{"product_id":"shift-shaft-bushing-tool-fits-mercury-mariner-115-200hp-replaces-91-31107t-18-9817","title":"Shift Shaft Bushing Tool – Fits Mercury Mariner 115-200HP (Replaces 91-31107T, 18-9817)","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\u003eThe \u003cstrong\u003eShift Shaft Bushing Tool\u003c\/strong\u003e is a precision installation tool designed for Mercury Mariner outboard engines ranging from 115 to 200 horsepower. Constructed from high-strength forged steel that has been hardened and zinc-nickel alloy plated, this tool ensures reliable performance during shift shaft bushing installation and removal procedures.\u003c\/p\u003e\n\u003cp\u003eThis aftermarket replacement directly replaces Sierra 18-9817, GLM 90140, and Mercury part numbers 91-31107T, 91-31107, 91-23033T, 91-23033, and 91-24150.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eForged and hardened steel construction ensures greater strength and toughness during installation\u003c\/li\u003e\n  \u003cli\u003eZinc-nickel plating provides superior corrosion resistance and withstands high-temperature environments\u003c\/li\u003e\n  \u003cli\u003eMeets or exceeds OEM quality standards for reliable, repeatable use\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\u003e91-31107T\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e91-31107\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e91-23033T\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e91-23033\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e91-24150\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-9817\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGLM\u003c\/td\u003e\n        \u003ctd\u003e90140\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\u003eRated HP\u003c\/th\u003e\n        \u003cth\u003eOEM Part No.\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury Mariner\u003c\/td\u003e\n        \u003ctd\u003e115–200 HP\u003c\/td\u003e\n        \u003ctd\u003e91-31107T\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\u003eMaterial\u003c\/dt\u003e\n  \u003cdd\u003eHigh Strength Forged Steel, Hardened\u003c\/dd\u003e\n  \u003cdt\u003eFinish\u003c\/dt\u003e\n  \u003cdd\u003eZinc-Nickel Alloy Plated\u003c\/dd\u003e\n  \u003cdt\u003eQuality Standard\u003c\/dt\u003e\n  \u003cdd\u003eMeets or Exceeds OEM\u003c\/dd\u003e\n  \u003cdt\u003eCorrosion Resistance\u003c\/dt\u003e\n  \u003cdd\u003eHigh-temperature tolerant with excellent adhesion\u003c\/dd\u003e\n  \u003cdt\u003eApplication\u003c\/dt\u003e\n  \u003cdd\u003eShift Shaft Bushing Installation \u0026amp; Removal\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003cstrong\u003e1 × Shift Shaft Bushing Tool\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eEnsure the outboard engine is completely shut down and the ignition key is removed before beginning work.\u003c\/li\u003e\n  \u003cli\u003eRemove the lower unit assembly according to your engine's service manual to access the shift shaft area.\u003c\/li\u003e\n  \u003cli\u003eUse the shift shaft bushing tool to carefully press out the old bushing without damaging the surrounding housing.\u003c\/li\u003e\n  \u003cli\u003eInspect the shift shaft bore for debris, corrosion, or damage; clean thoroughly before proceeding.\u003c\/li\u003e\n  \u003cli\u003eAlign the new bushing with the tool and press it evenly into position until fully seated.\u003c\/li\u003e\n  \u003cli\u003eVerify the bushing is flush and properly aligned before reassembling the lower unit.\u003c\/li\u003e\n  \u003cli\u003eReinstall the lower unit, torque all fasteners to specification, and test shift operation before returning to service.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eWhich Mercury engines does this tool fit?\u003c\/summary\u003e\u003cp\u003eThis shift shaft bushing tool is designed for Mercury Mariner outboard engines from 115 to 200 horsepower. Always verify your engine's part number against the replacements listed to ensure compatibility.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan I install the bushing without this tool?\u003c\/summary\u003e\u003cp\u003eWhile some technicians attempt installation using makeshift tools, this dedicated tool ensures even pressure distribution and proper alignment, reducing the risk of damage to the bushing or housing.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are signs that my shift shaft bushing needs replacement?\u003c\/summary\u003e\u003cp\u003eCommon symptoms include excessive play in the shift lever, difficulty shifting gears, grinding noises during gear engagement, or visible wear and scoring on the shift shaft. If you observe any of these, inspect and replace the bushing as needed.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs this tool reusable?\u003c\/summary\u003e\u003cp\u003eYes, the hardened forged steel construction is designed for repeated professional use. Proper care and storage will extend tool life significantly.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow does the zinc-nickel plating benefit this tool?\u003c\/summary\u003e\u003cp\u003eZinc-nickel alloy plating offers superior corrosion resistance compared to standard zinc, withstands higher operating temperatures, and provides excellent adhesion, making it ideal for marine environments.\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":51025915380027,"sku":"3547","price":11.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/12_9a9cc263-c73f-4ae4-9025-80739395e7a3.jpg?v=1772975128","url":"https:\/\/seasierra.com\/products\/shift-shaft-bushing-tool-fits-mercury-mariner-115-200hp-replaces-91-31107t-18-9817","provider":"SeaSierra","version":"1.0","type":"link"}