Transom Seal – Fits MerCruiser Alpha One, R, MR, MC-1 (1983–1990) (Replaces 65533A1)

Transom Seal – Fits MerCruiser Alpha One, R, MR, MC-1 (1983–1990) (Replaces 65533A1)

This transom seal is designed for MerCruiser Alpha One Generation 1, R, MR, and MC-1 stern drive models manufactured from 1983 to 1990. It creates a robust, watertight barrier between the gimbal housing and the boat transom, preventing leaks and protecting critical drive components.

This part is a direct replacement for MerCruiser 65533A1, GLM 86712, and Sierra 18-2692.

• Installation Location: Mounts between the gimbal housing and the transom.
• Material: Constructed from a durable foam/rubber composite to ensure a lasting seal.
• Function: Sits near the perimeter of the gimbal ring mating surface for a secure fit.

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.

Technical Specifications

Package Contents

1 x Transom Gasket Seal (Replaces 65533A1)

Installation Guide

1. Safety First: Disconnect the battery and ensure the stern drive is properly supported before beginning work.
2. Remove Drive: Detach the stern drive assembly from the gimbal housing according to your service manual.
3. Access the Seal: Once the drive is removed, the gimbal housing and transom assembly will be accessible. Locate the old transom seal.
4. Remove Old Seal: Carefully peel or scrape away the old transom seal from the mounting surface.
5. Clean Surface: Thoroughly clean the mating surfaces on both the gimbal housing and the boat transom. Ensure they are free of old adhesive, sealant, and debris.
6. Install New Seal: Position the new transom gasket seal onto the transom, aligning it with the mounting holes.
7. Reassemble: Reinstall the gimbal housing and stern drive assembly, torquing all fasteners to the manufacturer's specifications.
8. Check for Leaks: After reassembly, lower the drive into the water and carefully inspect for any signs of leaks around the transom assembly.

Troubleshooting & FAQ

Q: How do I confirm this fits my engine?
A: This seal is designed specifically for MerCruiser Alpha One Gen 1, R, MR, and MC-1 models from 1983 to 1990. Please verify your model and year range against the "Compatible Engine Models" table. Cross-reference the OEM part number 65533A1 to ensure an exact match.

Q: What are the signs of a failing transom seal?
A: The most common sign of a failed transom seal is water leaking into the bilge area, especially when the boat is in the water. You may also notice corrosion around the inner transom plate or damage to the gimbal bearing from water intrusion.

Q: How often should I replace the transom seal?
A: The transom seal should be inspected regularly for signs of wear, cracking, or compression. It is typically replaced whenever the stern drive is removed for major service, such as gimbal bearing or bellows replacement, or immediately if a leak is detected.

Q: OEM vs. Aftermarket?
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.