Mercury Bearing Removal and Installation Tool Kit – Fits Bravo & Alpha One Sterndrives (Replaces 91-31229A7)
Mercury Bearing Removal and Installation Tool Kit – Fits Bravo & Alpha One Sterndrives (Replaces 91-31229A7) 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
Mercury Bearing Removal and Installation Tool Kit – Fits Bravo &...
Product Details
This is a specialized Mercury Bearing Removal and Installation Tool Kit designed for removing and installing bearings in all Mercruiser Bravo gearcases. This comprehensive factory tool kit is compatible with a range of sterndrive models, including MC-I, R-MR, Alpha One, Alpha One Gen Two, and all Bravo Sterndrives.
This kit serves as a direct replacement for Mercury part numbers 91-31229A7 and 31229A7.
- Engineered for manual removal and installation of bearings.
- Constructed from high-strength metal for durability and long service life.
- Provides a complete set of drivers, pullers, and plates for Bravo gearcase maintenance.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 91-31229A7 |
| Mercury | 31229A7 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This tool kit is designed for use on the following Mercruiser sterndrive models.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercruiser | Alpha One | 91-31229A7 | ||||
| Mercruiser | Alpha One Gen Two | 91-31229A7 | ||||
| Mercruiser | Bravo One | 91-31229A7 | ||||
| Mercruiser | Bravo Two | 91-31229A7 | ||||
| Mercruiser | Bravo Three | 91-31229A7 | ||||
| Mercruiser | Bravo X One | 91-31229A7 | ||||
| Mercruiser | Bravo X Two | 91-31229A7 | ||||
| Mercruiser | Bravo X Three | 91-31229A7 | ||||
| Mercruiser | MC-I | 91-31229A7 | ||||
| Mercruiser | R-MR | 91-31229A7 |
Technical Specs
- Product Type
- Bearing Removal and Installation Tool Kit
- Installation
- Manual
- Housing Material
- Metal
- Dimensions
- 9.5 in (241.3 mm) H × 8.0 in (203.2 mm) W × 10.25 in (260.35 mm) L
- Weight
- 12.00 lb (5.44 kg)
- Warranty
- Standard Mercury Marine warranty
- Other Technical Attributes
- Tool kit for bearing installation and removal in all Bravo gearcases
What’s in the Box
- 1 x NUT .625-18 HEX (11-24156)
- 1 x WASHER-.656X1.312X.095, PLAIN (12-34961)
- 1 x TOOL-BEARING CARRIER (91-15755)
- 1 x PLATE 6 CYL PROP SHAFT ROLL B (91-29310)
- 1 x COLLAR NO. 3 BEARING INSTALL (91-303661)
- 1 x SHAFT-FWD GR BRG CUP PULLER (91-31229)
- 1 x HEAD-PULL ROD (91-32325)
- 1 x DRIVER-NEEDLE BEARING (91-32336)
- 1 x PULLER HD GEAR (91-36379)
- 1 x DRIVER HEAD (91-36569)
- 1 x WASHER-PILOT (91-36571)
- 1 x TOOL-ROLLER BRG REM & INSTALL (91-37292)
- 1 x HD-DRVR-PROP SHAFT NEEDLE BRG (91-37311)
- 1 x HD-DRVR-DR SHAFT NEEDLE BRG (91-37312)
- 1 x TOOL-DRIVER ROD, NEEDLE BRG (91-37323)
- 1 x WSHR-PILOT-NEEDLE BRG DRIVER (91-37324)
- 1 x WASHER-PILOT (91-37350)
- 1 x TOOL-BRG INSTALLATION (91-38628)
- 1 x DRIVER-NEEDLE BRG (91-52393)
- 1 x HEAD-PULL ROD (91-52394)
Installation Notes
- Always consult your sterndrive's official service manual before beginning any work.
- Safely disassemble the sterndrive unit to gain access to the gearcase and bearings.
- Examine the components and select the correct puller, driver, or plate from the kit for your specific bearing.
- Carefully use the puller tools to extract the old bearings from the housing without causing damage.
- Position the new bearings and use the appropriate driver tools from the kit to press them into place evenly.
- Reassemble all components, ensuring every part is torqued to the manufacturer's specified values.
Troubleshooting & FAQ
Which Mercruiser sterndrives is this kit compatible with?
This tool kit is designed for all Mercruiser Bravo gearcases and is also compatible with MC-I, R-MR, Alpha One, and Alpha One Gen Two sterndrives.
Does this kit include everything I need to replace the bearings?
This comprehensive kit includes a wide array of pullers, drivers, and plates for removing and installing bearings in Bravo gearcases. Please review the 'What's in the Box' section to ensure it has the specific tool for your job.
How do I know which tool to use for my specific bearing?
Always refer to your official Mercury/Mercruiser service manual. The manual will specify the correct tool part number required for each step of the bearing replacement process.
The part number on my old tool is 91-31229A7. Is this the right replacement?
Yes, this kit is a direct aftermarket replacement for Mercury OEM tool kit 91-31229A7.
What are the signs of a failing gearcase bearing?
Common signs include a grinding or rumbling noise from the sterndrive, excessive vibration, or the presence of metal shavings in the gear lube.
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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