Power Steering Pump – Fits MerCruiser, Volvo Penta, OMC 4.3L-5.7L (Replaces 16792A39, 3863130, 3888323)
Power Steering Pump – Fits MerCruiser, Volvo Penta, OMC 4.3L-5.7L (Replaces 16792A39, 3863130, 3888323) is backordered and will ship as soon as it is back in stock.
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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).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Power Steering Pump – Fits MerCruiser, Volvo Penta, OMC 4.3L-5.7L (...
Product Details
This is a direct-fit Power Steering Pump – Fits MerCruiser, Volvo Penta, OMC 4.3L-5.7L (Replaces 16792A39, 3863130, 3888323) designed for a wide range of gasoline sterndrive engines. It is compatible with MerCruiser 4.3L to 7.4L Alpha/Bravo models, Volvo Penta 4.3L to 5.7L models, and OMC 4.3L to 5.7L V6/V8 packages. Please verify your original pump has the return hose fitting on the bottom of the plastic reservoir and an O-ring seal on the high-pressure line.
The unit serves as a direct interchange for MerCruiser 16792A39, Volvo Penta 3863130 / 3888323, OMC 71317A1, and Sierra 18-7508, among others. It is engineered to meet or exceed original equipment specifications for reliable steering performance.
- Installs as a direct replacement for listed OEM part numbers.
- Features a cast metal housing with a durable plastic reservoir.
- Connection type is an O-Ring seal for the high-pressure line, and the return hose connects to the bottom of the reservoir.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| MerCruiser | 16792A39 |
| MerCruiser | 16792A1 |
| MerCruiser | 16792A33 |
| Volvo Penta | 3863130 |
| Volvo Penta | 3888323 |
| OMC | 71317A1 |
| OMC | 90507A3 |
| OMC | 7830247 |
| Sierra | 18-7508 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For MerCruiser applications, this pump fits a variety of Alpha and Bravo sterndrives. It is critical to confirm the return line location on select 7.4L models.
For Volvo Penta and OMC models, always check that your existing pump’s return line connects to the bottom of the reservoir, as configurations can vary.
| Brand | Model | Engine | HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | 4.3L V6 | 262 CID | 4.3L | 4-Stroke | 16792A39 | Alpha/Bravo Applications |
| MerCruiser | 4.3LX | 262 CID | 4.3L | 4-Stroke | 16792A39 | Alpha/Bravo Applications |
| MerCruiser | 5.0L | 305 CID | 5.0L | 4-Stroke | 16792A39 | Alpha/Bravo Applications |
| MerCruiser | 5.7L | 350 CID | 5.7L | 4-Stroke | 16792A39 | Alpha/Bravo Applications |
| MerCruiser | 350 MAG | 350 CID | 5.7L | 4-Stroke | 16792A39 | Alpha/Bravo Applications |
| MerCruiser | 350 MAG MPI | 350 CID | 5.7L | 4-Stroke | 16792A39 | Alpha/Bravo Applications |
| MerCruiser | 377 MAG | 377 CID | 6.2L | 4-Stroke | 16792A39 | Alpha/Bravo Applications |
| MerCruiser | 7.4L | 454 CID | 7.4L | 4-Stroke | 16792A39 | Only select models with compatible return line location |
| Volvo Penta | 4.3GL/GI/GSi | 262 CID | 4.3L | 4-Stroke | 3863130/3888323 | Check pump return line location |
| Volvo Penta | 5.0GL/GI/GSi | 305 CID | 5.0L | 4-Stroke | 3863130/3888323 | Check pump return line location |
| Volvo Penta | 5.7GL/GI/GSi | 350 CID | 5.7L | 4-Stroke | 3863130/3888323 | Check pump return line location |
| OMC | V6 Models | 262 CID | 4.3L | 4-Stroke | 71317A1/90507A3 | Check pump return line location |
| OMC | V8 Models | 305/350 CID | 5.0/5.7L | 4-Stroke | 71317A1/90507A3 | Check pump return line location |
Technical Specs
- Product Type
- Power Steering Pump
- Installation
- Direct Replacement
- Connection
- O-Ring Seal for High-Pressure Line
- Housing Material
- Cast Metal with Plastic Reservoir
- Housing Color
- Black
- Fitting Type
- Return Hose from Bottom of Reservoir
- Warranty
- Varies by Retailer (1 Year Standard)
- Other Technical Attributes
- Compatible with models where the high-pressure line has an O-ring at the end
What’s in the Box
- 1 x Power Steering Pump (16792A39/3863130/3888323)
Installation Notes
- Disconnect the vessel's battery to prevent electrical hazards.
- Place an oil drain pan under the pump to catch fluid.
- Loosen and remove the serpentine belt from the pump pulley.
- Disconnect the high-pressure and low-pressure (return) lines from the old pump. Be prepared for fluid spillage.
- Unbolt and remove the old power steering pump from its mounting bracket.
- Transfer the pulley from the old pump to the new pump if not included. Use a proper pulley puller/installer tool to avoid damage.
- Install the new pump onto the mounting bracket and torque bolts to manufacturer specifications.
- Reconnect the high-pressure and return lines. Ensure the O-ring on the pressure line is properly seated.
- Reinstall the serpentine belt, ensuring it is tensioned correctly.
- Fill the reservoir with the manufacturer-recommended power steering fluid.
- Reconnect the battery. Start the engine and slowly turn the steering wheel lock-to-lock several times to bleed air from the system.
- Check for leaks and top off the fluid level as needed.
Troubleshooting & FAQ
How do I confirm this pump fits my engine?
The most important checks are physical. Verify that your current pump has a plastic reservoir where the return line connects to the bottom. Also, confirm the high-pressure line connecting to the pump uses a rubber O-ring for its seal, not a flared fitting.
What are the signs my power steering pump is failing?
Common symptoms include a whining or groaning noise that changes with engine RPM, difficulty steering (especially at low speeds), or visible fluid leaks from the pump or hoses.
Can I reuse my old pulley?
Yes, in most cases the original pulley must be transferred to the new pump. A specialized pulley puller and installer tool is required to do this without damaging the pump or pulley.
What type of fluid should I use?
Always consult your engine's service manual for the correct power steering fluid specification. Using the wrong fluid can cause damage to the steering system.
What is the difference between an O-ring and a flared fitting?
This pump is for systems where the high-pressure hose fitting has a small rubber O-ring at the end to create a seal. Older systems used a flared metal tube that seats directly into the pump. The two are not interchangeable.
Is this pump difficult to install?
Installation is straightforward for a mechanically inclined individual with the correct tools, particularly a pulley puller/installer and a serpentine belt tool. If you are unsure, professional installation is recommended to prevent damage.
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.
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