3852696;18-2779 Upper & Lower Exhaust Hose Bellows for Volvo Penta OMC | JLM Marine

Upper & Lower Exhaust Hose Bellows – Fits Volvo Penta & OMC V6/V8 Engines

This upper and lower exhaust hose bellows set is engineered for Volvo Penta and OMC V6 and V8 engines, including 4.3L, 5.0L, and 5.7L models. Manufactured to OEM specifications, these rubber exhaust couplers provide reliable sealing and flexibility in demanding marine environments.

Direct Replacements: Upper bellows replaces 3852696, 9-72802, 913405, 89224, 18-2779. Lower bellows replaces 3863450, 3852741, 0778067, 18-27801, 18-2780-1.

• Includes both upper and lower exhaust couplers with 4 stainless steel clamps
• OEM-quality construction for lasting durability
• Direct bolt-on replacement for original equipment

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 × Upper rubber exhaust coupler (bellows)
• 1 × Lower rubber exhaust coupler (bellows)
• 4 × Stainless steel hose clamps

Installation Guide

1. Preparation: Disconnect the battery and allow the engine to cool completely. Gather all necessary tools including screwdrivers, wrenches, and new clamps.
2. Access: Remove engine covers and any components obstructing access to the exhaust manifold and elbow assembly.
3. Remove old bellows: Loosen and remove the old hose clamps on both upper and lower exhaust hoses. Carefully slide off the old bellows from both the manifold and elbow connections.
4. Clean surfaces: Thoroughly clean the manifold nipple and exhaust elbow surfaces to remove carbon deposits and old gasket material. Ensure all mating surfaces are dry and smooth.
5. Install lower bellows: Slide the lower exhaust bellows onto the manifold outlet first, then position it onto the elbow inlet. Ensure proper alignment before securing.
6. Secure lower bellows: Install the provided clamps and tighten evenly to manufacturer specifications. Do not overtighten as this may damage the rubber.
7. Install upper bellows: Position the upper exhaust bellows between the exhaust manifold and riser/elbow connection points. Check that the bellows is seated fully on both ends.
8. Secure upper bellows: Install and tighten the clamps on both ends of the upper bellows, ensuring a secure seal without over-compression.
9. Inspect installation: Verify that all connections are tight and properly aligned. Check that no kinks or twists exist in either bellows.
10. Reassemble: Reinstall any components removed during disassembly and reconnect the battery.
11. Test run: Start the engine and check for exhaust leaks at all connection points. Run the engine at idle and then at higher RPMs to verify proper sealing.
12. Final check: After the first run, re-inspect all clamps and connections while the engine is cool, and re-tighten if necessary.

Troubleshooting & FAQ

Q: How do I confirm this bellows set fits my engine?
A: Verify your engine is a Volvo Penta or OMC V6 or V8 (including 4.3L, 5.0L, or 5.7L models). Cross-reference your current part numbers with those listed in the Part Number Cross-Reference table above to ensure compatibility.

Q: What are signs that my exhaust bellows need replacement?
A: Common indicators include visible cracks or deterioration in the rubber, exhaust leaks at the connections, water intrusion into the bilge, or a strong exhaust smell in the engine compartment. Replace immediately if any damage is detected to prevent carbon monoxide risks.

Q: How often should I replace exhaust bellows?
A: Inspect exhaust bellows annually as part of routine maintenance. Replacement is typically recommended every 3-5 years depending on usage and operating conditions, or sooner if cracking, hardening, or leaks are observed.

Q: Can I install these bellows myself?
A: Yes, if you have mechanical experience and the proper tools. Ensure you can safely access the exhaust system and follow all installation steps carefully. However, professional installation is recommended to ensure proper sealing and safety.

Q: Why are there two different bellows in this kit?
A: The upper and lower exhaust bellows have different dimensions and functions within the exhaust routing system. Both are necessary for complete exhaust system integrity on these engine models.

Q: OEM vs. Aftermarket?
A: 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.

Q: How fast do you ship and how much does it cost?
A: 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.

Q: What is your warranty and return policy?
A: 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.