57-880566Q14 Alternator Drive Belt for Mercury Verado | JLM Marine

Alternator Drive Belt for Mercury Verado 135-400HP Outboards

This alternator drive belt is engineered to fit Mercury Verado outboard engines ranging from 135HP to 400HP. Designed as a direct replacement for Quicksilver OEM serpentine belts, it ensures reliable power transmission from the crankshaft to the alternator, maintaining optimal charging performance in demanding marine environments.

Direct Replacement For: Mercury OEM part numbers 57-835392Q14 and 57-880566Q14. This belt is compatible with L6 Verado models including 225HP, 250HP, 275HP, 300HP, 350HP, and 400HP configurations.

• High-quality serpentine belt construction for durability in saltwater conditions
• Fits multiple Mercury Verado horsepower ratings from 135HP through 400HP
• Single belt included per package

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 the following component:

• 1 x Alternator Drive Belt

Installation Guide

1. Disconnect the battery: Remove the negative terminal to prevent electrical hazards during installation.
2. Access the belt housing: Remove the engine cover and any protective cowling to expose the alternator belt assembly.
3. Relieve belt tension: Locate the belt tensioner and use the appropriate tool to release tension on the old belt.
4. Remove the old belt: Carefully slide the worn belt off the pulleys, noting the routing path for reference.
5. Inspect pulleys: Check all pulleys for wear, damage, or debris. Clean if necessary before installing the new belt.
6. Route the new belt: Follow the same path as the original belt, ensuring it sits properly in all pulley grooves.
7. Apply tension: Use the tensioner mechanism to apply proper tension to the new belt according to manufacturer specifications.
8. Verify alignment: Confirm the belt is seated correctly on all pulleys with no twists or misalignment.
9. Reinstall covers: Replace all protective cowling and engine covers securely.
10. Reconnect the battery: Reattach the negative terminal and ensure a secure connection.
11. Test operation: Start the engine and verify the alternator is charging properly. Listen for any unusual belt noise.
12. Final inspection: After a short test run, recheck belt tension and alignment to ensure proper installation.

Troubleshooting & FAQ

Q: How do I confirm this belt fits my Mercury Verado engine?
A: Check your engine's horsepower rating (135-400HP) and verify your current belt's part number matches 57-835392Q14 or 57-880566Q14. You can also consult the compatibility table above or reference Mercury's parts diagrams using your engine's serial number.

Q: What are the signs that my alternator belt needs replacement?
A: Common symptoms include squealing noises during engine operation, visible cracking or fraying on the belt surface, charging system warnings, dimming instruments, or a dead battery after running. Inspect the belt regularly for glazing, excessive wear, or looseness.

Q: How often should I replace the alternator belt on my Verado?
A: Mercury recommends inspecting the belt at every 100-hour service interval or annually. Replace the belt if you notice cracks, fraying, glazing, or every 2-3 years as preventative maintenance, even if it appears functional.

Q: Can I install this belt myself or do I need a professional?
A: If you have mechanical experience and the proper tools to access the belt tensioner, installation is straightforward. However, improper tension or routing can damage the alternator or cause premature belt failure, so professional installation is recommended if you're uncertain.

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.