V-Belt for Mercruiser, Volvo Penta, OMC Engines 110-160HP (57-64416, 841821, 912509)

V-Belt – Fits Mercruiser, Volvo Penta, OMC 110-160HP Engines

This high-quality V-belt is designed for a range of Mercruiser, Volvo Penta, and OMC inboard engines. It drives essential engine accessories such as the alternator and water pump, ensuring reliable performance. Manufactured from durable, fabric-reinforced rubber, it meets or exceeds OEM specifications for fit and function.

This part is a direct replacement for Volvo Penta part numbers 841821, 958314, 958359, 966382, and 966978; Mercruiser part numbers 57-64416, 57-49211, and 57-44206; and OMC part numbers 912509 and 0912509.

• Product Type: Serpentine/Fan V-Belt for alternator, water pump, and other accessories.
• Engine Compatibility: Fits select gasoline and diesel engines from Mercruiser, Volvo Penta, and OMC.
• Installation: Mounts as the main engine accessory drive belt.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across compatible brands.

Compatible Engine Models

Confirm your engine model/year in the table below.

Technical Specifications

Package Contents

• 1 x V-Belt for Mercruiser, Volvo Penta, or OMC (Replaces OEM Part Numbers: 57-64416, 841821, 912509, and others)

Installation Guide

1. Ensure the engine is turned off and cooled completely.
2. Disconnect the battery to prevent accidental starting.
3. Loosen the alternator pivot bolt just enough to allow slight movement. Also loosen any adjuster-plate or tensioner bolts.
4. Identify belt routing: Note the path around the crankshaft, water-pump, and alternator pulleys.
5. Remove the old belt by swiveling the alternator or tensioner to relieve tension, then slip the belt off the pulleys.
6. Inspect pulley grooves for wear, rust, or corrosion. Clean them to bare metal if needed.
7. Route the new belt following the same pulley path. Ensure it seats properly in all V-grooves.
8. Tension the belt: Swivel the alternator away from the engine to create proper belt tension. A correctly tensioned V-belt deflects about 1 cm (½″) under moderate thumb pressure on the longest span.
9. Tighten all bolts: Secure the adjuster-plate bolt first, then the main pivot bolt to factory torque specifications.
10. Reconnect the battery.
11. Start the engine and observe belt tracking to ensure it's centered in the grooves and running smoothly.
12. Shut down and recheck tension after a short run-in period. New belts may stretch slightly, so re-tension if necessary.

Troubleshooting & FAQ

Q: How do I confirm this V-belt fits my specific engine?

A: The best way to ensure compatibility is to verify your engine model and year in the "Compatible Engine Models" table above. You should also cross-reference your old belt's part number with the numbers listed in our "Part Number Cross-Reference" table.

Q: What are the signs that my V-belt needs replacing?

A: Common signs of a failing V-belt include high-pitched squealing or chirping noises from the engine, visible cracks or fraying on the belt, and accessories like the alternator or water pump not functioning correctly (e.g., battery not charging, engine overheating).

Q: How tight should the new V-belt be?

A: Proper tension is critical. On the longest span between two pulleys, the belt should deflect about 1 cm (½ inch) when pressed firmly with your thumb. An over-tightened belt can damage bearings, while a loose belt will slip and wear out prematurely.

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.