Starter Motor – Fits Mercruiser, Volvo Penta Marine Engines (Replaces 50-808011A05, 50-808011A4)
Starter Motor – Fits Mercruiser, Volvo Penta Marine Engines (Replaces 50-808011A05, 50-808011A4) 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 Mercruiser, Volvo Penta Marine Engines (Replac...
Product Details
This 12V PMGR-style Starter Motor – Fits Mercruiser, Volvo Penta Marine Engines (Replaces 50-808011A05, 50-808011A4) is designed for Mercruiser and Volvo Penta marine engines with GM V-8 blocks. It is compatible with 5.0L, 5.7L, 6.2L, 7.4L, and 8.2L displacements from 1987–2002.
This unit provides a direct interchange for Mercury Marine 50-808011A05/50-808011A4, Volvo Penta 3862985/21129980, Crusader RA122009, Sierra 18-5908, and Arco 30459.
- Installs in the top mount (bell housing) position.
- Features a counter-clockwise (CCW) rotation.
- This is a new aftermarket part, not a rebuilt unit.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury Marine | 50-808011A05 |
| Mercury Marine | 50-808011A4 |
| Volvo Penta | 3862985 |
| Volvo Penta | 21129980 |
| Crusader | RA122009 |
| Sierra | 18-5908 |
| Arco | 30459 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Mercury Marine / Mercruiser models, this starter fits a wide range of GM V-8 inboard engines (MIE) from the late 1980s through the early 2000s.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Mercruiser | 5.0L MIE | 230 | 4-Stroke | 1987–1988 | 50-808011A05 |
| Mercruiser | 5.7L MIE | 260 | 4-Stroke | 1987–1995 | 50-808011A05 |
| Mercruiser | 5.7L MIE | 260 | 4-Stroke | 1997–2001 | 50-808011A05 |
| Mercruiser | 5.7L EFI MIE | - | 4-Stroke | 1997 | 50-808011A05 |
| Mercruiser | 6.2L MPI MIE | - | 4-Stroke | 2002 | 50-808011A05 |
| Mercruiser | 6.2L MPI Horizon MIE | - | 4-Stroke | 2002 | 50-808011A05 |
| Mercruiser | 7.4L MIE | 340 | 4-Stroke | 1989–1996 | 50-808011A05 |
| Mercruiser | 7.4L MIE | - | 4-Stroke | 1992–1997 | 50-808011A05 |
| Mercruiser | 7.4L EFI & MPI MIE | - | 4-Stroke | 1995–1997 | 50-808011A05 |
| Mercruiser | 7.4L MPI MIE | - | 4-Stroke | 1998+ | 50-808011A05 |
| Mercruiser | 8.2L MIE | - | 4-Stroke | 1990–1996 | 50-808011A05 |
| Mercruiser | 8.2L MIE | - | 4-Stroke | 1993–1996 | 50-808011A05 |
| Mercruiser | 8.2L MPI MIE | - | 4-Stroke | 1996–1997 | 50-808011A05 |
| Mercruiser | 8.2L MPI MIE | - | 4-Stroke | 1998+ | 50-808011A05 |
| Mercruiser | 350 Mag MPI MIE | - | 4-Stroke | 1998+ | 50-808011A05 |
| Mercruiser | 350 Mag MPI MIE/Horizon | - | 4-Stroke | 1999–2001 | 50-808011A05 |
| Mercruiser | 454 Mag MPI MIE | - | 4-Stroke | 1998+ | 50-808011A05 |
For Volvo Penta, this starter fits specific 5.7L and 8.1L models from 2000–2007.
| Brand | Model | Stroke | Years | OEM Part No. |
|---|---|---|---|---|
| Volvo Penta | 5.7GiL/GSiL/GXiL | 4-Stroke | 2000–2007 | 21129980/3862985 |
| Volvo Penta | 8.1GiL/GSiL/GXiL | 4-Stroke | 2000–2007 | 21129980/3862985 |
Technical Specs
- Product Type
- PMGR Starter Motor
- Installation
- Top Mount (Bell Housing)
- Voltage
- 12 Volts
- Rotation
- Counter-Clockwise (CCW)
- Teeth
- 9-Tooth Pinion Gear
- Gear OD
- 25.5mm (1.004 in)
- Mounting
- Dual 12.3mm Unthreaded Mounting Ears
- Power Rating
- 1.4 kW
- Dimensions
- 31.5cm × 20.0cm × 14.0cm
- Weight
- 4.5 kg (9.9 lbs)
- OEM Status
- Aftermarket Replacement (New, Not Rebuilt)
- Housing Color
- Black
What’s in the Box
- 1 x Starter Motor Assembly
Installation Notes
- Disconnect the battery leads (negative first) to prevent electrical shorts.
- Locate and label the existing starter's wiring for correct reinstallation.
- Disconnect the electrical connections from the old starter motor.
- Remove the mounting bolts securing the starter to the engine block or bell housing.
- Carefully remove the old starter. Compare it with the new unit to ensure an exact match.
- Position the new starter and fasten the mounting bolts to the manufacturer's torque specifications.
- Reconnect the electrical wiring as labeled in step 2. Ensure connections are clean and tight.
- Reconnect the battery leads (positive first, then negative).
- Test the new starter by starting the engine. Listen for smooth and consistent engagement.
Troubleshooting & FAQ
How do I confirm this starter fits my engine?
The best way is to compare your original part number to the cross-references in our Part Number Matrix. Additionally, check your engine model and year against the compatibility tables. Visually comparing your old starter to our product photos and specifications is also a critical final step.
What are the signs of a failing starter motor?
Common symptoms include a clicking sound when you turn the key, grinding noises during cranking, slow or labored engine cranking, or the engine failing to crank at all. A failing starter can also intermittently work fine before failing completely.
Is this a new or rebuilt starter?
This is a brand new, aftermarket starter motor. It is not rebuilt or remanufactured, ensuring all components are new for maximum reliability and service life.
Can I install this starter myself?
While installation is possible for those with mechanical experience, we recommend professional installation. This ensures the starter is mounted correctly, torqued to spec, and all electrical connections are secure, preventing potential damage to the starter or your engine's electrical system.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials. Our parts are manufactured in an ISO 9002 facility and are batch-inspected for consistency and quality.
Shipping speed & cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free for most regions, with expedited options available at checkout where applicable.
Warranty & returns?
This starter is covered by a 1-year warranty against manufacturing defects under normal marine use. If an issue arises, contact our support team with your order details. Returns are accepted within our standard window for unused parts in their original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against 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 quality control.
Payment & Security
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