807166A3 Exhaust Flappers Water Shutters Y Pipe For MerCruiser 1982 1996

Product Overview

This exhaust flapper water shutter assembly is designed to prevent water backflow into the engine exhaust system on MerCruiser stern drive engines from 1982 to 1996. It replaces worn or damaged flappers in the Y-pipe to maintain proper exhaust flow and protect the engine from hydro-lock. Marine mechanics and boat owners rely on this part for reliable cooling system performance.

Key Features & Performance

• Direct replacement for OEM part 807166A3
• Constructed with heat-resistant materials for long service life
• Prevents exhaust water reversion at idle and low speeds
• Engineered to fit MerCruiser Y-pipe assemblies from 1982-1996
• Includes flapper and shutter components for complete installation

Fitment & Compatibility

• Fits MerCruiser stern drive engines 1982-1996
• Compatible with most GM-based MerCruiser V6 and V8 models
• Replaces OEM Y-pipe exhaust flapper on many Alpha, Bravo, and TR drives

Common Uses

• Replacing failed exhaust flappers in MerCruiser Y-pipe systems
• Preventing water intrusion during engine shut-down or low RPM operation
• Restoring proper exhaust backpressure for older MerCruiser engines
• Maintenance on freshwater and saltwater boats with MerCruiser power

Technical Specifications

• Part Number(s): 807166A3
• Material: Stainless steel and high-temperature rubber/elastomer
• Flapper Diameter: Approximately 3.5 inches (verify fitment)

Frequently Asked Questions

Q: Will this fit my 1990 MerCruiser 5.7L? A: Yes, this flapper is designed for 1982-1996 MerCruiser engines including the 5.7L (350) – verify your Y-pipe style before purchase.

Q: What material is the flapper made of? A: The flapper uses a stainless steel backing plate with a flexible EPDM rubber seal for heat and chemical resistance.

Product appearance and specifications may vary slightly by batch. Compatibility may vary by serial number. Verify fitment before purchase.