SKU: 53678813491

Water Shutter Kit – Fits MerCruiser V6/V8 Stern Drive Engines (Replaces 807166A1)

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Description

Water Shutter Kit – Fits MerCruiser V6/V8 Stern Drive Engines (Replaces 807166A1)Water Shutter Kit Fits MerCruiser V6 V8 Stern Drive Engines (Replaces 807166A1) This water shutter kit is engineered for MerCruiser stern drive engines equipped with 4" exhaust systems, covering a wide range of V6 and V8 models from 1996 to the present. The water shutters function as essential check valves, preventing water from flowing back into the engine's exhaust system when it is shut off or idling at low RPMs. This protects internal components

Water Shutter Kit – Fits MerCruiser V6/V8 Stern Drive Engines (Replaces 807166A1)

This water shutter kit is engineered for MerCruiser stern drive engines equipped with 4" exhaust systems, covering a wide range of V6 and V8 models from 1996 to the present. The water shutters function as essential check valves, preventing water from flowing back into the engine's exhaust system when it is shut off or idling at low RPMs. This protects internal components from water damage and corrosion.

This kit is a direct aftermarket replacement for MerCruiser part 807166A1 and other equivalent part numbers. It includes all necessary components for a complete renewal of the exhaust bellows and water shutters, ensuring a proper seal and reliable performance.

  • Installation Location: Mounts inside the exhaust Y-Pipe.
  • Engine Compatibility: Fits gasoline MerCruiser V6 & V8 engines with 4" exhaust systems.
  • Complete Kit: Includes water shutters, upper/lower bellows, and stainless steel clamps.

Part Number Cross-Reference

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

Brand Part Number
MerCruiser 807166A1
Sierra 18-2732
GLM 89170
Mallory 9-42802

Compatible Engine Models

Confirm your engine model/year in the table below.

MerCruiser Sterndrive Models

Brand Model Rated HP Stroke Years OEM Part No. Notes
MerCruiser 4.3L (2 BBL.) GM 262 V-6 Various 4-Stroke 1988-1992 807166A1
MerCruiser 4.3LX (4 BBL.) GM 262 V-6 Various 4-Stroke 1988-1992 807166A1
MerCruiser 4.3L (GEN II) (2 BBL.) GM 262 V-6 Various 4-Stroke 1992-1995 807166A1
MerCruiser 4.3LX (GEN II) (4 BBL.) GM 262 V-6 Various 4-Stroke 1992-1995 807166A1
MerCruiser 5.0L (2 BBL.) GM 305 V-8 Various 4-Stroke 1988-1995 807166A1
MerCruiser 5.0LX (4 BBL.) GM 305 V-8 Various 4-Stroke 1988-1995 807166A1
MerCruiser 5.7L GM 350 V-8 Various 4-Stroke 1988-1995 807166A1
MerCruiser 5.7L ALPHA EFI (TBI) GM 350 V-8 Various 4-Stroke 1995 807166A1
MerCruiser 5.7L BRAVO EFI (TBI) GM 350 V-8 Various 4-Stroke 1995 807166A1
MerCruiser 7.4L BRAVO GM 454 V-8 Various 4-Stroke 1988-1991 807166A1
MerCruiser 7.4L BRAVO (GEN. V) GM 454 V-8 Various 4-Stroke 1992-1994 807166A1
MerCruiser 454 MAG. BRAVO (GEN. V) GM 454 V-8 Various 4-Stroke 1992-1994 807166A1
MerCruiser 454 MAG. BRAVO MPI GM 350 V-8 Various 4-Stroke 1995 807166A1

MerCruiser Inboard Models

Brand Model Rated HP Stroke Years OEM Part No. Notes
MerCruiser D3.0L VM 183 I/L5 Various 4-Stroke 1994-1995 807166A1 Diesel
MerCruiser D3.6L VM 219 I/L6 Various 4-Stroke 1994-1995 807166A1 Diesel
MerCruiser D4.2L/220 IDI VM 254 I/L6 Various 4-Stroke 1994-1995 807166A1 Diesel
MerCruiser D183 TURBO AC VM 183 I/L5 Various 4-Stroke 1990-1993 807166A1 Diesel
MerCruiser D219 TURBO AC VM 219 I/L6 Various 4-Stroke 1990-1993 807166A1 Diesel
MerCruiser D254 TURBO AC VM 254 I/L6 Various 4-Stroke 1990-1993 807166A1 Diesel
MerCruiser 530 D-TA VM 183 I/L5 Various 4-Stroke 1989 807166A1 Diesel
MerCruiser 636 D-TA VM 219 I/L6 Various 4-Stroke 1989 807166A1 Diesel

