Transom Gasket Seal – Fits MerCruiser Alpha 1 Gen 2 & All Bravo Engines (Replaces 43713)

Transom Gasket Seal – Fits MerCruiser Alpha 1 Gen 2 & All Bravo Engines (Replaces 43713)

This transom gasket seal provides a reliable, watertight fit for Mercury MerCruiser Alpha One Gen II (1991-2002) and Bravo I, II, & III (1988-2002) stern drive transom assemblies.

Engineered to meet or exceed OEM specifications, this seal is a direct replacement for MerCruiser 43713, Sierra 18-2724, GLM 86711, Mallory 9-72420, and UanofCn 43713, ensuring a precise fit and durable performance.

• Material: Made from high-quality, marine-grade CR rubber for superior resistance to water, oil, and weathering.
• Function: Mounts between the transom and gimbal housing to create a critical watertight seal, preventing water from entering the bilge.
• Includes: One (1) transom gasket seal.

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

• 1 x Transom Gasket Seal (Replaces 43713)

Installation Guide

1. Safely secure the vessel and tilt the stern drive to the full "up" position for access.
2. Disconnect the components attached to the gimbal housing, such as shift cables and trim senders.
3. Remove the nuts and bolts securing the gimbal housing to the transom assembly.
4. Carefully separate the gimbal housing from the transom to expose the old gasket seal.
5. Remove the old gasket and thoroughly clean both mounting surfaces of any old sealant or debris.
6. Position the new transom gasket seal onto the transom assembly, ensuring it is properly aligned.
7. Re-install the gimbal housing, tightening the fasteners to the manufacturer's recommended torque specifications.
8. Reconnect all cables and sensors, and check for proper operation.

Troubleshooting & FAQ

Q: How do I confirm this fits my MerCruiser engine?
A: This seal fits MerCruiser Alpha One Gen II drives (1991-2002, Serial # 0D469859 & Up) and all Bravo I, II, & III drives (1988-2002, Serial # 0B664190 & Up). Always verify your drive model and serial number against the compatibility details provided before ordering.

Q: What are the signs of a failing transom gasket seal?
A: Key signs include water leaking into the bilge area from around the transom assembly, especially when the boat is in the water. You may also see visible cracking, hardening, or deterioration of the existing rubber seal.

Q: Where exactly is this part installed?
A: This gasket is installed between the outer transom plate and the gimbal housing. It creates a critical watertight seal to prevent water from entering the boat's hull.

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.