Description

Mercury / MerCruiser Quicksilver Serpentine Belt — 865615Q07

The Mercury Quicksilver 865615Q07 is a genuine OEM serpentine accessory drive belt used on select MerCruiser big-block inboard and sterndrive engines. This multi-rib belt transfers power from the crankshaft to engine accessories such as the alternator and seawater pump, ensuring proper charging and cooling system operation.

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Key Specifications

• Part Number: 865615Q07 (also listed as 57-865615Q07)

• Type: Multi-rib serpentine belt

• Length: approx. 2467 mm (96.75 in)

• OEM Brand: Mercury Marine / Quicksilver

• Application: Accessory drive belt for MerCruiser big-block engines

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Compatible Engines

Commonly used on late-1990s to early-2000s MerCruiser V8 engines, including:

• 454 MAG MPI

• 454 MAG MPI Horizon (Gen VI)

• 7.4L MPI engines

• 502 MAG MPI

• 8.2L MPI MIE

Many applications fall within serial ranges from approximately 1998–2001 big-block MerCruiser engines.

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Superseded / Cross-Reference Numbers

This belt may also appear under several earlier part numbers:

• 57-861050

• 57-8638767

• 57-865615007

Aftermarket equivalent: Sierra 18-15103.

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Features

• Genuine Mercury / Quicksilver OEM replacement

• Engineered for proper rib alignment and pulley grip

• Designed for high-load marine engine environments

• Maintains reliable operation of critical accessories

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Fitment Tip:
Always verify compatibility using the engine serial number. Many MerCruiser engines with similar displacement can use different belt lengths depending on accessory configuration.

Shipping: Ships same or next day for fast Canada wide shipping.