SKU: 85357739018

Water Pump Repair Kit – Fits Mercury/Mariner 9.9-15 HP 4-Stroke Outboards (Replaces 99157T2)

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Description

Water Pump Repair Kit – Fits Mercury/Mariner 9.9-15 HP 4-Stroke Outboards (Replaces 99157T2)Water Pump Repair Kit Fits Mercury Mariner 9. 9 15 HP 4 Stroke Outboards (Replaces 99157T2) This comprehensive water pump repair kit is engineered for specific Mercury and Mariner outboard engines. It is designed to fit 9. 9 HP 4 stroke (323cc) BigFoot models (USA made serial numbers 0G760300 0T979999 and Belgium assembled 0P075166 0P325499), and 15 HP BigFoot 4 stroke outboards (USA made serial numbers 0G590000 1B727495 and Belgium assembled 997311

Water Pump Repair Kit – Fits Mercury/Mariner 9.9-15 HP 4-Stroke Outboards (Replaces 99157T2)

This comprehensive water pump repair kit is engineered for specific Mercury and Mariner outboard engines. It is designed to fit 9.9 HP 4-stroke (323cc) BigFoot models (USA-made serial numbers 0G760300-0T979999 and Belgium-assembled 0P075166-0P325499), and 15 HP BigFoot 4-stroke outboards (USA-made serial numbers 0G590000-1B727495 and Belgium-assembled 997311 and up).

As a direct replacement for multiple OEM part numbers, this kit ensures a precise fit and restores cooling system performance. It is also compatible with a range of 2-stroke Mercury/Mariner models from 15 HP to 25 HP.

  • Engineered for higher flow rates and improved cooling efficiency.
  • Includes all necessary components for a complete overhaul, such as the housing, impeller, gaskets, and seals.
  • Direct replacement installation requires no special modifications.

Part Number Cross-Reference

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

Brand Part Number
Mercury/Mariner 99157T2
Mercury/Mariner 99157A2
Mercury/Mariner 99157A02
Mercury/Mariner 46-99157T2
Mercury/Mariner 46-99157A02
Mercury/Mariner 85098A2

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 BigFoot 9.9 (323cc) 4-Stroke 99157T2 USA Serial No. 0G760300-0T979999
Mercury BigFoot 9.9 (323cc) 4-Stroke 99157T2 BEL Serial No. 0P075166-0P325499
Mercury BigFoot 15 (323cc) 4-Stroke 1998+ 99157T2 USA Serial No. 0G590000-1B727495
Mercury BigFoot 15 (323cc) 4-Stroke 99157T2 BEL Serial No. 997311 & up
Mariner XD 15 2-Stroke 1997-1998 99157T2 BEL Serial No. 9927000 & up
Mercury/Mariner 18, 18XD 18 2-Stroke 1980-1985 99157T2 USA Serial No. 5837437 & up
Mercury/Mariner 18, 18XD 18 2-Stroke 1980-1983 99157T2 AUS Serial No. 8071973 & up
Mercury/Mariner 18, 18XD 18 2-Stroke 1980-1985 99157T2 BEL Serial No. 9308306 & up
Mercury/Mariner 20, 20XD 20 2-Stroke 1986-1987 99157T2 USA Serial No. 6443973-0T800749
Mercury/Mariner [Various models] 25 2-Stroke 1995-1998 99157T2 Sea Pro, Mariner variants

Technical Specifications

Specification Value
Other Technical Attributes Designed for higher flow rates and cooling flow

Package Contents

  • 1 x Pump Housing Assembly (Replaces 99157A02/99157A1)
  • 1 x Face Plate (Replaces 85083)
  • 1 x Gasket (Replaces 993261)
  • 1 x Water Pump Impeller (Replaces 8508910/47-85089-3/47-85089-10)
  • 1 x Key (Replaces 8M0032838)
  • 1 x Seal (Replaces 85090001/85090)
  • 2 x Washer (transparent)
  • 4 x Grommet
  • 3 x O-ring (Replaces 69202, 35276, 86203)

Explosion Diagram

Installation Guide

  1. Safety First: Disconnect the engine's battery and ensure the engine is securely mounted before starting.
  2. Access the Pump: Remove the lower unit (gearcase) from the outboard's driveshaft housing. This typically involves removing several bolts.
  3. Remove Old Pump: Unscrew the bolts holding the water pump housing in place and slide the entire assembly off the driveshaft.
  4. Clean Surfaces: Thoroughly clean the area, removing any old gasket material or debris from the driveshaft and mating surfaces.
  5. Install New Components: Slide the new gasket and face plate onto the driveshaft. Install the new impeller, making sure to orient the vanes correctly (typically clockwise when viewed from above).
  6. Secure New Housing: Place the new housing over the impeller and press down while turning the driveshaft to seat the impeller. Secure it with the provided bolts and tighten to the manufacturer's torque specifications.
  7. Reassemble: Reinstall the lower unit, ensuring the driveshaft, shift shaft, and water tube are properly aligned. Test the engine using a water source (flusher or test tank) to confirm proper water flow from the tell-tale outlet.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my engine?
A: This kit fits specific Mercury and Mariner models. The most important step is to check your engine's serial number against the ranges listed in the compatibility table. For 9.9 HP and 15 HP BigFoot models, the serial number is the best indicator of fitment.

