Exhaust Bellows – Fits OMC Cobra & Volvo Penta SX (Replaces 3850426, 875848)

Exhaust Bellows – Fits OMC Cobra & Volvo Penta SX (Replaces 3850426, 875848)

This exhaust bellows is a direct replacement for OMC Cobra sterndrives and select Volvo Penta SX and DP drives. It is designed to connect the exhaust system, preventing water from entering the engine compartment while allowing exhaust gases to exit through the sterndrive.

It directly replaces OEM and aftermarket part numbers, including OMC 3850426 and 914036, Volvo Penta 875848, GLM 89190, and Sierra 18-2768, ensuring a precise fit for the specified engine models.

• Engineered as a direct replacement for straightforward installation.
• Constructed from high-grade, durable rubber/neoprene to withstand the marine environment.
• Note: This bellows does not include the internal flapper valves.

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 Exhaust Bellows (Replaces 3850426/875848)

Installation Guide

1. Safety First: Ensure the engine is completely off, cool, and the battery is disconnected.
2. Access the Bellows: Depending on your boat, you may need to trim the sterndrive up to gain full access to the exhaust bellows.
3. Remove Old Clamps: Loosen and remove the hose clamps securing the old bellows at both ends. These may be corroded and require force.
4. Detach Old Bellows: Carefully pry or pull the old bellows off its mounting points on the transom assembly and the sterndrive.
5. Clean Surfaces: Thoroughly clean the connection surfaces where the new bellows will mount. Remove any old sealant, rubber residue, or corrosion.
6. Position New Bellows: Align the new exhaust bellows, ensuring it is correctly seated on both connection points.
7. Secure New Clamps: Install and tighten the new hose clamps. Ensure they are snug to create a watertight seal but avoid over-tightening, which can damage the rubber.
8. Final Check: Lower the drive and inspect the installation. Once the boat is in the water, check for any signs of leaks around the bellows area.

Troubleshooting & FAQ

How do I confirm this fits my engine?
This bellows fits a wide range of OMC Cobra V4, V6, and V8 engines from 1986–1993, as well as Volvo Penta AQ series engines with SX and DP drives from 1994 to present. The best way to confirm fitment is to match your existing part number to one of the cross-reference numbers, such as OMC 3850426 or Volvo Penta 875848.

Does this part include the internal flapper valve?
No, this exhaust bellows does not come with flapper valves. Flapper valves are crucial for preventing water from flowing back into the engine. You will need to reuse your existing flappers if they are in good condition or purchase them separately.

What are the signs my exhaust bellows needs replacing?
Common signs of a failing exhaust bellows include visible cracks, splits, or perishing rubber from age and exposure. You might also notice water leaking into the bilge area, or hear changes in the exhaust sound at the stern of the boat.

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.