SKU: 74865379303

Water Shutter Assembly – Fits MerCruiser V6/V8 Engines (Replaces 807166A1, 807166A2)

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Description

Water Shutter Assembly – Fits MerCruiser V6/V8 Engines (Replaces 807166A1, 807166A2)Water Shutter Assembly Fits MerCruiser V6 V8 Engines (Replaces 807166A1, 807166A2) This water shutter assembly is designed for MerCruiser V6 and V8 sterndrive engines from 1996 to the present, including 4. 3L (262 CID), 5. 0L (305 CID), and 5. 7L (350 CID) models equipped with a two piece exhaust manifold. This component is a direct replacement for MerCruiser part numbers 807166A1, 807166A2, and the 807166A3 kit. It serves the critical function of

Water Shutter Assembly – Fits MerCruiser V6/V8 Engines (Replaces 807166A1, 807166A2)

This water shutter assembly is designed for MerCruiser V6 and V8 sterndrive engines from 1996 to the present, including 4.3L (262 CID), 5.0L (305 CID), and 5.7L (350 CID) models equipped with a two-piece exhaust manifold.

This component is a direct replacement for MerCruiser part numbers 807166A1, 807166A2, and the 807166A3 kit. It serves the critical function of preventing water from flowing back into the engine through the exhaust system, which can cause severe damage like engine hydrolock.

  • Installation Location: Mounts inside the exhaust Y-Pipe.
  • Engine Compatibility: Fits gasoline MerCruiser V6 & V8 engines (1996+).
  • Complete Kit: Includes the water shutter and two required grommets for a drop-in installation.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Brand Part Number Notes
MerCruiser 807166A1 Shutter
MerCruiser 807166A2 Shutter
MerCruiser 807166A3 Kit (includes shutter and grommets)

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Brand Model Rated HP Stroke Years OEM Part No. Notes
MerCruiser 4.3L V6 Various 4-Stroke 1996+ 807166A1/A2 With Gen+ engines and 2-piece manifold
MerCruiser V6 & V8 Various 4-Stroke 1996+ 807166A1 Gen+ with larger Y-pipe
MerCruiser Alpha/Bravo Various 4-Stroke 1996+ 807166A1 Must match Y-pipe model

Technical Specifications

Specification Value
Product Type Exhaust Water Shutter Assembly
Installation Y-Pipe
Fuel Type Gasoline
Connection Drop-in with grommets
Housing Material Rubber with steel rod
Housing Color Black
Fitting Type Drop-in
Other Technical Attributes Prevents water backflow into engine; failure can result in engine hydrolock

Package Contents

  • 1 x Water Shutter Assembly (Replaces 807166A1/807166A2)
  • 2 x Grommets (Replaces 25-8M0204688)

Installation Guide

  1. Safety First: Disconnect the boat's battery before beginning work on the engine or exhaust systems.
  2. Access the Y-Pipe: Locate and access the exhaust Y-pipe where the upper exhaust hoses connect. This may require removing other components.
  3. Remove Old Shutter: Carefully remove the old, failed water shutter and its grommets from within the Y-pipe.
  4. Clean the Surface: Thoroughly clean the mounting surfaces inside the Y-pipe to ensure a proper seal for the new grommets.
  5. Install New Grommets: Insert the two new grommets into the designated holes inside the Y-pipe.
  6. Install New Shutter: Carefully insert the pins of the new water shutter assembly into the grommets until it is securely seated.
  7. Verify Function: Ensure the shutter can swing open and closed freely without binding.
  8. Reassemble Exhaust: Reconnect any exhaust hoses or components that were removed for access.
  9. Final Check: Reconnect the battery. Start the engine and check for any exhaust or water leaks around the service area.

Troubleshooting & FAQ

How do I know if I need to replace my water shutter?

Common signs of a failed water shutter include a rattling noise from the exhaust, evidence of water in the engine oil, engine overheating, or difficulty starting. The most critical sign is finding water in the cylinders, which indicates engine hydrolock, a severe condition that a functioning shutter helps prevent.

What is the purpose of a water shutter?

It acts as a one-way valve located in your exhaust Y-pipe. It opens to let exhaust gases out when the engine is running and closes to prevent water from flowing back into the engine cylinders when the engine is off or when decelerating quickly.

What engines does this water shutter assembly fit?

