealing parts such as \u003cstrong\u003eVolvo Penta 3889784\u003c\/strong\u003e when the lower gear housing is separated, resealed, pressure-tested, or repaired.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Volvo Penta lower gear housing sealing O-ring.\u003c\/li\u003e\n\u003cli\u003eVolvo Penta part number: \u003cstrong\u003e3889786\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eReplaces legacy Volvo Penta part number: \u003cstrong\u003e3841968\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eComponent type: \u003cstrong\u003emolded O-ring \/ drive housing gasket\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eDesigned for compatible Volvo Penta sterndrive lower gear unit sealing applications.\u003c\/li\u003e\n\u003cli\u003eHelps prevent water entry into internal gear chambers.\u003c\/li\u003e\n\u003cli\u003eHelps retain marine gear lubricant at the housing joint.\u003c\/li\u003e\n\u003cli\u003eLow-profile elastomeric static seal.\u003c\/li\u003e\n\u003cli\u003eUsed in lower unit reseal, prop shaft service, and gearcase pressure-integrity repairs.\u003c\/li\u003e\n\u003cli\u003eRelated companion seal: \u003cstrong\u003eVolvo Penta 3889784\u003c\/strong\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eDrive Compatibility\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eCommon application context includes Volvo Penta sterndrive lower gear housing assemblies where \u003cstrong\u003e3889786\u003c\/strong\u003e or superseded number \u003cstrong\u003e3841968\u003c\/strong\u003e is listed in the parts diagram, including:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eVolvo Penta \u003cstrong\u003eSX-A\u003c\/strong\u003e sterndrive applications where specified.\u003c\/li\u003e\n\u003cli\u003eVolvo Penta \u003cstrong\u003eDPS-A\u003c\/strong\u003e sterndrive applications where specified.\u003c\/li\u003e\n\u003cli\u003eVolvo Penta \u003cstrong\u003eDPS-B\u003c\/strong\u003e sterndrive applications where specified.\u003c\/li\u003e\n\u003cli\u003eOXi configuration applications where the parts diagram calls for this seal.\u003c\/li\u003e\n\u003cli\u003eLower gear housing split \/ reseal service.\u003c\/li\u003e\n\u003cli\u003ePropeller shaft assembly service.\u003c\/li\u003e\n\u003cli\u003eGearcase pressure-test and vacuum-test repairs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eUse this seal only where the exact drive model, serial number, gear housing style, and Volvo Penta parts diagram confirm \u003cstrong\u003e3889786\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eSerial Number Fitment Notice\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eConfirm fitment by Volvo Penta drive model, serial number, gear housing revision, diagram location, and related sealing components before ordering. SX-A, DPS-A, DPS-B, and OXi drive configurations can vary by production range, gear housing design, and previous service history.\u003c\/p\u003e\n\u003cp\u003eIf performing a complete lower unit reseal, confirm whether the job also requires the complete seal bundle, such as Volvo Penta lower unit gasket kit references \u003cstrong\u003e3888821\u003c\/strong\u003e or \u003cstrong\u003e3888822\u003c\/strong\u003e, where applicable.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eWhen This Part Needs Replacement\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eReplace this O-ring whenever the lower gear housing joint is opened, during a lower unit split, after prop shaft reseal work, after gearcase impact repair, or when pressure\/vacuum testing indicates leakage. Replacement is also recommended if the seal is flattened, cut, swollen, hardened, twisted, pinched, contaminated, or exposed during disassembly.\u003c\/p\u003e\n\u003cp\u003eMilky gear oil, gear lube loss, pressure-test failure, or water intrusion during drain inspection are all signs that the gearcase sealing system should be inspected and serviced.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eInstallation Notes\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eClean the aluminum mating surfaces and O-ring groove thoroughly before installation. Remove salt crust, old gasket residue, gear oil, sealant, grit, and corrosion from the groove and housing faces. A small piece of debris or a twisted O-ring can create a leak path after reassembly.\u003c\/p\u003e\n\u003cp\u003eLightly lubricate the new O-ring with clean marine gear oil before seating it in the groove. Make sure it lies flat without stretching, rolling, or pinching. Align the gear housing carefully during assembly and tighten fasteners according to the Volvo Penta service procedure. After reassembly, pressure-test and vacuum-test the gearcase before refilling with lubricant.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eAlternate \/ Superseded Part Numbers\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVolvo Penta 3889786\u003c\/strong\u003e — current supplied part number\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVolvo Penta 3841968\u003c\/strong\u003e — legacy \/ superseded reference\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3889786 O-Ring\u003c\/strong\u003e — common catalog description\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLower Gear Housing Gasket\u003c\/strong\u003e — common application description\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVolvo Penta 3889784\u003c\/strong\u003e — related companion lower gear housing seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVolvo Penta 3888821\u003c\/strong\u003e — related lower unit gasket kit reference; verify by drive model\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVolvo Penta 3888822\u003c\/strong\u003e — related lower unit repair kit reference; verify by drive model\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eParts Desk Insight\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThis seal works as part of the lower gear housing sealing system, not as an isolated component. When one O-ring has been disturbed, the surrounding seals should be inspected at the same time. A clean groove, correct seal placement, and a successful pressure\/vacuum test are the best safeguards against water-contaminated gear oil and internal gearcase damage.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShipping:\u003c\/strong\u003e Ships same or next day for fast Canada wide shipping. ⚓\u003c\/p\u003e","brand":"VOL","offers":[{"title":"Default Title","offer_id":43564038193188,"sku":"3889786","price":7.3,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/cfbd38e4-8281-4d41-bd5a-4a34fcdab22a.png?v=1781654468","url":"https:\/\/marisolmarine.com\/products\/volvo-915","provider":"Marisol Marine Company","version":"1.0","type":"link"}