Water Exhaust Shutter Kit – Fits MerCruiser 4.3L V6 (Replaces Mercury/Mercruiser 807166A2, Quicksilver 807166A2)
Water Exhaust Shutter Kit – Fits MerCruiser 4.3L V6 (Replaces Mercury/Mercruiser 807166A2, Quicksilver 807166A2) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Water Exhaust Shutter Kit – Fits MerCruiser 4.3L V6 (Replaces Mercu...
Product Details
This aftermarket Water Exhaust Shutter Kit – Fits MerCruiser 4.3L V6 Engines (Replaces 807166A2) is engineered to prevent water from entering the engine through the exhaust system. It is specifically designed for MerCruiser 4.3L V6 engines equipped with 1-piece exhaust manifolds and fits Y-pipes (bullhorns) that have a 2.98-inch cross pin diameter.
This kit serves as a direct replacement for Mercury/Mercruiser part number 807166A2 and Quicksilver 807166A2.
- Installs in the Y-pipe (bullhorn) assembly.
- Constructed from durable rubber/composite materials.
- Includes essential grommets for a complete installation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury/Mercruiser | 807166A2 |
| Quicksilver | 807166A2 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For MerCruiser models, verify compatibility using your engine’s serial number, as year ranges are often defined by these ranges.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| MerCruiser | 262 MAG (TBI)(GEN+) | 4-Stroke | [0F803800 THRU 0K999999] | 807166A2 | |
| MerCruiser | 4.3L (GEN+) (2 BBL.) GM 262 V-6 | 4-Stroke | 1998 [0L010044 THRU 0M614999] | 807166A2 | |
| MerCruiser | 4.3L EFI (GEN+) TBI GM 262 V-6 | 4-Stroke | [0L012009 THRU 0L618999] | 807166A2 | |
| MerCruiser | 4.3L EFI (GEN+) TBI GM 262 V-6 | 4-Stroke | [0L619000 THRU 0M322780] | 807166A2 | |
| MerCruiser | 4.3LH (GEN+) (4 BBL.) GM 262 V-6 | 4-Stroke | 1998 [0L010044 THRU 0M614999] | 807166A2 | |
| MerCruiser | 4.3LX (GEN+) (2 BBL.) GM 262 V-6 | 4-Stroke | 1996–1997 [0F803000 THRU 0K999999] | 807166A2 | |
| MerCruiser | 4.3LXH (GEN+) (4 BBL.) GM 262 V-6 | 4-Stroke | 1996–1997 [0F803114 THRU 0K999999] | 807166A2 |
Technical Specs
- Product Type
- Exhaust Water Shutter Kit
- Installation
- Y-Pipe (Bullhorn)
- Housing Material
- Rubber/Composite
- Dimensions
- 15.7 × 7.7 × 0.4 cm (6.18 × 3.03 × 0.16 in)
- Fitting Type
- 2.98 inch cross pin diameter
- Other Technical Attributes
- Used with 1-piece manifold exhaust system
What’s in the Box
- 1 x Exhaust Water Shutter (807166A2)
- 4 x Grommets (807167)
Installation Notes
- Ensure the engine is completely cool and the battery is disconnected.
- Gain access to the exhaust Y-pipe assembly where it connects to the transom.
- Carefully remove the exhaust bellows or hoses connected to the Y-pipe to expose the old shutter.
- Remove the old shutter and its grommets. Clean any debris or corrosion from the housing.
- Install the new grommets and then press the new water shutter into place, ensuring it is correctly oriented.
- Reconnect the exhaust hoses and secure all clamps tightly.
- Reconnect the battery and test the engine at idle, checking for exhaust or water leaks.
Troubleshooting & FAQ
How do I know if this shutter fits my MerCruiser 4.3L engine?
This shutter is designed for MerCruiser 4.3L V6 engines with a 1-piece exhaust manifold and a Y-pipe (bullhorn) that uses a 2.98-inch cross pin. Always verify your engine model and serial number against our compatibility table before ordering.
What are the signs of a failing exhaust water shutter?
Common symptoms include a rattling noise from the exhaust at idle, backfiring, or difficulty starting. In severe cases, a failed shutter can allow water to enter the engine, leading to hydrolock and catastrophic failure. Visual inspection may reveal cracked, brittle, or missing flaps.
Why is replacing the shutter important?
The shutter acts as a one-way valve to let exhaust out while preventing water from flowing back into the engine, especially when the boat is coming off plane or in reverse. A faulty shutter compromises this protection, risking severe water damage to internal engine components.
Can I reuse my old grommets?
It is strongly recommended to use the new grommets included in the kit. Old grommets can become hardened, cracked, and lose their sealing ability, leading to an improper fit for the new shutter.
How often should an exhaust shutter be inspected or replaced?
We recommend inspecting the shutters annually or every 100 hours of operation, particularly for boats used in saltwater. Replacement should occur whenever they show signs of wear, damage, or brittleness.
What is the difference between OEM and this aftermarket part?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials and functional performance. All parts are manufactured in an ISO 9002 facility and are batch-inspected for quality and consistency.
What are the shipping speed and cost?
We ship worldwide quickly—typical transit is 5–15 days for most regions. Standard shipping is free, with expedited options appearing at checkout where available for your location.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter an issue, please contact our support team with your order details. Returns are accepted within our standard window provided the item is unused and in its original packaging. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part before installation. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement part, not an original equipment manufacturer (OEM) component.
- Professional installation is recommended for safety and to ensure optimal performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world reliability and performance.
- Fast Global Fulfillment — We offer free standard delivery to most regions, with typical transit times of 5–15 days.
- Manufacturer-Direct Value — By working directly with manufacturers, we provide fair pricing without compromising on materials or quality control.
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