It is designed for a wide range of MerCruiser V6 and V8 engines made from 1996 and onward, specifically those with "Gen+" (Generation Plus) architecture and a two-piece exhaust manifold. Always confirm your engine model and year before ordering.

Is this a single part or a complete kit?

This is a complete replacement assembly that includes one water shutter and a pair of new grommets required for a proper installation. This corresponds to what MerCruiser sells as kit 807166A3.

OEM vs. Aftermarket?

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.

How fast do you ship and how much does it cost?

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.

What is your warranty and return policy?

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.
  • Fast Global Shipping: Free delivery worldwide in 5–15 days.
  • Direct from Manufacturer: Competitive pricing without compromising quality.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 74865379303

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Los Angeles, US
★★★★★ 4
good for non-white skin
Scent: Fragrance Free, Size: 1.7 Fl Oz (Pack of 1)
Moisturizing, non-sticky, works for my sensitive skin. It's transparent and doesn't leave a white cast on my light brown skin. Smallish size is good for travel and purse. It's a little shiny; wish it came in matte.
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Reviewed in the United States on March 21, 2026
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J-C
Lake Worth, US
★★★★★ 5
Very effective
Scent: Fragrance Free, Size: 1.7 Fl Oz (Pack of 1)
I love this sunscreen for your face. It doesn’t feel oily. It doesn’t stay white on your skin. It absorbs and it really protects it nicely. I put it on every morning before I walk my dog in the sun and I’m out for normally at least an hour so it’s a really nice sunscreen and I would definitely give it a try.
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Reviewed in the United States on February 22, 2026
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Kassandra N
Carnegie, US
★★★★★ 5
Lightweight, clean, and effective — worth the repurchase
Scent: White Tea, Size: 1.7 Fl Oz (Pack of 1)
This is my go-to daily sunscreen. It’s lightweight, non-greasy, and absorbs quickly without leaving a white cast. I love that it’s made with clean ingredients and doesn’t irritate my sensitive skin. The white tea scent is subtle and fresh. I’ve repurchased this several times now — it’s one of the few sunscreens I actually enjoy using.
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Reviewed in the United States on June 25, 2025
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Beachreader
Pawtucket, US
★★★★★ 5
Great replacement for my discontinued Epionce sunblock
Scent: White Tea, Size: 1.7 Fl Oz (Pack of 1)
I really hate it when companies discontinue great products, and even though it cost a fortune, I loved the Epionce mineral sun block for faces. When I realized it was gone, I looked at the Coola line because I like their other products. Found this face sunblock for $32 (this could be 1/3 of the Epionce, certainly 1/2) and have used it for the past few weeks playing golf. So far, so good! I'm not noticing any color, certainly no burn. No irritation, and the scent is quite mild, only noticeable when it's first applied (IMO, and I'm pretty sensitive to scents). I really like that Coola has the Hawaii reef-safe designation, which I think is very important for all sunscreens, even when we're not going swimming in the ocean. As a friend pointed out to me once, even if you don't swim in the ocean, you go home and take a shower and all those chemicals wash down the drain and make their way eventually through the system, so might as well just not use them in the first place! Yes, it's more expensive using products like this, but IMO it's worth it. I also wear sun sleeves these days so I don't have to use as much sunscreen when I'm out on the golf course. Editing this to say that this product has avobenzone, which is actually not so great and may be banned in Hawaii by next year. Hmm. Guess I'll keep searching!
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Reviewed in the United States on July 7, 2023
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Kay Lodz
West Palm Beach, US
★★★★★ 5
It works
Size: 1.7 Fl Oz (Pack of 1)
I invested in this for its travel size and my needs for a product that would protect my skin and not make it feel super oily. This delivers!!! I used it for a week in Florida with UV up to 11 on some days and didn't face a single issue, even after a Disney day. I was almost in disbelief at how lightweight this product is for it to work properly, but the protection strength is fabulous. I don't burn in the sun, but if I do, its typically along my face where the bridge of my nose is or my upper cheeks. This product basically said, "not today, sun." Bonus, it didnt burn or sting my eyes all day in Disney parks heat, and I didn't need to reapply even though I brought it just in case. Maybe it was the product or the Disney magic, but my skin also didn't look oily or shiny at all in my pictures with the product offering a nice matte finish.
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