Alternator V-Belt – Fits MerCruiser 3.0L/3.0L MPI 1999 & Up (Replaces 57-862054Q)

Alternator V-Belt – Fits MerCruiser 3.0L/3.0L MPI 1999 & Up (Replaces 57-862054Q)

This V-belt is designed for Mercury MerCruiser 3.0L and 3.0L MPI (135 HP) 4-stroke engines from 1999 and newer. It is a crucial component for driving the engine's alternator.

It serves as a direct replacement for multiple part numbers, ensuring wide compatibility with specific MerCruiser models. Please verify your engine serial number before ordering.

• Product Type: V-Belt (Alternator Belt)
• Engine Compatibility: Gasoline
• Installation: Fits the engine accessory belt system

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 V-Belt (57-862054Q)

Installation Guide

1. Safety First: Disconnect the boat's battery before beginning work.
2. Locate the Belt: Identify the alternator and the old V-belt connected to it.
3. Release Tension: Loosen the alternator's pivot and adjustment bolts to create slack in the belt.
4. Remove Old Belt: Carefully slip the old belt off the alternator, water pump, and crankshaft pulleys.
5. Inspect Pulleys: Check all pulleys for any signs of damage, rust, or misalignment. Clean them if necessary.
6. Install New Belt: Route the new belt around the pulleys, following the same path as the old one.
7. Set Tension: Apply pressure to the alternator to tension the new belt. A general rule is the belt should have about 1/2 inch of deflection when pressed firmly in the middle of its longest span.
8. Tighten Bolts: Securely tighten the adjustment and pivot bolts on the alternator.
9. Final Check: Reconnect the battery, start the engine, and listen for any unusual noises. Ensure the belt is running smoothly on the pulleys.

Troubleshooting & FAQ

Q: How do I confirm this V-belt fits my MerCruiser 3.0L?

A: This belt fits 3.0L and 3.0L MPI models from 1999 onwards with serial number 0L382122 and up. Please verify your engine's serial number and compare it to the details in the "Compatible Engine Models" table. The OEM part number this replaces is 57-862054Q.

Q: What are the signs that my alternator belt needs replacement?

A: Common signs include visible cracks, fraying, or glazing on the belt surface. You might also hear a high-pitched squealing noise from the engine, especially during startup or when under load, which indicates the belt is slipping.

Q: How often should I replace the alternator V-belt?

A: V-belt replacement intervals can vary. It's best to inspect the belt during regular engine maintenance and replace it if you see any signs of wear, damage, or excessive stretching. Refer to your engine’s service manual for specific recommendations.

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.