Pay in installments of $18.70 with
,
and
Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Aug 24 - Aug 29
Promo Codes Available:
For Your Every Summer RSVP, with Code: SUMMER15
Description
Water Shutter Kit – Fits MerCruiser V6/V8 Stern Drives (Replaces 807166A3)Water Shutter Kit Fits MerCruiser V6 V8 Stern Drives (Replaces 807166A3) This aftermarket water shutter and bellows kit is engineered for MerCruiser stern drive engines equipped with 4 inch exhaust systems, covering most V6 and V8 models from approximately 1982 through 1996. It serves as a direct replacement to prevent water from backing up into the engine through the exhaust. This kit directly replaces Mercury MerCruiser part numbers 807166A3 and
Water Shutter Kit – Fits MerCruiser V6/V8 Stern Drives (Replaces 807166A3)
This aftermarket water shutter and bellows kit is engineered for MerCruiser stern drive engines equipped with 4-inch exhaust systems, covering most V6 and V8 models from approximately 1982 through 1996. It serves as a direct replacement to prevent water from backing up into the engine through the exhaust.
This kit directly replaces Mercury/MerCruiser part numbers 807166A3 and 807166A1; Sierra 18-2732-9; GLM 89170; and Mallory 9-42802.
- Function: The two-piece "clapper" design prevents water ingestion into the engine.
- Installation Location: Mounts inside the exhaust Y-pipe.
- Complete Kit: Includes shutters, upper and lower bellows, and all necessary clamps for a full replacement.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Mercury/MerCruiser | 807166A3 |
| Mercury/MerCruiser | 807166A1 |
| Sierra | 18-2732-9 |
| GLM | 89170 |
| Mallory | 9-42802 |
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.
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 | 807166A3 | |
| MerCruiser | 4.3LX (4 BBL.) GM 262 V-6 | Various | 4-Stroke | 1988-1992 | 807166A3 | |
| MerCruiser | 4.3L (GEN II) (2 BBL.) GM 262 V-6 | Various | 4-Stroke | 1992-1995 | 807166A3 | |
| MerCruiser | 4.3LX (GEN II) (4 BBL.) GM 262 V-6 | Various | 4-Stroke | 1992-1995 | 807166A3 | |
| MerCruiser | 5.0L (2 BBL.) GM 305 V-8 | Various | 4-Stroke | 1988-1995 | 807166A3 | |
| MerCruiser | 5.0LX (4 BBL.) GM 305 V-8 | Various | 4-Stroke | 1988-1995 | 807166A3 | |
| MerCruiser | 5.7L GM 350 V-8 | Various | 4-Stroke | 1988-1995 | 807166A3 | |
| MerCruiser | 5.7L ALPHA EFI (TBI) GM 350 V-8 | Various | 4-Stroke | 1995 | 807166A3 | |
| MerCruiser | 5.7L BRAVO EFI (TBI) GM 350 V-8 | Various | 4-Stroke | 1995 | 807166A3 | |
| MerCruiser | 7.4L BRAVO GM 454 V-8 | Various | 4-Stroke | 1988-1991 | 807166A3 | |
| MerCruiser | 7.4L BRAVO (GEN. V) GM 454 V-8 | Various | 4-Stroke | 1992-1994 | 807166A3 | |
| MerCruiser | 454 MAG. BRAVO (GEN. V) GM 454 V-8 | Various | 4-Stroke | 1992-1994 | 807166A3 | |
| MerCruiser | 454 MAG. BRAVO MPI GM 350 V-8 | Various | 4-Stroke | 1995 | 807166A3 |
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 | 807166A3 | Diesel |
| MerCruiser | D3.6L VM 219 I/L6 | Various | 4-Stroke | 1994-1995 | 807166A3 | Diesel |
| MerCruiser | D4.2L/220 IDI VM 254 I/L6 | Various | 4-Stroke | 1994-1995 | 807166A3 | Diesel |
| MerCruiser | D183 TURBO AC VM 183 I/L5 | Various | 4-Stroke | 1990-1993 | 807166A3 | Diesel |
| MerCruiser | D219 TURBO AC VM 219 I/L6 | Various | 4-Stroke | 1990-1993 | 807166A3 | Diesel |
| MerCruiser | D254 TURBO AC VM 254 I/L6 | Various | 4-Stroke | 1990-1993 | 807166A3 | Diesel |
| MerCruiser | 530 D-TA VM 183 I/L5 | Various | 4-Stroke | 1989 | 807166A3 | Diesel |
| MerCruiser | 636 D-TA VM 219 I/L6 | Various | 4-Stroke | 1989 | 807166A3 | Diesel |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Exhaust Water Shutter Kit |
| Installation | Exhaust Y-Pipe |
| Fuel Type | Gasoline |
| Connection | 4-inch Exhaust System |
| Housing Material | Rubber/Neoprene |
| Housing Color | Black |
| Dimensions | Approx. 4 inches 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 807166A3)
- 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
- Safety First: Begin by disconnecting the boat's battery to prevent any accidental starts.
