{"product_id":"hinge-pin-tool-fits-mercury-mercruiser-alpha-one-bravo-drives-replaces-91-78310-18-9861-90200","title":"Hinge Pin Tool – Fits Mercury MerCruiser Alpha One \u0026 Bravo Drives (Replaces 91-78310, 18-9861, 90200)","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 specialized \u003cstrong\u003eHinge Pin Tool\u003c\/strong\u003e is designed for removing and installing hinge pins on Mercury MerCruiser sterndrive bell housings. It is compatible with Alpha One (Gen I \u0026amp; II), Bravo (One, Two, Three), and XR series sterndrive models from 1984 to the current production year.\u003c\/p\u003e\n\u003cp\u003eIt serves as a direct replacement for Mercury OEM part 91-78310, Sierra 18-9861, and VG Marine 90200.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Designed for manual use with a 1\/2-inch square drive or hex interface.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Constructed from hardened steel with a black oxide coating for superior rust protection.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrive Interface:\u003c\/strong\u003e Features a versatile 12-point or hex drive interface for secure engagement.\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\u003c\/td\u003e\n        \u003ctd\u003e91-78310\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-9861\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eVG Marine\u003c\/td\u003e\n        \u003ctd\u003e90200\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 fits a wide range of Mercury MerCruiser sterndrive models. Please verify your specific model and serial number range.\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\u003eModel\u003c\/th\u003e\n        \u003cth\u003eDrive Type\u003c\/th\u003e\n        \u003cth\u003eYears\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\u003eALPHA ONE\u003c\/td\u003e\n\u003ctd\u003eGen I\u003c\/td\u003e\n\u003ctd\u003e1984–1990\u003c\/td\u003e\n\u003ctd\u003e91-78310\u003c\/td\u003e\n\u003ctd\u003eSterndrive bell housings\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eALPHA ONE (GEN.II)\u003c\/td\u003e\n\u003ctd\u003eGen II\u003c\/td\u003e\n\u003ctd\u003e1991-2012+\u003c\/td\u003e\n\u003ctd\u003e91-78310\u003c\/td\u003e\n\u003ctd\u003eModel code 0L100040 \u0026amp; Up\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBRAVO\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003e0M100001-0W249999\u003c\/td\u003e\n\u003ctd\u003e91-78310\u003c\/td\u003e\n\u003ctd\u003eFits all Bravo models\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBRAVO ONE\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003e0F730000-0M100000, 0W250000 \u0026amp; Up\u003c\/td\u003e\n\u003ctd\u003e91-78310\u003c\/td\u003e\n\u003ctd\u003eFits all Bravo One years\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBRAVO TWO\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003e0F730000-0M100000, 0M100001-0W249999, 0W250000 \u0026amp; Up\u003c\/td\u003e\n\u003ctd\u003e91-78310\u003c\/td\u003e\n\u003ctd\u003eFits all Bravo Two years\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBRAVO THREE\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003e0F730000-0M100000, 0M100001-0W249999, 0W250000 \u0026amp; Up\u003c\/td\u003e\n\u003ctd\u003e91-78310\u003c\/td\u003e\n\u003ctd\u003eFits all Bravo Three years\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBRAVO X ONE\u003c\/td\u003e\n\u003ctd\u003eX\u003c\/td\u003e\n\u003ctd\u003e0M100001-0W249999, 0W250000 \u0026amp; Up\u003c\/td\u003e\n\u003ctd\u003e91-78310\u003c\/td\u003e\n\u003ctd\u003ePerformance Bravo variant\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBRAVO X TWO\u003c\/td\u003e\n\u003ctd\u003eX\u003c\/td\u003e\n\u003ctd\u003e0M100001-0W249999, 0W250000 \u0026amp; Up\u003c\/td\u003e\n\u003ctd\u003e91-78310\u003c\/td\u003e\n\u003ctd\u003ePerformance Bravo variant\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBRAVO X THREE\u003c\/td\u003e\n\u003ctd\u003eX\u003c\/td\u003e\n\u003ctd\u003e0M100001-0W249999, 0W250000 \u0026amp; Up\u003c\/td\u003e\n\u003ctd\u003e91-78310\u003c\/td\u003e\n\u003ctd\u003ePerformance Bravo variant\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBRAVO XR ONE\u003c\/td\u003e\n\u003ctd\u003eXR\u003c\/td\u003e\n\u003ctd\u003e0L914990-0W239999, 0W240000 \u0026amp; Up\u003c\/td\u003e\n\u003ctd\u003e91-78310\u003c\/td\u003e\n\u003ctd\u003eHigh-performance variant\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBRAVO XR THREE\u003c\/td\u003e\n\u003ctd\u003eXR\u003c\/td\u003e\n\u003ctd\u003e0W240000 \u0026amp; Up\u003c\/td\u003e\n\u003ctd\u003e91-78310\u003c\/td\u003e\n\u003ctd\u003eHigh-performance variant\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBRAVO XR SPORTMASTER\u003c\/td\u003e\n\u003ctd\u003eXR\u003c\/td\u003e\n\u003ctd\u003e0M052945-0M906877, 0M906878 \u0026amp; Up\u003c\/td\u003e\n\u003ctd\u003e91-78310\u003c\/td\u003e\n\u003ctd\u003eRacing\/high-performance\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBRAVO XZ ONE\u003c\/td\u003e\n\u003ctd\u003eXZ\u003c\/td\u003e\n\u003ctd\u003e0L914990-0M999999\u003c\/td\u003e\n\u003ctd\u003e91-78310\u003c\/td\u003e\n\u003ctd\u003eSpecial performance variant\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eHI PERFORMANCE TRANSOM\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003ctd\u003e0W150003 \u0026amp; Up\u003c\/td\u003e\n\u003ctd\u003e91-78310\u003c\/td\u003e\n\u003ctd\u003eUsed on performance models\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eINTEGRATED TRANSOM\u003c\/td\u003e\n\u003ctd\u003e-\u003c\/td\u003e\n\u003ctd\u003eAll-0M052767, 0M052768 \u0026amp; Up\u003c\/td\u003e\n\u003ctd\u003e91-78310\u003c\/td\u003e\n\u003ctd\u003eUsed on integrated transom models\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\u003eHinge Pin Tool (Special Service Tool)\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eManual use\u003c\/dd\u003e\n  \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eHardened Steel\u003c\/dd\u003e\n  \u003cdt\u003eHousing Color\u003c\/dt\u003e\n\u003cdd\u003eBlack\u003c\/dd\u003e\n  \u003cdt\u003eCoating\u003c\/dt\u003e\n\u003cdd\u003eBlack Oxide (for rust protection)\u003c\/dd\u003e\n  \u003cdt\u003eDimensions\u003c\/dt\u003e\n\u003cdd\u003eLength: 2.00 in (50.8 mm), Width: 0.75 in (19.05 mm), Height: 0.75 in (19.05 mm)\u003c\/dd\u003e\n  \u003cdt\u003eWeight\u003c\/dt\u003e\n\u003cdd\u003e0.13 lb (59 g)\u003c\/dd\u003e\n  \u003cdt\u003eDrive Interface\u003c\/dt\u003e\n\u003cdd\u003e12-point or hex drive interface\u003c\/dd\u003e\n  \u003cdt\u003eWarranty\u003c\/dt\u003e\n\u003cdd\u003eVaries by manufacturer; 2-year warranty on VG Marine version\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 Hinge Pin Tool (Replaces 91-78310)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cp\u003eThis tool facilitates the removal and installation of hinge pins that connect the sterndrive bell housing to the gimbal ring. It is essential for tasks such as servicing bellows, replacing gimbal bearings, working on shift cables, or changing trim senders. In most cases, the trim and tilt sender assembly must be removed before accessing the hinge pins. For stubborn pins, applying heat can aid removal and prevent damage to the tool or housing.\u003c\/p\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhat is this tool specifically used for?\u003c\/summary\u003e\n  \u003cp\u003eThis is a special service tool for removing and installing the hinge pins on Mercury MerCruiser sterndrive bell housings (port and starboard sides). These pins are the pivot point connecting the bell housing to the gimbal ring, allowing the drive to tilt.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eWhen is this tool necessary?\u003c\/summary\u003e\n  \u003cp\u003eYou will need this tool when performing service that requires separating the bell housing, such as working on bellows, replacing the gimbal bearing, servicing shift cables, or replacing the trim senders.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eCan I use a different tool as an alternative?\u003c\/summary\u003e\n  \u003cp\u003eSome mechanics report success using a standard 1\/2-inch hex bit socket. However, this genuine-style tool is specifically designed for the application, providing a better fit and reducing the risk of stripping the pin or damaging surrounding components.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I remove a stubborn or corroded hinge pin?\u003c\/summary\u003e\n  \u003cp\u003eIf a hinge pin is seized due to corrosion, applying localized heat to the bell housing around the pin can help break it free. Use caution to avoid damaging nearby components and apply steady, even pressure with the tool.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n  \u003csummary\u003eIs there a quality difference between OEM and aftermarket tools?\u003c\/summary\u003e\n  \u003cp\u003eQuality of aftermarket tools can vary. The original Mercury tool and high-quality aftermarket versions are made of hardened steel with a black oxide coating for durability and rust prevention. Cheaper alternatives may be made of softer metal and can deform or break under high torque.\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\u003e\n\u003cstrong\u003ePro-Grade Standards\u003c\/strong\u003e — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — 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":50717889069371,"sku":"23PT008","price":15.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/Hinge_Pin_Tool_for_Mercruiser_Sterndrive_Models___91-78310_-_JLM_MARINE-8287037.jpg?v=1762937465","url":"https:\/\/seasierra.com\/products\/hinge-pin-tool-fits-mercury-mercruiser-alpha-one-bravo-drives-replaces-91-78310-18-9861-90200","provider":"SeaSierra","version":"1.0","type":"link"}