Transom Gasket Seal – Fits MerCruiser Alpha One Gen 2 and Bravo Drives (Replaces 43713)

Transom Gasket Seal – Fits MerCruiser Alpha One Gen 2 and Bravo Drives (Replaces 43713)

This transom gasket seal ensures a watertight fit between the stern drive gimbal assembly and the boat transom. It is designed for a wide range of MerCruiser stern drives, including Alpha One Gen 2 (1991–2002), Bravo I/II/III (1988–2002), and Blackhawk (1994–1995) models.

This component directly replaces MerCruiser part number 43713 and several other aftermarket equivalents.

• Installation Location: Mounts between the gimbal housing and the boat transom to prevent water intrusion.
• Quality Manufacturing: Produced in an ISO9002 certified facility to meet or exceed OEM specifications.
• Material: Durable rubber construction for a long-lasting, reliable 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

This package includes the following item:

• 1 x Transom Gasket Seal (43713)

Installation Guide

1. Safety First: Disconnect the boat's battery before beginning any work.
2. Remove Drive: Detach the stern drive unit from the transom assembly according to the manufacturer's service manual.
3. Access the Seal: Remove the gimbal housing assembly to expose the old transom gasket seal.
4. Prepare Surface: Carefully remove the old, worn gasket. Thoroughly clean the mounting surfaces on both the transom and the gimbal housing, ensuring they are free of old adhesive, sealant, and debris.
5. Install New Seal: Position the new gasket seal correctly onto the transom assembly.
6. Reassemble: Reinstall the gimbal housing, tightening bolts to the specified torque to ensure a uniform, watertight seal.
7. Reattach Drive: Mount the stern drive unit back onto the transom assembly.
8. Final Check: Reconnect the battery. After launching the boat, check the bilge area for any signs of water leaks around the transom.

Troubleshooting & FAQ

How do I confirm this transom seal fits my specific engine?
First, check your engine model and year against our compatibility table. It is critical to also verify your engine's serial number falls within the specified ranges. Cross-referencing the OEM part number (43713) with your old part or service manual is the best way to guarantee a match.

What are common signs that my transom gasket is failing and needs replacement?
The most common sign of a failed transom gasket is water leaking into the bilge area from the transom cutout. Upon inspection, you may also see visible cracks, deformation, or hardening of the rubber material on your existing seal.

How often should I replace the transom gasket seal?
There is no fixed replacement interval, but the transom gasket should be inspected during regular service. It is highly recommended to replace it whenever you are servicing or replacing the gimbal bearing, U-joints, or performing any major overhaul on the transom assembly.

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.