Compressor Belt for Volvo Penta D4-300 and D6-400/D6-435 – Replaces 21405493, 3817787, 23324914
Compressor Belt for Volvo Penta D4-300 and D6-400/D6-435 – Replaces 21405493, 3817787, 23324914 is backordered and will ship as soon as it is back in stock.
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Compressor Belt for Volvo Penta D4-300 and D6-400/D6-435 – Replaces...
Compressor Belt for Volvo Penta D4-300 and D6-400/D6-435 – Replaces 21405493, 3817787, 23324914 is backordered and will ship as soon as it is back in stock.
Product Details
This marine compressor belt is specified for selected Volvo Penta diesel engine applications. The company fitment listing identifies it for the Volvo Penta D4-300 and D6-400/D6-435 engines. It is supplied as one belt for the engine’s compressor drive system.
This belt is listed with the following Volvo Penta reference numbers: 21405493, 3817787, and 23324914. Verify the reference number and complete engine model before ordering.
- Compressor belt for selected Volvo Penta marine diesel engines.
- Specified fitment for D4-300 and D6-400/D6-435 applications.
- Single replacement belt; no additional components are included.
- Designed for installation on the external engine drive system.
Part Number References
Use the following numbers to compare the belt with your existing part and engine documentation. These references are not a substitute for confirming the exact engine model and serial-number requirements.
| Brand | Reference Number | Application Note |
|---|---|---|
| Volvo Penta | 21405493 | Reference number listed for this compressor belt. |
| Volvo Penta | 3817787 | Reference number listed for this compressor belt. |
| Volvo Penta | 23324914 | Reference number listed for this compressor belt. |
Engine Compatibility
The company fitment information for this belt is limited to the engine applications shown below. Do not extend this fitment to other D4 or D6 horsepower variants without confirming the required belt reference for the specific engine.
| Brand | Engine Model | Rated HP | Application | Reference Numbers |
|---|---|---|---|---|
| Volvo Penta | D4-300 | 300 | Compressor belt | 21405493, 3817787, 23324914 |
| Volvo Penta | D6-400 | 400 | Compressor belt | 21405493, 3817787, 23324914 |
| Volvo Penta | D6-435 | 435 | Compressor belt | 21405493, 3817787, 23324914 |
Technical Specifications
- Product Type
- Marine compressor belt
- Brand Application
- Volvo Penta stern / out-drive engine applications
- Compatible Engines
- Volvo Penta D4-300, D6-400, and D6-435
- Function
- Drives the compressor system on the specified engine applications
- Reference Numbers
- 21405493, 3817787, 23324914
- Quantity
- 1 belt
What’s in the Box
- 1 x Compressor belt
Installation Notes
- Safety First: Disconnect the battery and make sure the engine is cool and cannot start before beginning work.
- Confirm the Application: Check the engine model, existing belt reference, and routing against the service documentation before removing the old belt.
- Record the Routing: Photograph the installed belt or use the engine manufacturer’s routing diagram as a guide.
- Release Belt Tension: Use the correct tool for the belt tensioning arrangement on your engine. Avoid prying against housings, pulleys, or other components.
- Remove the Old Belt: Carefully remove the belt from the compressor drive pulleys and inspect the pulleys for damage, contamination, or misalignment.
- Install the Replacement: Route the new belt exactly as shown in the applicable engine service documentation.
- Check Seating and Tension: Confirm that the belt is fully seated in every groove and that the tension is set according to the engine manufacturer’s specification.
- Final Check: Rotate the drive by hand where appropriate to confirm smooth movement and correct alignment. Reconnect the battery and check the installation after starting the engine.
Maintenance & Troubleshooting
Inspect the belt during routine engine service for cracking, fraying, glazing, contamination, abnormal wear, or missing belt material. A squeal, chirp, visible misalignment, or loss of compressor drive may indicate a worn belt, pulley problem, or incorrect tension. Correct the underlying issue before installing a replacement belt.
Troubleshooting & FAQ
Which Volvo Penta engines does this compressor belt fit?
The listed company fitment is Volvo Penta D4-300, D6-400, and D6-435. Other D4 or D6 variants are not confirmed by this listing, so check the exact engine model, serial number, and required belt reference before purchase.
Is this a general serpentine belt for all engine accessories?
No. This listing is for a compressor belt. Do not assume that it drives the alternator, water pump, or every other engine accessory unless your specific engine’s service documentation confirms that routing.
What reference numbers should I compare?
Compare your existing belt and engine documentation with Volvo Penta reference numbers 21405493, 3817787, and 23324914. Confirm the complete engine application before ordering.
Can I install the belt myself?
Installation should follow the applicable Volvo Penta service procedure and requires the correct tools for the engine’s tensioning arrangement. If you are unsure about belt routing, tension, or alignment, use a qualified marine technician.
What should I do if the belt does not seat correctly?
Stop installation and recheck the belt reference, engine model, routing diagram, pulley alignment, and tensioning components. Do not force a belt onto a pulley or operate the engine with a misaligned belt.
Safety & Important Information
- Verify the engine model and belt reference before purchase and installation.
- The confirmed fitment is limited to Volvo Penta D4-300, D6-400, and D6-435 applications.
- This product is a compressor belt, not a confirmed universal belt for all engine accessories.
- Follow the engine manufacturer’s service instructions for routing, tension, and inspection.
- Professional installation is recommended when the correct belt routing or tensioning procedure is uncertain.
About Sea Sierra
- Marine Parts Focus — We supply replacement components for marine engine and drive-system applications.
- Application-Based Listings — Check the listed model and reference information carefully before ordering.
- Support for Correct Fitment — Use your engine model, serial information, and existing part reference when confirming a replacement.
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