Exhaust Bellow – Fits Volvo Penta SX/DP-S/DP-SM & OMC Cobra Stern Drives (Replaces 3850426)

Exhaust Bellow – Fits Volvo Penta SX/DP-S/DP-SM & OMC Cobra Stern Drives (Replaces 3850426)

This high-quality aftermarket exhaust bellow is designed for a precise fit on a wide range of Volvo Penta and OMC Cobra stern drives. It serves as a direct replacement for original parts, connecting the stern drive to the transom assembly to ensure a proper seal for exhaust gases.

Engineered to meet or exceed OEM specifications, this component is manufactured in an ISO9002-certified facility, guaranteeing reliability and performance. It is a crucial part of your vessel's maintenance, preventing water intrusion and ensuring efficient engine operation.

• Direct Replacement: Installs without modification on compatible Volvo Penta and OMC Cobra models.
• Durable Construction: Made from a robust rubber and synthetic compound to withstand the harsh marine environment.
• Versatile Compatibility: Fits various V6 and V8 engine configurations within the specified stern drive series.

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 Applications

OMC Applications

Technical Specifications

Package Contents

Most retailers sell this as a complete bellows assembly. Please verify the contents with your specific retailer before purchase.

• 1 x Exhaust Bellow (AM3850426)
• 2 x O-Ring (AM25-30613)
• 1 x O-Ring (AM3852045)
• 1 x Anode Kit Aluminum (CMSXKITA)
• 1 x Pin (AM3852056)
• 1 x Rubber Seal (AM3852560)
• 1 x Gasket (AM3855081)
• 1 x O-Ring (AM955981)
• 1 x U-Joint Bellow (AM3841481)

Note: Some retailers may sell only the bare exhaust bellow without the additional hardware.

Explosion Diagram

Installation Guide

Professional installation is highly recommended. The following are general guidelines:

1. Safety First: Disconnect the boat's battery before beginning any work.
2. Access the Bellow: Trim the stern drive to the full upward "trailer" position to gain access to the exhaust bellow.
3. Remove Old Bellow: Carefully loosen and remove the clamps securing the old bellow to the transom and the stern drive.
4. Inspect and Clean: Remove the old bellow. Thoroughly clean the mounting surfaces on both the transom housing and the drive, removing any old sealant or debris.
5. Position New Bellow: Place the new exhaust bellow into position, ensuring it is properly seated on both ends.
6. Secure Clamps: Install and tighten the new clamps securely. Ensure they are correctly aligned in their grooves.
7. Final Check: Lower the stern drive and cycle it side-to-side, checking for any binding or kinking of the new bellow.
8. Reconnect Power: Reconnect the battery once installation is complete and verified.

Troubleshooting & FAQ

How do I confirm this bellow fits my specific engine?
First, check the "Compatible Engine Models" tables on this page. Cross-reference your stern drive model (e.g., Volvo Penta SX, OMC Cobra) and engine year. Second, use the "Part Number Cross-Reference" table to see if your existing part number matches any of the listed equivalents.

What are the common signs that my exhaust bellow has failed?
The most common signs of a failed bellow are visible cracks, splits, or perishing of the rubber. You may also notice an unusual amount of exhaust noise or, more critically, water leaking into the boat's bilge area from the transom.

How often should I replace the exhaust bellow?
As a preventative maintenance item, it is recommended to inspect all bellows annually for signs of wear or damage. Replacement is typically advised every 3-5 years, depending on usage (freshwater vs. saltwater) and storage conditions.

Does this listing include clamps and other hardware?
Most retailers sell this part as a comprehensive kit that includes the exhaust bellow and associated hardware like O-rings and clamps. However, it is critical to verify the package contents with your specific retailer, as some may offer only the bellow itself.

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.