Mercury MerCruiser Heat Exchanger to Starboard Elbow Hose 32-864544
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Mercury MerCruiser Heat Exchanger to Starboard Elbow Hose 32-864544
Part Number: 32-864544 (base ref: 864544)
Brand: Mercury / Quicksilver
Product Type: Molded Closed-Cooling Hose (OEM)
System: Closed-Cooling / Freshwater-Cooled Exhaust Circuit
Position: Heat exchanger outlet to starboard-side exhaust elbow (V-drive, no-riser and 3-inch warm-riser configurations)
GTIN / UPC: 745061559219
Quantity Required: 1 per engine
Approximate Weight: 0.5 lb
What This Part Does
The 32-864544 is a genuine OEM molded hose that connects the heat exchanger outlet to the starboard-side exhaust elbow in selected MerCruiser closed-cooling V-drive inboard engines. It is position- and configuration-specific — the port-side connection and 6-inch-riser configurations each use different part numbers and are not interchangeable with this hose.
Compatible Applications
Fitment depends on engine model, drive configuration, riser height, and serial number. Always verify using the closed-cooling system diagram for your exact engine and configuration.
- MerCruiser 350 MAG MPI Horizon MIE — V-drive, no-riser and 3-inch warm-riser configurations (serial break 0M390000 may apply)
- 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
Engines with 6-inch risers use a different hose (32-864974). Confirm riser height and drive type before ordering.
Serial Number Notice
Do not order by engine displacement or appearance alone. Mercury uses multiple molded hoses across the same closed-cooling circuit — each routed to a specific connection point. Confirm by engine serial number and diagram. Do not confuse 32-864544 with:
- 32-864543 — Heat Exchanger to Port Elbow (opposite side)
- 32-864974 — Heat Exchanger to Starboard Elbow, 6-inch riser configuration
- 32-864886 — Heat Exchanger to Circulating Pump
When to Replace
- Cracking, surface checking, or hardened rubber
- Soft, swollen, or spongy areas along the hose body
- Leakage at either connection point
- Chafing, abrasion, or distortion at clamp locations
- Internal collapse or restriction suspected
Inspect all closed-cooling hoses whenever the heat exchanger or exhaust elbows are serviced. If the port-side hose shows similar age and wear, replace both at the same time.
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 during replacement
- Route the hose without twisting or kinking and keep it clear of hot surfaces and moving components
- Tighten clamps to the torque specified in the Mercury service manual
- After installation, run the engine to operating temperature and inspect the full cooling circuit for leaks
Part Number Cross-Reference
- Current OEM: 32-864544
- Base Reference: 864544
- GTIN: 745061559219
- Related — port side: 32-864543
- Related — 6-inch riser starboard: 32-864974
Parts Desk Insights
Best use case: Order 32-864544 when you have confirmed the starboard-side hose failure on a MerCruiser closed-cooling V-drive inboard and have matched the part number to your engine diagram. It is most commonly replaced during heat exchanger service or exhaust elbow inspection.
Common issues: The most frequent ordering mistake is selecting a hose by engine displacement alone without confirming drive type and riser height — similar engines in different configurations use different hoses at the same diagram position. A second common mistake is confusing this starboard-side hose with the port-side companion 32-864543. If the customer is unsure of their riser configuration, have them measure riser height or check the engine tag before ordering.
Related Parts
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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If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
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Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
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