SKU: 93486189271

8M0251126 Maintenance Kit for Mercury 40HP 50HP 3 Cylinder | JLM Marine

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Description

8M0251126 Maintenance Kit for Mercury 40HP 50HP 3 Cylinder | JLM Marine8M0251126 Maintenance Kit for Mercury 40HP 50HP 3 Cylinder JLM Marine This comprehensive maintenance kit is engineered for Mercury 40 50HP 3 cylinder outboard engines manufactured between 1994 and 2011 (serial number range 0G590000 to 2B999999). It consolidates essential service componentsincluding water pump parts, thermostats, fuel filters, and lubrication accessoriesinto one package to simplify routine maintenance and extend engine life. OEM Part

8M0251126 Maintenance Kit for Mercury 40HP 50HP 3 Cylinder | JLM Marine

This comprehensive maintenance kit is engineered for Mercury 40-50HP 3-cylinder outboard engines manufactured between 1994 and 2011 (serial number range 0G590000 to 2B999999). It consolidates essential service components—including water pump parts, thermostats, fuel filters, and lubrication accessories—into one package to simplify routine maintenance and extend engine life.

OEM Part Number: 8M0251126. This aftermarket kit delivers direct-fit replacement components that meet or exceed original equipment specifications, providing a cost-effective solution for scheduled service intervals.

  • Complete cooling system refresh: impeller, gaskets, thermostat, and water tubes
  • Includes fuel filter and gear oil pump for comprehensive drivetrain maintenance
  • All components designed for precise fit on USA-model Mercury 3-cylinder engines

Part Number Cross-Reference

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

Brand Part Number
Mercury 8M0251126

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 Cylinder Years Serial Number Range
Mercury USA Model 40-50HP 3 Cylinder 1994-2011 0G590000 to 2B999999

Technical Specifications

Specification Value
OEM Part Number 8M0251126
Brand Compatibility Mercury
Engine Power 40-50HP
Cylinder Configuration 3 Cylinder
Model Year Range 1994-2011
Serial Number Range 0G590000 to 2B999999
Application USA Model

Package Contents

This maintenance kit includes the following components:

  • 47-85089-10 Water Pump Impeller × 1
  • 8M0032838 / 85119 Impeller Key × 1
  • 821354-2 Wear Plate × 1
  • 27-822189 Gasket × 1
  • 27-822217 Gasket × 1
  • 12-86645-1 Washer × 2
  • 823547 1 Water Tube × 1
  • 43023 Water Tube × 1
  • 850055001 Thermostat × 1
  • 27-827284 Thermostat Gasket × 1
  • 35-877565T1 Fuel Filter × 1
  • 12-191833 Drain Screw Gasket × 3
  • 27-828816 Oil Drain Screw Gasket × 1
  • 24OP149 Gear Oil Pump × 1

Important: Verify all components match your engine's service manual specifications before installation.

Installation Guide

  1. Preparation: Disconnect the battery and ensure the engine is cool. Gather necessary tools including screwdrivers, wrenches, and a torque wrench.
  2. Access the Lower Unit: Remove the propeller and drain the gear oil using the drain screws. Replace drain screw gaskets (12-191833) during reassembly.
  3. Remove Water Pump Housing: Unbolt the water pump housing from the lower unit. Carefully separate it to expose the old impeller and wear plate.
  4. Replace Impeller & Wear Plate: Remove the old impeller (47-85089-10) and impeller key (8M0032838). Install the new wear plate (821354-2), then insert the new impeller with key aligned.
  5. Install Gaskets: Replace all pump housing gaskets (27-822189, 27-822217) with new ones. Ensure mating surfaces are clean and free of old gasket material.
  6. Replace Water Tubes: Install new water tubes (823547 1 and 43023) into their respective ports. Verify secure seating to prevent coolant leaks.
  7. Thermostat Replacement: Locate the thermostat housing on the cylinder head. Remove the old thermostat (850055001) and gasket (27-827284), then install new components.
  8. Fuel Filter Service: Replace the inline fuel filter (35-877565T1) in the fuel line. Ensure fuel flow direction matches the arrow on the filter housing.
  9. Reassemble Water Pump: Torque all water pump housing bolts to manufacturer specifications. Install washers (12-86645-1) as directed in your service manual.
  10. Refill Gear Oil: Use the included gear oil pump (24OP149) to refill the lower unit through the bottom drain hole. Fill until oil appears at the upper vent hole, then replace both drain plugs with new oil drain screw gasket (27-828816).
  11. Final Checks: Reinstall the propeller and reconnect the battery. Run the engine in a test tank or on-water to verify proper cooling system operation and check for leaks.
  12. Documentation: Record the service date and hours in your maintenance log. Dispose of used oil and filters according to local regulations.