Technical Specifications

Specification Value
Product Type Exhaust Water Shutter Kit
Installation Exhaust Y-Pipe
Fuel Type Gasoline
Connection 4" Exhaust System
Housing Material Rubber/Neoprene
Housing Color Black
Dimensions Approximately 4" diameter (101.6 mm)
Operating Temperature Up to 105°C (221°F)
Warranty 1 Year (Aftermarket)
Other Technical Attributes 2-piece "clapper" design; prevents water backflow

Package Contents

  • 2 x Water Shutters/Flappers (Replaces 807166A1)
  • 2 x Lower Exhaust Bellows (Replaces 32-14358T / 32-14358001)
  • 2 x Upper Exhaust Bellows (Replaces 32-44348T / 32-44348001)
  • 4 x Stainless Steel Clamps

Installation Guide

  1. Safety First: Disconnect the boat's battery before beginning any work.
  2. Access Components: Gain access to the stern drive's exhaust Y-pipe where the bellows and shutters are located. This may require removing the drive unit.
  3. Remove Old Parts: Carefully cut and remove the old upper and lower exhaust bellows and their clamps.
  4. Extract Water Shutters: Reach into the Y-pipe and remove the old, worn water shutters. Note their orientation.
  5. Clean Surfaces: Thoroughly clean the mounting surfaces on the Y-pipe and bell housing, removing any old adhesive or rubber residue.
  6. Install New Shutters: Insert the new water shutters into the Y-pipe, ensuring they are oriented correctly to prevent water backflow.
  7. Install Bellows: Slide the new upper and lower bellows into place, ensuring a snug fit on both ends.
  8. Secure Clamps: Position the stainless steel clamps over the bellows and tighten them securely. Do not overtighten.
  9. Final Check: Re-install the drive unit if it was removed. Reconnect the battery. Once in the water, start the engine and check for any exhaust or water leaks around the new components.

Troubleshooting & FAQ

Q: How do I know if this kit fits my MerCruiser engine?

A: This kit is specifically designed for MerCruiser V6 and V8 stern drive engines from 1996 to present that use a 4" diameter exhaust system. It is critical to confirm your exhaust size. This kit will not fit V6 engines with a one-piece exhaust manifold, as those typically require part number 807166A2. Always check the compatible models list and your engine's specifications.

Q: What are the common signs of a failing water shutter?

A: The most common failure signs include a distinct rattling or "clapping" noise from the exhaust area at idle, water entering the engine cylinders (which can lead to hydrolock), or visible cracks, stiffness, or missing pieces on the old shutters during an inspection.

Q: What is the purpose of the 2-piece "clapper" design?

A: The 2-piece "clapper" design functions as a passive one-way check valve. The flappers are pushed open by exhaust pressure when the engine is running, allowing exhaust to exit freely. When the engine is off or at very low RPMs, they close to create a seal that prevents water from surging back up the exhaust pipe and into the engine.

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.
  • 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: 53678813491

