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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Ashley Morgan
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Reviewed in the United States on September 30, 2025
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Carmen Alicea
San Leandro, US
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Dark, emotional, and unexpectedly tender, Not Ready is an omegaverse romance that delivers found family feels, fierce protectiveness, and a very pregnant heroine who refuses to break. Vale’s on the run from a stalker, but lands in the arms of three private security alphas, cue the swoony tension, fake marriage twist, and slow-burn heat. It’s a little gritty, a little soft, and a whole lot addictive. If you love protective alphas, high stakes, and heroines with quiet strength, this one’s a must-read.
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Reviewed in the United States on December 18, 2025
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Shianne Whipple
Grantham, US
★★★★★ 5
Strong Omegaverse Comfort and a Attention Grabbing Plot
Format: Kindle
Jillian West never misses when it comes to Omegaverse, and Not Ready is no exception. This story was the perfect blend of cozy comfort and emotional depth while still delivering a strong plot. Vale is such a powerful heroine, she is strong, capable, and determined but I love that she still allows her pack to love and take care of her. It’s that balance of independence and vulnerability that makes her so relatable. The relationship dynamics were amazing: Bishop is steadfast and completely head over heels, Mercy is skeptical but protective in his own way, and Holt is the hesitant one whose slow fall is so satisfying to watch unfold. The romance hits that sweet spot between insta-love and cautious build, keeping me hooked the entire way through. And that ending. Oh my god, the cliffhanger! I need the next book in this duet immediately.
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Reviewed in the United States on August 28, 2025
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NLB
Natrona Heights, US
★★★★★ 5
Interesting
Format: Kindle
So I will say I enjoyed the story, for sure had its moments where it dragged but it was a great story. I really liked that omegas picked their alphas/make the pack. Normally the Alphas make it and the omega fits in with them which is great but I enjoyed this new version where all the power basically went to the omega. It was a nice change of pace. I can admit some of the weird bedroom stuff with her being pregnant was odd, it’s really not hard to do stuff when pregnant (I know I’ve had two and it’s normal and even encouraged at the end especially if you want the baby out). But I like the story as a whole and will read the second, I do hope the next one isn’t dragged bc it stopped being action or tense after she met her alphas and I don’t think it was brought up or properly done when they tried to do it. More sweet after she left.
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Reviewed in the United States on November 11, 2024
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Altairjones
Phoenix, US
★★★★★ 3
I’m a little disappointed.
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I usually like Jillian West’s books but this one was missing a lot for me. The pregnancy didn’t come across as real. She’s on her feet for 12 hour days but is perfectly healthy at 8 months pregnant? Yet the week she moves in all of a sudden she’s not? She is planning on actually running during one of the plot buildups. But at 8 months pregnant that’s incredibly hard to do. The lack of breathing ability and lung space, the change in body center, mass, and gravity. All of it prohibits running, unless you’re an athlete this didn’t come off as at all realistic. I didn’t feel any connection with the alphas. There wasn’t any emotional connection. It could be because of the tense it was written in. But I didn’t get any deep feelings out of this. It came across as checking off boxes. Even the spicy scenes weren’t really believable for me. I wanted to see them fall for her, and it just kind of all fizzled. Even Bishop. One thing I did really like was the ending. I did not see it coming and I’m interested in reading book two because of it. But on the whole this book was mostly disappointing for me.
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