{"product_id":"arco-wp004-mercruiser-replacement-water-pump","title":"Arco WP004 Mercruiser Replacement Water Pump","description":"\u003ch2\u003e\u003cstrong\u003eProduct Description\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe ARCO WP004 is a complete premium replacement seawater pump for MerCruiser V8 engines equipped with a V-belt and the two-piece raw-water pump arrangement. It restores the circulation of incoming lake or seawater through the engine-cooling system and is supplied as a complete replacement pump rather than an impeller-only service kit. ARCO identifies WP004 as a direct replacement for several legacy MerCruiser and Quicksilver pump assemblies.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eARCO part number: \u003cstrong\u003eWP004\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eComplete replacement raw-water pump assembly\u003c\/li\u003e\n\u003cli\u003eDesigned for MerCruiser V8 engines\u003c\/li\u003e\n\u003cli\u003eFits V-belt-driven, two-piece pump configurations\u003c\/li\u003e\n\u003cli\u003ePremium replacement built to meet or exceed original-equipment standards\u003c\/li\u003e\n\u003cli\u003eFactory-tested before packaging\u003c\/li\u003e\n\u003cli\u003eReplaces multiple MerCruiser, Quicksilver and Sierra pump numbers\u003c\/li\u003e\n\u003cli\u003eARCO Assurance Warranty coverage applies under the manufacturer's published terms.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eEngine Compatibility\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe strongest confirmed application is:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMerCruiser V8 marine engines\u003c\/li\u003e\n\u003cli\u003eV-belt accessory-drive systems\u003c\/li\u003e\n\u003cli\u003eEngines using the older two-piece seawater pump assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBecause MerCruiser V8 cooling arrangements vary by engine generation, accessory-drive layout and serial number, compatibility should be confirmed by matching the existing pump to one of the listed replacement numbers.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eSerial Number Fitment Notice\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eBefore ordering, verify that the engine uses a \u003cstrong\u003eV-belt and two-piece raw-water pump\u003c\/strong\u003e. This pump should not be selected solely by engine displacement, as later serpentine-belt systems and one-piece pump configurations use different assemblies.\u003c\/p\u003e\n\u003cp\u003eMatch the original pump casting, MerCruiser part number or engine serial-number parts diagram to one of the supported references below.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eWhen This Part Needs Replacement\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eReplace the complete pump when:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRaw-water flow remains weak after installing a new impeller\u003c\/li\u003e\n\u003cli\u003eThe housing is internally scored, corroded or worn\u003c\/li\u003e\n\u003cli\u003eThe shaft develops excessive play\u003c\/li\u003e\n\u003cli\u003eThe pump leaks from the shaft seal\u003c\/li\u003e\n\u003cli\u003eThe pulley or bearing becomes noisy\u003c\/li\u003e\n\u003cli\u003eThe pump repeatedly loses prime\u003c\/li\u003e\n\u003cli\u003eEngine temperature rises despite a clear intake and serviceable impeller\u003c\/li\u003e\n\u003cli\u003eThe existing pump assembly is damaged or seized\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003ePersistent cooling problems after impeller replacement can indicate wear in the pump housing, shaft, bearing or sealing surfaces rather than the impeller alone.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eInstallation Notes\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eConfirm the engine serial number and original pump reference before removal.\u003c\/li\u003e\n\u003cli\u003eClose the raw-water intake seacock or otherwise isolate the water supply.\u003c\/li\u003e\n\u003cli\u003eDisconnect the battery before working near the belt drive.\u003c\/li\u003e\n\u003cli\u003eNote the original V-belt routing and pulley alignment.\u003c\/li\u003e\n\u003cli\u003eInspect the belt and cooling hoses while the pump is removed.\u003c\/li\u003e\n\u003cli\u003eReplace deteriorated hoses, clamps or belts during installation.\u003c\/li\u003e\n\u003cli\u003eAlign the pulley carefully with the remaining engine accessories.\u003c\/li\u003e\n\u003cli\u003eSet belt tension according to the MerCruiser service procedure.\u003c\/li\u003e\n\u003cli\u003ePrime the pump and restore the raw-water supply before starting the engine.\u003c\/li\u003e\n\u003cli\u003eCheck immediately for leaks, correct belt tracking and strong exhaust-water discharge.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eProfessional installation is recommended where pulley alignment, belt tension or hose routing is uncertain.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eAlternate \/ Replacement Part Numbers\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe ARCO WP004 replaces:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMerCruiser: \u003cstrong\u003e46-72774A32\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eMerCruiser: \u003cstrong\u003e72774A11\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eMerCruiser: \u003cstrong\u003e73823A7\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eMerCruiser: \u003cstrong\u003e59112A2\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eQuicksilver: \u003cstrong\u003e72774A32\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eSierra: \u003cstrong\u003e18-3600\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 raw-water cooling system, consider these related parts:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/mercury-mercruiser-water-pump-repair-kit-89984t5\"\u003eMercury MerCruiser Water Pump Repair Kit 89984T5\u003c\/a\u003e – impeller and seal service kit\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/mercury-mercruiser-water-pump-wear-plate-8m0180871\"\u003eMercury MerCruiser Water Pump Wear Plate 8M0180871\u003c\/a\u003e – wear plate replacement\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/sierra-marine-water-pump-impeller-kit-18-3077-mercruiser-omc-raw-water-pump-service-kit\"\u003eSierra Marine Water Pump Impeller Kit 18-3077\u003c\/a\u003e – MerCruiser \/ OMC raw-water pump service kit\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/mercury-mercruiser-quicksilver-water-pump-impeller-43026t2\"\u003eMercury MerCruiser Quicksilver Water Pump Impeller 43026T2\u003c\/a\u003e – OEM impeller\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/sierra-3160-1-mercruiser-sea-water-pump-brass\"\u003eSierra 3160-1 MerCruiser Sea Water Pump – Brass\u003c\/a\u003e – alternative pump assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eParts Desk Insight\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe critical fitment detail is not simply “MerCruiser V8.” The WP004 is specifically for the older \u003cstrong\u003eV-belt, two-piece seawater pump setup\u003c\/strong\u003e. Confirm the number on the existing pump or use the engine serial-number diagram before ordering, especially when working on repowered boats or engines with modified accessory drives.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51156140621860,"sku":"57-WP004","price":854.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/e8540d2f-6725-4f0b-9729-d74491678f85.png?v=1785206117","url":"https:\/\/marisolmarine.com\/products\/arco-wp004-mercruiser-replacement-water-pump","provider":"Marisol Marine Company","version":"1.0","type":"link"}