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4.6 ★★★★★
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J
Just us …
Cuba, US
★★★★★ 5
BEST PILLOW OUT THERE! Great for back and side sleeping. So glad I found them!
Like a cloud! Really loving this pillow set! I have tried many different pillows trying to get rid of my neck pain to no avail. One of the pillows even had a chiropractor endorsing it - and then I found it was actually causing me jaw pain when I slept on my side because it was too firm and had no give. We are LOVING THIS CERVICAL NECK PILLOW! I have been using it consecutive nights as a back sleeper and side sleeper and my neck continues to feel pain-free, no cricks and when I sleep on my side there is no pressure on my jaw or shoulder pain. It has just enough support in all the right places and enough give in the center to allow my head to comfortably sink into the middle aligning my neck for comfort, and enough give it does not put pressure on my jaw from the side sleeping. It also came with 2 pillow cases that are soft - I love the way it keeps the frizzy of hair from developing around my face because my hair is sliding, rather than friction when I move in my sleep. This pillow is a Win-Win! Getting a set for my son too!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 19, 2026
M
M. H.
Lowell, US
★★★★★ 4
Great Pillows, But Made for Taller People
Clearly these pillows are high end, very well-made pillows that will last for, dare I say, decades, and they are supportive for the neck and spine... for some people. I got the set of two, one for myself and one for my husband. I am 5'4", about 165lbs, and he is 6'2" about 240lbs. So there is a big difference in size between us. The pillows arrived in a very small but high quality box, each rolled separately, and I thought for sure that they would take a while to roll out, fluff up, and unwrinkle, the way our bed and other pillows did. But that wasn't the case at all. These pillows immediately fluffed up and were usable with not a single wrinkle (see photos). The silk gray cases that come with them were also in no way wrinkled and fit like a glove. They were a little difficult to situate for me (the cases) because they must go on a certain way (my husband wants me to tell y'all that he got it right the first time). It took me three tries. But once they were on, they looked beautiful and the pillows felt very soft with them on. Now, that said, it was clear the moment I laid on it that it's made for someone taller, or rather, with a longer neck. When I lay on it, my head does not land on the center of the pillow where the bump is, where it's supposed to cradle my neck. My head instead lays directly on that bump, cocked up with my neck kinked. That's also because *I* am a side sleeper. Now if I lay on my back, my head lays a little more in the center. That is the only way this pillow slightly works for me. If you read the "instructions," it explains that there is a section for your head when you're laying on your back (the center dip) and a section for when you're on your side (the edges). Either way is too high for me. My neck isn't long enough. In order to get it into the correct position, I have to stretch it unnaturally. When I lay naturally, my neck is bent and kinked and hurts more in the morning than ever before. The feel of it, putting aside its side and dimensions, is very soft to the touch but also quite firm at the same time. It's not the kind of memory foam that takes a while to bounce back. It's bounces back immediately. It's very springy. The only way I can use this pillow is if I spin in around to keep the cervical support bump at the top and just lay over the flat portion, making it more like a regular pillow. It's still too high and stiff for me, but it's better. Now for my husband (6'2"), this pillow works great! He's a back sleeper and it really supports his neck. And he does sometimes lay on his side, and apparently it's supports his neck then too. His neck is long enough to reach that edge section for side sleepers and the center supportive dip for back sleepers. He loves it! He says, his neck feels great in the morning and it's his new favorite pillow. When I got this pillow set, it was listed at $340, and he said that it was not worth that price. But it is now listed at $169, and he's saying that is a much more reasonable price. I personally wouldn't pay that, but that's because the pillow doesn't work for me. I stand by my statement that these pillows are for taller people (or people with longer necks). But for him, he would pay it. I wish it worked for me. I'm a bit jealous, to tell you the truth.
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Reviewed in the United States on May 22, 2026
J
JSouth
Dallas, US
★★★★★ 5
Finally, a pair of pillows that look good on the bed and feel good on the neck.
As much as I like the comfort and support of a cervical neck pillow, they usually have a strange ufo-type look and are usually quite small. It's fine for use, but they are not a great look on the bed. I wanted something more welcoming and full-looking with the support of a c-pillow. This set actually met my hopes and needs. I love how the pillow has two strengths - firmer on one side, softer on the other. That makes it easy to find the best fit for your own neck shape and support needs. The pillows are large enough that side-by-side on a queen sized bed they look welcoming and like they could probably even have matching cases put on them instead of requiring specialty industrial-looking pillow cases like many do. Having proper neck support has reduced headaches and neck tension and allows for better sleep!
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Reviewed in the United States on June 1, 2026
S
Shlean
Lake Worth, US
★★★★★ 5
Perfect if you're in the right position, not so perfect otherwise
I've been using this for about a week and I like it, but with some caveats. It is shaped so you can only sleep in 2 positions and you can't really move in bed. As long as you are in the correct position, it is really comfortable and provides the best support you can ask for. The problem is if you move around in bed, it turns into a hinderance. With normal pillows, they more or less move with you and are comfortable as you move. This is very specifically great in a single position, but terrible in any other position. If you are able to keep still, this is the perfect pillow for you. If you are like me and roll around too much, its more of a problem for sleeping than a help. I am going to move it over to my couch for napping with, and I think it'll work out far better since the couch isn't really big enough to roll around.
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Reviewed in the United States on May 23, 2026
R
Verified Purchase
RMiller
Lake Worth, US
★★★★★ 5
Great quality
Size: Twin, Color: White
This mattress pad is just thick enough without being overly bulky which tends to bunch up after washing. It is super soft and fits twin bed perfectly with just enough padding to add comfort. For a waterproof cover this one is superior to others I've had.
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Reviewed in the United States on March 16, 2026

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