{"product_id":"bonbo-bearing-carrier-retainer-wrench-for-mercruiser-alpha-bravo-one-4-3-8-heat-treated-steel-black-oxide-finish","title":"Bonbo Bearing Carrier Retainer Wrench for Mercruiser Alpha \u0026 Bravo One 4-3\/8\" — Heat-Treated Steel, Black-Oxide Finish","description":"\u003cp\u003e\u003cstrong\u003eThe Bonbo Bearing Carrier Retainer Wrench is a heavy-duty, direct-replacement tool made to remove and install the 4-3\/8\" retainer nut on Mercruiser Alpha and Bravo One outdrives.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis purpose-built wrench matches OEM fitments for part numbers 91-61069, 91-61069T and 18-9858 and is engineered for repeatable, precise engagement with Mercruiser Alpha One, Pre-Alpha, Generation I and II, and Bravo One (TRS) drive units. Constructed from heat-treated steel with a black-oxide finish, the tool resists corrosion and impact while delivering the torque control technicians need during impeller service, gearbox maintenance and outdrive rebuilds.\u003c\/p\u003e\n\n\u003ch3\u003eWill this wrench work with my Mercruiser outdrive?\u003c\/h3\u003e\n\n\u003cp\u003eYes — the wrench is sized specifically for the 4-3\/8\" bearing carrier retainer nut used on many Alpha family outdrives. It does not fit Bravo Two, Bravo Three, XR or TR models, so verify your outdrive type before ordering.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eCompatible with Mercruiser Alpha One, Pre-Alpha, Generation I and II, Bravo One TRS\u003c\/li\u003e\n  \u003cli\u003eFits Mercury\/Mariner outboards 150 HP and larger\u003c\/li\u003e\n  \u003cli\u003eReplaces OEM 91-61069, 91-61069T, 18-9858\u003c\/li\u003e\n  \u003cli\u003eNot compatible with Bravo 2\/3, XR or TR models\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow durable is the Bonbo retainer wrench under heavy use?\u003c\/h3\u003e\n\n\u003cp\u003eThe wrench is forged from high-grade steel and finished with a black-oxide coating to resist rust and wear during repeated shop and field use. Precision machining keeps the engagement surfaces true so the tool won’t slip or round off the retainer nut under normal service torque.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eHeat-treated steel body for strength and wear resistance\u003c\/li\u003e\n  \u003cli\u003eBlack-oxide finish to minimize corrosion in marine environments\u003c\/li\u003e\n  \u003cli\u003ePrecision-cut engagement for secure, non-slip contact\u003c\/li\u003e\n  \u003cli\u003eImpact-resistant design for mechanic use\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I use this wrench safely for outdrive service?\u003c\/h3\u003e\n\n\u003cp\u003eFit the wrench squarely over the 4-3\/8\" retainer nut, then apply steady torque using an appropriate breaker bar or torque wrench. Avoid sudden impacts unless using an impact-rated drive and follow the manufacturer's torque and disassembly instructions for your specific engine and year.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eSeat wrench fully on retainer nut before applying torque\u003c\/li\u003e\n  \u003cli\u003eUse hand tools for controlled torque; reserve impacts for compatible tools\u003c\/li\u003e\n  \u003cli\u003eFollow engine-specific torque specifications and removal order\u003c\/li\u003e\n  \u003cli\u003eInspect tool and nut faces for damage before reuse\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat makes this Bonbo tool different from the OEM version?\u003c\/h3\u003e\n\n\u003cp\u003eBonbo's tool is manufactured to match OEM dimensions while offering a robust black-oxide finish and quality steel at a better value. It's produced as a direct-fit replacement to simplify maintenance without changing service procedures or specialized equipment.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eDirect-fit replacement for OEM part numbers\u003c\/li\u003e\n  \u003cli\u003eCost-effective option with OEM-equivalent dimensions\u003c\/li\u003e\n  \u003cli\u003eFinished to resist saltwater and workshop conditions\u003c\/li\u003e\n  \u003cli\u003eBacked by Bonbo's customer satisfaction policy\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? The Bonbo Bearing Carrier Retainer Wrench is aimed at marine technicians, DIY boat owners and service shops that maintain Mercruiser Alpha-series outdrives. If you perform impeller, bearing or gearcase work on Alpha One, Generation I\/II or Bravo One TRS drives and need a dependable, OEM-fit tool without a premium price, this wrench is designed for your toolbox.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this wrench fit Bravo Two or Bravo Three outdrives?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. It is not compatible with Bravo 2, Bravo 3, XR, or TR models.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Which OEM part numbers does this replace?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It replaces OEM numbers 91-61069, 91-61069T and 18-9858.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Bonbo","offers":[{"title":"Default Title","offer_id":48085763326110,"sku":"B08V52CSMK","price":43.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/bonbo-front-view-wrench_8c9d1efb-3792-4365-8c62-0b5b51069908.jpg?v=1785877257","url":"https:\/\/northtrailauto.ca\/products\/bonbo-bearing-carrier-retainer-wrench-for-mercruiser-alpha-bravo-one-4-3-8-heat-treated-steel-black-oxide-finish","provider":"North Trail Auto","version":"1.0","type":"link"}