Description
Mercury / MerCruiser Quicksilver Serpentine Belt — 865615Q03
The Mercury Quicksilver 865615Q03 is a genuine OEM serpentine accessory drive belt used on many MerCruiser sterndrive and inboard engines. This multi-rib belt transfers power from the crankshaft to engine accessories such as the alternator, seawater pump, and power steering pump, helping maintain proper engine charging and cooling performance.
Key Specifications
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Part Number: 865615Q03 (also referenced as 57-865615Q03)
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Type: Multi-rib serpentine belt
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Length:2,704 mm (≈106.5 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 2001–2016 MerCruiser V-6 and V-8 engines, including:
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4.3L V6 MPI
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5.0L V8 (305 CID)
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5.7L V8 (350 CID)
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377 CID engines
Typical configurations include:
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Alpha drives with closed cooling systems
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Bravo drives with standard cooling systems
Applicable serial ranges commonly fall between:
0M320025 – 2A455872 (varies by configuration).
Superseded / Cross-Reference Numbers
This belt may replace earlier Mercury part numbers such as:
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57-8638763
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57-862807
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57-862087A1
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57-865615-003
Aftermarket equivalent: Sierra 18-15100.
Features
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Genuine Mercury / Quicksilver OEM replacement
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Precision rib design for proper pulley grip and quiet operation
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Designed for high-load marine environments
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Direct replacement for factory-installed belt
Fitment Tip:
Always verify compatibility using the engine serial number. MerCruiser engines with the same displacement can use different belt lengths depending on cooling system configuration and accessory layout.
Shipping: Ships same or next day for fast Canada wide shipping.






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