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.

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Key Specifications

• Part Number: 865615Q03 (also referenced as 57-865615Q03)

• Type: Multi-rib serpentine belt

• Length:2,704 mm (≈106.5 in)

• OEM Brand: Mercury Marine / Quicksilver

• Application: Accessory drive belt for MerCruiser engines

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Compatible Engines

Commonly used on 2001–2016 MerCruiser V-6 and V-8 engines, including:

• 4.3L V6 MPI

• 5.0L V8 (305 CID)

• 5.7L V8 (350 CID)

• 377 CID engines

Typical configurations include:

• Alpha drives with closed cooling systems

• Bravo drives with standard cooling systems

Applicable serial ranges commonly fall between:
0M320025 – 2A455872 (varies by configuration).

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Superseded / Cross-Reference Numbers

This belt may replace earlier Mercury part numbers such as:

• 57-8638763

• 57-862807

• 57-862087A1

• 57-865615-003

Aftermarket equivalent: Sierra 18-15100.

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Features

• Genuine Mercury / Quicksilver OEM replacement

• Precision rib design for proper pulley grip and quiet operation

• Designed for high-load marine environments

• Direct replacement for factory-installed belt

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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.