Troubleshooting & FAQ

How do I confirm this kit fits my Mercury engine?
Verify your engine's serial number falls within the range 0G590000 to 2B999999 and that it is a USA-model 40-50HP 3-cylinder outboard manufactured between 1994 and 2011. Cross-reference with your owner's manual or use the Mercury serial number guide linked above.

How often should I replace the water pump impeller?
Mercury recommends replacing the water pump impeller every 2-3 years or 200-300 hours of operation, whichever comes first. Engines operated in sandy or silty water may require more frequent service.

What are the signs that my cooling system needs service?
Watch for reduced water stream from the telltale (pee hole), engine overheating alarms, steam from the engine, or poor performance. These symptoms often indicate impeller failure or thermostat issues.

Can I reuse the old gaskets if they look intact?
No, always replace all gaskets during service even if they appear undamaged. Used gaskets compress and lose their sealing ability, which can lead to coolant leaks and overheating.

What's the difference between this kit and the OEM Mercury kit?
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: 93486189271

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Robin J
Phoenix, US
★★★★★ 5
Terrific product
Color: A1-Red
I adopted a 2 year old cat - she’s not much for a lot of the toys I have purchased for her, until this one! At first she seemed very cautious with it - but still followed it around - once I slowed it down (a few different options) she loves to play with it! Great purchase very pleased with it
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Reviewed in the United States on March 6, 2026
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Shayla Shepherd
Fort Morgan, US
★★★★★ 5
Fun & Fast moving toy for my cats!
Color: A1-Red
This is such a fun little toy to keep my cats entertained. They were definitely weary about it for the first few days, but started to get used to it and play with it after a bit. I wish there was an even slower option because the slow option is still pretty fast, but at least it gets them up and moving. They will even play with the tail part when it's not turned on. Like others have said, it does collect hair pretty easily, but it's very easy to clean off. I don't have any dogs, but I could see smaller dogs loving this as well!
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Reviewed in the United States on March 6, 2026
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Jacqueline M. Miller
Fort Morgan, US
★★★★★ 2
That it’s usable for more than one day
Color: A3-Pink, Color: A3-Pink
The toy itself is great and my puppy enjoyed it. My problem is that it didn’t come with a charging cord and none of mine fit. It never changed colors. Maybe if I had a charger cord it would be worth it, but right now it’s useless!!
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Reviewed in the United States on May 13, 2026
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Tinkerbell
Port Orchard, US
★★★★★ 3
Fun for Fido but flimsy
Color: A2-Blue
My 15 yearold mini Schnauzer, Sam, played with this for less than 1 hour and tore the rubber sleeve off it. I will say the toy itself is a genius idea. Sam was absolutely ensconced. I wish it were made sturdier.
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Reviewed in the United States on January 24, 2026
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sheila b.
Louisville, US
★★★★★ 4
It does exactly what they say it does! Worth the money
Color: A1-Red
It arrived quickly. It’s a fun toy! It’s the right size for cats. Definitely worth the money. It is exactly as described. So far, the quality seems very good and it seems durable. The instructions are on the side of the box, which makes learning how to operate it easy. I love it that it’s red, because my kitty seems to be attracted to red. My kitty is very interested in it, yet isn’t quite sure what to think of it. I love that it changes directions on its own so that it doesn’t get stuck or lost under furniture, which is typical for a ball that cats play with. It seems to only go two, three or four feet in one direction and then it changes directions, which is both good and bad. I just wish it would go farther in one direction before changing directions so that my kitty could chase it farther, as we have plenty of space in our house for her to run. But that certainly could be a plus for other cats, enjoying not knowing where the ball is going to go next and really keep them on their toes.
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Reviewed in the United States on January 20, 2026

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