Mercury – Quicksilver Exhaust Water Shutter Kit | For Select MerCruiser Sterndrive Engines | 807166A2

Overview

When your boat’s sitting still or idling in rough water, the last thing you want is seawater creeping back into your engine. The Mercury Marine 807166A2 Quicksilver Exhaust Water Shutter Kit stops that from happening. Designed for MerCruiser sterndrives with Y-pipes measuring 2.98 inches at the cross pin, this kit acts as a one-way valve — letting exhaust exit freely while blocking water from coming back in. It’s a small part that plays a big role in keeping your engine protected and ready for another season on the water.

Key Features

• Purpose: Prevents water from backing up into the exhaust system and reaching the engine.
• Design: Built for MerCruiser sterndrive Y-pipes with a 2.98-inch cross pin diameter.
• Performance: Functions as a check valve — opens for exhaust flow, closes against backwash.
• Durability: Made from heat- and salt-resistant materials that handle high exhaust temps.
• Ease of Use: Simple to install using standard hand tools.

Engine & Boat Compatibility

• MerCruiser sterndrive engines
• Y-pipes with 2.98-inch diameter at the hinge pin (check your service manual for fitment)

Performance & Real-World Benefits

The 807166A2 exhaust water shutter is one of those unseen components that quietly does critical work. When your boat slows down, stops, or gets hit by following seas, this shutter closes automatically, preventing backwash from entering the exhaust and damaging your engine. Without it, water can flood into the cylinders, causing rust, hydro-locking, or worse.

Built with heavy-duty materials that resist heat, corrosion, and vibration, this OEM shutter stands up to years of service. It installs easily and provides peace of mind every time you head out — because you’ll know your engine’s protected, even when the water gets rough.

Why Choose Mercury OEM

The Quicksilver 807166A2 is a genuine Mercury Marine part, designed specifically for MerCruiser exhaust systems. Aftermarket versions can have poor tolerances or materials that degrade quickly in heat and saltwater, leading to leaks or failure.

Mercury OEM shutters are built and tested under real marine conditions, ensuring reliable performance and perfect fit. It’s the same part Mercury uses on new sterndrives — trusted by technicians and boat builders alike.

FAQ

Q1: What does this kit do?
It prevents water from flowing back through the exhaust into the engine when idling or shut off.

Q2: What drives does it fit?
It fits MerCruiser sterndrives with 2.98-inch Y-pipe cross pin diameters.

Q3: When should it be replaced?
Replace it if it’s cracked, warped, or missing — or during major exhaust maintenance.

Q4: Can I install it myself?
Yes — it’s a straightforward installation that only needs basic tools.

Q5: Why use Mercury OEM?
Because Mercury OEM parts are made for exact fit and long-term reliability under real boating conditions.