SKU: 27508499164

885599003 Thermostat 130°F for Mercury 200HP 225HP 250HP 3.0L DFI EFI | JLM Marine

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Description

885599003 Thermostat 130°F for Mercury 200HP 225HP 250HP 3.0L DFI EFI | JLM MarineThermostat 130F for Mercury 200HP 225HP 250HP 3. 0L DFI EFI This high quality aftermarket thermostat is engineered for Mercury Mariner outboard motors rated 200250 HP with 3. 0L DFI and EFI engines. Designed to maintain optimal operating temperature at 130F, it ensures reliable cooling performance across a wide range of applications from recreational to commercial use. This thermostat directly replaces Mercury OEM part numbers 885599003, 885599004,

Thermostat 130°F for Mercury 200HP 225HP 250HP 3.0L DFI EFI

This high-quality aftermarket thermostat is engineered for Mercury Mariner outboard motors rated 200–250 HP with 3.0L DFI and EFI engines. Designed to maintain optimal operating temperature at 130°F, it ensures reliable cooling performance across a wide range of applications from recreational to commercial use.

This thermostat directly replaces Mercury OEM part numbers 885599003, 885599004, 8855991, and 8M0057307, offering a cost-effective solution without compromising on quality or performance.

  • Maintains precise engine temperature at 130°F for optimal performance
  • Direct-fit replacement for Mercury 3.0L DFI and EFI outboards
  • Compatible with models from 1997 and up

Part Number Cross-Reference

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

Brand Part Number
Mercury 885599003
Mercury 885599004
Mercury 8855991
Mercury 8M0057307

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 Notes
Mercury Mariner 200 3.0L DFI DTS 200 ALL
Mercury Mariner 200 3.0L EFI 200 2003 & Up (OT750164 & Up)
Mercury Mariner 200 DFI 200 1997 & Up (OG386496 & Up)
Mercury Mariner 225 3.0L EFI 225 1999 & Up (OG760300 & Up)
Mercury Mariner 225 3.0L EFI SeaPro 225 2004 & Up (OT801000 & Up)
Mercury Mariner 225 3.0L DFI DTS 225 2003 & Up (OT599000 & Up)
Mercury Mariner 225 DFI 225 1998 & Up (OG590000 & Up)
Mercury Mariner 250 3.0L EFI 250 1999 & Up (OG760300 & Up)
Mercury Mariner 250 Long 3.0L EFI 250 OT861319 & Up

Technical Specifications

Specification Value
Opening Temperature 130°F
Engine Displacement 3.0L
Engine Type DFI / EFI
Horsepower Range 200 HP – 250 HP

Package Contents

Your order includes:

  • 1 × Thermostat (130°F)

Installation Guide

  1. Safety First: Disconnect the battery and allow the engine to cool completely before beginning work.
  2. Drain Coolant: Open the drain valve or remove the lower hose to drain coolant from the system into a suitable container.
  3. Locate Thermostat Housing: Identify the thermostat housing on your engine block, typically near the cylinder head.
  4. Remove Housing Bolts: Using the appropriate socket or wrench, carefully remove the bolts securing the thermostat housing cover.
  5. Extract Old Thermostat: Lift out the old thermostat and inspect the housing for debris or corrosion. Clean thoroughly with a gasket scraper and solvent.
  6. Install New Thermostat: Position the new thermostat in the housing with the temperature-sensing element facing the correct direction (refer to markings or your service manual).
  7. Replace Gasket/Seal: Use a new gasket or O-ring to ensure a proper seal. Apply a thin layer of marine-grade sealant if recommended by the manufacturer.
  8. Reinstall Housing Cover: Carefully align and secure the thermostat housing cover with bolts. Torque to manufacturer specifications in a crisscross pattern.
  9. Refill Coolant: Close drain valves and refill the cooling system with the recommended coolant mixture for your outboard.
  10. Bleed Air: Start the engine and allow it to reach operating temperature, watching for proper coolant circulation and bleeding any trapped air from the system.
  11. Check for Leaks: Inspect all connections and the thermostat housing for leaks. Top off coolant as needed.
  12. Test Run: Run the engine at idle and varying RPMs to confirm stable operating temperature and proper thermostat operation.

