Aftermarket Exhaust Bellows Kit for OMC Volvo Penta 3852741 3863450

Aftermarket Exhaust Bellows Kit for OMC Volvo Penta Marine Engines

This is anexhaust bellows kit for OMC and Volvo Penta stern drive engines, serving as a direct replacement for part numbers 3852741 and 3863450. This two-piece kit provides the essential sealing components for reliable operation, protecting the engine from water intrusion and exhaust system failures.

Manufactured from a EPDM rubber compound, these bellows offer exceptional resistance to marine environmental conditions, including saltwater, ozone, and extreme temperatures. Each component is produced in an ISO9002 certified facility and undergoes rigorous testing to ensure dimensional accuracy and material integrity, meeting or exceeding OEM specifications.

• Kit Contains: Two exhaust bellows and stainless steel clamps.
• Function: Seals the exhaust passage between the transom and the stern drive.
• Compatibility: Fits a wide range of OMC and Volvo Penta engines from 1986-1993 and beyond.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM andbrands.

Compatible Engine Models

Confirm your engine model/year in the table below.

OMC / Johnson / Evinrude Applications (1986-1993)

Volvo Penta Applications

Gasoline Engines (1986-1991)

Diesel Engines

Technical Specifications

Package Contents

• This is a combined kit containing two different bellows: 1x Part Number 3852741 and 1x Part Number 3863450.
• 4x Stainless steel mounting clamps
• Installation hardware
• Detailed installation instructions sheet
• Technical support access information

Installation Guide

1. Preparation: Remove the stern drive unit from the transom assembly to access the bellows mounting locations.
2. Surface Cleaning: Thoroughly clean both mounting surfaces on the stern drive and transom. Remove all old adhesive, sealant, and any corrosion or marine growth.
3. Inspect Surfaces: Check the cleaned surfaces for any damage, deep scratches, or irregularities that could prevent a proper seal.
4. Apply Adhesive: Apply a thin, even layer of marine-grade bellows adhesive to both mounting surfaces.
5. Position Bellows: Use a bellows expander tool to stretch the new bellows and carefully slide them into position. Ensure they are properly seated without any folds or twists.
6. Secure Clamps: Position the stainless steel clamps over the bellows ends and tighten them securely with a 5/16" nut driver. Ensure even pressure and do not overtighten.
7. Final Check: Verify the bellows are correctly aligned and the clamps are torqued to specification before reinstalling the stern drive.

Troubleshooting & FAQ

How do I know if my exhaust bellows are failing?
Common symptoms include water intrusion in the bilge (a critical failure), excessive exhaust noise when the drive is trimmed up, or visible signs of deterioration like surface cracks, delamination, or swelling of the rubber.

How often should I replace the exhaust bellows?
Regular inspection is recommended annually. Replacement is advised every 2-5 years, depending on operating conditions such as saltwater exposure, hours of use, and whether the boat is stored with the stern drive in the up or down position.

What can I do to make the bellows last longer?
Avoid storing the boat with the stern drive in the fully raised position for extended periods, as this puts constant stress on the rubber. Also, ensure your engine's cooling system is properly maintained to prevent overheating, which can accelerate rubber deterioration.

OEM vs. Aftermarket?
This listing is anreplacement 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 anreplacement 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.