- Access the Stern Drive: Depending on your boat's configuration, gain access to the stern drive's exhaust components.
- Remove Old Bellows: Loosen the clamps and carefully remove the old upper and lower exhaust bellows.
- Remove Old Shutters: Extract the old, worn water shutters from the exhaust Y-pipe. Take note of their orientation.
- Clean Surfaces: Thoroughly clean the Y-pipe and exhaust tube surfaces where the new bellows will be seated.
- Critical Fitment Check: This kit will not work on V6 engines with one-piece manifolds or early V8 models with a round pin going through the flapper. Verify your system before proceeding.
- Install New Shutters: Insert the new water shutters into the Y-pipe, ensuring they are correctly oriented and can move freely.
- Install New Bellows: Fit the new upper and lower bellows into position and secure them tightly with the new stainless steel clamps.
- Final Check: Re-connect the battery. Start the engine and check for any exhaust leaks around the new bellows.
Troubleshooting & FAQ
Q: How do I know if this kit fits my MerCruiser engine?
A: This kit is designed for MerCruiser V6 and V8 stern drives from 1982-1996 with a 4-inch exhaust system. Please check the compatibility tables on this page to confirm your specific model and year. It is crucial to note this will not fit V6 engines with one-piece exhaust manifolds or early V8 models that use a round pin through the flapper.
Q: What is the purpose of the "water shutter" or "flapper"?
A: The water shutter is a critical component in your exhaust system that prevents water from flowing back into the engine cylinders when the engine is off or at idle. A functioning shutter protects your engine from catastrophic water damage.
Q: What are signs that my old water shutters have failed?
A: Common signs of failure include rattling noises from the exhaust at idle, engine overheating, or difficulty starting. Upon visual inspection, you might find the old shutters are broken, brittle, missing pieces, or have fallen into the exhaust pipe.
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:
- 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
4.7 ★★★★★
Based on 19 reviews
Sort
Product Reviews
★★★★★ 5
Love this protection plan
Quick and easy. My daughter's cracked her screen on her phone, as soon as it happened I went on the app, filed the claim. Ten minutes later I received the email with the shipping lable. The following day I dropped the phone off at ups and 4 hours later I received the digital gift card. Ive filed several claims since getting the protection plan and with four kids its definitelysomething im glad to have especially since i dont have to buy a protectionplan for each item now. I have filed claims for electric scooter the stoped working for no reason, my son's phone stopped charging, my oldest daughter cracked her phone screen, my son's video game controllers up and died and each time it was quick and easy and no fuss
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 13, 2026
★★★★★ 1
Don't waste your money - these people will not help you
On March 9th 2024, I purchased a MCombo Lift Chair costing $785. On the same day, through the same Amazon account (my PERSONAL account since I also have a business account), I purchased an Asurion Complete Protect policy at the cost of $16.99 per month plus taxes. About one month ago, a problem arose with the chair that required me to make a claim using the "Complete Protect" policy that I had purchased for that very item. The claim was initiated on January 1st, 2025 - On January 3rd, I received an email asking me for photographs showing the damage for which I was making a claim. I sent those photographs via email to the address provided on January 6th. On January 27th, having not received ANY response from Asurion, I contacted them via phone and was told that my purchase had been made with a business account, that it was being used for business purposes, and was therefore not covered. I assured the Asurion Representative that it was most certainly not a business use, and that the chair that I was claiming for had been purchased because I had extensive shoulder surgery done that made it impossible to get in and out of bed. After speaking (unsuccessfully) with the Asurion Rep, I then contacted Amazon Customer Service. I spoke with an Amazon Customer Service Representative on the phone who confirmed that I had in fact used my personal account to purchase the chair and the Asurion Complete Protect policy. That representative went on to send a message to Asurion on my behalf confirming that the purchase was for personal use and not business use. Asurion responded, asking me to call them with the order number for the Asurion purchase. The number I gave was the exact same order number on my order history, however, the Asurion Rep could not find it. I was finally able to discover that the order number in Asurion's system was entirely different and isn't even in the same format as an Amazon order number.
