Description
Mercury / MerCruiser Quicksilver Serpentine Belt — 865615Q04
The Mercury Quicksilver 865615Q04 is a genuine OEM serpentine accessory drive belt used on select MerCruiser sterndrive and inboard engines. This multi-rib belt transfers power from the crankshaft to critical engine accessories such as the alternator, power steering pump, and seawater pump, ensuring reliable engine operation and charging performance.
Key Specifications
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Part Number: 865615Q04 (also listed as 57-865615Q04)
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Type: Multi-rib serpentine belt
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Length:1,941 mm (≈76.4 in)
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OEM Brand: Mercury Marine / Quicksilver
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Application: Accessory drive belt for MerCruiser engines
Compatible Engines
Commonly used on 2001 and newer MerCruiser V-6 and V-8 sterndrive engines, including:
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4.3L V6
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5.0L V8 (305 CID)
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5.7L V8 (350 CID)
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Some 6.2L V8 applications
Typically installed on Alpha sterndrive engines with standard cooling, often within serial ranges 0M320025 and newer.
Superseded / Cross-Reference Numbers
This belt replaces several earlier MerCruiser part numbers:
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57-8638764
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57-862086
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57-8620861
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57-862086A1
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57-865615004
Common aftermarket equivalent: Sierra 18-15101.
Features
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Genuine Mercury / Quicksilver OEM replacement
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Precision rib design for proper pulley alignment and grip
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Built to withstand high-load marine engine environments
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Direct replacement for the factory-installed belt
Fitment Tip:
Always confirm compatibility using your engine model and serial number. MerCruiser engines with similar displacement can use different belt lengths depending on accessory configuration and cooling setup.
Shipping: Ships same or next day for fast Canada wide shipping.






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