91-31107T Shift Shaft Bushing Tool for Mercury | JLM Marine

Shift Shaft Bushing Tool – Fits Mercury Outboard 115-200 HP

This professional-grade shift shaft bushing tool is designed for Mercury outboard engines ranging from 115 to 200 HP. Essential for servicing and maintaining your lower unit, this tool ensures precise installation and removal of shift shaft bushings during rebuild and repair operations.

Direct Replacement For: Mercury 91-31107T, 91-31107, 91-23033T, 91-23033, 91-24150 | Sierra 18-9817 | GLM 90140. Manufactured from high-strength forged steel with zinc-nickel alloy plating for superior corrosion resistance and durability.

• Constructed from hardened forged steel for maximum strength and toughness
• Zinc-nickel plated finish withstands high temperatures and harsh marine environments
• Meets or exceeds OEM quality standards

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here's a guide to help you identify your engine's serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Technical Specifications

Package Contents

Package contains the following components:

• 1 × Shift Shaft Bushing Tool

Note: The package contains all the parts shown in the picture.

Installation Guide

1. Preparation: Ensure the lower unit is removed from the outboard and positioned securely on a clean workbench.
2. Access the Shift Shaft: Disassemble the lower unit housing according to your service manual to expose the shift shaft and bushing area.
3. Removal: Insert the shift shaft bushing tool into the existing bushing. Apply steady, even pressure to extract the old bushing from its housing.
4. Clean the Housing: Thoroughly clean the bushing bore and shift shaft to remove any debris, corrosion, or old lubricant.
5. Inspect Components: Check the shift shaft for wear or damage. Replace if necessary before installing the new bushing.
6. Position New Bushing: Align the new shift shaft bushing with the housing bore, ensuring proper orientation per your service manual.
7. Installation: Use the bushing tool to press the new bushing into place with controlled, even force until fully seated.
8. Verify Seating: Confirm the bushing is flush and properly positioned within the housing.
9. Lubrication: Apply marine-grade grease to the shift shaft and bushing as specified in your service manual.
10. Reassembly: Reinstall all lower unit components in reverse order of disassembly, following torque specifications.
11. Function Test: Before reinstalling the lower unit, manually test shift shaft movement to ensure smooth operation.
12. Final Check: Once the lower unit is mounted, perform a complete shift mechanism test in neutral, forward, and reverse.

Troubleshooting & FAQ

Q: How do I know if this tool fits my Mercury outboard?
A: This tool is designed for Mercury outboards from 115 to 200 HP that use shift shaft bushings. Verify your engine's HP rating and cross-reference the OEM part numbers (91-31107T, 91-31107, 91-23033T, 91-23033, 91-24150) with your service manual or parts diagram before purchasing.

Q: Can I use this tool for both bushing removal and installation?
A: Yes, this shift shaft bushing tool is designed for both removing worn bushings and installing new replacements. Apply steady, controlled pressure in either direction to avoid damaging the housing or shift shaft.

Q: What makes this tool better than improvised methods?
A: This purpose-built tool ensures precise alignment and even pressure distribution, preventing damage to the lower unit housing or shift shaft. Improvised tools can cause scoring, cracking, or misalignment that leads to costly repairs.

Q: Do I need any special equipment to use this tool?
A: While the tool itself is designed for manual operation, you may need a press or mallet for adequate force during installation. Always follow your engine's service manual procedures for best results.

Q: What are the signs that I need to replace my shift shaft bushing?
A: Common symptoms include difficulty shifting gears, excessive play in the shift shaft, grinding or binding during shifts, or visible wear and corrosion on the bushing during lower unit inspection.

Q: Is this an OEM or aftermarket tool?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.