{"product_id":"lower-unit-seal-kit-fits-volvo-penta-sx-a-sterndrive-replaces-3888821-18-2583","title":"Lower Unit Seal Kit – Fits Volvo Penta SX-A Sterndrive (Replaces 3888821, 18-2583)","description":"\u003cstyle\u003e\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n  table.ss-table th {\n    white-space:nowrap;\n    word-break:normal;\n    letter-spacing:normal;\n    font-weight:600;\n    background:#f8fafc;\n  }\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003eLower Unit Seal Kit – Fits Volvo Penta SX-A Sterndrive\u003c\/strong\u003e is designed specifically for Volvo Penta SX-A lower gearcase assemblies. It provides a complete seal solution for transom sterndrive units, ensuring reliable protection against water intrusion and oil leakage during regular maintenance or gearcase rebuilds.\u003c\/p\u003e\n\u003cp\u003eThis aftermarket kit directly replaces Volvo Penta 3888821, Orbitrade 23022, and Sierra 18-2583.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eComplete lower gearcase seal replacement for SX-A sterndrives\u003c\/li\u003e\n  \u003cli\u003eDesigned for straightforward installation during routine lower unit service\u003c\/li\u003e\n  \u003cli\u003eIncludes all essential seals for lower unit rebuild or maintenance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003ePart Number\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n        \u003ctd\u003e3888821\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eOrbitrade\u003c\/td\u003e\n        \u003ctd\u003e23022\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-2583\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine \u0026amp; Model Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eModel\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eVolvo Penta\u003c\/td\u003e\n        \u003ctd\u003eSX-A\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eApplication\u003c\/dt\u003e\n  \u003cdd\u003eLower gearcase seal kit\u003c\/dd\u003e\n  \u003cdt\u003eFitment\u003c\/dt\u003e\n  \u003cdd\u003eVolvo Penta SX-A sterndrive\u003c\/dd\u003e\n  \u003cdt\u003eComponent Type\u003c\/dt\u003e\n  \u003cdd\u003eTransom sterndrive lower unit seal kit\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eComplete lower unit seal kit (all seals required for SX-A lower gearcase service)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDisconnect the battery and raise the sterndrive to the full-tilt position before beginning work.\u003c\/li\u003e\n  \u003cli\u003eDrain all lower unit gear oil completely and inspect for metal shavings or water contamination.\u003c\/li\u003e\n  \u003cli\u003eDetach the lower unit from the upper gearcase following manufacturer torque sequence and alignment procedures.\u003c\/li\u003e\n  \u003cli\u003eRemove old seals carefully, cleaning all mating surfaces thoroughly with a non-abrasive solvent.\u003c\/li\u003e\n  \u003cli\u003eInspect seal bores and shafts for scoring, corrosion, or wear that may compromise new seal performance.\u003c\/li\u003e\n  \u003cli\u003eLubricate new seals lightly with gear oil before installation to prevent tearing during assembly.\u003c\/li\u003e\n  \u003cli\u003ePress seals into place squarely using appropriate seal drivers to avoid cocking or damage.\u003c\/li\u003e\n  \u003cli\u003eReassemble the lower unit to the upper gearcase, ensuring proper shaft alignment and torque specifications.\u003c\/li\u003e\n  \u003cli\u003eRefill the lower unit with the correct grade and quantity of gear oil per Volvo Penta specifications.\u003c\/li\u003e\n  \u003cli\u003eRun the engine briefly and inspect all seal areas for leaks before returning to service.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I know if my lower unit seals need replacement?\u003c\/summary\u003e\u003cp\u003eSigns include visible gear oil leaks around the lower unit, water in the gear oil (milky appearance), or excessive oil consumption. Regular inspection during seasonal maintenance is recommended.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan I reuse old seals during reinstallation?\u003c\/summary\u003e\u003cp\u003eNo. Seals are designed for single use and lose their sealing integrity once removed. Always replace seals during any lower unit disassembly to prevent leaks.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat tools are required for installation?\u003c\/summary\u003e\u003cp\u003eYou will need seal drivers or appropriately sized sockets, a torque wrench, gear oil pump, and basic hand tools. A service manual for your specific SX-A model is highly recommended.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs this kit compatible with SX-C or SX-M models?\u003c\/summary\u003e\u003cp\u003eNo. This kit is engineered specifically for SX-A sterndrives. Different Volvo Penta sterndrive models require their own dedicated seal kits.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow often should lower unit seals be replaced?\u003c\/summary\u003e\u003cp\u003eReplace seals whenever the lower unit is disassembled for service, or if leaks are detected. Regular gear oil inspection every 50–100 hours helps identify seal failure early.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat type of gear oil should I use after installation?\u003c\/summary\u003e\u003cp\u003eUse Volvo Penta-recommended lower unit gear oil or an equivalent synthetic or mineral oil meeting the specified viscosity and performance standards for your SX-A drive.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eOEM vs. Aftermarket?\u003c\/summary\u003e\u003cp\u003eThis listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eShipping speed \u0026amp; cost\u003c\/summary\u003e\u003cp\u003eWe ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWarranty \u0026amp; returns\u003c\/summary\u003e\u003cp\u003eCovered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused \u0026amp; in original condition). See our policy page or reach out for instructions.\u003c\/p\u003e\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify images\/specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended for safety and performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003ePro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n  \u003cli\u003eFast Global Fulfillment — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n  \u003cli\u003eManufacturer-Direct Value — Fair pricing without compromising on materials or QC.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":51025809801531,"sku":"23SK648","price":57.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/s-l1600_0bbcda42-5bf5-423b-9535-f010f61bb709.jpg?v=1773149418","url":"https:\/\/seasierra.com\/products\/lower-unit-seal-kit-fits-volvo-penta-sx-a-sterndrive-replaces-3888821-18-2583","provider":"SeaSierra","version":"1.0","type":"link"}