Thermostat Kit – Fits Mercury/Mariner 75-150 HP 4-Stroke EFI Outboards

Vendor: JLM Marine
Availability: In Stock
Product Type: Thermostat
$32.49
$32.49
Subtotal: $32.49

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Thermostat Kit – Fits Mercury/Mariner 75 - 150 HP 4 - Stroke EFI Outboards - JLM Marine Boat Parts Limited

Thermostat Kit – Fits Mercury/Mariner 75-150 HP 4-Stroke EFI Outboards

$32.49

Thermostat Kit – Fits Mercury/Mariner 75-150 HP 4-Stroke EFI Outboards

$32.49

Thermostat Kit – Fits Mercury/Mariner 75-150 HP 4-Stroke EFI Outboards (Replaces 892864T06, 892864A06)

This thermostat kit is a direct-fit replacement for Mercury/Mariner 75-150 HP 4-Stroke EFI outboards (2001-2014). It is designed for models with serial numbers 1B366823-2B094995 (75-115 HP) and 1B905505 & Up (150 HP).

This assembly replaces Mercury part numbers 892864T06, 8M0090819, and 892864A06, as well as Sierra part number 18-3635-K. It provides a reliable solution for maintaining optimal engine operating temperature.

  • Includes the complete assembly with housing, thermostat, O-ring, and clamp.
  • Engineered for a direct-fit OEM replacement installation.
  • Rated for a 48.8°C/50°C (120°F) operating temperature.

Part Number Cross-Reference

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

Brand Part Number Superseded By
Mercury 892864T06 8M0090819
Mercury 892864A06
JLM Marine AM892864T06
Sierra 18-3635-K

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 EFI 75 4-Stroke 2001-2009 892864T06 Serial range: 1B366823-2B094995
Mercury EFI 80 4-Stroke 2001-2009 892864T06 Serial range: 0P459572-2B094995, 1B366823-2B094995
Mercury EFI 90 4-Stroke 2001-2009 892864T06 Serial range: 1B366823-2B094995
Mercury EFI 100 4-Stroke 2001-2009 892864T06 Serial range: 0P459572-2B094995, 1B366823-2B094995
Mercury EFI 115 4-Stroke 2001-2009 892864T06 Serial range: 1B366823-2B094995
Mercury EFI 150 4-Stroke 2001-2014 892864T06 Serial range: 1B905505 & Up

Technical Specifications

Specification Value
Product Type Thermostat Kit with Housing Assembly
Installation Direct-fit OEM replacement
Fuel Type Gasoline
Housing Material Marine-grade metal alloy
Dimensions Approximately 100 mm × 90 mm × 150 mm [verify orientation]
Operating Temperature 48.8°C/50°C (120°F) rated temperature
Warranty Varies by manufacturer (typically 1 year)
Other Technical Attributes Complete assembly with housing, thermostat, O-ring and clamp

Package Contents

  • 1 x Thermostat Assembly with Housing (892864T06/8M0090819)
  • 1 x O-ring Seal (8M005958)
  • 1 x Clamp (888988008)

Installation Guide

  1. Safety First: Ensure the engine is off and cool. Disconnect the battery cables.
  2. Drain Coolant: Place a container under the engine and drain the cooling system to a level below the thermostat housing.
  3. Locate Housing: Identify the thermostat housing on the engine block.
  4. Remove Old Assembly: Loosen the clamp and detach the hose. Remove the bolts securing the housing and carefully lift it away.
  5. Clean Surface: Thoroughly clean the mating surface on the engine block, removing any old gasket or sealant residue.
  6. Install New Thermostat: Place the new thermostat into the housing, ensuring it is correctly oriented. Install the new O-ring seal.
  7. Reassemble: Mount the new housing assembly onto the engine block and tighten the bolts to the manufacturer's specified torque.
  8. Reconnect Hose: Reattach the coolant hose and secure it with the new clamp.
  9. Refill & Check: Refill the cooling system with the appropriate coolant. Start the engine and carefully check for any leaks around the housing.
  10. Final Test: Allow the engine to reach operating temperature, monitoring the temperature gauge to ensure it is stable and within the correct range.

Troubleshooting & FAQ

How do I confirm this fits my engine?

Check the compatible models table and verify your engine's serial number falls within the specified range for your model, year, and horsepower. Cross-referencing the part number (892864T06) with your service manual is also recommended.

What temperature does this thermostat operate at?

This thermostat is rated for 48.8°C/50°C (120°F) to ensure your engine maintains its optimal operating temperature for performance and efficiency.

What are common signs of a failing thermostat?

Signs of a faulty thermostat include engine overheating, the engine not reaching normal operating temperature (running too cool), erratic temperature gauge readings, poor engine performance, or increased fuel consumption.

Is this a complete kit for installation?

Yes, this is a complete kit that includes the thermostat, the housing assembly, the required O-ring seal, and the clamp, providing all the necessary components for a standard replacement.

OEM vs. Aftermarket?

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.

We can ship to virtually any address in the world with free shipping available for most regions.

For our typical US and Canadian customers , our shipping timeframes are as follows:

  • Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
  • US warehouse shipment: orders will be delivered within 5 days after placing the order.
  • China warehouse shipment: orders will be delivered about 12 days after placing the order.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.

As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.

We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.

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