{"product_id":"arco-ip004-mercruiser-plastic-pump-impeller-kit","title":"Arco IP004 Mercury Replacement Impeller","description":"\u003ch2\u003e\u003cstrong\u003eProduct Description\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe ARCO IP004 is a premium replacement seawater-pump impeller kit for compatible Mercury MerCruiser engines using the older \u003cstrong\u003etwo-piece plastic raw-water pump body\u003c\/strong\u003e. It replaces Mercury impeller assembly \u003cstrong\u003e46-72774A89\u003c\/strong\u003e and Sierra \u003cstrong\u003e18-3155\u003c\/strong\u003e, restoring the pump's ability to draw cooling water through the engine's raw-water cooling system.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eARCO part number: \u003cstrong\u003eIP004\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eReplacement impeller for Mercury MerCruiser applications\u003c\/li\u003e\n\u003cli\u003eDesigned for the \u003cstrong\u003etwo-piece plastic seawater pump\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eReplaces Mercury \u003cstrong\u003e46-72774A89\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eCross-references Sierra \u003cstrong\u003e18-3155\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eNew premium replacement component\u003c\/li\u003e\n\u003cli\u003eUPC \/ GTIN: \u003cstrong\u003e693006030166\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003ePump and Engine Compatibility\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe ARCO IP004 is intended for Mercury MerCruiser installations equipped with the plastic two-piece seawater pump body. This pump style is commonly associated with older belt-driven MerCruiser raw-water pump systems, including compatible Bravo-drive engine installations.\u003c\/p\u003e\n\u003cp\u003eThe exact engine model should not be used as the only fitment check. Confirm that the installed pump is the two-piece plastic-body design and that the original impeller assembly matches Mercury \u003cstrong\u003e46-72774A89\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eFitment Notice\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eBefore ordering, verify:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe pump has a \u003cstrong\u003etwo-piece plastic housing\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eThe original impeller or service-kit number is \u003cstrong\u003e46-72774A89\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eThe application cross-references Sierra \u003cstrong\u003e18-3155\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eThe existing pump is not the later brass-body seawater pump\u003c\/li\u003e\n\u003cli\u003eThe shaft, housing and cover are still serviceable\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eDo not confuse the IP004 with an impeller intended for the later one-piece brass MerCruiser pump. The pump-body construction is the fastest and most reliable visual distinction. If the housing is worn or damaged, consider replacing the complete pump with the \u003ca href=\"\/products\/arco-wp004-mercruiser-replacement-water-pump\"\u003eARCO WP004\u003c\/a\u003e instead.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eWhen This Part Needs Replacement\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eReplace the impeller when:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eExhaust-water discharge becomes weak\u003c\/li\u003e\n\u003cli\u003eEngine temperature rises under load\u003c\/li\u003e\n\u003cli\u003eThe pump becomes difficult to prime\u003c\/li\u003e\n\u003cli\u003eThe blades are cracked, hardened or permanently bent\u003c\/li\u003e\n\u003cli\u003eBlade tips are torn or missing\u003c\/li\u003e\n\u003cli\u003eThe pump has operated dry\u003c\/li\u003e\n\u003cli\u003eThe boat has been stored for an extended period\u003c\/li\u003e\n\u003cli\u003ePreventive annual cooling-system service is due\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA damaged impeller can shed blade fragments into hoses, coolers and heat exchangers, so missing pieces should be located before the engine returns to service.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eInstallation Notes\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDisconnect the battery and allow the engine to cool.\u003c\/li\u003e\n\u003cli\u003eClose the raw-water intake seacock.\u003c\/li\u003e\n\u003cli\u003eRemove the pump cover and old impeller.\u003c\/li\u003e\n\u003cli\u003eAvoid prying against the plastic pump housing.\u003c\/li\u003e\n\u003cli\u003eInspect the two-piece body, wear surfaces, shaft and cover.\u003c\/li\u003e\n\u003cli\u003eRetrieve any missing blade fragments from downstream cooling components.\u003c\/li\u003e\n\u003cli\u003eLubricate the new impeller with a suitable installation lubricant.\u003c\/li\u003e\n\u003cli\u003eAlign the hub carefully with the pump shaft.\u003c\/li\u003e\n\u003cli\u003eReplace the associated seals, O-ring or wear components as required by the pump service procedure.\u003c\/li\u003e\n\u003cli\u003eReassemble the pump evenly to avoid distorting the plastic housing.\u003c\/li\u003e\n\u003cli\u003eRestore the water supply and verify strong cooling-water discharge immediately after startup.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWhere the housing is cracked, distorted or deeply scored, replacing the complete pump may be more reliable than fitting an impeller alone.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eAlternate \/ Cross-Reference Part Numbers\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eARCO: \u003cstrong\u003eIP004\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eMercury MerCruiser: \u003cstrong\u003e46-72774A89\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eSierra: \u003cstrong\u003e18-3155\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eUPC \/ GTIN: \u003cstrong\u003e693006030166\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eCompatible \u0026amp; Related Parts\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eWhen servicing the MerCruiser two-piece plastic seawater pump, consider these related parts:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/arco-wp004-mercruiser-replacement-water-pump\"\u003eARCO WP004 MerCruiser Replacement Water Pump\u003c\/a\u003e – complete two-piece V-belt pump assembly (replace when housing is worn)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/mercury-mercruiser-quicksilver-body-impeller-kit-807151a14\"\u003eMercury MerCruiser Quicksilver Body\/Impeller Kit 807151A14\u003c\/a\u003e – OEM plastic pump body and impeller kit\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/sierra-marine-water-pump-kit-18-3150-mercruiser-bravo-trs-complete-cooling-system-rebuild\"\u003eSierra Marine Water Pump Kit 18-3150\u003c\/a\u003e – MerCruiser Bravo \/ TRS complete cooling system rebuild kit\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/mercury-mercruiser-seawater-pump-impeller-kit-8m0137219\"\u003eMercury MerCruiser Seawater Pump Impeller Kit 8M0137219\u003c\/a\u003e – OEM impeller kit (brass pump variant)\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/arco-wp001-mercruiser-brass-seawater-pump\"\u003eARCO WP001 MerCruiser Brass Seawater Pump\u003c\/a\u003e – later brass-body pump (if upgrading from plastic)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eParts Desk Insight\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe critical identifier for the IP004 is the \u003cstrong\u003eplastic two-piece pump body\u003c\/strong\u003e. If the engine uses a later brass-body seawater pump, this is not the correct impeller. Matching Mercury \u003cstrong\u003e46-72774A89\u003c\/strong\u003e or Sierra \u003cstrong\u003e18-3155\u003c\/strong\u003e provides the safest confirmation.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51156140490788,"sku":"57-IP004","price":281.49,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/519c0add-9cbc-476e-a9dd-81099ea8619d.png?v=1785208057","url":"https:\/\/marisolmarine.com\/products\/arco-ip004-mercruiser-plastic-pump-impeller-kit","provider":"Marisol Marine Company","version":"1.0","type":"link"}