Shift Shaft Bushing – Fits MerCruiser MC-I, R, MR, Alpha One & Gen II Stern Drives (Replaces 23-805041A2)

Shift Shaft Bushing – Fits MerCruiser MC-I, R, MR, Alpha One & Gen II Stern Drives

This bell housing bushing kit is designed to fit MerCruiser stern drives, including the MC-I, R, MR, Alpha One, and Alpha One Generation 2 (Gen II) models produced up to serial number 0F094774 (approximately 1993). It contains the necessary components to repair leaking or worn shift shaft seals.

It serves as a direct replacement for multiple OEM and aftermarket part numbers, ensuring a reliable fit for a wide range of older MerCruiser drives. This kit enables you to update older MerCruiser models to the new-style shift shaft seal design.

• Installation Location: Mounts in the bell housing.
• Key Function: Updates older MerCruiser I, R, MR, and Alpha One drives to the newer, more reliable shift shaft seal design.
• Complete Kit: Includes two oil seals and both large and small bushings required for the repair.

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

• 2 x Oil Seal (Replaces 26-816464 / 26-8164641)
• 1 x Large Bushing
• 1 x Small Bushing

Installation Guide

1. Ensure the engine is off and the drive is in a safe, stable position for service.
2. Following the manufacturer's service manual, separate the sterndrive unit from the bell housing.
3. Carefully locate and identify the old shift shaft bushings and seals within the bell housing.
4. Press or pull out the existing bushings and seals. Take care not to scratch or damage the housing bore during removal.
5. Thoroughly clean the bore to remove any old sealant, corrosion, or debris.
6. Lightly lubricate the new bushings and seals with a suitable marine grease.
7. Carefully press the new large and small bushings into place, followed by the two new oil seals, ensuring correct orientation.
8. Reassemble the sterndrive to the bell housing, ensuring the shift linkage is correctly aligned.
9. Verify proper shifting operation before launching the vessel.

Troubleshooting & FAQ

How do I confirm this fits my engine?
This kit is designed for MerCruiser MC-I, R, MR, and Alpha One drives. For Alpha One Gen II models, it fits units produced up to serial number 0F094774 (approximately 1993). Please verify your drive model and serial number before ordering.

What are the signs my shift shaft bushing is failing?
Common symptoms include a gear lube leak from the shift shaft area on the bell housing, difficulty shifting, or excessive play in the shift mechanism. A visual inspection may reveal a deteriorated or damaged seal.

Why does this kit include two seals and two bushings?
This kit provides all the necessary components to service the shift shaft on the specified MerCruiser drives. It updates the older design, which may have used a single seal, to the more robust double-seal system for improved longevity and leak prevention.

OEM vs. Aftermarket?
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.

How fast do you ship and how much does it cost?
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.

What is your warranty and return policy?
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.