4-Inch Exhaust Y-Pipe Bellows and Water Shutter Kit for MerCruiser Stern Drives

Product Details

This 4-Inch Exhaust Y-Pipe Bellows and Water Shutter Kit is intended for MerCruiser stern-drive exhaust systems using 4-inch connections. It combines the upper and lower exhaust bellows with 4-inch water shutters for service of the exhaust Y-pipe assembly.

The lower bellows connect the 4-inch elbow to the 4-inch Y-pipe, while the upper bellows connect a 4-inch center-mounted riser to the 4-inch elbow. The water shutters are installed in the exhaust path to help limit water backflow toward the engine when the engine is stopped or operating at low speed.

• 4-inch lower exhaust bellows for elbow-to-Y-pipe connection.
• 4-inch upper exhaust bellows for center-mounted riser-to-elbow connection.
• Two 4-inch water shutters for the exhaust assembly.
• Designed as an exhaust Y-pipe service kit for compatible MerCruiser stern-drive applications.

Component Reference Matrix

The following manufacturer reference numbers identify the components supplied in this kit. Confirm the connection size and exhaust layout before ordering.

Compatibility Information

This kit is associated with MerCruiser stern-drive exhaust systems using the component references listed above. Catalog information identifies the upper 4-inch bellows reference for V6 and V8 applications and identifies the water shutter reference as a 4-inch component. Because exhaust manifolds, risers, elbows, and Y-pipes can vary by engine configuration and serial range, verify the existing component numbers, connection diameter, and exhaust routing before installation.

This listing does not confirm every MerCruiser model, year, horsepower rating, or serial-number range. Do not use the component references alone to establish fitment for an engine with a different exhaust layout or connection size.

Technical Specifications

Product Type

Exhaust Y-pipe bellows and water shutter kit

Application

MerCruiser stern-drive exhaust systems

Connection Size

4 inches (approximately 101.6 mm)

Lower Bellows Position

4-inch elbow to 4-inch Y-pipe

Upper Bellows Position

4-inch center-mounted riser to 4-inch elbow

Water Shutter Size

4 inches

Water Shutter Function

Helps limit exhaust-system water backflow toward the engine

What’s in the Box

• 2 x Lower 4-inch exhaust bellows, reference 32-14358T
• 2 x Upper 4-inch exhaust bellows, reference 32-44348T
• 2 x 4-inch exhaust water shutters, reference 807166A1

Clamps and other installation hardware are not identified. Reuse only hardware that is in suitable condition and matches the installation requirements.

Installation Notes

1. Disconnect the battery and allow the engine and exhaust system to cool before beginning work.
2. Confirm that the existing exhaust system uses 4-inch connections and compare the removed components with the references listed above.
3. Gain access to the exhaust Y-pipe, riser, elbow, and bellows connections according to the engine and sterndrive service procedure.
4. Remove the existing upper and lower bellows and inspect the Y-pipe, elbow, riser, and sealing surfaces for corrosion, damage, or debris.
5. Install the water shutters in the correct exhaust orientation so they can open with exhaust flow and close against reverse water movement.
6. Install the lower bellows between the 4-inch elbow and Y-pipe, then install the upper bellows between the center-mounted riser and 4-inch elbow.
7. Secure each connection with suitable clamps or specified installation hardware. Tighten according to the applicable service instructions.
8. After reassembly, run the engine in a safe environment and check for exhaust leaks, cooling-water leaks, abnormal noise, or displaced components.

Maintenance and Troubleshooting

Safety & Important Information

• Verify the connection size, exhaust layout, and existing component references before purchase.
• Do not rely on engine displacement, horsepower, or model family alone to determine fitment.
• Work only on a cool, fully secured engine and follow the applicable service procedures.
• Professional installation is recommended when access to the Y-pipe or sterndrive exhaust assembly requires major disassembly.

About Sea Sierra

• Marine Replacement Components — Parts and kits for common marine exhaust and sterndrive service requirements.
• Application-Focused Listings — Component references and connection details are provided to support fitment checks.
• Service Support — Compare the supplied references with the parts removed from your engine before installation.