Water Exhaust Shutter Kit – Fits MerCruiser 4.3L V6 Engines (Replaces 807166A2)
This aftermarket water exhaust shutter kit is engineered for MerCruiser 4.3L V6 engines equipped with 1-piece exhaust manifolds. It is specifically designed to fit Y-pipes (bullhorns) that feature a 2.98-inch cross pin diameter, ensuring a precise and reliable seal.
It serves as a direct replacement for Mercury part number 807166A2 and Quicksilver part number 807166A2, restoring proper function to your exhaust system.
- Engineered for Y-Pipe (Bullhorn) installation in systems with 1-piece exhaust manifolds.
- Made from durable rubber/composite materials to withstand the marine environment.
- Kit includes one shutter and two installation grommets for a complete replacement.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
Brand |
Part Number |
Superseded By |
Mercury |
807166A2 |
|
Quicksilver |
807166A2 |
|
JLM Marine (Grommet) |
807167 |
8M0204688 |
Compatible Engine Models
Confirm your engine model/year in the table below.
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 Specifications
Specification |
Value |
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 |
Package Contents
- 1 x Exhaust Water Shutter (Replaces 807166A2)
- 2 x Grommets (Replaces 807167, superseded by 8M0204688)
Installation Guide
- Ensure the engine is off, cool to the touch, and the battery is disconnected for safety.
- Locate the exhaust Y-pipe, typically situated at the rear of the engine assembly.
- Carefully remove the old, failed water shutter and its associated grommets from the Y-pipe.
- Thoroughly clean the mounting surfaces inside the Y-pipe to remove any debris or residue.
- Press the two new grommets firmly into their designated holes within the Y-pipe.
- Align the new water shutter and press its cross pin securely into the grommets until it is properly seated.
- Manually check that the shutter flap can move freely without binding.
- Reconnect the battery, start the engine, and inspect for any exhaust or water leaks around the newly installed part.
Troubleshooting & FAQ
Q: How do I know if this water shutter will fit my MerCruiser 4.3L engine?
A: This shutter is specifically for MerCruiser 4.3L V6 engines that use a 1-piece exhaust manifold. Crucially, your Y-pipe must have a cross pin diameter of 2.98 inches for this part to fit. Please verify these details on your engine before ordering.
Q: What are the signs that my old water shutter needs replacing?
A: Common signs of a failed water shutter include an engine that is difficult to start, water ingestion into the cylinders (hydrolock), or visible damage like cracks or missing flaps on the old shutter.
Q: What is the purpose of the water shutter?
A: The exhaust water shutter is a critical component that prevents water from flowing back up the exhaust system and entering the engine when the engine is off or at low RPMs, which could cause severe damage.
Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.
Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.
Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.
Important Notes
- Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
- This product is an aftermarket replacement part and is not an OEM component.
- Professional installation is recommended to ensure safety and optimal performance.
Why Choose JLM MARINE?
-
Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
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Fast Global Shipping: Free delivery worldwide in 5–15 days.
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Direct from Manufacturer: Competitive pricing without compromising quality.