{"product_id":"default-57","title":"Mercury MerCruiser Heat Exchanger to Port Elbow Hose 32-864543","description":"\u003ch2\u003eMercury MerCruiser Heat Exchanger to Port Elbow Hose 32-864543\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e 32-864543 (bare ref: 864543)\u003cbr\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mercury \/ Quicksilver\u003cbr\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Molded Cooling Hose (OEM)\u003cbr\u003e\n\u003cstrong\u003eSystem:\u003c\/strong\u003e Closed-Cooling \/ Freshwater-Cooled Exhaust Circuit\u003cbr\u003e\n\u003cstrong\u003ePosition:\u003c\/strong\u003e Heat exchanger outlet to port-side exhaust elbow\u003cbr\u003e\n\u003cstrong\u003eGTIN \/ UPC:\u003c\/strong\u003e 745061559226\u003cbr\u003e\n\u003cstrong\u003eQuantity Required:\u003c\/strong\u003e 1 per engine\u003cbr\u003e\n\u003cstrong\u003eApproximate Weight:\u003c\/strong\u003e 300 g\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eWhat This Part Does\u003c\/h3\u003e\n\u003cp\u003eThe 32-864543 is a genuine OEM molded hose that connects the heat exchanger outlet to the port-side exhaust elbow in selected MerCruiser closed-cooling (freshwater-cooled) inboard engines. It is a position-specific molded hose — the corresponding starboard-side connection uses a different part number and is not interchangeable with this hose.\u003c\/p\u003e\n\n\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\n\u003cp\u003eConfirm your engine model and serial number before ordering. Mercury used several different molded hoses across the closed-cooling circuit, and hose routing varies by engine configuration.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMerCruiser 5.7L MPI Horizon MIE\u003c\/li\u003e\n\u003cli\u003eMerCruiser 6.2L MPI Horizon MIE\u003c\/li\u003e\n\u003cli\u003eMerCruiser 350 MAG MPI Horizon MIE\u003c\/li\u003e\n\u003cli\u003eMerCruiser MX 6.2L MPI Horizon MIE\u003c\/li\u003e\n\u003cli\u003eMerCruiser 383 MAG Stroker Inboard\u003c\/li\u003e\n\u003cli\u003eMerCruiser 357 Horizon Inboard (remanufactured applications)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSerial Number Notice\u003c\/h3\u003e\n\u003cp\u003eDo not order by hose appearance alone. Mercury uses multiple molded hoses in the same closed-cooling circuit — each with a specific routing and connection point. Confirm by engine serial number and diagram position. Do not confuse 32-864543 with:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/11167577145380\"\u003e32-864544 — Heat Exchanger to Starboard Elbow\u003c\/a\u003e (different side)\u003c\/li\u003e\n\u003cli\u003e32-864886 — Heat Exchanger to Circulating Pump\u003c\/li\u003e\n\u003cli\u003e32-863611 — Sea Pump to Transmission Cooler\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhen to Replace\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCracking, surface checking, or hardened rubber\u003c\/li\u003e\n\u003cli\u003eSoft, swollen, or spongy areas along the hose body\u003c\/li\u003e\n\u003cli\u003eLeakage at either connection point\u003c\/li\u003e\n\u003cli\u003eChafing, abrasion, or distortion at clamp locations\u003c\/li\u003e\n\u003cli\u003eInternal collapse or restriction suspected\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eInspect closed-cooling hoses whenever the heat exchanger or exhaust elbows are serviced. Replace as a set with the starboard-side hose if the engine has high hours or either hose shows age-related deterioration.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eInspect the heat-exchanger outlet fitting, port exhaust elbow connection, and hose clamps during replacement\u003c\/li\u003e\n\u003cli\u003eEnsure the hose is fully seated at both ends and correctly routed\u003c\/li\u003e\n\u003cli\u003eKeep the hose clear of hot surfaces and moving components\u003c\/li\u003e\n\u003cli\u003eTighten clamps to the torque specified in the Mercury service manual\u003c\/li\u003e\n\u003cli\u003eAfter installation, run the engine to operating temperature and inspect the full cooling circuit for leaks\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePart Number Cross-Reference\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent OEM:\u003c\/strong\u003e 32-864543\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBare Reference:\u003c\/strong\u003e 864543\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eNote: Mercury diagrams also list 864953 and 864973 at the same heat-exchanger-to-port-elbow diagram position on certain configurations. These are not universal replacements for 32-864543 — confirm against your engine serial number and diagram before ordering.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBest use case:\u003c\/strong\u003e Order 32-864543 when you have confirmed port-side elbow hose failure on a MerCruiser closed-cooling inboard and have matched the part number to your engine diagram. It is most commonly replaced during heat exchanger service or when the engine is pulled for elbow inspection.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCommon issues:\u003c\/strong\u003e The most frequent ordering mistake is confusing the port-side hose (32-864543) with the starboard-side hose (\u003ca href=\"\/products\/11167577145380\"\u003e32-864544\u003c\/a\u003e) — they look similar but route to different sides of the engine. Always identify port vs. starboard before ordering. A second common issue is ordering only one hose when both sides show the same age and deterioration — if one is cracked, the other is likely close behind.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Parts\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/11167577145380\"\u003eMercury MerCruiser Heat Exchanger to Starboard Elbow Hose 32-864544\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/11167580323876\"\u003eMerCruiser Cooling Hose 864509 — Thermostat Housing to Lower Manifold\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/11167580553252\"\u003eMercury MerCruiser Cooling Hose 32-864552\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"MERC","offers":[{"title":"Default Title","offer_id":51324674080804,"sku":"32-864543","price":78.74,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/88506064-75cd-4070-8e71-977615e0726f.png?v=1788660365","url":"https:\/\/marisolmarine.com\/products\/default-57","provider":"Marisol Marine Company","version":"1.0","type":"link"}