{"product_id":"marine-o-ring-1-359-in-i-d-x-139-in-replaces-oem-307239-sierra-18-7170-9-pack-of-5","title":"Sierra Water Pump Base Seal 18-7170-9, Bell Housing Seal for MerCruiser R\/MR\/Alpha I Stern Drives, Pack of 5","description":"\u003cp\u003eThe Sierra Water Pump Base Seal 18-7170-9 is a bell housing oil seal used in the gimbal housing of MerCruiser R\/MR\/Alpha I stern drives. This seal sits at the base of the water pump assembly where the drive shaft passes through the gimbal housing, helping to keep water out of the bell housing area and maintain the seal integrity of the drive unit during operation. It is designed as a direct-fit replacement for the bell housing seal position (BH) on applicable R\/MR\/Alpha I stern drives beginning at serial number 6225577 and up.\u003c\/p\u003e\u003cp\u003eThis seal is sold as an O-ring style component and is priced and packaged per unit of 5, making it a practical option for shops or owners who want spares on hand for routine gimbal housing service or water pump rebuilds. Keeping the bell housing seal in good condition is a key part of preventing water intrusion into the gimbal housing during water pump maintenance, and replacing it whenever the gimbal housing or water pump is serviced is standard practice.\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 18-7170-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Water Pump Base Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeal Type:\u003c\/strong\u003e Bell Housing Seal (BH)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLocation:\u003c\/strong\u003e Gimbal Housing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack Size:\u003c\/strong\u003e Package of 5\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.03 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplicable Stern Drive Model:\u003c\/strong\u003e R\/MR\/Alpha I\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBeginning Serial Number:\u003c\/strong\u003e 6225577 and up\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMerCruiser R\/MR\/Alpha I stern drives, beginning serial number 6225577 and up\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-7170-9 seal used for?\u003c\/strong\u003e The Sierra 18-7170-9 is a bell housing seal that fits into the gimbal housing of a MerCruiser R\/MR\/Alpha I stern drive, sealing the area where the water pump drive shaft passes through the gimbal housing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich stern drives does part 18-7170-9 fit?\u003c\/strong\u003e This seal fits MerCruiser R\/MR\/Alpha I stern drives beginning at serial number 6225577 and up.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many seals come in a package?\u003c\/strong\u003e The 18-7170-9 bell housing seal is sold in a package of 5 units, so you receive 5 seals per order.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-7170-9 seal weigh?\u003c\/strong\u003e Each package of the Sierra 18-7170-9 seal weighs 0.03 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere in the gimbal housing does this seal install?\u003c\/strong\u003e It installs in the bell housing (BH) position within the gimbal housing on applicable MerCruiser R\/MR\/Alpha I stern drives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-7170-9 an OEM or aftermarket part?\u003c\/strong\u003e The 18-7170-9 is a Sierra-branded replacement seal designed to fit the bell housing position on MerCruiser R\/MR\/Alpha I stern drives from serial number 6225577 and up.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should this seal be replaced?\u003c\/strong\u003e This bell housing seal is typically replaced whenever the gimbal housing or water pump on the applicable MerCruiser R\/MR\/Alpha I stern drive is serviced, to maintain a proper seal against water intrusion.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes 18-7170-9 fit any serial number of R\/MR\/Alpha I drives?\u003c\/strong\u003e No, this seal applies to MerCruiser R\/MR\/Alpha I stern drives starting at serial number 6225577 and up; earlier serial numbers are not covered by this part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a rubber O-ring style seal?\u003c\/strong\u003e Yes, the Sierra 18-7170-9 is supplied as an O-ring style seal, packaged 5 per unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I buy the 18-7170-9 seal individually instead of a 5-pack?\u003c\/strong\u003e The 18-7170-9 seal is sold only as a package of 5 units.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988364832987,"sku":"SIE-18-7170-9","price":8.62,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/sierra_lg_1962__08603.1645537262.500.750.jpg?v=1785329191","url":"https:\/\/www.goodvibesmarina.com\/products\/marine-o-ring-1-359-in-i-d-x-139-in-replaces-oem-307239-sierra-18-7170-9-pack-of-5","provider":"Good Vibes Marina","version":"1.0","type":"link"}