Shift Lever & Bushing Kit – Fits MerCruiser R MR Alpha I (Replaces 45518T1, 64518K, 45518T, 21144)

Product Details

This Shift Lever & Bushing Kit is designed for MerCruiser R, MR, and Alpha I stern drives manufactured between 1983 and 1990. It provides direct-fit replacement components to restore proper shifting operation in compatible MerCruiser applications.

This kit directly replaces OEM part numbers 45518T1, 64518K, 45518T, and 21144.

• Engineered for R/MR/Alpha I drive assemblies
• Includes shift lever and bushing components
• Compatible with 1983–1990 model year applications

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Engine & Model Compatibility

Confirm your engine model/year in the table below.

Technical Specs

Application

Shift lever and bushing assembly

Drive Type

Stern drive

Compatible Series

R, MR, Alpha I

Model Years

1983–1990

OEM Reference

45518T1

What's in the Box

• Shift lever
• Bushing

Installation Notes

1. Disconnect the battery and shift cable from the stern drive unit before beginning work.
2. Remove the old shift lever and inspect the mounting area for corrosion or damage.
3. Clean the mounting surface thoroughly and ensure all old bushing material is removed.
4. Install the new bushing into the shift lever housing, ensuring proper alignment.
5. Position the new shift lever and secure it according to manufacturer torque specifications.
6. Reconnect the shift cable and verify smooth operation through all gear positions.
7. Test shift function on land before launching to confirm proper installation.

Troubleshooting & FAQ

How do I know if my shift lever or bushing needs replacement?

Common signs include difficulty shifting gears, excessive play in the shift mechanism, grinding noises during gear changes, or visible wear on the bushing. If shifting feels loose or inconsistent, inspection and replacement are recommended.

Will this kit work on Alpha One Gen II drives?

No, this kit is specifically designed for R, MR, and Alpha I drives from 1983–1990. Alpha One Gen II drives require different components and are not compatible with this kit.

Do I need special tools to install this kit?

Basic hand tools are typically sufficient, including wrenches and screwdrivers. A torque wrench is recommended to ensure proper fastener tension. Refer to your service manual for specific torque values and procedures.

Can I install just the bushing without replacing the shift lever?

While the bushing can be replaced separately, this kit includes both components for complete restoration. If only the bushing is worn, you may use just that part, but replacing both ensures optimal performance and longevity.

What causes shift lever bushings to wear out?

Normal use, exposure to marine environments, corrosion, and friction over time all contribute to bushing wear. Regular maintenance and inspection can help identify wear before it affects shifting performance.

How often should this kit be replaced?

Replacement intervals vary based on usage and conditions. Inspect the shift mechanism annually and replace when you notice excessive play, binding, or difficulty shifting. High-use applications may require more frequent service.

Safety & Important Info

• Verify images/specifications against 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.