Serpentine Alternator Drive Belt – Fits MerCruiser 5.0L, 5.7L, 6.2L V8 Engines (Replaces 57-865615Q10)

Serpentine Alternator Drive Belt – Fits MerCruiser 5.0L, 5.7L, 6.2L V8 Engines (Replaces 57-865615Q10)

This serpentine drive belt is designed for Mercury MerCruiser 5.0L, 5.7L, and 6.2L V8 engines (2001–2008), including standard and MPI Horizon models. It is responsible for driving essential engine accessories like the alternator and water pump.

This part is a direct replacement for the following Mercury OEM part numbers: 57-865615Q10, 57-865615010, 865615010, and 865615Q10.

• Material: Durable, reinforced rubber construction
• Primary Function: Drives the engine alternator and water pump
• Length: 2195 mm

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Technical Specifications

Package Contents

This package includes:

• 1 x Serpentine Belt (57-865615Q10)

Installation Guide

Follow these general steps to replace the serpentine belt. Refer to your engine's service manual for detailed instructions.

1. Safety First: Disconnect the boat's battery before beginning work.
2. Locate Components: Identify the serpentine belt, tensioner pulley, and belt routing diagram (often found on a decal on the engine).
3. Release Tension: Use a socket or breaker bar on the tensioner pulley to release the belt's tension.
4. Remove Old Belt: Carefully slide the old belt off the pulleys.
5. Install New Belt: Route the new belt according to the diagram, ensuring it is seated correctly in all pulley grooves.
6. Apply Tension: Slowly release the tensioner to apply pressure to the new belt.
7. Final Check: Double-check the belt's alignment and tension. It should be snug but not overly tight.
8. Test: Reconnect the battery and start the engine, listening for any unusual noises and visually confirming the belt is running true.

Troubleshooting & FAQ

Q: How do I confirm this belt fits my engine?
A: Verify your engine model, horsepower, and year range against our "Compatible Engine Models" list. This belt is a direct replacement for OEM part number 57-865615Q10 and fits specific MerCruiser V8 engines. Cross-reference the part number with your service manual or existing part.

Q: What are the symptoms of a bad serpentine belt?
A: Common signs of failure include loud squealing or chirping sounds from the engine bay, visible cracks, glazing, or fraying on the belt surface, and malfunctions in the systems it powers, such as the alternator (causing charging issues) or the water pump (leading to overheating).

Q: How often should I replace my engine's serpentine belt?
A: We recommend inspection during regular service intervals and replacement as suggested by your engine's manufacturer, or immediately if signs of wear or damage are present. Proactive replacement can prevent accessory failure and engine damage.

Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.