Serpentine Drive Belt – Fits Volvo Penta D4 & D6 Series Engines (Replaces 21405494, 3583729, 21405444)
Serpentine Drive Belt – Fits Volvo Penta D4 & D6 Series Engines (Replaces 21405494, 3583729, 21405444) is backordered and will ship as soon as it is back in stock.
Worry-free returns
Worry-free returns
Shop with confidence. If you’re not completely satisfied, eligible items may be returned within the return window, provided they are unused and in original packaging.
If the return is due to our error or a defective item, we’ll make it right.
Please contact us before returning any item.
Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
Tracking information will be provided once your order ships.
Serpentine Drive Belt – Fits Volvo Penta D4 & D6 Series Engines...
Serpentine Drive Belt – Fits Volvo Penta D4 & D6 Series Engines (Replaces 21405494, 3583729, 21405444) is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket Serpentine Drive Belt – Fits Volvo Penta D4 & D6 Series Engines 145-480HP is engineered for reliable power transmission in 4-stroke marine diesel engines from 2003 to 2025. Its multi-rib design ensures optimal contact with pulleys, reducing slippage and extending the service life of engine accessories.
It serves as a direct replacement for Volvo Penta part numbers 21405494, 3583729, and 21405444, providing a precise fit and function for routine or corrective maintenance.
- Installation: Mounts directly to the engine's accessory drive system.
- Construction: Made from durable rubber with reinforced construction for marine environments.
- Design: Features a multi-rib (serpentine) profile for efficient grip and flexibility.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| Brand | Part Number |
|---|---|
| Volvo Penta | 21405494 |
| Volvo Penta | 3583729 |
| Volvo Penta | 21405444 |
Engine & Model Compatibility
Confirm your engine model and year in the table below to ensure accurate fitment.
This belt is designed for a wide range of Volvo Penta D4 and D6 series engines.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Volvo Penta | D4-145I-G | 145 | 4-Stroke | 2019–2025 | 21405494 |
| Volvo Penta | D4-150A-G | 150 | 4-Stroke | 2019–2025 | 21405494 |
| Volvo Penta | D4-175I-G | 175 | 4-Stroke | 2019–2025 | 21405494 |
| Volvo Penta | D4-180I-F | 180 | 4-Stroke | 2005–2010 | 21405494 |
| Volvo Penta | D4-210I-A | 210 | 4-Stroke | 2003–2004 | 21405494 |
| Volvo Penta | D4-210I-B | 210 | 4-Stroke | 2004–2006 | 21405494 |
| Volvo Penta | D4-225A/I-F | 225 | 4-Stroke | 2005–2010 | 21405494 |
| Volvo Penta | D4-230A/I-G | 230 | 4-Stroke | 2019–2025 | 21405494 |
| Volvo Penta | D4-260A/D/I-F | 260 | 4-Stroke | 2004–2010 | 21405494 |
| Volvo Penta | D4-270A/I-G | 270 | 4-Stroke | 2019–2025 | 21405494 |
| Volvo Penta | D4-300A/D/I-F | 300 | 4-Stroke | 2007–2010 | 21405494 |
| Volvo Penta | D4-300A/I-G | 300 | 4-Stroke | 2019–2025 | 21405494 |
| Volvo Penta | D4-320A/I-G | 320 | 4-Stroke | 2019–2025 | 21405494 |
| Volvo Penta | D6-280I-F | 280 | 4-Stroke | 2004–2010 | 21405494 |
| Volvo Penta | D6-300A/I-F | 300 | 4-Stroke | 2003–2010 | 21405494 |
| Volvo Penta | D6-300A/D/I-G | 300 | 4-Stroke | 2019–2025 | 21405494 |
| Volvo Penta | D6-310I-F | 310 | 4-Stroke | 2003–2010 | 21405494 |
| Volvo Penta | D6-330A/D/I-F | 330 | 4-Stroke | 2007–2010 | 21405494 |
| Volvo Penta | D6-340A/D/I-G | 340 | 4-Stroke | 2019–2025 | 21405494 |
| Volvo Penta | D6-370D/I-F | 370 | 4-Stroke | 2004–2010 | 21405494 |
| Volvo Penta | D6-380A/D/I-G | 380 | 4-Stroke | 2019–2025 | 21405494 |
| Volvo Penta | D6-400A-F | 400 | 4-Stroke | 2006–2010 | 21405494 |
| Volvo Penta | D6-400A-G | 400 | 4-Stroke | 2019–2025 | 21405494 |
| Volvo Penta | D6-435D/I-F | 435 | 4-Stroke | 2006–2010 | 21405494 |
| Volvo Penta | D6-440A/D/I-G, D6-440I-WJ-G | 440 | 4-Stroke | 2019–2025 | 21405494 |
| Volvo Penta | D6-480D/I-G, D6-480I-WJ-G | 480 | 4-Stroke | 2019–2025 | 21405494 |
Technical Specs
