Volvo Penta D4 & D6 Marine V-Belt – Replaces 21405494, 21405444 & 3583729
Volvo Penta D4 & D6 Marine V-Belt – Replaces 21405494, 21405444 & 3583729 is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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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.
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Volvo Penta D4 & D6 Marine V-Belt – Replaces 21405494, 21405444...
Volvo Penta D4 & D6 Marine V-Belt – Replaces 21405494, 21405444 & 3583729 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket marine V-belt is designed for Volvo Penta D4 and D6 engine applications. It provides dependable belt drive performance for the engine's belt-driven components when the original belt is worn, cracked, glazed, or otherwise due for replacement.
The belt is listed as a replacement for Volvo Penta reference numbers 21405494, 21405444, and 3583729. Confirm the reference number and belt profile against the belt removed from your engine before ordering.
- Product type: Marine V-belt
- Application: Volvo Penta D4 and D6 engines
- Replacement references: 21405494, 21405444, and 3583729
- Construction: Replacement belt for marine engine service
Part Number Matrix
Use the following manufacturer reference numbers when comparing the replacement belt with your existing part.
| Brand | Part Number |
|---|---|
| Volvo Penta | 21405494 |
| Volvo Penta | 21405444 |
| Volvo Penta | 3583729 |
Engine & Model Compatibility
The company catalog identifies this belt for Volvo Penta D4 and D6 applications. The available company fitment does not specify individual model suffixes, horsepower ratings, production years, serial-number ranges, or stroke variations. Verify the engine identification and reference number before purchase.
| Brand | Engine Family | Application | Reference Numbers |
|---|---|---|---|
| Volvo Penta | D4 | Marine engine application | 21405494, 21405444, 3583729 |
| Volvo Penta | D6 | Marine engine application | 21405494, 21405444, 3583729 |
Technical Specs
- Product Type
- Marine V-belt
- Application
- Volvo Penta D4 and D6 engine applications
- Installation
- Engine-mounted belt drive
- Reference Numbers
- 21405494, 21405444, and 3583729
- Product Status
- Aftermarket replacement
What’s in the Box
- 1 x Marine V-belt
Installation Notes
- Switch off the engine and disconnect the vessel's battery to prevent accidental starting.
- Allow the engine to cool, then locate the belt and its tensioning or adjustment components.
- Release belt tension according to the engine manufacturer's service procedure.
- Remove the old belt and note its routing before installation.
- Install the replacement belt over the correct pulleys, ensuring that it is fully seated in the V-grooves.
- Restore the specified belt tension using the engine manufacturer's procedure.
- Turn the engine by hand where appropriate and recheck belt alignment before reconnecting the battery and starting the engine.
Troubleshooting & FAQ
How do I know if this belt fits my engine?
This belt is cataloged for Volvo Penta D4 and D6 applications and replaces reference numbers 21405494, 21405444, and 3583729. Because individual model suffixes, years, and serial-number ranges are not specified in the available fitment data, compare the reference number and belt profile with your existing belt before ordering.
What are the signs of a worn or failing belt?
Inspect the belt for cracks, fraying, glazing, hardening, visible damage, or abnormal wear. Squealing or chirping during operation can also indicate a belt, alignment, or tension problem. Investigate the cause before installing a replacement.
When should the belt be replaced?
Inspect the belt during routine engine service and replace it when it shows damage, deterioration, abnormal wear, or insufficient tension. Follow the maintenance guidance for your specific Volvo Penta engine.
Do I need a special tool to change this belt?
The required tools depend on the engine installation and belt-tensioning arrangement. Use the tools and procedure specified in the applicable Volvo Penta service documentation, and do not force the belt over a pulley.
Is this an OEM belt?
This listing is for an aftermarket replacement belt. The listed Volvo Penta numbers are reference numbers used to help identify the intended replacement application; this product is not represented as a Volvo Penta original-equipment component.
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?
Returns are accepted within our standard return window for unused items in their original condition. Please contact our support team with your order details if you have a product question or need return instructions. Warranty coverage, where applicable, follows the terms provided with the order.
Safety & Important Info
- Verify the belt profile, reference number, pulley arrangement, and engine application against your original part before purchase.
- Do not install a belt that is damaged, incorrectly sized, or not fully seated in the pulley grooves.
- Disconnect the battery and follow the engine manufacturer's safety and service instructions before beginning work.
- This is an aftermarket replacement part, not an original equipment manufacturer (OEM) component.
- Professional installation is recommended when the correct belt routing or tension procedure is uncertain.
About Sea Sierra
- Pro-Grade Standards — We supply marine replacement parts selected for dependable service in real-world applications.
- 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 manufacturing partners, we provide practical replacement parts at competitive prices.
Payment & Security
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