MerCruiser 4-Inch Exhaust Y-Pipe Service Kit – 2 Upper Bellows, 2 Lower Bellows & 2 Water Shutters

Product Details

This 4-inch Exhaust Y-Pipe Service Kit is assembled for MerCruiser stern-drive and outdrive exhaust systems. It includes the upper and lower exhaust bellows needed for service work, together with water shutters that help limit water reversion through the exhaust path when the engine is idling, decelerating, or stopped.

The kit is configured around the MerCruiser exhaust components identified as 32-44348T for the upper bellows, 32-14358T for the lower bellows, and 807166A3 for the water shutters. Catalog references identify the bellows as 4-inch components and associate the shutter reference with MerCruiser V6 and V8 applications, including 1992–1995 applications. Always compare the existing bellows, Y-pipe design, exhaust diameter, and shutter arrangement before ordering.

• Service kit for a 4-inch MerCruiser exhaust Y-pipe system.
• Supplies two upper exhaust bellows and two lower exhaust bellows.
• Includes two water shutters for the exhaust assemblies.
• Water shutters act as flexible check valves to help reduce water traveling back toward the engine.
• Suitable for repair or replacement of worn, cracked, or deteriorated exhaust bellows and shutters.

Part Number References

The following references identify the components included in this kit. They are provided for comparison and are not a statement that every number is interchangeable in every application.

Compatibility Guidance

This kit is intended for MerCruiser stern-drive and outdrive applications using a 4-inch exhaust Y-pipe system. Supplementary catalog information identifies the 32-14358T lower bellows and 32-44348T upper bellows as 4-inch components and lists the 807166A3 water shutter for V6 and V8 applications, including 1992–1995 configurations.

Compatibility depends on the complete exhaust configuration, not only on engine displacement. Confirm all of the following before installation:

• MerCruiser stern-drive or outdrive exhaust arrangement.
• 4-inch exhaust diameter.
• Upper and lower bellows shape and connection points.
• Existing water-shutter reference and Y-pipe design.
• Engine year, model, manifold/riser arrangement, and serial-number details where applicable.

Do not assume fitment for a different exhaust diameter, a different Y-pipe design, or a configuration using another shutter style. Compare the original parts and installation location before purchase.

Technical Specifications

Product Type

Exhaust Y-pipe service kit

Application

MerCruiser stern-drive and outdrive exhaust systems

Exhaust Size

4 inches

Upper Bellows

2 x 32-44348T reference bellows

Lower Bellows

2 x 32-14358T reference bellows

Water Shutters

2 x 807166A3 reference shutters

Function

Provides exhaust-bellows service parts and water-shutter protection for the Y-pipe exhaust path

What's in the Box

• 2 x upper exhaust bellows, reference 32-44348T
• 2 x lower exhaust bellows, reference 32-14358T
• 2 x water shutters, reference 807166A3

Clamps, fasteners, gaskets, adhesive, and other installation hardware are not listed as included components. Reuse existing hardware only if it is serviceable and appropriate for the application.

Installation Notes

Installation requires access to the exhaust Y-pipe and bellows connections. Remove the old bellows and shutters, clean and inspect the mating surfaces, and compare every replacement component with the original before fitting. Install the upper and lower bellows in their correct positions and secure all connections according to the engine or sterndrive service procedure.

Water shutters are installed within the exhaust Y-pipe or associated exhaust assembly. Their purpose is to allow exhaust flow while helping prevent water from traveling back through the exhaust system toward the engine. Because exhaust components can be difficult to access and incorrect installation can cause leaks or water-ingestion damage, professional installation is recommended.

Maintenance and Inspection

• Inspect bellows regularly for cracking, splitting, hardening, swelling, or loose connections.
• Check the water shutters for tears, distortion, looseness, or restricted movement.
• Replace damaged clamps, gaskets, or fasteners rather than installing them in an unserviceable condition.
• After installation, inspect for exhaust leaks and confirm that the bellows remain correctly seated.
• Follow the manufacturer's service procedure for the specific engine and sterndrive configuration.

Troubleshooting & FAQ

Safety & Important Information

• Verify the 4-inch exhaust size and compare the original bellows and shutters before ordering.
• Keep the engine model, year, serial-number range, exhaust design, and component references together when confirming fitment.
• Do not operate the engine with damaged, incorrectly seated, or leaking exhaust bellows.
• Professional installation is recommended because exhaust and water-shutter service may affect engine protection and exhaust sealing.

About Sea Sierra

• Marine Replacement Parts — Practical service components for sterndrive and inboard marine systems.
• Application-Focused Listings — Component references and installation guidance are provided to support careful fitment checks.
• Service-Ready Kits — Bundled parts help simplify common exhaust maintenance and replacement work.