Exhaust Flap / Non-Return Valve – Fits Volvo Penta 290, SP and DP Series (Replaces 852644)

Exhaust Flap / Non-Return Valve – Fits Volvo Penta 290, SP and DP Series (Replaces 852644)

This exhaust flap non-return valve is designed for a precise fit on a range of Volvo Penta sterndrive models, including the 290, 290DP, SP-A through SP-E, and DP-A through DP-C series. It serves as a direct replacement, preventing water from flowing back into the engine's exhaust system.

This component is a direct replacement for Volvo Penta part number 852644 and is also cross-compatible with Repower Marine RM852644 and HSR Marine 911-082.

• Installation Method: Direct push-on fit to the exhaust system.
• Primary Function: Acts as a non-return valve to prevent water backflow.
• Included Parts: Includes one exhaust flap.

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 Flap / Non-Return Valve (Replaces 852644)

Installation Guide

1. Safety First: Ensure the engine is completely turned off and has had ample time to cool down.
2. Locate the Valve: Access the sterndrive's exhaust outlet to locate the old exhaust flap.
3. Remove Old Flap: Carefully pry off or pull out the existing flap. It may be brittle, so take care not to let pieces fall into the exhaust housing.
4. Clean the Surface: Thoroughly clean the mounting area inside the exhaust housing, removing any debris, corrosion, or old material.
5. Install New Flap: Firmly push the new exhaust flap into position until it is seated correctly and securely.
6. Final Check: Manually move the flap to ensure it swings freely and returns to its closed position.

Troubleshooting & FAQ

Q: How do I confirm this flap fits my sterndrive?
A: This part is compatible with Volvo Penta 290, 290DP, SP-A through SP-E, and DP-A through DP-C models. The most reliable method is to match the OEM part number 852644 with your existing part or service manual.

Q: What is the purpose of this exhaust flap?
A: It functions as a crucial non-return valve. Its primary job is to prevent water from surging back into the engine's exhaust system, especially when the boat is stationary in the water or decelerating quickly.

Q: What are the signs that my old exhaust flap needs replacing?
A: Signs of failure include visible cracks, stiffness, or brittleness in the material. If the flap is stuck open, it can allow water into the engine, while a flap stuck closed can restrict exhaust flow and harm performance. Regular visual inspection is recommended.

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.