Upon the Asurion representative finding my plan, she informed me that the chair was listed as being purchased for business use (despite Amazon confirming that it was NOT) but that I should give them "a couple of business days" to resolve the issue. Five business days later, still no response and so I called them again (Yesterday - February 1st 2025)... Lo and behold, I got the same crap yet again... the purchase was listed as business use and was therefore being denied, but she promised to remove the business use commentary and put the claim through again.
Today, February 2nd, I called Amazon yet again to escalate and had to call THREE times because the first two calls resulted in me finally being connected to an Asurion representative (two different reps) and each time, the Asurion representative hung up the phone as soon as my name was mentioned.
It has become clear to me that the Asurion "Complete Protect" policy is a SCAM - they will NOT take care of your issue, regardless of how long you've been paying. I have been paying every month since March 9th last year - so they've received over $170 from me thus far, with zero other claims, and if I am able to cancel right now, I will only receive $16.99 back. All I want, is the chair that I purchased the policy for coverage of, to be repaired or replaced. Asurion are NOT helping, and are actively avoiding contact.
At this point, I am considering legal action against Asurion for fraud - perhaps even a Class Action. I'll wait and see if my issue gets resolved within the next 10 days or so.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 2, 2025
★★★★★ 5
Asurion is AWESOME!
Ok, so let me start with the fact that you should NOT waste your time calling Amazon's customer service if you think you have a claim under Asurion's monthly protection plan. CALL ASURION!
I wasted almost an hour with Amazon representatives that have absolutely no training in how the Asurion plan works, or even any idea if my item was covered. In fact, they told me the mechanized chair I purchased under the plan wasn't covered!
Finally, my call got escalated to a manager who was just as clueless about my coverage, but had the best idea ever... call Asurion!
The smartest thing I did that morning was hang up with Amazon, and reach out to Asurion as I should have done in the first place.
Dealing with Asurion's customer service, after my Amazon call, was like being elevated to VIP status! 😄
Asurion's rep nicely took all my info, including the chair's purchase date and order number. Then they asked that I upload a couple of pictures of the product, along with a written description of the malfunction I had mentioned over the phone.
This is where it gets really good. They told me they'd review the claim to determine if they'd send a repair
specialist or reimburse me the cost of the item. In less than 48 hours, they determined that a payout was in order, and sent me an email that included an Amazon gift card for the total cost of the item minus the taxes I had paid, which I loaded directly into my Amazon wallet. Apparently, Asurion does not include the purchase taxes in their coverage.
But, I can live with that.
All in all, Asurion's claims division get a double thumbs up 👍🏽👍🏽, and the company gets big ups from me for not only standing behind their protection plan, but doing so expeditiously!
Special note: If you buy a lot of stuff from Amazon, and have Asurion's monthly protection plan, scroll the item listing before pulling the trigger on your purchase... you need to see the green streamer that indicates your product is protected by the plan. If you don't see that, check to see if there are alternative products that might be covered. There are very few electronic or high ticket items that aren't covered, but looking for that green banner in the item description that says it's covered is key to foregoing any future headaches.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 26, 2026
★★★★★ 5
If they can't fix it they will replace it.
This protection plan that i pay monthly for paid for itself ten fold. My 3D printer just quit working and after the manufacturer warrenty had ran out at that. I submitted my claim they emailed me a shipping label in which I shipped out my printer that same day. Two days later they received my printer determined it couldc not be fixed and sent me a Amazon gift card for the full price of my printer. Today I will be receiving my new 3d printer thanks to Complete Protect. I highly recommend anyone and everyone to purchase this policy. This warrenty is like having a home warrenty like Homeshield but for your electronics and probably other stuff that i just have not read to see what else. This insurance will save me so much money over the corse of this year and every year after that. Thank you Complete Protect.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 22, 2026
★★★★★ 5
Chromebook coverage.
EXCELLENT COVERAGE, hassle free, just had to return product for evaluation & decision.
The only complaint I have is there was NO communication on the status of my returning the Chromebook for repair or replacement. I had to keep calling. I did get the full value of purchase on an Amazon gift card so I could buy another one for grandson’s school.
Thank You SOOO MUCH ASURION, eternally grateful for your assistance!
Will always purchase your coverage.
MiMi
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 5, 2026