{"product_id":"merc-463","title":"Mercury Mariner Water Pump Housing Insert 70977","description":"\u003cp\u003eMercury 70977 is a genuine OEM \u003cstrong\u003ewater pump housing insert\u003c\/strong\u003e used in older Mercury and Mariner outboard lower-unit water pump assemblies. Current Mercury dealer references show \u003cstrong\u003e70977\u003c\/strong\u003e superseded to \u003cstrong\u003e70977T\u003c\/strong\u003e, and current model-specific parts diagrams identify the active part as \u003cstrong\u003eINSERT, WATER PUMP HOUSING\u003c\/strong\u003e in the gear housing \/ driveshaft service area.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Mercury Marine OEM part number \u003cstrong\u003e70977\u003c\/strong\u003e, superseded to \u003cstrong\u003e70977T\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eCurrent application references identify it as \u003cstrong\u003eINSERT, WATER PUMP HOUSING\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eUsed in the lower-unit \u003cstrong\u003egear housing \/ driveshaft\u003c\/strong\u003e water pump assembly.\u003c\/li\u003e\n\u003cli\u003eCurrent dealer shipping specs for \u003cstrong\u003e70977\u003c\/strong\u003e are approximately \u003cstrong\u003e0.02 lb\u003c\/strong\u003e, \u003cstrong\u003e1.25 in. x 1.25 in. x 0.75 in.\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eCurrent dealer shipping specs for \u003cstrong\u003e70977T\u003c\/strong\u003e are approximately \u003cstrong\u003e0.03 lb\u003c\/strong\u003e, \u003cstrong\u003e1.13 in. x 1.13 in. x 0.83 in.\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eEngine Compatibility\u003c\/h2\u003e\n\u003cp\u003eThe strongest supportable fitment for 70977 \/ 70977T is older \u003cstrong\u003eMercury and Mariner outboard\u003c\/strong\u003e gear housing water pump service. Current Mercury dealer where-used references connect it to a broad range of smaller and mid-range outboards including \u003cstrong\u003e3.5 HP, 3.6 HP, 4 HP, 4.5 HP, 7.5 HP, 9.8 HP, 40 HP, 45 HP, 75 HP, and 110 HP\u003c\/strong\u003e model families across listed serial ranges.\u003c\/p\u003e\n\u003ch2\u003eSerial Number Fitment Notice\u003c\/h2\u003e\n\u003cp\u003eVerify fitment by exact \u003cstrong\u003eoutboard serial number\u003c\/strong\u003e and the correct \u003cstrong\u003egear housing \/ water pump parts diagram\u003c\/strong\u003e before ordering. This insert appears across many older Mercury and Mariner lower units, so serial-based confirmation is the safest way to match the correct pump service part.\u003c\/p\u003e\n\u003ch2\u003eWhen This Part Needs Replacement\u003c\/h2\u003e\n\u003cp\u003eReplace this insert when the water pump housing service area shows wear, distortion, heat damage, or deterioration during an impeller rebuild. Because it is part of the water pump housing stack, replacing a worn insert during pump service is often the better repair than reusing a damaged component. This is a practical service inference supported by its documented role in the water pump housing assembly.\u003c\/p\u003e\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cp\u003eInstall this part only after confirming the correct Mercury or Mariner lower-unit diagram for the outboard being serviced. Current parts diagrams show the insert used with related water pump parts such as the \u003cstrong\u003eimpeller\u003c\/strong\u003e, \u003cstrong\u003eface plate\u003c\/strong\u003e, \u003cstrong\u003ewater pump cover assembly\u003c\/strong\u003e, \u003cstrong\u003ewater pump cover seal\u003c\/strong\u003e, and \u003cstrong\u003eimpeller drive key \/ pin\u003c\/strong\u003e, so it should be matched to the correct pump stack during reassembly.\u003c\/p\u003e\n\u003ch2\u003eAlternate\/Superseded Part Numbers\u003c\/h2\u003e\n\u003cp\u003eCurrent references show \u003cstrong\u003e70977T\u003c\/strong\u003e as the active replacement for \u003cstrong\u003e70977\u003c\/strong\u003e. Related cross-reference sources also associate \u003cstrong\u003e46894\u003c\/strong\u003e and Sierra \u003cstrong\u003e18-3113\u003c\/strong\u003e with this insert-cup \/ water pump insert application.\u003c\/p\u003e\n\u003ch2\u003eParts Desk Insight\u003c\/h2\u003e\n\u003cp\u003eWith water pump parts like this, the important match is the \u003cstrong\u003eexact lower-unit pump layout\u003c\/strong\u003e. Small pump inserts can look interchangeable, but checking the serial-number-based gear housing diagram first is the best way to avoid getting the wrong water pump housing piece.\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":43563869896740,"sku":"70977","price":10.35,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/b2391de1-2aec-4f8d-9eb0-4872bb4433e6.png?v=1776967201","url":"https:\/\/marisolmarine.com\/products\/merc-463","provider":"Marisol Marine Company","version":"1.0","type":"link"}