SKU: 10762363530

Water Pump Repair Kit – Fits Mercury 175-300HP & 450R V6/V8 4-Stroke Outboards (Replaces 8M0205803, 8M0142980)

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Description

Water Pump Repair Kit – Fits Mercury 175-300HP & 450R V6/V8 4-Stroke Outboards (Replaces 8M0205803, 8M0142980)Water Pump Repair Kit Fits Mercury 175 300HP & 450R V6 V8 4 Stroke Outboards This water pump repair kit is designed for Mercury Marine 175 300HP 3. 4L V6 and 4. 6L V8 4 stroke outboards (2019 and newer, serial number 2B529482 and above), including 450R models. It serves as a direct replacement for multiple OEM part numbers, ensuring a precise fit and reliable performance for your engine's cooling system. Installation Method: Direct replacement for a

Water Pump Repair Kit – Fits Mercury 175-300HP & 450R V6/V8 4-Stroke Outboards

This water pump repair kit is designed for Mercury Marine 175-300HP 3.4L V6 and 4.6L V8 4-stroke outboards (2019 and newer, serial number 2B529482 and above), including 450R models.

It serves as a direct replacement for multiple OEM part numbers, ensuring a precise fit and reliable performance for your engine's cooling system.

  • Installation Method: Direct replacement for a straightforward installation.
  • Engine Compatibility: Specifically fits Mercury V6/V8 4-stroke outboards with serial number 2B529482 and above.
  • Complete Kit: Includes the impeller, face plate, gaskets, seals, and installation tool for a comprehensive service.

Part Number Cross-Reference

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

Brand Part Number
Mercury 8M0205803
Mercury 8M0142980
Mercury 47-8M0205803
Mercury 98-8M0142980

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
Mercury 3.4L V6 175 4-Stroke 2019 and newer 8M0205803 Serial no. 2B529482 and above
Mercury 3.4L V6 200 4-Stroke 2019 and newer 8M0205803 Serial no. 2B529482 and above
Mercury 3.4L V6 225 4-Stroke 2019 and newer 8M0205803 Serial no. 2B529482 and above
Mercury 4.6L V8 200 4-Stroke 2019 and newer 8M0205803 Serial no. 2B529482 and above
Mercury 4.6L V8 225 4-Stroke 2019 and newer 8M0205803 Serial no. 2B529482 and above
Mercury 4.6L V8 250 4-Stroke 2019 and newer 8M0205803 Serial no. 2B529482 and above
Mercury 4.6L V8 300 4-Stroke 2019 and newer 8M0205803 Serial no. 2B529482 and above
Mercury Racing 450R 4-Stroke 2019 and newer 8M0205803 Serial no. 2B529482 and above

Technical Specifications

Specification Value
Product Type Water Pump Repair Kit
Installation Direct replacement
Other Technical Attributes For Mercury V6/V8 4-stroke outboards with serial number 2B529482 and above

Package Contents

  • 1 x Water Pump Gasket (8M0205803)
  • 1 x Face Plate (8M0205803)
  • 1 x Face Plate Gasket (8M0205803)
  • 1 x Impeller Key (8M0205803)
  • 1 x Impeller (8M0205803)
  • 1 x Face Seal (8M0205803)
  • 1 x Drain Plug Seal (8M0205803)
  • 1 x Water Pump Gasket (8M0205803)
  • 1 x O-Ring (8M0205803)
  • 1 x Actuator Seal (8M0205803)
  • 1 x Face Seal Tool (8M0205803)

Installation Guide

  1. Disconnect the negative battery cable to prevent accidental starting. Place the engine in neutral.
  2. Remove the lower unit (gearcase) from the outboard by unbolting it from the midsection. This may require an assistant.
  3. Place the lower unit on a workbench and remove the bolts securing the water pump housing.
  4. Slide the old housing, impeller, gaskets, and wear plate off the driveshaft. Note the orientation of the old impeller blades.
  5. Clean all mating surfaces of any old gasket material or debris.
  6. Install the new components in reverse order: gaskets, wear plate, impeller key, and impeller. Lightly grease the new impeller and slide it on while turning the driveshaft clockwise.
  7. Install the new face seal, tool, plate gaskets, and housing. Ensure all seals are properly seated.
  8. Torque the housing bolts to the manufacturer's recommended specification.
  9. Reinstall the lower unit onto the outboard, making sure the driveshaft and water tube align correctly.
  10. Reconnect the battery. Start the engine using a water source (flushing muffs or in water) and immediately check for a steady stream from the tell-tale outlet.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my specific Mercury outboard?
A: This kit is designed for Mercury 3.4L V6 and 4.6L V8 4-stroke outboards from 2019 and newer, specifically with a serial number of 2B529482 and above. Please check your engine's serial number plate to confirm compatibility before ordering.

Q: What are the signs my water pump is failing and needs replacement?
A: Common signs of a failing water pump include a weak or no water stream from the "tell-tale" outlet, engine overheating alarms, or steam from the exhaust. Reduced engine performance at high RPMs can also indicate a cooling issue.

Q: How often should I replace my outboard's water pump kit?
A: As a crucial part of preventative maintenance, it is recommended to inspect the impeller annually and replace the entire water pump kit every two to three years or every 200-300 hours of use. This interval may be shorter if you frequently operate in sandy, silty, or saltwater conditions.

