Mercury MerCruiser Quicksilver Heat Exchanger to Starboard Elbow Hose 32-864544 32-864544
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Mercury MerCruiser Heat Exchanger to Starboard Elbow Hose — Closed Cooling
Part Number: 32-864544 | Base Number: 864544 | GTIN: 745061559219
Brand: Mercury / MerCruiser | Type: Molded Closed-Cooling Hose
Genuine Mercury MerCruiser OEM molded hose connecting the heat exchanger to the starboard exhaust elbow on selected closed-cooled MerCruiser V8 MPI Horizon MIE V-drive inboard engines. Designed for V-drive installations with no risers or 3-inch warm-riser configurations.
Compatible Applications
- MerCruiser 350 MAG MPI Horizon MIE — V-drive, no-riser and 3-inch warm-riser configurations
- MerCruiser 5.7L MPI Horizon MIE — V-drive
- MerCruiser 6.2L MPI Horizon MIE — V-drive
- MerCruiser MX 6.2L MPI Horizon MIE — V-drive
- MerCruiser 383 MAG Stroker — selected inboard / reman applications
- MerCruiser 357 Horizon — selected reman applications
Fitment depends on engine model, drive configuration, riser height, and serial number. For 350 MAG MPI Horizon MIE, serial break 0M390000 may affect which hose applies. Engines with 6-inch risers use a different hose. Always verify using the Mercury closed-cooling system diagram for the exact engine and configuration.
Installation Location
Connects the heat exchanger outlet to the starboard exhaust elbow in the closed-cooling circuit. This is the starboard-side V-drive hose — not the port-side hose (32-864543) or the 6-inch-riser starboard hose (32-864974).
When This Hose Needs Replacement
Replace when the hose is cracked, hardened, swollen, internally deteriorated, leaking, or shows damage around the hose-clamp contact areas. Inspect all closed-cooling hoses whenever the heat exchanger or exhaust elbow is serviced.
Installation Notes
Drain or isolate the closed-cooling system before removal. Inspect the heat-exchanger outlet fitting, starboard elbow connection, hose clamps, and adjacent hoses before installing the replacement. Route the hose without twisting or kinking and confirm the system is leak-free after refilling and running the engine to operating temperature.
Alternate & Related Part Numbers
- Mercury / MerCruiser OEM: 32-864544
- Base number: 864544
- Related port-side V-drive hose: 32-864543
- Related 6-inch-riser starboard hose: 32-864974
- GTIN: 745061559219
Parts Desk Insights
The critical fitment identifiers for 32-864544 are closed cooling, V-drive, and heat exchanger to starboard elbow. Similar MerCruiser engines use different hoses for inline drives, port-side connections, and 6-inch-riser configurations — matching the closed-cooling system diagram is essential. A common mistake is selecting a hose by engine displacement alone without confirming drive type and riser height. If the customer is unsure of their riser configuration, have them measure riser height or check the engine tag before ordering.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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