Lower Steering Pin – Fits MerCruiser Alpha/Bravo Drives (Replaces 17-8M0073409, 17-99353)
Lower Steering Pin – Fits MerCruiser Alpha/Bravo Drives (Replaces 17-8M0073409, 17-99353) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Lower Steering Pin – Fits MerCruiser Alpha/Bravo Drives (Replaces 1...
Product Details
This aftermarket Lower Steering Pin is designed for MerCruiser Alpha One Gen II and Bravo sterndrive applications. It secures the lower portion of the gimbal housing, providing a critical pivot point for the steering system to ensure smooth and responsive handling.
It serves as a direct replacement for Mercury OEM part numbers 17-8M0073409 and 17-99353.
- Engineered for direct-fit installation.
- Constructed from high-strength metal for durability in marine environments.
- Includes the essential steering pin kit for a complete replacement.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| Brand | Part Number |
|---|---|
| Mercury | 17-8M0073409 |
| Mercury | 17-99353 |
Engine & Model Compatibility
Confirm your engine model in the table below.
| Brand | Model | OEM Part No. | Notes |
|---|---|---|---|
| MerCruiser | Alpha One Gen II | 17-8M0073409, 17-99353 | Lower Swivel Pin |
| MerCruiser | Bravo Drives | 17-8M0073409, 17-99353 | Lower Swivel Pin |
Technical Specs
- Product Type
- Lower Steering Pin
- Installation
- Direct Replacement
- Housing Material
- Metal
- Dimensions
- 10.0" L x 10.0" W x 3.0" H
- Fitting Type
- Lower Gimbal Housing Pin
- Engine Type
- MerCruiser Alpha One Gen II and Bravo Sterndrive
- Warranty
- 1 Year (Aftermarket)
What’s in the Box
- 1 x Lower Gimbal Housing Steering Pin Kit
Installation Notes
- Disconnect the boat's battery and trim the sterndrive to the full "up" or "trailer" position for access.
- Securely support the sterndrive to prevent it from dropping unexpectedly during the procedure.
- Locate and remove the hardware securing the old lower steering pin. The pin may be tight and require a puller tool.
- Thoroughly clean the pin bore in the gimbal housing, removing any old grease, corrosion, or debris.
- Liberally apply marine-grade grease to the new steering pin and its associated seals or O-rings.
- Align and insert the new steering pin into the gimbal housing, ensuring it is fully and correctly seated.
- Reinstall all hardware, torque to manufacturer specifications, lower the drive, and verify smooth steering operation.
Troubleshooting & FAQ
What are the signs my lower steering pin is failing?
Common symptoms of a worn or failing steering pin include excessive play or "slop" in the steering wheel, clunking noises when turning, and difficulty maintaining a straight course. A visual inspection may also reveal corrosion or looseness at the pivot point.
Will this pin fit all MerCruiser Bravo drives (Bravo I, II, and III)?
This pin is listed as compatible with the general "Bravo Drives" series. However, it is always best to verify the specific OEM part number (17-8M0073409 or 17-99353) required for your exact drive model and year before ordering.
Is a special tool required for installation?
In some cases, the old steering pin can be seized due to corrosion, requiring a specialized puller tool for removal without damaging the gimbal housing. Professional installation is often recommended if you do not have the correct tools.
What kind of grease should be used during installation?
Use a high-quality, water-resistant marine grease, such as Mercury 2-4-C or an equivalent product, on the pin and seals to ensure smooth operation and prevent corrosion.
How often should the steering pin be inspected or replaced?
Inspect the steering system, including the steering pin, annually as part of regular sterndrive maintenance. Replace it immediately if you notice any signs of wear, corrosion, or excessive play. There is no fixed replacement interval; it depends on usage and operating conditions (especially in saltwater).
Is this part for the upper or lower gimbal housing position?
This is the lower steering pin, also referred to as the lower swivel pin, which fits into the lower section of the gimbal housing.
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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