{"product_id":"crusader-heat-exchanger-5-7l-6-0l-full-fwc-ra147048","title":"Crusader Heat Exchanger 5.7L–6.0L | Full Freshwater Cooling | OEM Part RA147048","description":"\u003ch2\u003eCrusader Heat Exchanger 5.7L–6.0L — Full Freshwater Cooling | OEM Part RA147048\u003c\/h2\u003e\n\n\u003cp\u003eGenuine Crusader OEM heat exchanger assembly for the full freshwater cooling (FWC) system on compatible Crusader 5.7L and 6.0L marine inboard engines. In a freshwater cooling system, the heat exchanger replaces raw water circulation through the engine block with a closed loop of treated freshwater, using raw water only to cool the freshwater circuit through the heat exchanger core. This significantly reduces internal corrosion and extends engine life, particularly in saltwater and brackish water environments.\u003c\/p\u003e\n\n\u003cp\u003eRA147048 is the full FWC heat exchanger assembly for compatible 5.7L and 6.0L Crusader engines. Confirm fitment by engine model and serial number before ordering.\u003c\/p\u003e\n\n\u003ch2\u003ePart Information\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e RA147048\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Crusader\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOfficial Product Type:\u003c\/strong\u003e Heat Exchanger — Full Freshwater Cooling (FWC) Assembly\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Displacement:\u003c\/strong\u003e 5.7L \/ 6.0L\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem:\u003c\/strong\u003e Closed Cooling — Freshwater Cooling Circuit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCooling Type:\u003c\/strong\u003e Full FWC (freshwater-cooled engine block and heads)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatible Applications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCrusader 5.7L marine inboard engines with full freshwater cooling where RA147048 is specified\u003c\/li\u003e\n\u003cli\u003eCrusader 6.0L marine inboard engines with full freshwater cooling where RA147048 is specified\u003c\/li\u003e\n\u003cli\u003eAlways confirm fitment by engine model, serial number, and parts diagram before ordering — heat exchanger specifications vary by engine family and cooling system configuration\u003c\/li\u003e\n\u003cli\u003eThis part is for \u003cstrong\u003efull FWC systems only\u003c\/strong\u003e — not for raw water cooled engines\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSerial Number \u0026amp; Fitment Notice\u003c\/h2\u003e\n\u003cp\u003eConfirm fitment using your Crusader engine serial number and the corresponding parts diagram. Heat exchanger specifications vary by engine generation and cooling system configuration. Confirm that your engine is equipped with a full freshwater cooling system before ordering.\u003c\/p\u003e\n\n\u003ch2\u003eFreshwater Cooling System Overview\u003c\/h2\u003e\n\u003cp\u003eIn a full freshwater cooling system, the engine block and cylinder heads are cooled by a closed loop of treated freshwater rather than raw water. The heat exchanger transfers heat from the freshwater circuit to raw water, which is then discharged overboard. This arrangement prevents raw water from contacting internal engine surfaces, dramatically reducing corrosion and scale buildup — particularly important in saltwater and brackish water environments.\u003c\/p\u003e\n\n\u003ch2\u003eWhen to Replace\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eHeat exchanger core is leaking, corroded, or blocked\u003c\/li\u003e\n\u003cli\u003eOverheating caused by reduced heat transfer through a fouled or corroded core\u003c\/li\u003e\n\u003cli\u003eExternal corrosion or physical damage to the heat exchanger housing\u003c\/li\u003e\n\u003cli\u003eCoolant contamination from raw water ingress through a failed core\u003c\/li\u003e\n\u003cli\u003eDuring major engine overhaul or freshwater cooling system rebuild\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eService Interval\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eInspect the heat exchanger core annually for corrosion, fouling, and leaks\u003c\/li\u003e\n\u003cli\u003eFlush and inspect the freshwater cooling circuit at the start and end of each season\u003c\/li\u003e\n\u003cli\u003eReplace coolant per the engine service manual specification — typically every 2 years or as specified\u003c\/li\u003e\n\u003cli\u003eInspect zinc anodes