Transom Seal Rebuild Kit – Fits Volvo Penta SX Stern Drives

Transom Seal Rebuild Kit – Fits Volvo Penta SX Stern Drives (Replaces 3853807, 3841481, 3850426, 3852560)

This transom seal rebuild kit is designed for Volvo Penta SX series stern drives, including SX, SX-C, SX-M, and SX-R models. Note: It is not compatible with SX-A drives.

This kit serves as a direct replacement for Sierra 18-2772-1, Mallory 9-72931, and JLM Marine 17400-87L00.

• Installation: Direct replacement for a precise fit.
• Included Components: The kit includes a gimbal bearing, U-joint bellow, exhaust bellow, and a complete sealing kit.
• Material: Bellows are made from durable, marine-grade rubber/neoprene to resist saltwater and harsh conditions.

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 Gimbal bearing (3853807)
• 1 x U-joint bellow (3841481)
• 1 x Sealing kit (3852560)
• 1 x Exhaust bellow (3850426)
• 1 x Clamp (various OEM part numbers)

Installation Guide

1. Safety First: Disconnect the boat's battery before beginning any work.
2. Remove Stern Drive: Carefully detach and remove the stern drive unit from the transom assembly.
3. Remove Old Components: Take off the old exhaust bellow, U-joint bellow, and their clamps. Remove the gimbal bearing from the housing.
4. Clean Surfaces: Thoroughly clean the transom housing and bell housing surfaces, removing any old sealant or debris.
5. Install New Bearing: Press the new gimbal bearing into the gimbal housing until it is properly seated.
6. Install New Bellows: Fit the new U-joint and exhaust bellows. Secure them with the provided clamps, ensuring a tight seal.
7. Install Sealing Kit: Install the components from the new sealing kit as required.
8. Reinstall Drive: Reattach the stern drive unit to the transom assembly, ensuring all connections are secure.
9. Final Check: Reconnect the battery. Once in the water, a thorough check for leaks is essential.

Troubleshooting & FAQ

How do I confirm this fits my engine?
This kit is designed specifically for Volvo Penta SX, SX-C, SX-M, and SX-R models. It is not compatible with SX-A drives. Always verify your stern drive model before purchasing to ensure proper fitment.

What are the signs that my transom seal needs replacing?
Common signs of failure include water leaking into the bilge area, visible cracks, tears, or brittleness in the bellows, or a noisy/rough feeling when turning the gimbal bearing.

How often should I replace my transom bellows?
It's recommended to inspect your bellows annually for any signs of wear, such as cracking or fatigue. For preventative maintenance, replacement is advised every 3-5 years, depending on usage and water conditions.

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.