Q: Does this kit include the plastic water pump housing?
A: No, this is a repair kit containing the primary wear components like the impeller, gaskets, seals, and face plate. The upper housing is not included and should be inspected for warping or damage before installing this kit.

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: 10762363530

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4.7 ★★★★★
Based on 29 reviews
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Product Reviews
A
Verified Purchase
Amazon Dot Comment
Omaha, US
★★★★★ 1
Torn to shreds by a puppy.
Style: Bunny
Torn to shreds by a puppy.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 10, 2026
A
Verified Purchase
April
Grantham, US
★★★★★ 5
So many squeakers!
Color: Squeaker Matz Gator, Size: X Large (Pack of 1)
I have 3 golden retrievers. They love this toy. While the head came off because they played tug-o-war with it, the rest has held up mostly for 5-6 months. At this point sometimes a squeaker will pop out. There are so many squeakers in this toy! However, they still use it for tug-o-war, I am surprised it has lasted this long. There is only stuffing in the head.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 9, 2026
L
Verified Purchase
L. Beck
Phoenix, US
★★★★★ 5
Cute, durable toy.
Color: Squeaker Matz Gator, Size: X Large (Pack of 1)
It's about as durable as you can expect a stuffed animal to be. I have two new puppies who are still teething and they love these things. I got the Kyjen sheep mat version (it's a square shape, rather than the two rows of squeakers) for the little girl. Both dogs sleep with it in their crate and we take them on trips with us. I've gone so far as to open up the toy and replace the broken squeakers (costs about 5$ for 30 large squeakers). The rest of the toy is fine. Our german shepherd puppy absolutely loves the rattle that's located in the head of the gator as well. The rattle also helps initially getting the dog engaged with chewing on the toy rather than your clothing or furniture. Then they discover the squeakers and it's endless entertainment and a good distraction for your dogs. I haven't had any problems with the thin, decorative material that's represent the teeth, claws and back fins. It's a slightly thicker felt that's soft and flimsy. Honestly, I'm not worried about it. Even if they were to eventually chew these off, they're not a choking hazard. Our little guy has thrown up solid pieces of kibble that are larger and harder than this. Seriously now, common. The eyes are sewn into the head, so there's no risk of pulling them off and swallowing. I toss these in the washer on a gentle cycle to clean off the slobber and dirt about once every couple weeks and the squeakers are fine, though they sometimes have to dry out to be 100% functional again. It never takes long. Overall, I love the amount of squeakers just due to the breaking problem with have with single squeaker toys. Once they break, the dog loses interest. Which is also a nice way to train the dogs the difference between the non-squeaking kids toys. The dogs absolutely love this toy and wont sleep without it. When the fabric eventually wears out (not even a slight issue after a few months), I'll be buying another one.
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Reviewed in the United States on August 8, 2012
D
Verified Purchase
D. Vanhoose
Grantham, US
★★★★★ 5
Great Toy, HUGE, small dog loves,
Color: Squeaker Matz Gator, Size: X Large (Pack of 1)
For the price this is my favorite toy! My 4 lb Chihuahua LOVES this thing. He is smaller than it by a long shot, yet he loves to parade this around, showing how big he is and can handle this huge GATOR. LOL. Friends come up to the porch, and he runs back to grab his GATOR to bring it up for them to see. Only thing with these toys - for my dog - we have several of these he loves - he cannot make them squeak. He jumps on them, chews on them, but just doesn't have the power. That being said, think about it, he loves the things, I mean LOVES. Sleeps with them, parades them out, fights with them when he's alone, has a great time - .... Evidently, it's me - I MISS THE SQUEAK! I watch him, and root for him, and every now and then (rare), I hear he got a squeak. Still, he doesn't care! So.... interactive time! I go out and play with him and Mr. GATOR, and I make it squeak, and we all have EXTRA fun. Note, my little guy is what they call an EXTREMELY AGGRESSIVE CHEWER. He chews in his sleep (kidding). He's really a tough chewer. He however, uses these more for wrestling, and attacking, and carrying around and sleeping on, etc. So none of ours have tears in them, though he does attack and chew all of it - I think these products are super wonderful, and I have to buy several more, like the hide-a-toy ones (beehive, squirrel, etc.) because I know the quality, I know my Chihuahua loves them to pieces - while he hasn't actually been able to render them in pieces! Win-win for us. You decide what your dog is like. Mine has his snoopy blanket and a huge victory in his mind over this large GATOR - his friend all day long.
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Reviewed in the United States on June 16, 2012
C
Verified Purchase
Cam D
Birmingham, US
★★★★★ 4
Great Toy, But Not Durable
Color: Squeaker Matz Gator, Size: X Large (Pack of 1)
I bought this toy for my five-month-old American Eskimo dog, and he loved it! My dog isn't a big squeaker fan, but he had so much fun with this toy. He played with it nonstop for about an hour, and it was so fun to see him enjoying his toy. Unfortunately, I had to take it away from him because after a while, he was trying to rip out the ridges that line the alligator's back. He managed to rip out two already and was working on his third. I'm afraid that out of boredom, he will try to tear off the rest of the ridges and then the alligator's teeth and claws. I think that I will have to snip off all of the small pieces before giving this toy to my dog again. Even though the toy didn't stay intact for longer than 30-45 minutes, I don't regret buying it. It instantly caught my dog's attention and kept it. This is a good toy. It has 16 squeakers and would be a good cuddle toy since it's soft and big. This toy is longer than my dog! It's about 30 inches long!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 9, 2011

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