{"product_id":"sierra-18-9803-spanner-nut-wrench-for-mercruiser-alpha-bravo-mc-i-r-mr-and-blackhawk-drives-replaces-91-17256","title":"Sierra Spanner Nut Wrench 18-9803, Replaces Mercury Marine 91-17256, for MC-I, R-MR, Blackhawk, Bravo and Alpha Drive Units","description":"\u003cp\u003eThe Sierra 18-9803 Spanner Nut Wrench is a specialty stern drive tool used to remove and install the driveshaft bearing retainer. It is built for technicians and DIY boat owners servicing MerCruiser MC-I, R-MR, and Blackhawk stern drives, as well as all Bravo and all Alpha drive units, where the bearing retainer must be broken loose and re-torqued correctly during driveshaft bearing service. The wrench features a fixed square head style designed to engage the retainer without slipping or rounding it off, and it carries a powder coated finish in white for corrosion resistance during shop and marina use.\u003c\/p\u003e\u003cp\u003eBecause the driveshaft bearing retainer sits deep in the gimbal housing area of the drive unit, a purpose-built spanner is required rather than improvised tools, which can damage the retainer or the surrounding housing. The 18-9803 directly replaces Mercury Marine part number 91-17256, so it is a straightforward swap for shops and owners who already reference that OEM number when ordering. As a Sierra product, it is built to meet or exceed the performance of the original equipment part it replaces.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-9803\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Spanner Nut Wrench\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Style:\u003c\/strong\u003e Fixed Square\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Powder Coated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.92 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions:\u003c\/strong\u003e 4.064 x 39.116 x 14.986 centimeters\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282245078\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e United States\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Mercruiser Specialty Tools\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMC-I drive units\u003c\/li\u003e\n\u003cli\u003eR-MR drive units\u003c\/li\u003e\n\u003cli\u003eBlackhawk drive units\u003c\/li\u003e\n\u003cli\u003eAll Bravo drive units\u003c\/li\u003e\n\u003cli\u003eAll Alpha drive units\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury Marine 91-17256\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-9803 Spanner Nut Wrench used for?\u003c\/strong\u003e It removes and installs the driveshaft bearing retainer on MC-I, R-MR, Blackhawk, all Bravo, and all Alpha stern drive units, making it the correct tool for driveshaft bearing service on those drives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-9803 wrench fit Alpha One drive units?\u003c\/strong\u003e Yes, the Sierra 18-9803 is designed to work on all Alpha drive units, along with MC-I, R-MR, Blackhawk, and all Bravo units.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the Sierra 18-9803 replace?\u003c\/strong\u003e Mercury Marine 91-17256 is the OEM number that the Sierra 18-9803 Spanner Nut Wrench replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-9803 spanner nut wrench weigh?\u003c\/strong\u003e The Sierra 18-9803 weighs 1.92 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color and finish does this wrench have?\u003c\/strong\u003e The 18-9803 has a white, powder coated finish for corrosion resistance in marine service environments.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat head style does the 18-9803 use?\u003c\/strong\u003e A fixed square head style is used on the Sierra 18-9803, which engages the driveshaft bearing retainer without slipping.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-9803 a genuine OEM tool or aftermarket?\u003c\/strong\u003e The 18-9803 is a Sierra aftermarket tool built to meet or exceed the performance of the Mercury Marine 91-17256 retainer wrench it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use a regular wrench instead of the 18-9803 for retainer removal?\u003c\/strong\u003e The driveshaft bearing retainer on MC-I, R-MR, Blackhawk, Bravo, and Alpha drive units requires a purpose-built spanner like the Sierra 18-9803 to engage it properly without damaging the retainer or housing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is the Sierra 18-9803 manufactured?\u003c\/strong\u003e The Sierra 18-9803 Spanner Nut Wrench is manufactured in the United States.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-9803?\u003c\/strong\u003e The order includes one Sierra 18-9803 Spanner Nut Wrench with a fixed square head, ready to remove or install the driveshaft bearing retainer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-9803 work on Bravo drive units specifically?\u003c\/strong\u003e Yes, the Sierra 18-9803 is compatible with all Bravo drive units in addition to MC-I, R-MR, Blackhawk, and all Alpha units.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988437741787,"sku":"SIE-18-9803","price":96.31,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-9803_lg__15295.1558133280.500.750.jpg?v=1785188872","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-9803-spanner-nut-wrench-for-mercruiser-alpha-bravo-mc-i-r-mr-and-blackhawk-drives-replaces-91-17256","provider":"Good Vibes Marina","version":"1.0","type":"link"}