U-Joint Bellows Kit – Fits MerCruiser Alpha One, MC-I, R, MR & TR/TRS Drives
U-Joint Bellows Kit – Fits MerCruiser Alpha One, MC-I, R, MR & TR/TRS Drives 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
U-Joint Bellows Kit – Fits MerCruiser Alpha One, MC-I, R, MR & ...
Product Details
This U-Joint Bellows Kit provides a crucial seal between the transom and outdrive, protecting the universal joint from water and debris. It is designed for a wide range of MerCruiser stern drive models, including the MC-I, R, MR, Alpha One, and TR/TRS series manufactured between 1972 and 1990.
It serves as a direct replacement for multiple OEM and aftermarket part numbers, including Mercury/Quicksilver 60932A4 (which supersedes 60932A1), Sierra 18-2751, and GLM 89050.
- Installs as a direct replacement for the original factory part.
- Kit includes the rubber bellows and necessary hose clamps for a complete installation.
- Engineered to protect the driveshaft U-joint assembly on specified MerCruiser models.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Mercury / Quicksilver | 60932A4 | Supersedes 60932A1 |
| Sierra | 18-2751 | |
| GLM | 89050 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For MerCruiser models, this bellows fits a wide array of sterndrives from the 1970s and 1980s. Verify your specific model and year range to ensure correct fitment.
| Model | Years | OEM Part No. | Notes |
|---|---|---|---|
| MC-I | 1972–1982 | 60932A4 | Supersedes 60932A1 |
| 120/140 (1.98 RATIO) | 1978–1982 | 60932A4 | Supersedes 60932A1 |
| 165 (1.65 RATIO) | 1978–1981 | 60932A4 | Supersedes 60932A1 |
| 470/485 (1.84 RATIO) | 1978–1982 | 60932A4 | Supersedes 60932A1 |
| 228 (1.50 RATIO) | 1978–1982 | 60932A4 | Supersedes 60932A1 |
| 260/898 (1.50 RATIO) | 1978–1982 | 60932A4 | Supersedes 60932A1 |
| R/MR/Alpha One Sterndrive | 1983–1990 | 60932A4 | Supersedes 60932A1 |
| TR (2.00 RATIO) | 1977–1993 | 60932A4 | Supersedes 60932A1 |
| TRS (1.50 RATIO) | 1977–1993 | 60932A4 | Supersedes 60932A1 |
Technical Specs
- Product Type
- U-Joint Bellows Kit
- Installation
- Direct replacement for factory part
- Housing Material
- Rubber
- Housing Color
- Black
- Connection
- Secured with included hose clamps
- Package Contents
- Rubber bellows with hose clamps
- Compatibility
- MerCruiser MC-I, R, MR, Alpha One, TR/TRS stern drives
- Year Range
- 1972–1990
- Installation Hardware
- Includes hose clamps for both ends
- Location
- Located between transom and outdrive
- Product Height
- 15.5
- Product Width
- 15.0
- Product Length
- 15.0
What’s in the Box
- 1 x U-Joint Bellows (Replaces 60932A4)
Installation Notes
- Ensure the engine is off, the drive is tilted up, and the battery is disconnected for safety.
- Remove the sterndrive assembly from the transom shield following the manufacturer's service manual procedures.
- Loosen and remove the old hose clamps securing the existing U-joint bellows.
- Carefully cut or pull the old bellows off the transom assembly and the sterndrive bell housing.
- Clean both mounting surfaces thoroughly to remove old sealant, rubber, and any corrosion.
- Apply a marine-grade adhesive or sealant to the mounting grooves.
- Slide the new bellows into position, ensuring it's properly seated on both ends.
- Install and tighten the new hose clamps securely over the grooves on both ends of the bellows. Do not overtighten.
- Check for a watertight seal before re-installing the sterndrive.
- Re-install the sterndrive, reconnect the battery, and test for proper function and leaks in the water.
Troubleshooting & FAQ
How do I know if my U-joint bellows needs replacing?
Common signs of a failing bellows include visible cracks, perishing rubber, or water inside your boat's bilge area near the transom. A leaking U-joint bellows can lead to catastrophic failure of the U-joints and gimbal bearing, so it should be inspected annually and replaced immediately if any damage is found.
Will this fit an Alpha One Gen 2 drive?
No. This bellows kit is specifically for older MerCruiser drives, including the Alpha One (Gen 1) up to 1990. Gen 2 drives, which began production in 1991, use a different part number. Please verify your drive model and year before ordering.
What is the recommended replacement interval for this part?
As a preventative maintenance item, it is recommended to inspect bellows annually and replace them every 3-5 years, depending on usage (freshwater vs. saltwater) and storage conditions. Exposure to sun, heat, and chemicals can shorten its lifespan.
Are the hose clamps included?
Yes, this kit includes the necessary hose clamps to secure both ends of the bellows, ensuring a complete and secure installation.
What common tools are required for installation?
Installation typically requires basic hand tools, such as socket wrenches, screwdrivers to remove the old clamps, a tool to clean the mounting surfaces, and a marine sealant applicator. You will also need the tools required to remove the sterndrive itself, as specified in your service manual.
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.
Payment & Security
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