{"product_id":"sierra-18-1118-drive-shaft-tapered-roller-bearing-race-set-replaces-mercury-31-42677a1-mercury-mariner-outboard-gearcase","title":"Sierra 18-1118 Drive Shaft Tapered Roller Bearing for Mercury\/Mariner 100 HP (4 Cyl.) Outboards","description":"\u003cp\u003eThe Sierra 18-1118 is a tapered roller bearing designed to support the drive shaft in the gearcase of Mercury and Mariner outboard motors. This bearing is built as a direct-fit replacement for the drive shaft position in the lower unit, where it carries radial and thrust loads generated by the drive shaft as it transmits power from the powerhead down to the gearcase. Tapered roller bearings of this type are chosen for drive shaft applications because they handle combined axial and radial loads more effectively than ball bearings, which is important given the constant load reversals a drive shaft experiences during shifting and throttle changes.\u003c\/p\u003e\u003cp\u003eThe 18-1118 is intended for Mercury\/Mariner 100 hp (4 cylinder) outboards with serial number B209468 and up. It is lubricated with marine gearcase grease and is sized to fit the compact dimensions of the outboard's lower unit drive shaft bore. As a wear item inside the gearcase, this bearing is typically replaced during a gearcase rebuild, when a drive shaft is replaced, or when diagnosing gearcase noise or play that points to a worn bearing.\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 18-1118\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Drive Shaft Tapered Roller Bearing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBearing Type:\u003c\/strong\u003e Tapered Roller Bearing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Lubricant:\u003c\/strong\u003e Grease\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.69 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999974259\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury\/Mariner 100 hp (4 cylinder) outboards, serial number B209468 and up\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-1118 used for?\u003c\/strong\u003e The Sierra 18-1118 is a tapered roller bearing that supports the drive shaft inside the gearcase of Mercury\/Mariner outboard motors, carrying the radial and thrust loads the drive shaft generates during operation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich outboards does the 18-1118 fit?\u003c\/strong\u003e This bearing fits Mercury\/Mariner 100 hp (4 cylinder) outboards with serial number B209468 and up.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-1118 a ball bearing or a roller bearing?\u003c\/strong\u003e It is a tapered roller bearing, which is better suited than a ball bearing to the combined radial and thrust loads a drive shaft puts on the gearcase.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat lubricant should be used with this bearing?\u003c\/strong\u003e The Sierra 18-1118 is designed to run on marine gearcase grease as its compatible lubricant.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-1118 bearing?\u003c\/strong\u003e The Sierra 18-1118 measures 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-1118 weigh?\u003c\/strong\u003e It weighs 0.69 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many bearings come in a package?\u003c\/strong\u003e The 18-1118 is sold as a single drive shaft bearing, one unit count per package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should this drive shaft bearing be replaced?\u003c\/strong\u003e A drive shaft bearing like the 18-1118 is typically replaced during a gearcase rebuild, when the drive shaft itself is replaced, or when gearcase noise or play indicates a worn bearing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-1118 an OEM part or an aftermarket replacement?\u003c\/strong\u003e The 18-1118 is a Sierra-branded aftermarket drive shaft bearing made to fit the specified Mercury\/Mariner outboard application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-1118 fit outboards below serial number B209468?\u003c\/strong\u003e No, the listed fitment for the 18-1118 is Mercury\/Mariner 100 hp (4 cylinder) units with serial number B209468 and up; earlier serial numbers are not covered by this part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-1118?\u003c\/strong\u003e The UPC for the Sierra 18-1118 drive shaft bearing is 030999974259.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988086960347,"sku":"SIE-18-1118","price":39.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-1118_lg__69818.1558120422.500.750.jpg?v=1785188444","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-1118-drive-shaft-tapered-roller-bearing-race-set-replaces-mercury-31-42677a1-mercury-mariner-outboard-gearcase","provider":"Good Vibes Marina","version":"1.0","type":"link"}