57-865615Q04 Serpentine Belt for MerCruiser 4.3L 5.0L 5.7L 6.2L | JLM Marine

Serpentine Belt for MerCruiser 4.3L 5.0L 5.7L 6.2L – Part Number 57-865615Q04

This serpentine belt is engineered for MerCruiser sterndrive engines, providing reliable power transmission for 4.3L, 5.0L, 5.7L, and 6.2L V6 and V8 models from 2000–2004 and later. It ensures smooth operation of essential engine accessories, delivering consistent performance in marine environments.

This belt directly replaces OEM MerCruiser part numbers 57-8638764, 57-862086, 57-8620861, 57-862086A1, 57-865615004, and 57-865615Q04, as well as Sierra Marine part number 18-15101, offering broad compatibility across multiple model years.

• Fits MerCruiser V6 and V8 sterndrive engines: 4.3L, 5.0L, 5.7L, and 6.2L
• 76.42" serpentine belt designed for engine accessory drive systems
• Compatible with serial numbers OL619000 and up (2000–04) and 0M300000 through 0W309999 (6.2L)

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.

Technical Specifications

Package Contents

• 1 × 76.42" Serpentine V Belt

Installation Guide

1. Disconnect the battery negative terminal to ensure safe working conditions.
2. Locate the belt tensioner on your MerCruiser engine and identify the routing path for the serpentine belt.
3. Use a suitable wrench or socket to rotate the tensioner clockwise, relieving tension on the old belt.
4. Carefully remove the old serpentine belt from all pulleys, noting its routing path (take a photo if necessary).
5. Inspect all pulleys for wear, damage, or debris; clean or replace as needed.
6. Route the new 76.42" serpentine belt around each pulley following the correct path (refer to your engine's belt routing diagram).
7. Rotate the tensioner again and slip the belt onto the final pulley, ensuring it seats properly in all grooves.
8. Release the tensioner slowly, allowing it to apply proper tension to the new belt.
9. Verify that the belt is correctly seated on all pulleys and properly aligned.
10. Reconnect the battery negative terminal.
11. Start the engine and listen for unusual noises; observe the belt for smooth operation without slipping or vibration.
12. Perform a final visual inspection after a short run to confirm belt alignment and tension.

Troubleshooting & FAQ

Q: How do I confirm this belt fits my MerCruiser engine?
A: Check your engine model (4.3L, 5.0L, 5.7L, or 6.2L) and serial number against the compatibility table above. If your serial number is OL619000 or higher (for 2000–04 models) or within 0M300000–0W309999 (for 6.2L), this belt is the correct fit.

Q: What are the signs that my serpentine belt needs replacement?
A: Common symptoms include squealing or chirping noises during engine operation, visible cracks or fraying on the belt surface, glazing (shiny appearance), or loss of power to accessories like the alternator or water pump. Replace the belt immediately if you notice any of these signs.

Q: How often should I replace the serpentine belt on my MerCruiser?
A: Inspect your serpentine belt at least once per season or every 100 hours of operation. Typical replacement intervals range from 2–4 years or 200–400 hours, depending on usage and operating conditions. Replace sooner if you observe wear or damage.

Q: Can I install this belt myself, or do I need a professional?
A: If you have basic mechanical skills and the proper tools (wrench/socket for the tensioner), you can install this belt yourself by following the installation guide. However, professional installation is recommended if you're unfamiliar with engine components or belt routing.

Q: Is this an OEM belt or an aftermarket replacement?
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.