Troubleshooting & FAQ

Q: How do I confirm this thermostat fits my engine?
A: Cross-reference your engine's model number and serial number range with the compatibility table above. Verify that your engine is a Mercury 200–250 HP with a 3.0L DFI or EFI configuration and matches the specified serial number ranges.

Q: What are the signs that my thermostat needs replacement?
A: Common symptoms include engine overheating, running too cool (below normal operating temperature), erratic temperature fluctuations, or coolant leaks around the thermostat housing. If your temperature gauge shows abnormal readings, the thermostat may be stuck open or closed.

Q: How often should I replace the thermostat?
A: Thermostats should be inspected annually and replaced every 3–5 years or as needed based on performance. If you notice cooling system issues or during major engine service, replace the thermostat as a preventive measure.

Q: Can I install this thermostat myself, or do I need a mechanic?
A: If you have basic mechanical skills and tools, thermostat replacement is straightforward. However, proper coolant bleeding and torque specifications are critical—professional installation is recommended if you're unfamiliar with marine cooling systems.

Q: Is this an OEM thermostat or 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: 27508499164

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4.2 ★★★★★
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Verified Purchase
Dawn Marx
Cuba, US
★★★★★ 5
It works and fits
Size: 14-22 2.0L hybrid
Worked perfectly.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 30, 2026
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Verified Purchase
Jorge
San Leandro, US
★★★★★ 5
Beautiful
Size: 18-22 1.5L
I love it
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 16, 2026
T
TYH
Los Angeles, US
★★★★★ 5
Great quality Cabin and air filter bundle pack. Very solid quality.
Size: 18-22 1.5L, Size: 18-22 1.5L
First off, I like that it's a combo pack instead of me having to buy each one individually and being able to change both at the same time. Now, I must say the quality of both of them is fantastic; I'm really impressed. It's not made out of cheap junk; it feels solid and seems like it will do a good job filtering out all the debris and dirt. It was extremely easy to install and fit perfectly like an OEM air filter and cabin air filter on my Honda Accord. The cabin air filter is definitely a solid piece, and you don't have to worry about it getting crushed or deforming as it's padded, I would assume the reason for the padding on the side of the cabin air filter is that no debris or dust sneaks through which gives it a snug fit which is very smart honestly. The same applies to the air filter that goes under the hood; it definitely feels like a quality piece. A quality filter definitely keeps outside odors and smells from coming inside the cabin, allowing you to get fresh, clean air when you turn your AC on. Overall, definitely a solid purchase, and I will definitely be back to buy this exact bundle pack in the future as it's well-built and fits like a glove. So, you're definitely getting great value for your money with this specific engine and cabin air filter combo pack. There are a lot of garbage ones out there, so if it were flimsy and felt like a cheap filter, I would be giving this one or two stars. But I'm actually quite impressed with this company, and it seems to be doing a fine job. My AC does work better after installing these new filters, and of course, the car runs better with the air filter installed.
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Reviewed in the United States on April 24, 2026
D
DHK
Battle Creek, US
★★★★★ 5
Good Fit & Quality
Size: 14-22 2.0L hybrid, Size: 14-22 2.0L hybrid
This set which includes both the engine and cabit air filters are of good quality and fits my 2020 Honda Accord Hybrid well. The engine filter feels sturdy and well built. The cabin filter, although without charcoal infusion, has many folds which is more important when it comes to effective filtering of particles. The installation was easy and for the set, this set offers a good value.
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Reviewed in the United States on May 16, 2026
A
ard78641
Carnegie, US
★★★★★ 5
Perfect fit!
Size: 14-22 2.0L hybrid, Size: 14-22 2.0L hybrid
This is a good value for a combo package which includes a cabin air filter as well as the engine air filter. Both filters were a perfect fit in my 2019 Honda Accord hybrid. The cabin air filter airflow direction is clearly labeled and the pleats are sturdy. Installation was super easy- just drop the glove box cover, pop the cabin filter cover plate, pull out the grungy old filter and pop in the new one. Easy peasy. The engine air filter is also a perfect fit. No complaints or concerns here.
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Reviewed in the United States on May 10, 2026

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