Multi-Rib Belt – Fits Volvo Penta D4, D6 260-370HP (Replaces 21407026, 3583963, 3584433)

Multi-Rib Belt – Fits Volvo Penta D4, D6 260-370HP

This high-quality aftermarket multi-rib belt is designed for Volvo Penta D4 and D6 series diesel engines manufactured from 2003 onward, specifically models rated between 260-370 HP. It serves as a direct replacement serpentine/compressor belt, ensuring reliable performance of your engine's accessory drive system.

This component is a direct replacement for Volvo Penta part numbers: 21407026, 3583963, and 3584433.

• Belt Type: Multi-rib serpentine/compressor belt for engine driven systems.
• Belt Dimensions: 1425mm (56⁷/₆₄ inches) in length.
• Quality Manufacturing: Produced in an ISO9002-certified facility to meet or exceed OEM specifications.

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 x Multi-Rib Belt (Replaces 21407026/3583963/3584433)

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, alternator (and power-steering if applicable) pulleys.
5. Remove the old belt by swiveling the alternator or tensioner to relieve tension, then slip the belt off 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, then the main pivot bolt to factory torque specs.
10. Reconnect the battery.
11. Start the engine, observe belt tracking to ensure it's centered in grooves and running smoothly.
12. Shut down and recheck tension after a short run. Re-tension if necessary as new belts may stretch slightly initially.

Troubleshooting & FAQ

How do I confirm this belt fits my Volvo Penta engine?
Verify your engine is a Volvo Penta D4 or D6 model with a 260-370 HP rating. Cross-reference your existing belt's part number with the ones this product replaces: 21407026, 3583963, or 3584433. For final confirmation, check your model against our compatibility table.

Is this a compressor belt or a serpentine belt?
It functions as both. This multi-rib belt drives the engine's accessories, which often includes the supercharger/compressor on these models. It is correctly referred to as a serpentine or compressor belt for Volvo Penta D4/D6 engines.

What are the signs my multi-rib belt needs replacement?
Common signs of a failing belt include visible cracks, fraying, glazing, or missing ribs. You may also hear a persistent squealing sound from the engine, which can indicate the belt is slipping due to wear or improper tension.

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.