Lower Gimbal Housing Steering Pin – Fits MerCruiser Alpha One Gen II & Bravo Drives (Replaces 17-99353, 8M0073409)
Lower Gimbal Housing Steering Pin – Fits MerCruiser Alpha One Gen II & Bravo Drives (Replaces 17-99353, 8M0073409) 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.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Lower Gimbal Housing Steering Pin – Fits MerCruiser Alpha One Gen I...
Product Details
This Lower Gimbal Housing Steering Pin is a critical component for MerCruiser sterndrive systems, providing a secure connection point for the steering arm in the lower gimbal housing. It is designed to fit MerCruiser Alpha One Gen II models from 1991 and newer, along with all MerCruiser Bravo series drives.
This part is a direct replacement for Mercury/MerCruiser part numbers 17-99353 and 8M0073409, and also interchanges with UANOFCN 8M0073409, Heurofosh 8M0073409, and JLM Marine 17-99353/8M0073409.
- Engineered for direct OEM replacement installation.
- Constructed from high-strength steel for durability.
- Includes the necessary cotter pin and washer for a complete installation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury/MerCruiser | 17-99353/8M0073409 |
| UANOFCN | 8M0073409 |
| Heurofosh | 8M0073409 |
| JLM Marine | 17-99353/8M0073409 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Years | OEM Part No. |
|---|---|---|---|
| MerCruiser | Alpha One (Gen II) | 1991–1995 (0D469859-0F679999) | 17-99353/8M0073409 |
| MerCruiser | Alpha One (Gen II) | 1996–1997 (0F680000-0K999999) | 17-99353/8M0073409 |
| MerCruiser | Alpha One (Gen II) | 1998 and up (0L100040+) | 17-99353/8M0073409 |
| MerCruiser | R/MR/Alpha One Sterndrive | 1983–1990 (6225577-0F386995) | 17-99353/8M0073409 |
| MerCruiser | R/MR/Alpha One Transom Assembly | 1983–1990 (6216687-0F386995) | 17-99353/8M0073409 |
| MerCruiser | Blackhawk | 1994–1995 | 17-99353/8M0073409 |
| MerCruiser | Bravo | 0M100001-0W249999 | 17-99353/8M0073409 |
| MerCruiser | Bravo One | 0W250000 & Up | 17-99353/8M0073409 |
| MerCruiser | Bravo Drives | 0B664190-0F729999 | 17-99353/8M0073409 |
| MerCruiser | Bravo Sterndrives | 0F730000-0M100000 | 17-99353/8M0073409 |
| MerCruiser | Bravo Three | 0M100001-0W249999 | 17-99353/8M0073409 |
| MerCruiser | Bravo Three | 0W250000 & Up | 17-99353/8M0073409 |
| MerCruiser | Bravo Three | 0B664190-0F729999 | 17-99353/8M0073409 |
| MerCruiser | Bravo Three | 0F730000-0M100000 | 17-99353/8M0073409 |
| MerCruiser | Bravo Two | 0M100001-0W249999 | 17-99353/8M0073409 |
| MerCruiser | Bravo Two | 0W250000 & Up | 17-99353/8M0073409 |
| MerCruiser | Bravo Two | 0B664190-0F729999 | 17-99353/8M0073409 |
| MerCruiser | Bravo Two | 0F730000-0M100000 | 17-99353/8M0073409 |
| MerCruiser | Bravo X One | 0M100001-0W249999 | 17-99353/8M0073409 |
| MerCruiser | Bravo X One | 0W250000 & Up | 17-99353/8M0073409 |
| MerCruiser | Bravo X Three | 0M100001-0W249999 | 17-99353/8M0073409 |
| MerCruiser | Bravo X Three | 0W250000 & Up | 17-99353/8M0073409 |
| MerCruiser | Bravo X Two | 0M100001-0W249999 | 17-99353/8M0073409 |
| MerCruiser | Bravo X Two | 0W250000 & Up | 17-99353/8M0073409 |
| MerCruiser | Bravo XR One | 0W240000 & Up | 17-99353/8M0073409 |
| MerCruiser | Bravo XR One | 0L914990-0W239999 | 17-99353/8M0073409 |
| MerCruiser | Bravo XR Sportmaster | 0M906878 & Up | 17-99353/8M0073409 |
| MerCruiser | Bravo XR Sportmaster | 0M052945-0M906877 | 17-99353/8M0073409 |
| MerCruiser | Bravo XR Three | 0W240000 & Up | 17-99353/8M0073409 |
| MerCruiser | Bravo XZ One | 0L914990-0M999999 | 17-99353/8M0073409 |
