{"product_id":"bellow-ring-installation-tool-fits-mercury-mercruiser-alpha-1-gen-2-bravo-blackhawk-replaces-91-818162","title":"Bellow Ring Installation Tool – Fits Mercury MerCruiser Alpha 1 Gen 2, Bravo, Blackhawk (Replaces 91-818162)","description":"\u003csection\u003e\n\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\u003cstyle\u003e\n  \/* Outer container allows horizontal scrolling (with iOS momentum) *\/\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n\n  \/* Base table styles *\/\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\n  \/* Key: prevent wrapping, word breaks, and vertical text in headers *\/\n  table.ss-table th {\n    white-space:nowrap;       \/* Do not wrap *\/\n    word-break:normal;        \/* Don’t break words *\/\n    letter-spacing:normal;    \/* Prevent theme styles from stretching letters *\/\n    font-weight:600;\n    background:#f8fafc;\n  }\n\n  \/* Small screen optimization *\/\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\u003eBellow Ring Installation Tool\u003c\/strong\u003e is essential for servicing Mercury MerCruiser stern drives, including Alpha One Gen 2, Bravo series, and Blackhawk models. It is specifically designed to properly install the aluminum retainer ring into the U-joint bellows, ensuring a secure fit without damaging the components. This tool must be used in conjunction with an Engine Alignment Tool for correct installation.\u003c\/p\u003e\n\u003cp\u003eThis part is a direct replacement for Mercury MerCruiser OEM part 91-818162 and aftermarket references such as Sierra 18-9870 and MBSMFG BRSIT-D23.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eInstalls the U-joint bellows aluminum retainer ring.\u003c\/li\u003e\n\u003cli\u003eRequires manual use with an alignment tool and light hammer taps.\u003c\/li\u003e\n\u003cli\u003eAvailable in durable PVC Plastic or Aluminum, depending on the selected option.\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\u003eMercury MerCruiser\u003c\/td\u003e\n        \u003ctd\u003e91-818162\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-9870\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMBSMFG\u003c\/td\u003e\n        \u003ctd\u003eBRSIT-D23\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\u003cp\u003eThis tool is confirmed for use on the following Mercury MerCruiser drive units.\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        \u003cth\u003eOEM Part No.\u003c\/th\u003e\n        \u003cth\u003eNotes\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury MerCruiser\u003c\/td\u003e\n        \u003ctd\u003eAlpha One Gen 2\u003c\/td\u003e\n        \u003ctd\u003e91-818162\u003c\/td\u003e\n        \u003ctd\u003eU-Joint bellows installation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury MerCruiser\u003c\/td\u003e\n        \u003ctd\u003eBravo\u003c\/td\u003e\n        \u003ctd\u003e91-818162\u003c\/td\u003e\n        \u003ctd\u003eU-Joint bellows installation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury MerCruiser\u003c\/td\u003e\n        \u003ctd\u003eBlackhawk\u003c\/td\u003e\n        \u003ctd\u003e91-818162\u003c\/td\u003e\n        \u003ctd\u003eU-Joint bellows installation\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury MerCruiser\u003c\/td\u003e\n        \u003ctd\u003eVazer\u003c\/td\u003e\n        \u003ctd\u003e91-818162\u003c\/td\u003e\n        \u003ctd\u003ePer MercruiserParts.com source\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\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eInstallation Tool\u003c\/dd\u003e\n \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eManual; requires light hammer taps\u003c\/dd\u003e\n \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003ePVC Plastic (aftermarket) or Aluminum (OEM\/aftermarket options)\u003c\/dd\u003e\n \u003cdt\u003eHousing Color\u003c\/dt\u003e\n\u003cdd\u003eBlack or Silver (depending on material)\u003c\/dd\u003e\n \u003cdt\u003eOther Technical Attributes\u003c\/dt\u003e\n\u003cdd\u003eUsed with Engine Alignment Tool to properly install aluminum ring into U-joint bellows\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 x Bellow Retainer Ring Installation Tool (91-818162)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eEnsure the drive is properly prepared and an Engine Alignment Tool is correctly in place.\u003c\/li\u003e\n\u003cli\u003eApply a suitable marine-grade lubricant to the U-joint bellows and the new aluminum retainer ring.\u003c\/li\u003e\n\u003cli\u003eCarefully position the retainer ring over the end of the bellows.\u003c\/li\u003e\n\u003cli\u003ePlace the Bellow Ring Installation Tool over the retainer ring.\u003c\/li\u003e\n\u003cli\u003eUsing a mallet or hammer, apply light, even taps to the installation tool to drive the ring into its groove.\u003c\/li\u003e\n\u003cli\u003eContinue tapping around the tool until the ring is fully and evenly seated.\u003c\/li\u003e\n\u003cli\u003eVisually inspect the ring to confirm it is secure and has not damaged the bellows.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich sterndrives is this tool designed for?\u003c\/summary\u003e\n\u003cp\u003eThis tool fits Mercury MerCruiser Alpha One Gen 2, Bravo Series (I, II, III), Blackhawk, and Vazer drives. It is essential for working on the U-joint bellows for these models.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I actually need this tool for the installation?\u003c\/summary\u003e\n\u003cp\u003eYes. This tool is specifically designed to install the aluminum retainer ring evenly and without damage. Attempting the installation without it can lead to a damaged bellows or a poor seal, causing water leaks and gimbal bearing failure.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs there a difference between the PVC and aluminum versions?\u003c\/summary\u003e\n\u003cp\u003eThe original OEM tool is typically made of aluminum. Aftermarket versions are available in both high-strength PVC and aluminum. Both materials are durable and designed to perform the installation correctly. The PVC version offers excellent value and corrosion resistance.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat are the signs of a failed bellows retaining ring?\u003c\/summary\u003e\n\u003cp\u003eThe primary symptom of a failed or improperly installed retaining ring is water intrusion into the gimbal area. This can lead to a rusted gimbal bearing, which often produces a grinding or roaring noise when turning the wheel, especially out of the water.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eOEM vs. Aftermarket?\u003c\/summary\u003e\n\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\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eShipping speed \u0026amp; cost\u003c\/summary\u003e\n\u003cp\u003eWe ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWarranty \u0026amp; returns\u003c\/summary\u003e\n\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\n\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eVerify images\/specifications vs 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\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50717889102139,"sku":"21BR001","price":18.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Bellow_Retainer_Ring_installer_for_Mercury_MerCruiser_Engines_______91-818162_-_JLM_MARINE-8287031.jpg?v=1762937467","url":"https:\/\/seasierra.com\/products\/bellow-ring-installation-tool-fits-mercury-mercruiser-alpha-1-gen-2-bravo-blackhawk-replaces-91-818162","provider":"SeaSierra","version":"1.0","type":"link"}