{"product_id":"water-pump-repair-kit-fits-mercury-mariner-outboards-30-70-hp-replaces-77177a3","title":"Water Pump Repair Kit – Fits Mercury \u0026 Mariner Outboards 30-70 HP (Replaces 77177A3)","description":"\u003ch2\u003eWater Pump Repair Kit – Fits Mercury \u0026amp; Mariner Outboards 30-70 HP (Replaces 77177A3)\u003c\/h2\u003e\n\u003cp\u003eThis comprehensive water pump repair kit is designed for Mercury and Mariner 2-cycle outboards from \u003cstrong\u003e30 HP through 70 HP\u003c\/strong\u003e, manufactured between 1977 and 1997. It provides all necessary components for a complete and reliable water pump service.\u003c\/p\u003e\n\u003cp\u003eThis kit is a direct replacement for multiple OEM and aftermarket part numbers, ensuring broad compatibility for the specified engine models.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eIncludes key components such as the impeller, housing, face plate, and all required gaskets and seals.\u003c\/li\u003e\n\u003cli\u003eEngineered to meet or exceed original equipment specifications for performance and longevity.\u003c\/li\u003e\n\u003cli\u003eInstallation requires the removal of the lower unit.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Cross-Reference\u003c\/h2\u003e\n\u003cp\u003eUse this table to confirm equivalent part numbers across OEM and aftermarket brands.\u003c\/p\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable\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\u003e46-77177A3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\u003c\/td\u003e\n\u003ctd\u003e77177A3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSierra\u003c\/td\u003e\n\u003ctd\u003e18-3324\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGLM\u003c\/td\u003e\n\u003ctd\u003e12100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMallory\u003c\/td\u003e\n\u003ctd\u003e9-48312\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eCompatible Engine Models\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model\/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial\/model: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/mercury-outboard-serial-number-guide\" rel=\"nofollow noopener\" target=\"_blank\"\u003eMercury Serial Number Guide\u003c\/a\u003e. You can also review exploded diagrams to verify part numbers: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/diagrams\/mercury-parts-catalog\" rel=\"nofollow noopener\" target=\"_blank\"\u003eMercury Parts Diagrams \u0026amp; Catalog\u003c\/a\u003e.\u003c\/p\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eRated HP\u003c\/th\u003e\n\u003cth\u003eStroke\u003c\/th\u003e\n\u003cth\u003eYears\u003c\/th\u003e\n\u003cth\u003eOEM Part No.\u003c\/th\u003e\n\u003cth\u003eNotes\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\u003eJet\u003c\/td\u003e\n\u003ctd\u003e30\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1989-1997\u003c\/td\u003e\n\u003ctd\u003e77177A3\u003c\/td\u003e\n\u003ctd\u003e4 cylinders (USA 0C159200-0G589999)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003e35\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1984-1989\u003c\/td\u003e\n\u003ctd\u003e77177A3\u003c\/td\u003e\n\u003ctd\u003e2 cylinders\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1978-1983\u003c\/td\u003e\n\u003ctd\u003e77177A3\u003c\/td\u003e\n\u003ctd\u003e2 cylinders (USA 4860103 \u0026amp; below, BEL 9184451 \u0026amp; below)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003e40\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1989-Up\u003c\/td\u003e\n\u003ctd\u003e77177A3\u003c\/td\u003e\n\u003ctd\u003e4 cylinders\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003e45\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1986-Up\u003c\/td\u003e\n\u003ctd\u003e77177A3\u003c\/td\u003e\n\u003ctd\u003e4 cylinders\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1978-1985\u003c\/td\u003e\n\u003ctd\u003e77177A3\u003c\/td\u003e\n\u003ctd\u003e4 cylinders (USA 5531630 \u0026amp; above)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003e50\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1984-1990\u003c\/td\u003e\n\u003ctd\u003e77177A3\u003c\/td\u003e\n\u003ctd\u003e3 cylinders (USA 6428681-0D000749)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1984-1990\u003c\/td\u003e\n\u003ctd\u003e77177A3\u003c\/td\u003e\n\u003ctd\u003e3 cylinders\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003e65\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1976\u003c\/td\u003e\n\u003ctd\u003e77177A3\u003c\/td\u003e\n\u003ctd\u003e3 cylinders\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMercury\/Mariner\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003e70\u003c\/td\u003e\n\u003ctd\u003e2-Stroke\u003c\/td\u003e\n\u003ctd\u003e1977-1983\u003c\/td\u003e\n\u003ctd\u003e77177A3\u003c\/td\u003e\n\u003ctd\u003e3 cylinders (USA 4977157-6428680)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWater Pump Repair Kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInstallation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRequires lower unit removal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHousing Material\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePlastic and metal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e108mm × 102mm × 95mm (4.25\" × 4.00\" × 3.75\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.34 kg (0.75 lb)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 year (varies by manufacturer)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 x Water Pump Impeller (89983T)\u003c\/li\u003e\n\u003cli\u003e1 x Upper Housing\u003c\/li\u003e\n\u003cli\u003e1 x Lower Housing\u003c\/li\u003e\n\u003cli\u003e1 x Face Plate\u003c\/li\u003e\n\u003cli\u003e1 x Face Seal\u003c\/li\u003e\n\u003cli\u003e1 x Seal Carrier\u003c\/li\u003e\n\u003cli\u003e1 x Water Tube Coupling\u003c\/li\u003e\n\u003cli\u003e1 x Drive Key\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color:red;\"\u003eMultiple gaskets (quantity varies by manufacturer)\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisconnect Power:\u003c\/strong\u003e Disconnect the battery cables to prevent accidental starting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePosition the Engine:\u003c\/strong\u003e Tilt the engine up and secure it. Place a drain pan under the lower unit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrain Gear Lube:\u003c\/strong\u003e Remove the upper and lower drain screws from the gearcase and allow the lubricant to drain completely.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemove the Lower Unit:\u003c\/strong\u003e Remove the bolts securing the lower unit to the engine. Carefully lower it from the drive shaft housing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccess the Water Pump:\u003c\/strong\u003e The water pump is located on top of the lower unit. Remove the bolts to disassemble the housing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplace Components:\u003c\/strong\u003e Carefully note the order of all parts. Remove the old impeller, gaskets, seals, and wear plate, and replace them with the new parts from the kit. Lightly grease the new impeller.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReassemble Pump:\u003c\/strong\u003e Reinstall the housing components, ensuring the impeller vanes are oriented correctly (typically by twisting the driveshaft in a clockwise direction). Torque bolts to specification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReinstall Lower Unit:\u003c\/strong\u003e Guide the lower unit back into place, aligning the driveshaft, shift shaft, and water tube. Secure with bolts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRefill Gear Lube:\u003c\/strong\u003e Fill the gearcase with fresh lubricant from the bottom drain hole until it seeps out the top hole. Reinstall and tighten both screws.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest Operation:\u003c\/strong\u003e Reconnect the battery. Start the engine using a water supply (flushing muffs) and check for a strong, steady stream from the tell-tale outlet.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I confirm this kit fits my specific engine model?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The most reliable method is to match your engine's serial number to the ranges listed in our \"Compatible Engine Models\" table. For Mercury\/Mariner owners, use the linked serial number guide to find your number and confirm it falls within the specified range (e.g., \"USA 0C159200-0G589999\"). Cross-referencing the OEM part number (77177A3) is also a highly effective verification method.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What are the common signs of a failing water pump?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The most common indicators include the engine overheating at idle or low speeds, and a weak or non-existent water stream from the \"tell-tale\" outlet port. A brittle or cracked impeller can no longer pump water effectively, leading to poor engine cooling.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How often should the water pump impeller be replaced?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: For preventative maintenance, it is recommended to replace your water pump impeller and gaskets \u003cstrong\u003eannually or every 100 hours of operation\u003c\/strong\u003e, whichever comes first. This is especially important for boats used in saltwater, as salt can accelerate the degradation of rubber components.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: OEM vs. Aftermarket?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How fast do you ship and how much does it cost?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is your warranty and return policy?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused \u0026amp; in original condition); please see our policy page or reach out for instructions.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eVerify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.\u003c\/li\u003e\n\u003cli\u003eThis product is an aftermarket replacement part and is not an OEM component.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended to ensure safety and optimal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuality Assured:\u003c\/strong\u003e As a trusted manufacturer for over 20 years, we supply top marine brands globally.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Global Shipping:\u003c\/strong\u003e Free delivery worldwide in 5–15 days.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect from Manufacturer:\u003c\/strong\u003e Competitive pricing without compromising quality.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":50489812418873,"sku":"24KM023","price":51.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/Water_Pump_Impeller_Kit_for_Mercury_Mariner_-_BRP_Johnson_-_Evinrude_18-3324_-_JLM_MARINE-8290082.jpg?v=1755251990","url":"https:\/\/jlmmarine.com\/products\/water-pump-repair-kit-fits-mercury-mariner-outboards-30-70-hp-replaces-77177a3","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}