Water Exhaust Shutter Kit – Fits MerCruiser 4.3L V6 (Replaces 807166A2)
Water Exhaust Shutter Kit – Fits MerCruiser 4.3L V6 (Replaces 807166A2) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Free standard shipping on all orders under 1 KG
Water Exhaust Shutter Kit – Fits MerCruiser 4.3L V6 (Replaces 80716...
Product Details
This Water Exhaust Shutter Kit – Fits MerCruiser 4.3L V6 Engines (Replaces 807166A2) is designed for MerCruiser 4.3L V6 engines equipped with 1-piece exhaust manifolds. It is engineered to fit Y-pipes that have a specific 2.98-inch cross pin diameter, preventing water from flowing back into the engine.
It serves as a direct replacement for Mercury part number 807166A2 and Quicksilver 807166A2.
- Installation Location: Y-Pipe (Bullhorn)
- Fitment Specificity: Requires a 2.98 inch cross pin diameter
- Intended System: For use with 1-piece manifold exhaust systems
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 807166A2 |
| Quicksilver | 807166A2 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For MerCruiser applications, this part is specifically intended for the V6 models listed that use a 1-piece exhaust manifold.
| Brand | Model | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|
| MerCruiser | 4.3L | 4-Stroke | 807166A2 | For V6 engines with 1-piece manifolds only |
| MerCruiser | 262 MAG | 4-Stroke | 807166A2 | Various models |
Technical Specs
- Product Type
- Exhaust Water Shutter Kit
- Installation
- Y-Pipe (Bullhorn)
- Fitting Type
- 2.98 inch cross pin diameter
- Housing Material
- Rubber/Composite
- Other Technical Attributes
- Used with 1-piece manifold exhaust system
What’s in the Box
- 1 x Exhaust Water Shutter (807166A2)
- 2 x Grommets (807167/8M0204688)
Installation Notes
- Ensure the engine is off and cool, and disconnect the battery for safety.
- Access the exhaust Y-pipe where the shutter is located. This may require removing the exhaust elbow or riser.
- Carefully remove the old, potentially brittle shutter and grommets from the Y-pipe housing.
- Thoroughly clean the mounting surfaces and grommet holes inside the Y-pipe.
- Press the two new grommets into their designated holes in the Y-pipe housing.
- Insert the new water shutter, ensuring its cross pin seats securely and evenly within the new grommets.
- Reassemble the exhaust components, start the engine, and check for any exhaust or water leaks.
Troubleshooting & FAQ
How do I know if this shutter fits my engine?
This shutter is specifically for MerCruiser 4.3L V6 engines with 1-piece exhaust manifolds. Critically, your Y-pipe must have a 2.98-inch cross pin diameter for a proper fit. Always compare the part to your old one before installation.
What are the signs of a failing exhaust water shutter?
Common symptoms include the engine overheating at idle, an unusual gurgling or thumping sound from the exhaust, or—in severe cases—water ingestion back into the engine, which can cause catastrophic damage.
How often should the exhaust water shutter be replaced?
There is no fixed replacement interval. It is best practice to inspect the shutter annually or any time the exhaust system is serviced. As a wear item made of rubber and composite, it can become brittle or break over time, particularly in saltwater environments.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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