Water Exhaust Shutter Kit – Fits MerCruiser 4.3L V6 Engines (Replaces 807166A2)

Water Exhaust Shutter Kit – Fits MerCruiser 4.3L V6 Engines (Replaces 807166A2)

This aftermarket water exhaust shutter kit is engineered for MerCruiser 4.3L V6 engines equipped with 1-piece exhaust manifolds. It is specifically designed to fit Y-pipes (bullhorns) that feature a 2.98-inch cross pin diameter, ensuring a precise and reliable seal.

It serves as a direct replacement for Mercury part number 807166A2 and Quicksilver part number 807166A2, restoring proper function to your exhaust system.

• Engineered for Y-Pipe (Bullhorn) installation in systems with 1-piece exhaust manifolds.
• Made from durable rubber/composite materials to withstand the marine environment.
• Kit includes one shutter and two installation grommets for a complete replacement.

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 Water Shutter (Replaces 807166A2)
• 2 x Grommets (Replaces 807167, superseded by 8M0204688)

Installation Guide

1. Ensure the engine is off, cool to the touch, and the battery is disconnected for safety.
2. Locate the exhaust Y-pipe, typically situated at the rear of the engine assembly.
3. Carefully remove the old, failed water shutter and its associated grommets from the Y-pipe.
4. Thoroughly clean the mounting surfaces inside the Y-pipe to remove any debris or residue.
5. Press the two new grommets firmly into their designated holes within the Y-pipe.
6. Align the new water shutter and press its cross pin securely into the grommets until it is properly seated.
7. Manually check that the shutter flap can move freely without binding.
8. Reconnect the battery, start the engine, and inspect for any exhaust or water leaks around the newly installed part.

Troubleshooting & FAQ

Q: How do I know if this water shutter will fit my MerCruiser 4.3L engine?
A: This shutter is specifically for MerCruiser 4.3L V6 engines that use a 1-piece exhaust manifold. Crucially, your Y-pipe must have a cross pin diameter of 2.98 inches for this part to fit. Please verify these details on your engine before ordering.

Q: What are the signs that my old water shutter needs replacing?
A: Common signs of a failed water shutter include an engine that is difficult to start, water ingestion into the cylinders (hydrolock), or visible damage like cracks or missing flaps on the old shutter.

Q: What is the purpose of the water shutter?
A: The exhaust water shutter is a critical component that prevents water from flowing back up the exhaust system and entering the engine when the engine is off or at low RPMs, which could cause severe damage.

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.