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.

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Key Specifications

• Part Number: 865615Q04 (also listed as 57-865615Q04)

• Type: Multi-rib serpentine belt

• Length:1,941 mm (≈76.4 in)

• OEM Brand: Mercury Marine / Quicksilver

• Application: Accessory drive belt for MerCruiser engines

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Compatible Engines

Commonly used on 2001 and newer MerCruiser V-6 and V-8 sterndrive engines, including:

• 4.3L V6

• 5.0L V8 (305 CID)

• 5.7L V8 (350 CID)

• Some 6.2L V8 applications

Typically installed on Alpha sterndrive engines with standard cooling, often within serial ranges 0M320025 and newer.

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Superseded / Cross-Reference Numbers

This belt replaces several earlier MerCruiser part numbers:

• 57-8638764

• 57-862086

• 57-8620861

• 57-862086A1

• 57-865615004

Common aftermarket equivalent: Sierra 18-15101.

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Features

• Genuine Mercury / Quicksilver OEM replacement

• Precision rib design for proper pulley alignment and grip

• Built to withstand high-load marine engine environments

• Direct replacement for the factory-installed belt

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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.