- Product Type
- Serpentine Drive Belt
- Installation
- Engine-mounted
- Fuel Type
- Diesel (marine)
- Housing Material
- Rubber with reinforced construction
- Housing Color
- Black
- Dimensions
- 13.00" x 7.00" x 3.00" (330mm x 178mm x 76mm)
- Warranty
- 1 year (aftermarket)
- Other Technical Attributes
- Multi-rib (serpentine) design
What’s in the Box
- 1 x Serpentine Drive Belt (Replaces 21405494, 3583729, 21405444)
Installation Notes
- Disconnect the vessel's battery to prevent accidental starts.
- Locate the serpentine belt and automatic tensioner on the front of the engine.
- Use an appropriate tool to rotate the tensioner pulley, releasing tension from the belt.
- Carefully slip the old belt off the pulleys. Note the routing path.
- Route the new belt according to the manufacturer's diagram, ensuring it is seated correctly in all pulley grooves.
- Release the tensioner to apply pressure to the new belt.
- Double-check belt alignment and tension before reconnecting the battery.
Troubleshooting & FAQ
How do I know if this belt fits my engine?
This belt is designed for Volvo Penta D4 and D6 series engines manufactured between 2003 and 2025. Please cross-reference your engine model and year with the 'Engine & Model Compatibility' table above and confirm it replaces OEM part numbers 21405494, 3583729, or 21405444.
What are the signs of a worn or failing serpentine belt?
Common signs include visible cracks, fraying, or glazing on the belt's surface; squealing or chirping noises from the engine bay, especially on startup or when under load; and overheating or loss of power steering, as the belt drives these critical accessories.
What is the typical replacement interval?
While there is no fixed interval, it is best practice to inspect the serpentine belt during every routine service. Replacement is typically recommended based on condition (wear and tear) rather than a strict schedule, but consult your engine's service manual for specific guidance.
Do I need a special tool to change this belt?
Most Volvo Penta tensioners require a standard breaker bar or socket wrench to release the tension. No highly specialized tools are usually necessary, but having the correct tool to safely operate the tensioner is essential.
What’s the difference between OEM and this aftermarket part?
This listing is an aftermarket replacement (not OEM). It is built to meet or exceed OEM-level specifications using comparable high-quality materials. Our parts are manufactured in an ISO 9002 certified facility and are batch-inspected to ensure consistent quality and performance.
How fast is shipping and what does it cost?
We ship worldwide, and typical transit time is 5–15 days. Standard shipping is free for most orders. If available for your location, expedited shipping options and their costs will be displayed at checkout.
What is the warranty and return policy?
This part is covered by a 1-year warranty against manufacturing defects under normal marine use. Should an issue arise, please contact our support team with your order details. Returns are accepted within our standard window for unused items in their original condition. See our full policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part before purchase. If anything differs—even if your model appears compatible—do not order.
- This is an aftermarket replacement part, not an original equipment manufacturer (OEM) component.
- Professional installation is strongly recommended to ensure safety and optimal engine performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world reliability.
- Fast Global Fulfillment — We offer free standard delivery to most regions with a typical transit time of 5–15 days.
- Manufacturer-Direct Value — By working directly with our manufacturing partners, we provide fair pricing without compromising on materials or quality control.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
