Starter Motor – Fits Volvo Penta D4 & D6 Series (Replaces 21423488)
Starter Motor – Fits Volvo Penta D4 & D6 Series (Replaces 21423488) 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
Starter Motor – Fits Volvo Penta D4 & D6 Series (Replaces 21423...
Product Details
This is a direct-fit aftermarket Starter Motor – Fits Volvo Penta D4 & D6 Series, engineered for reliable performance in marine diesel environments. It is compatible with Volvo Penta D4 3.7L (180-300HP) and D6 5.5L (280-435HP) engines manufactured from 2010 onwards.
It serves as a direct replacement for Volvo Penta part numbers 21423488, 3803938, 3801296, 3588491, 874501, 3841359, and 3594614.
- Installs as a direct bolt-on replacement.
- Features a marine-grade moisture-proof covering to prevent water buildup.
- Designed for 12V diesel engine systems with a 3-bolt mounting connection.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 21423488 |
| Volvo Penta | 3803938 |
| Volvo Penta | 3801296 |
| Volvo Penta | 3588491 |
| Volvo Penta | 874501 |
| Volvo Penta | 3841359 |
| Volvo Penta | 3594614 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This starter is designed for specific Volvo Penta D4 and D6 diesel marine engines.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Volvo Penta | D4-180I-B/C/D/E | 180 | 4-Stroke | 2010–onwards | 21423488 | Marine engine |
| Volvo Penta | D4-210A-A/B, D4-210I-A/B | 210 | 4-Stroke | 2010–onwards | 21423488 | Marine engine |
| Volvo Penta | D4-225A-B/C/D/E, D4-225I-B/C/D/E | 225 | 4-Stroke | 2010–onwards | 21423488 | Marine engine |
| Volvo Penta | D4-260A-A/B/C/D/E, D4-260D-B/C/D/E, D4-260I-A/B/C/D/E | 260 | 4-Stroke | 2010–onwards | 21423488 | Marine engine |
| Volvo Penta | D4-300A-A/C/D/E, D4-300D-A/C/D/E, D4-300I-A/C/D/E | 300 | 4-Stroke | 2010–onwards | 21423488 | Marine engine |
| Volvo Penta | D6-280A-A/B/C/D/E, D6-280I-A/B/C/D/E | 280 | 4-Stroke | 2010–onwards | 21423488 | Marine engine |
| Volvo Penta | D6-310A-A/B/C/D/E, D6-310D-B/C/D/E, D6-310I-A/B/C/D/E | 310 | 4-Stroke | 2010–onwards | 21423488 | Marine engine |
| Volvo Penta | D6-330A-B/C/D/E, D6-330D-B/C/D/E, D6-330I-B/C/D/E | 330 | 4-Stroke | 2010–onwards | 21423488 | Marine engine |
| Volvo Penta | D6-350A-A/B | 350 | 4-Stroke | 2010–onwards | 21423488 | Marine engine |
| Volvo Penta | D6-370A-B/C/D/E, D6-370D-A/B/C/D/E, D6-370I-A/B/C/D/E | 370 | 4-Stroke | 2010–onwards | 21423488 | Marine engine |
| Volvo Penta | D6-400A-E | 400 | 4-Stroke | 2010–onwards | 21423488 | Marine engine |
| Volvo Penta | D6-435D-A/C/D/E, D6-435I-A/C/D/E | 435 | 4-Stroke | 2010–onwards | 21423488 | Marine engine |
Note: Not compatible with newer D4 models ending in "F" and D4/D6 models ending in "G".
Technical Specs
- Product Type
- Starter Motor
- Fuel Type
- Diesel
- Operating Voltage
- 12V
- Power Rating
- 3.6 kW
- Rotation
- Clockwise (CW)
- Number of Teeth
- 11
- Mounting Holes
- 3
- Hole Centers
- 90 mm
- Connection
- 3-bolt mounting
- Housing Material
- Metal alloy
- Housing Color
- Black
- Dimensions
- 445 mm x 245 mm x 190 mm
- Weight
- 9 kg (19.8 lbs)
- Warranty
- 1 year (aftermarket)
What’s in the Box
- 1 x Starter Motor Assembly (Replaces 21423488)
Installation Notes
- Disconnect the battery's negative and positive terminals to prevent electrical shorts.
- Locate the old starter motor on the engine block. Tag and disconnect the electrical wires connected to it.
- Remove the mounting bolts holding the starter in place and carefully extract the old unit.
- Clean the mounting surface on the engine block to ensure a secure, flush fit for the new starter.
- Position the new starter motor and tighten the mounting bolts to the manufacturer's recommended torque specifications.
- Reconnect the electrical wires to the correct terminals on the new starter.
- Reconnect the battery terminals, starting with the positive and then the negative.
- Test the new starter by starting the engine. Check for proper engagement and listen for any unusual noises.
Troubleshooting & FAQ
How do I confirm this starter fits my Volvo Penta engine?
This starter fits specific Volvo Penta D4 and D6 models from 2010 onwards. Please review the detailed "Engine & Model Compatibility" table. Crucially, note that it is not compatible with newer D4 models ending in "F" or D4/D6 models ending in "G". Always match the OEM part number 21423488 or its equivalents.
What are common signs of a failing starter motor?
Symptoms of a faulty starter include a distinct clicking sound when turning the key, slow or labored engine cranking, or the engine failing to crank at all despite having a fully charged battery.
Is this a genuine Volvo Penta part?
This is a high-quality aftermarket replacement, not a genuine OEM part. It is built to meet or exceed original equipment specifications for fit, form, and function, offering a reliable alternative to the manufacturer's part.
Is this starter for diesel or gasoline engines?
This unit is designed exclusively for the Volvo Penta D4 (3.7L) and D6 (5.5L) marine diesel engines specified in the compatibility list.
Does this starter require any special maintenance?
The starter motor is designed to be maintenance-free. However, ensuring all electrical connections are clean, tight, and free of corrosion will help guarantee long-term reliability and performance.
What is the difference between OEM and aftermarket parts?
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.
What are your shipping speed and cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
What is the warranty and return policy?
This part is 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 part 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
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