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Exhaust Water Shutter Flapper for Mercruiser V6 V8 807166A1 92798 Sierra 18-2732
Exhaust Water Shutter Flapper for Mercruiser V6 V8 807166A1 92798 Sierra 18-2732
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Mercruiser Exhaust Water Shutter 92798
Premium Quality Aftermarket Replacement Part
Protect your engine from catastrophic water ingestion with this high-grade exhaust water shutter (flapper). This part is a critical safety component located within the exhaust Y-pipe, acting as a one-way check valve to prevent water from surging back into the exhaust manifolds and engine cylinders when decelerating or stopping.
Key Features
- ✔ Direct fit for 4-inch Y-pipes
- ✔ Prevents water backflow (Hydro-lock protection)
- ✔ Includes 2 essential retainer grommets
- ✔ High-temp marine-grade construction
Technical Specs
| Application: | Exhaust Y-Pipe |
| Pipe Diameter: | 4 Inch (Oval/Round) |
| Material: | Stainless Steel / Rubber |
| Configuration: | Pin Style Mounting |
Compatibility / Fitment Guide
| Engine Series | Typical Years | Notes |
|---|---|---|
| Mercruiser 4.3L V6 | 1982 - 1996+ | Fits 4" Y-pipes with round pin holes |
| Mercruiser 5.0L / 5.7L V8 | 1982 - 1996+ | Fits 305/350 CID applications |
| Mercruiser 7.4L / 8.2L V8 | 1982 - 1996+ | Fits Big Block 454/502 applications |
OEM Cross Reference
| Mercruiser / Quicksilver: | 807166A1, 92798, 92798A1, 14348A1, 14348A2 |
| Sierra Marine: | 18-2732, 18-2732-9 |
| Mallory: | 9-42802 |
| GLM: | 89170 |
Questions & Answers
Is this a genuine original part?
This is a premium quality aftermarket replacement part, manufactured to meet or exceed original equipment (OE) standards for fitment and performance in marine environments.
How many shutters do I need?
Most V6 and V8 Mercruiser engines with a Y-pipe require two shutters (one for each side of the exhaust system). It is highly recommended to replace both at the same time.
Why did my old shutter melt?
Water shutters typically fail or melt due to an engine overheat or a failure in the raw water cooling system. If your shutters are damaged, you should also inspect your water pump impeller and exhaust risers for restriction.
Note: Please verify your original part number and pipe diameter before purchasing. 4boats.co.uk provides high-quality replacement components for marine professionals and boat owners.
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