Exhaust Bellow – Fits Volvo Penta & OMC Cobra 2.3L-8.1L V4/V6/V8 Engines (Replaces 3863450, 3852741)

Exhaust Bellow – Fits Volvo Penta & OMC Cobra 2.3L-8.1L V4/V6/V8 Engines

This OEM-quality exhaust bellow is designed for direct replacement on Volvo Penta and OMC Cobra sterndrive units. It is manufactured from durable, marine-grade rubber to ensure a reliable, leak-free seal and long service life in harsh marine environments.

This component is compatible with a wide range of Volvo Penta 2.3L–8.1L engines (1986–1991) and OMC Cobra 2.3L–5.8L engines (1987–1991), serving as a direct replacement for multiple original part numbers.

• Installation Type: Direct OEM-Style Replacement
• Material: High-Grade Marine Rubber
• Manufacturing Standard: Produced in an ISO9002 certified facility

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.

Volvo Penta

OMC Cobra

Technical Specifications

Package Contents

• 1 x Exhaust Bellow (Replaces 3863450/3852741)

Installation Guide

1. Safety First: Disconnect the boat's battery before beginning work.
2. Access the Drive Unit: Trim the sterndrive to the full "up" or "trailer" position for better access.
3. Remove Old Clamps: Locate the old exhaust bellow and loosen or cut the hose clamps at both ends.
4. Remove Old Bellow: Carefully pry the old bellow off the transom and the drive unit. This may require some force if it has aged and hardened.
5. Clean Mating Surfaces: Thoroughly clean the mounting surfaces on both the transom and drive unit. Remove all old adhesive, rubber residue, and corrosion.
6. Position New Bellow: Apply a suitable marine-grade adhesive to the mounting surfaces if recommended for your model.
7. Install and Secure: Slide the new bellow into place and secure it with new, high-quality stainless steel hose clamps.
8. Check Alignment: Ensure the bellow is not twisted or kinked.
9. Tighten Clamps: Tighten the clamps securely to create a watertight seal. Do not overtighten, which could damage the bellow.
10. Final Check: Lower the drive unit, reconnect the battery, and start the engine. Check carefully for any signs of exhaust or water leaks around the new bellow.

Troubleshooting & FAQ

How do I confirm this bellow fits my specific engine?
Verify your engine brand, model, and year against the compatibility tables above. It is also critical to cross-reference the OEM part number (e.g., 3863450 for Volvo Penta, 3852741 for OMC) listed for your engine to ensure a correct match.

What are the signs that my exhaust bellow needs replacing?
Common signs of a failing exhaust bellow include visible cracks, splits, or perishing of the rubber, water leaking into the bilge area from the transom assembly, or an unusually loud or different-sounding exhaust noise.

How often should I replace the exhaust bellow?
Exhaust bellows should be inspected annually as part of regular sterndrive maintenance. We recommend replacement every 3-5 years, or immediately if any signs of wear or damage are found. Usage in saltwater environments may require more frequent replacement.

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.