Serpentine Belt – Fits MerCruiser 5.0L/5.7L/6.2L/7.4L (Replaces 57-865615Q06)

Serpentine Belt – Fits MerCruiser 5.0L/5.7L/6.2L/7.4L (Replaces 57-865615Q06)

This serpentine belt is designed to fit MerCruiser 5.0L, 5.7L, 6.2L, and 7.4L inboard and sterndrive engines manufactured between 1998 and 2004. It serves as a direct replacement for multiple OEM and aftermarket part numbers, ensuring reliable power transmission for Alpha and Bravo applications.

It is a direct replacement for Mercury/MerCruiser part numbers 57-865615Q06, 865615Q06, 57-865615006, 57-8638766, 57-8610491, and Sierra 18-15102.

• Installation Method: Direct OEM replacement
• Material: Constructed with high-strength rubber cords for durability and longevity.
• Dimensions: The belt has a length of 2,667 mm (105 inches).

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

• 1 x Serpentine Belt (57-865615Q06)

Installation Guide

1. Safety First: Ensure the engine is off and cool, and disconnect the battery's negative terminal.
2. Locate the Belt: Identify the serpentine belt and its routing path around the pulleys. It's helpful to take a picture or find a diagram for your specific engine model.
3. Release Tension: Locate the automatic belt tensioner. Use a socket or belt tensioner tool to rotate the tensioner, releasing the pressure on the belt.
4. Remove Old Belt: While the tension is released, carefully slide the old belt off the pulleys.
5. Inspect Pulleys: Before installing the new belt, check all pulleys for wobble, damage, or seizure. Spin them by hand to ensure they rotate smoothly.
6. Install New Belt: Following your diagram or photo, route the new belt around the pulleys, saving the tensioner pulley for last.
7. Apply Tension: Slowly release the tensioner back to its original position to apply tension to the new belt. Ensure the belt is properly seated in all pulley grooves.
8. Final Check: Reconnect the battery, start the engine, and listen for any unusual noises. Let it run for a minute to confirm the belt is tracking correctly.

Troubleshooting & FAQ

How do I confirm this fits my engine?
To ensure compatibility, check your engine model, year, and serial number against the "Compatible Engine Models" table above. This belt replaces OEM part number 57-865615Q06. Verifying your existing part number provides the best confirmation of fitment.

What are the signs of a failing serpentine belt?
Common symptoms include loud squealing or chirping noises from the engine bay, visible cracks, frays, or glazing on the belt's surface, and intermittent or complete failure of belt-driven accessories like the alternator, power steering pump, or water pump.

How often should I replace my serpentine belt?
Refer to your engine's service manual for specific maintenance intervals. As a general guideline, serpentine belts should be inspected for wear and damage at every service and typically replaced every 3 to 5 years, depending on usage and conditions.

OEM vs. Aftermarket?
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.

How fast do you ship and how much does it cost?
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.

What is your warranty and return policy?
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.