Air Filter – Fits Volvo Penta AD31, AD41, TMD31, TMD41 (Replaces 21646645, 3582358)
Air Filter – Fits Volvo Penta AD31, AD41, TMD31, TMD41 (Replaces 21646645, 3582358) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Air Filter – Fits Volvo Penta AD31, AD41, TMD31, TMD41 (Replaces 21...
Product Details
This marine engine Air Filter – Fits Volvo Penta AD31, AD41, TMD31, TMD41 Engines, providing reliable filtration for diesel engines in the 30 and 40 series. It is designed for models including AD31, AQAD31, TAMD31, TMD31, AD41, AQAD41, TAMD41, and TMD41.
This air filter element serves as a direct aftermarket replacement for Volvo Penta part numbers 21646645 and 3582358, as well as Sierra part 18-7908.
- Engineered for direct-fit installation.
- Constructed with a durable paper filter element.
- Designed for use in diesel marine environments.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 21646645 |
| Volvo Penta | 3582358 |
| Sierra | 18-7908 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
Designed for a range of Volvo Penta diesel engines. Please verify your specific model is listed.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Volvo Penta | AD31 | 4-Stroke | 21646645/3582358 | Diesel engine | ||
| Volvo Penta | AQAD31 | 4-Stroke | 21646645/3582358 | Diesel engine | ||
| Volvo Penta | TAMD31 | 4-Stroke | 21646645/3582358 | Diesel engine | ||
| Volvo Penta | TMD31 | 4-Stroke | 21646645/3582358 | Diesel engine | ||
| Volvo Penta | AD41 | 4-Stroke | 21646645/3582358 | Diesel engine | ||
| Volvo Penta | AQAD41 | 4-Stroke | 21646645/3582358 | Diesel engine | ||
| Volvo Penta | TAMD41 | 4-Stroke | 21646645/3582358 | Diesel engine | ||
| Volvo Penta | TMD41 | 4-Stroke | 21646645/3582358 | Diesel engine | ||
| Volvo Penta | D31 | 4-Stroke | 21646645/3582358 | Diesel engine | ||
| Volvo Penta | D41 | 4-Stroke | 21646645/3582358 | Diesel engine |
Technical Specs
- Product Type
- Marine Engine Air Filter Insert
- Installation
- Direct replacement
- Fuel Type
- Diesel
- Housing Material
- Paper filter element
- Housing Color
- Yellow
- Dimensions
- 155mm diameter x 97.8mm height (6.14" x 3.85")
- Weight
- 258g (9.1 oz)
- Warranty
- 1 Year (aftermarket versions)
- Other Technical Attributes
- Inside diameter: 93.5mm (3.68")
What’s in the Box
- 1 x Air Filter Element (21646645/3582358)
Installation Notes
- Ensure the engine is off and cool to the touch.
- Locate the engine's air filter housing.
- Remove the housing cover, which may be secured with clips, wing nuts, or screws.
- Carefully take out the old air filter element, noting its orientation.
- Wipe the inside of the filter housing clean with a cloth to remove any debris.
- Insert the new air filter, ensuring it is seated correctly and forms a tight seal.
- Replace the housing cover and secure it firmly.
- Start the engine to ensure everything is running smoothly.
Troubleshooting & FAQ
How do I know if this air filter fits my engine?
This filter is designed for Volvo Penta 30-40 series diesel engines. Cross-reference your engine model and original part number with the compatibility tables on this page. The most reliable method is to match the OEM part number (21646645 or 3582358).
How often should I replace my engine's air filter?
Replacement intervals depend on operating conditions. For typical leisure use, annually or every 200 hours is a general guideline. In dusty or demanding environments, more frequent checks and changes are recommended. Always consult your engine's service manual.
What are the signs of a clogged or failing air filter?
Common symptoms include reduced engine performance, increased black smoke from the exhaust, lower fuel efficiency, and the engine struggling to reach full RPMs. A visual inspection may show a filter clogged with dirt and debris.
Can I clean and reuse this paper filter?
No. This is a disposable paper element filter. Attempting to clean it with compressed air or liquids can create microscopic tears, compromising its filtration ability and potentially allowing harmful particles into the engine.
What is the difference between this and an OEM part?
This is an aftermarket part designed to meet or exceed original equipment manufacturer (OEM) specifications for fit, form, and function. It offers a cost-effective solution without sacrificing performance or quality materials.
Is any special tool required for installation?
Generally, no special tools are needed. The air filter housing cover is typically secured by simple clips or wing nuts. In some cases, a basic screwdriver or wrench may be required.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
Payment methods
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