Q: What are the signs that my water pump is failing?
A: Common symptoms include the engine overheating, a weak or non-existent water stream from the "tell-tale" outlet, or a brittle/cracked impeller found during routine inspection. Timely replacement prevents engine damage.

Q: How often should I replace the water pump impeller?
A: For optimal performance and engine protection, it is recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of use, depending on operating conditions (e.g., saltwater vs. freshwater use).

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: 85357739018

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louctiel
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★★★★★ 4
A Frother that Won't Turn Off? Great Service. Lost Package. Great Hot Chocolate. Worth It!
Color: Black, Size: Z1 Motor + Batteries
I saw this item (or one similar) on an Alton Brown short video. He recommended a frother and I thought "what the heck? If AB recommends a uni-tasker, it must be something good." The item came in, loaded with batteries and all. I removed the plastic tab that interrupts the power and the unit kicked on. I wasn't pressing anything. It just started and would not stop. To return the item is not worth the time or money, especially since none of the "free return" options are anywhere close to me. Called the company and told them what had happened. I spoke with a very nice woman and after I described what happened, her response was not faux sympathy, but "that shouldn't have happened. We'll make it right." She offered not only to replace the unit, but send a second one free of charge. When I declined the second one, she said "take it for your troubles. Give it to a friend if you want." The order was sent out. Tracking via USPS was sent. The package was supposed to be delivered on a Friday, which was great as we were supposed to get cold temps and snow. I was anticipating making frothy hot chocolate. Suddenly the tracking showed the package being delivered. It was not. You cannot ask the USPS to find a package for 7 days and my local post office doesn't answer the phone. Disappointed, I started to make dinner and looked out the window and I could see my postal carrier's truck a block away. I waddled over to the truck and talked to her. She said "I know where it is." She had delivered it 3 blocks away. Same house number, but different street. She went and found the package, brought it to me and Bob's your uncle. That night I made hot chocolate and used the frother. I was surprised that the long shaft did not vibrate or waiver. It stays true. The speed is fast, but not overly so. The thing made a difference. It seemed to make the hot chocolate "lighter" and smoother. I threw a piece of chocolate in the mug, waited a little and then frothed again using the frother. No issues with the frother. I now had frothy, really chocolate-ly hot chocolate. For kicks and on the advice of a friend, I added a tablespoon of peppermint schnapps and used the frother again. Best hot chocolate from a mix I ever had. The frother worked better than advertised. Woo Hoo!! Because the first one didn't work, I have to knock a star off of the rating for the product. But the customer service and actual accountability of the women with whom I spoke is refreshing in the world of product support and customer service. The item is really good and would recommend whole heartedly.
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Reviewed in the United States on January 11, 2026
A
Verified Purchase
Amazon Customer
Carnegie, US
★★★★★ 5
Worth it!
Color: Absolute Black, Size: Z1 Motor + Batteries
It works great! Makes a big difference and my coffee is better! Easy to use and clean. The stand is perfect to keep it accessible. Only thing I would warn customers is to pay attention to instructions on how to insert batteries.
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Reviewed in the United States on May 18, 2026
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Verified Purchase
Matthew Vincent
Waukegan, US
★★★★★ 5
High Quality and Surprisingly Powerful
Color: Absolute Black, Size: Z1 Motor + Batteries
The Pros: Unexpected Power: I usually know exactly what to expect with the products I order, but this unit really blew me away. It is surprisingly powerful and handles everything much better than I anticipated. Premium Batteries Included: It was a great surprise to find that it came with Duracell batteries. Seeing a name-brand battery included really speaks to the overall quality of the product and shows they aren't cutting corners. Solid Build: From the moment I set it up, the unit felt sturdy and well-constructed. It is rare to be this genuinely pleased with a purchase right out of the box. The Cons: Operating Noise: Because the motor is so powerful, it does produce a bit more noise than some weaker units. It isn't a dealbreaker, but it is noticeable during extended use. Bottom Line: This is a high-quality product that exceeded my expectations in both performance and presentation. The fact that it comes ready to go with reliable batteries is a huge plus. I am very pleased with this purchase.
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Reviewed in the United States on May 12, 2026
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SR
Chelsea, US
★★★★★ 5
Pleasantly surprised.
Color: Absolute Black, Size: Z1 Motor + Batteries
Honestly, I bought this because it was on sale and I needed to add something to my cart to get one day free shipping. I had zero expectations and thought I'd use it when I travel and won't have access to my espresso machine but I'm blown away by what it can accomplish in its small form factor. It took 30s to froth the milk and it was well-incorporated into the milk, not with just foam on top and milk at the bottom. I could have the frothed milk all day. It's easier to clean than the steam wand and it does plant-based milk cold foam!! It blows the Ikea one out of the water for about the same price point. Glad I stumbled into it!
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Reviewed in the United States on May 26, 2026
J
Verified Purchase
Jami J. Woodyard
San Leandro, US
★★★★★ 4
Works great for daily use, just be prepared to replace batteries
Color: Absolute Black, Size: Z1 Motor + Batteries
I use this every morning to mix protein powder into my coffee, and it works well. It is quick, easy to use, and does a great job blending everything smoothly without clumps. For the price, it’s a great little tool and has definitely been worth it for daily use. The only downside is that I do have to replace the batteries fairly often, about every 3–4 weeks with regular use. Overall, it’s a very convenient and effective frother, especially for the cost. I would recommend it, just keep extra batteries on hand if you plan to use it daily.
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Reviewed in the United States on June 9, 2026

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