| MerCruiser | Hi Performance Transom | 0W150003 & Up | 17-99353/8M0073409 |
| MerCruiser | Integrated Transom | 0M052768 & Up | 17-99353/8M0073409 |
| MerCruiser | Integrated Transom | All through 0M052767 | 17-99353/8M0073409 |
Technical Specs
- Product Type
- Lower Gimbal Housing Steering Pin
- Installation
- Direct OEM replacement
- Connection
- Mechanical pin with cotter pin and washer
- Housing Material
- Steel
- Housing Color
- Silver/Metallic
- Fitting Type
- Mechanical pin
- Warranty
- 1 Year (from select vendors)
- Other Technical Attributes
- Used in lower gimbal housing assembly
What’s in the Box
- 1 x Lower Steering Pin (17-99353/8M0073409)
- 1 x Cotter Pin (18-54929)
- 1 x Washer (12-32518)
Installation Notes
- Ensure the engine is turned off and the sterndrive is trimmed to a safe, accessible position.
- Locate the lower gimbal housing and identify the steering pin connecting the steering arm.
- Carefully remove the old cotter pin and washer from the existing steering pin.
- Using a suitable punch and hammer, drive the old steering pin out of the housing. Be mindful of surrounding components.
- Clean the pin bore in the gimbal housing and inspect it for any signs of excessive wear or damage.
- Align the steering arm with the housing and carefully insert the new Lower Gimbal Housing Steering Pin.
- Place the new washer onto the pin and secure it by inserting the new cotter pin, bending the legs to lock it in place.
- Once installed, turn the wheel lock-to-lock to ensure smooth, unobstructed steering action before operating the vessel.
Troubleshooting & FAQ
How do I know if this pin will fit my specific MerCruiser model?
This pin fits MerCruiser Alpha One Gen II drives from 1991 and newer, as well as all Bravo series drives. Please consult the detailed "Engine & Model Compatibility" table and match your drive model and serial number range to confirm fitment before ordering.
What are the signs of a failing gimbal steering pin?
Symptoms of a worn or failing steering pin include excessive "play" or looseness in your steering, clunking or popping sounds from the transom area when turning the wheel, and erratic steering behavior. A visual inspection may also reveal corrosion or obvious wear on the pin.
Is this a difficult part to replace myself?
For those with mechanical experience, the replacement is straightforward. However, the old pin can be seized due to corrosion, making it difficult to remove. We recommend consulting a service manual for your specific drive model or viewing a tutorial for guidance. Professional installation is always a safe option.
How often should this steering pin be inspected or replaced?
The steering pin should be inspected regularly as part of your annual drive service. It does not have a fixed replacement interval, but should be replaced immediately if you notice any signs of wear, corrosion, or excessive steering play.
Does this kit include all the necessary hardware for the job?
Yes, this is a complete kit that includes the lower steering pin, a new washer, and a new cotter pin. This ensures you have all the required components for a proper installation.
Is this aftermarket pin as strong as the original Mercury part?
Absolutely. This pin is manufactured from high-grade steel to meet or exceed original equipment manufacturer (OEM) specifications for hardness, tensile strength, and corrosion resistance, ensuring long-lasting and reliable performance.
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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