{"product_id":"merc-1221","title":"Mercury Outboard Water Pump Impeller 8-Blade - 8M0135803","description":"\u003cp\u003eThe \u003cstrong\u003eMercury Quicksilver 8M0135803\u003c\/strong\u003e is a genuine Mercury Marine OEM \u003cstrong\u003ewater pump impeller\u003c\/strong\u003e used in select Mercury and Mariner portable outboard lower-unit water pump assemblies. The impeller is the flexible-vane component that draws raw water through the gearcase pickup and pumps it up through the cooling system to help regulate engine temperature.\u003c\/p\u003e\n\u003cp\u003eThis impeller is commonly associated with select modern Mercury EFI portable outboards and should be matched by exact engine serial number, horsepower, gearcase style, and factory water pump diagram before ordering.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Mercury Marine OEM water pump impeller.\u003c\/li\u003e\n\u003cli\u003eMercury\/Quicksilver part number: \u003cstrong\u003e8M0135803\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eMercury category-style formatting: \u003cstrong\u003e47-8M0135803\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eUPC \/ GTIN reference: \u003cstrong\u003e745061029514\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eFlexible 8-blade impeller design.\u003c\/li\u003e\n\u003cli\u003eUsed in select portable Mercury outboard water pump assemblies.\u003c\/li\u003e\n\u003cli\u003eHelps maintain proper cooling-water flow to prevent overheating.\u003c\/li\u003e\n\u003cli\u003eImportant replacement part for annual service, weak telltale flow, overheating, or lower-unit pump rebuilds.\u003c\/li\u003e\n\u003cli\u003eSupersedes earlier Mercury impeller references in supported applications.\u003c\/li\u003e\n\u003cli\u003eCross-reference links exist for select Tohatsu\/Nissan applications, but fitment must be confirmed by engine model and parts diagram.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall diameter:\u003c\/strong\u003e 41.11 mm \/ 1.62 in.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeight \/ thickness:\u003c\/strong\u003e 23.51 mm \/ 0.93 in.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShaft insertion diameter:\u003c\/strong\u003e 13.88 mm \/ 0.55 in.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlade count:\u003c\/strong\u003e 8 flexible vanes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication type:\u003c\/strong\u003e raw-water pump impeller\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eService location:\u003c\/strong\u003e lower-unit water pump assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eEngine Compatibility\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eCommon application context includes select Mercury, Mariner, Tohatsu, and Nissan portable outboards where the factory water pump diagram calls for \u003cstrong\u003e8M0135803\u003c\/strong\u003e, including:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSelect \u003cstrong\u003eMercury 15 HP EFI\u003c\/strong\u003e outboards where specified.\u003c\/li\u003e\n\u003cli\u003eSelect \u003cstrong\u003eMercury 20 HP EFI\u003c\/strong\u003e outboards where specified.\u003c\/li\u003e\n\u003cli\u003eSelect \u003cstrong\u003eMercury \/ Mariner 10 HP, 15 HP, and 20 HP EFI\u003c\/strong\u003e configurations where the serial-number parts chart confirms this impeller.\u003c\/li\u003e\n\u003cli\u003eSelect \u003cstrong\u003eMercury 8 HP and 9.9 HP Command Thrust\u003c\/strong\u003e gearcase applications where specified.\u003c\/li\u003e\n\u003cli\u003eSelect \u003cstrong\u003eTohatsu \/ Nissan MFS9.9, MFS15, MFS18, and MFS20\u003c\/strong\u003e applications only where the OEM parts chart confirms the matching impeller reference.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eUse this impeller only where the Mercury, Mariner, Tohatsu, or Nissan parts diagram specifically calls for \u003cstrong\u003e8M0135803\u003c\/strong\u003e, \u003cstrong\u003e47-8M0135803\u003c\/strong\u003e, or a confirmed cross-reference.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eSerial Number Fitment Notice\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eConfirm fitment by outboard serial number, horsepower, gearcase style, water pump housing, driveshaft size, and factory parts diagram before ordering. Mercury portable outboards can use different impellers depending on production range, EFI generation, Command Thrust gearcase, and lower-unit configuration.\u003c\/p\u003e\n\u003cp\u003eCommon serial-number references should be treated as a guide only. Always verify against the exact serial-number parts lookup before installation.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eWhen This Part Needs Replacement\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eReplace the impeller during scheduled water pump service or whenever the engine has weak telltale flow, overheating, poor cooling-water output, melted or deformed pump components, cracked vanes, missing blade pieces, or suspected dry-run damage. It should also be replaced after long storage, debris ingestion, sand or silt operation, or any service where the lower-unit water pump is opened.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eInstallation Notes\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eInspect the water pump cup, wear plate, gaskets, key, pump housing, water tube grommet, and driveshaft sealing area before installing the new impeller. Replace damaged or compressed gaskets and seals rather than reusing them.\u003c\/p\u003e\n\u003cp\u003eLubricate the impeller and pump cup with clean water, soapy water, or the lubricant specified in the service manual during assembly. Install the drive key correctly and rotate the driveshaft in the proper direction while seating the housing so the impeller vanes fold the correct way. After installation, run the outboard on a proper water supply and confirm strong cooling-water flow before returning the engine to service.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eAlternate\/Superseded Part Numbers\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e8M0135803\u003c\/strong\u003e — Mercury\/Quicksilver OEM impeller part number\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e47-8M0135803\u003c\/strong\u003e — Mercury category-style catalog formatting\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e745061029514\u003c\/strong\u003e — UPC \/ GTIN reference\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e47-803748\u003c\/strong\u003e — earlier Mercury reference; verify by serial number and diagram\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e47-803748002\u003c\/strong\u003e — earlier Mercury reference; verify by serial number and diagram\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e47-8M0214944\u003c\/strong\u003e — related\/supersession reference; verify by serial number and diagram\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTohatsu 334-65021-0\u003c\/strong\u003e — cross-reference; verify by model and diagram\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTohatsu 3LD-65021-0\u003c\/strong\u003e — cross-reference; verify by model and diagram\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eRelated Service Parts\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eDepending on the pump condition, service may also require the water pump plate, upper pump housing, lower pump gaskets, drive key, water tube grommet, and complete water pump repair kit. Confirm related parts by engine serial number before ordering.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eParts Desk Insight\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eImpellers should be replaced before they fail. A worn or dry-run impeller can shed vane pieces into the cooling passages and cause overheating even after a new impeller is installed. During service, inspect the full pump stack and confirm the correct gearcase version, especially on EFI and Command Thrust portable models.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShipping:\u003c\/strong\u003e Ships same or next day for fast Canada wide shipping. ⚓\u003c\/p\u003e","brand":"MERC","offers":[{"title":"Default Title","offer_id":43563916722212,"sku":"8M0135803","price":43.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/5cff9872-dea1-476c-81c7-f266faa50e30.png?v=1781295109","url":"https:\/\/marisolmarine.com\/products\/merc-1221","provider":"Marisol Marine Company","version":"1.0","type":"link"}