in the heat exchanger (if fitted) annually and replace when depleted\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDrain and flush the freshwater cooling circuit before installation\u003c\/li\u003e\n\u003cli\u003eInspect all cooling hoses, clamps, and fittings and replace as needed — see \u003ca href=\"\/products\/pcm-engine-cooling-hose-assembly-97310\"\u003ePCM Engine Cooling Hose Assembly 97310\u003c\/a\u003e and \u003ca href=\"\/products\/pcm-engine-cooling-elbow-97387\"\u003ePCM Engine Cooling Elbow 97387\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eReplace the thermostat with the correct closed-cooling specification — see \u003ca href=\"\/products\/pcm-thermostat-170f-closed-cooling-r026007\"\u003ePCM Thermostat 170°F Closed Cooling R026007\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eRefill with the correct coolant type and concentration per the Crusader service manual\u003c\/li\u003e\n\u003cli\u003eRun the engine and inspect all connections for leaks while verifying normal operating temperature\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTechnical FAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between full FWC and partial FWC?\u003c\/strong\u003e\u003cbr\u003eA full freshwater cooling system circulates treated freshwater through the entire engine — block, heads, and exhaust manifolds. A partial FWC system cools only the block and heads, while the exhaust manifolds remain raw water cooled. RA147048 is for full FWC configurations. Confirm your engine’s cooling system type before ordering.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this engine require a different thermostat for closed cooling?\u003c\/strong\u003e\u003cbr\u003eYes. Freshwater cooled engines use a higher-temperature thermostat than raw water cooled engines. The correct thermostat for PCM\/Crusader closed cooling applications is the \u003ca href=\"\/products\/pcm-thermostat-170f-closed-cooling-r026007\"\u003ePCM 170°F Closed Cooling Thermostat R026007\u003c\/a\u003e, not the 143°F raw water thermostat.\u003c\/p\u003e\n\n\u003ch2\u003eParts Desk Insights\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBest Use Case:\u003c\/strong\u003e RA147048 is the correct OEM heat exchanger for Crusader 5.7L and 6.0L owners replacing a failed or corroded heat exchanger in an existing full FWC installation, or for those completing a freshwater cooling system rebuild. It is particularly well-suited for saltwater and brackish water applications where the freshwater cooling system provides the greatest protection against internal engine corrosion.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCommon Customer Issue:\u003c\/strong\u003e The most frequent issue is not confirming whether the engine has a full FWC or partial FWC system before ordering. These are different configurations with different heat exchanger assemblies. Always confirm the cooling system type using the engine serial number and parts diagram before ordering.\u003c\/p\u003e\n\n\u003ch2\u003eRelated Products\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/pcm-thermostat-170f-closed-cooling-r026007\"\u003ePCM Thermostat 170°F Closed Cooling — R026007\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/pcm-engine-cooling-hose-assembly-97310\"\u003ePCM Engine Cooling Hose Assembly — 97310\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/pcm-engine-cooling-elbow-97387\"\u003ePCM Engine Cooling Elbow — 97387\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/pcm-engine-cooling-gasket-97361\"\u003ePCM Engine Cooling System Gasket — 97361\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/pcm-87\"\u003ePCM Tank — R146002\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/crusader-copper-thermostat-housing-98202\"\u003eCrusader Copper Thermostat Housing — 98202\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/crusader-engine-thermostat-143f-r026002e\"\u003eCrusader Thermostat 143°F Raw Water — R026002E\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CRU","offers":[{"title":"Default Title","offer_id":43563781029924,"sku":"RA147048","price":2909.84,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/194781f6-4a98-4647-861c-0785928b42c5.png?v=1787452439","url":"https:\/\/marisolmarine.com\/products\/crusader-heat-exchanger-5-7l-6-0l-full-fwc-ra147048","provider":"Marisol Marine Company","version":"1.0","type":"link"}