Transom Seal Service Kit – Fits Volvo Penta SX/DP & OMC Cobra Stern Drives (Replaces 3854127, 914036, 3850426)

Transom Seal Service Kit – Fits Volvo Penta SX/DP & OMC Cobra Stern Drives (Replaces 3854127, 914036, 3850426)

This complete transom seal service kit provides all the necessary components to overhaul the stern drive bellows on Volvo Penta SX and DP series drives, as well as OMC Cobra drives. It is designed to meet or exceed OEM specifications to protect your vessel's transom from seawater corrosion and damage.

Engineered for a direct fit, this kit simplifies maintenance by replacing worn or cracked bellows, a critical failure point that can lead to catastrophic water intrusion. This assembly restores the integrity of the transom seal, ensuring the protection of the U-joints, gimbal bearing, and drive components.

• Complete Kit: Includes U-joint, exhaust, and shift cable bellows, plus a new gimbal bearing, gaskets, seals, and clamps.
• Direct Installation: Components are designed for a clamp-on fit, matching OEM housing and connection points for a secure seal.
• Durable Materials: Made from high-grade marine neoprene rubber to withstand the harsh marine environment and resist degradation from UV, oil, and saltwater.

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 Johnson/Evinrude owners, here’s a guide to help you identify your engine’s serial/model: Johnson/Evinrude Serial Number Guide.

Volvo Penta

OMC (Johnson/Evinrude)

Technical Specifications

Package Contents

• 1 x U-Joint Bellow (Replaces 3854127, 3841481, 22197130)
• 1 x Exhaust Bellow (Replaces 3850426, 914036)
• 1 x Shift Cable Bellow (Replaces 911826)
• 1 x Gimbal Bearing (Replaces 3853807)
• 1 x Water Inlet Hose (Replaces 911830)
• 1 x Outdrive Mounting Gasket Kit (508105)
• 1 x Oil Seal (Replaces 3852548, 911823)
• 4 x Clamps
• 3 x Zip Ties

Installation Guide

Professional installation is highly recommended. The general steps are outlined below:

1. Safety First: Disconnect the boat battery and ensure the boat is securely positioned on a trailer or lift.
2. Remove Stern Drive: Trim the drive up, remove the trim cylinder pins, and detach the stern drive unit from the transom assembly.
3. Remove Old Components: Remove the old exhaust, u-joint, and shift cable bellows. This will require cutting the existing clamps.
4. Extract Gimbal Bearing: Use a slide hammer with a bearing puller attachment to remove the old gimbal bearing from the housing.
5. Clean Surfaces: Thoroughly clean the transom assembly housing and all mating surfaces to remove old sealant and debris.
6. Install New Bearing: Seat the new gimbal bearing using a bearing installation tool. Ensure it is properly aligned.
7. Install Bellows: Install the new shift cable, u-joint, and exhaust bellows. Secure them with the provided clamps, ensuring a watertight seal.
8. Install Water Hose: Replace the raw water inlet hose.
9. Reinstall Drive: Mount the stern drive back onto the transom assembly, reconnecting all components.
10. Final Checks: Once installed, lower the drive into the water and check thoroughly for any leaks before operating the vessel.

Troubleshooting & FAQ

Q: How do I confirm this kit will fit my stern drive?
A: This kit is compatible with Volvo Penta SX and DP series drives from 1986 to present, and OMC Cobra drives (non-cone clutch models) from 1986–1993. Verify your drive model and year against the compatibility tables. Cross-referencing the OEM part numbers listed (e.g., 3854127, 914036) with your existing parts is the best way to ensure a match.

Q: What are the signs that my transom seals need to be replaced?
A: Common signs of failure include water leaking into the bilge area, visible cracks or holes in the rubber bellows, a grinding or roaring noise from the gimbal bearing when turning the wheel, or stiffness in the steering.

Q: How often should I replace the transom bellows?
A: For preventative maintenance, it is recommended to inspect all bellows annually and replace them every 3-5 years, depending on usage (saltwater vs. freshwater) and storage conditions. They should be replaced immediately if any signs of wear, cracking, or damage are found.

Q: Is this an OEM or aftermarket part?
A: This is an aftermarket replacement part, not an OEM component. We build our parts to meet or exceed OEM specifications using comparable, high-grade materials in an ISO9002-certified facility. Each batch is inspected to ensure consistent performance and quality.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping, with most orders arriving within 5–15 days worldwide. Standard shipping is free. Expedited options are available at checkout and vary by location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If you encounter an issue, contact our support team with your order details. Returns are accepted for unused items in their original condition within our standard return window; please see our official policy page or contact us for instructions.

Important Notes

• Please verify that the product images and specifications match your existing part before ordering. If you find any discrepancies, do not proceed with the purchase, even if your model is listed.
• This product is an aftermarket replacement part and is not an OEM component. All references to OEM brand names and part numbers are for cross-reference purposes only.
• Professional installation is strongly recommended to ensure safety, prevent damage, and guarantee optimal performance. Incorrect installation can lead to component failure and water damage.

Why Choose JLM MARINE?

• Quality Assured: With over 20 years of experience as a manufacturer, we are a trusted supplier to top marine brands and service centers globally.
• Fast Global Shipping: We offer free, reliable delivery worldwide, with most orders arriving in 5–15 days.
• Direct from Manufacturer: By eliminating the middleman, we provide competitive pricing without ever compromising on quality or performance.