807166A3 2.50 in. Exhaust Water Shutter for MerCruiser Stern Drive
807166A3 2.50 in. Exhaust Water Shutter for MerCruiser Stern Drive is backordered and will ship as soon as it is back in stock.
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807166A3 2.50 in. Exhaust Water Shutter for MerCruiser Stern Drive
807166A3 2.50 in. Exhaust Water Shutter for MerCruiser Stern Drive is backordered and will ship as soon as it is back in stock.
SERDAMARINE / MARINE EXHAUST PARTS
Exhaust Water Shutter — 2.50 in. Diameter at Cross Pin
This aftermarket exhaust water shutter for Mercruiser Stern / Out Drive exhaust systems corresponds to Mercury reference 807166A3 and acts as a flexible check valve to stop water from returning up the exhaust system toward the engine. It is specified with a 2.50-inch diameter measured at the cross pin.
Configuration & Specifications
| Diameter at Cross Pin | 2.50 in. |
|---|---|
| Function | Flexible check valve to stop water from returning up the exhaust system to the engine |
Engine Applications
For replacing an exhaust water shutter on Mercruiser Stern / Out Drive exhaust systems. Select the replacement by the original shutter reference and the 2.50-inch dimension measured at the cross-pin location rather than by engine family alone.
- Mercruiser Stern / Out Drive — Exhaust systems requiring a 2.50 in. diameter exhaust water shutter at the cross pin. Fits when specified
Reference Numbers
The numbers below are listed for part identification only and do not by themselves guarantee interchangeability or indicate original manufacturer identity. Keep the complete part-number suffix when comparing replacements, including A1, A2, or A3 where shown.
| Mercury / Mercury Mariner | 807166A3, 807166A 3, 14348, 143481, 14348A1, 14348A2 |
|---|---|
| Sierra | 18-2732, 18-2732-9, 18-2733 |
| Mallory | 9-42802 |
| GLM | 89170 |
| RECMAR | REC807166A3 |
Supplied Parts
- Exhaust water shutter
Service & Installation Notes
General service guidance only. Use the service manual for your exact engine and exhaust configuration.
- Ensure the engine is shut off, completely cool, and secured against accidental starting before opening any part of the exhaust system.
- Remove the worn shutter and inspect the exhaust passage for loose fragments or debris that could restrict exhaust flow.
- Verify the 2.50-inch dimension at the cross-pin location and confirm that the replacement shutter pivots freely without binding once positioned.
- Reassemble the exhaust connections according to the engine service manual. If abnormal exhaust noise, restriction, or leakage occurs during operation, stop the engine and inspect the installation.
Exhaust parts need a configuration match. Serdamarine focuses on marine exhaust manifolds and their related service parts. Application details, connection requirements and public reference numbers are presented together to support part selection.
Questions Before Replacement
How should I identify whether this exhaust water shutter matches my housing?
Measure across the cross-pin location where the shutter mounts; this shutter is built for a 2.50-inch diameter at the cross pin. Also compare the full reference number and suffix (such as A1, A2, or A3) rather than selecting by engine family alone.
What function does this water shutter perform in the exhaust system?
It acts as a flexible check valve inside the exhaust passage to help stop water from returning up the exhaust system toward the engine.
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