SKU: 37174100912

Thermostat Housing Kit – Fits Mercury/Mariner Verado 135-400 HP (Replaces 892864T04, 8M0174561)

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Description

Thermostat Housing Kit – Fits Mercury/Mariner Verado 135-400 HP (Replaces 892864T04, 8M0174561)Thermostat Housing Kit Fits Mercury Mariner Verado 135 400 HP This thermostat housing kit is a direct fit replacement for Mercury and Mariner Verado four stroke outboard engines from 135 HP to 400 HP (2004present). It is engineered to ensure your engine maintains its optimal operating temperature by precisely regulating coolant flow for peak performance and longevity. This assembly directly replaces Mercury part numbers 892864T04 and 8M0174561, along

Thermostat Housing Kit – Fits Mercury/Mariner Verado 135-400 HP

This thermostat housing kit is a direct-fit replacement for Mercury and Mariner Verado four-stroke outboard engines from 135 HP to 400 HP (2004–present). It is engineered to ensure your engine maintains its optimal operating temperature by precisely regulating coolant flow for peak performance and longevity.

This assembly directly replaces Mercury part numbers 892864T04 and 8M0174561, along with Sierra aftermarket parts 18-3631 and 18-3631-K.

  • Includes a pre-seated thermostat for simplified installation.
  • Designed as a direct OEM-spec replacement for a perfect fit.
  • Comes with the required O-ring seal for a leak-free installation.

Part Number Cross-Reference

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

Brand Part Number Superseded By
Mercury 892864T04 8M0174561
Sierra 18-3631 18-3631-K
JLM Marine 18-3631

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 Verado L4 135 4-Stroke 2004–Present 892864T04/8M0174561 4-cylinder models (1B227000-2B576734)
Mercury Verado L4 150 4-Stroke 2004–Present 892864T04/8M0174561 4-cylinder models (1B227000-2B576734)
Mercury Verado L4 175 4-Stroke 2004–Present 892864T04/8M0174561 4-cylinder models (1B227000-2B576734)
Mercury Verado L4 200 4-Stroke 2004–Present 892864T04/8M0174561 4-cylinder models (1B517159-2B576734)
Mercury Verado L6 200 4-Stroke 2004–Present 892864T04/8M0174561 6-cylinder models (0T980000-2B578935)
Mercury Verado L6 Pro 200 4-Stroke 2004–Present 892864T04/8M0174561 Pro 6-cylinder models (2B034840-2B577715)
Mercury Verado L6 225 4-Stroke 2004–Present 892864T04/8M0174561 6-cylinder models (0T980000-2B578935)
Mercury Verado L6 250 4-Stroke 2004–Present 892864T04/8M0174561 6-cylinder models (0T980000-2B578935)
Mercury Verado L6 Pro 250 4-Stroke 2004–Present 892864T04/8M0174561 Pro 6-cylinder models (1B830170-2B577715)
Mercury Verado L6 275 4-Stroke 2004–Present 892864T04/8M0174561 6-cylinder models (0T980000-2B578935)
Mercury Verado L6 300 4-Stroke 2004–Present 892864T04/8M0174561 6-cylinder models (1B517434-2B578935)
Mercury Verado L6 Pro 300 4-Stroke 2004–Present 892864T04/8M0174561 Pro 6-cylinder models (1B830170-2B577715)
Mercury Verado L6 Pro 350 4-Stroke 2015–Present 892864T04/8M0174561 2.6L L6 Pro models (2B141124-3B342962)
Mercury Verado L6 350 4-Stroke 2015–Present 892864T04/8M0174561 2.6L L6 models (2B141617-3B342962)
Mercury Verado L6 400 4-Stroke 2016–Present 892864T04/8M0174561 2.6L L6 models (2B618256-3B342962)
Mercury Racing L6 400R 4-Stroke 2015–Present 892864T04/8M0174561 2.6L L6 Racing models (2B141124-3B342962)

Technical Specifications

Specification Value
Product Type Thermostat Housing Assembly
Installation Direct OEM Replacement
Connection Hose connection with clamp
Housing Material Metal Alloy (Aftermarket)
Operating Temperature 140°F (60°C) nominal opening temperature
Warranty 1-year manufacturer warranty
Other Attributes Includes thermostat pre-seated in housing, O-ring seal required for installation

Package Contents

  • 1 x Thermostat with Housing Assembly (Replaces 892864T04/8M0174561)
  • 1 x O-Ring Seal (Replaces 8M005958)
  • 1 x Clamp (Note: Included with some kits, but may require separate purchase)

Installation Guide

  1. Ensure the engine is completely cool and disconnect the battery.
  2. Drain the engine coolant into a suitable container by opening the drain plug.
  3. Locate the thermostat housing and carefully disconnect the attached coolant hoses.
  4. Unbolt and remove the old thermostat housing assembly. Note the orientation.
  5. Thoroughly clean the mounting surface on the engine block, removing all old gasket or sealant material.
  6. Place the new O-ring seal into its groove on the new housing.
  7. Install the new thermostat housing assembly, ensuring it is correctly seated.
  8. Tighten the mounting bolts to the manufacturer's recommended torque specification.
  9. Reconnect the coolant hoses and secure them with the clamps.
  10. Close the drain plug and refill the cooling system with the appropriate coolant mixture.
  11. Reconnect the battery, start the engine, and let it run for several minutes while checking for any leaks around the housing or hoses.

Troubleshooting & FAQ

Q: How do I confirm this thermostat kit fits my engine?
A: This kit fits a wide range of Mercury Verado L4 and L6 engines from 135 to 400 HP. The best way to confirm is to check your engine's model and serial number against the ranges listed in our "Compatible Engine Models" table above. Cross-referencing your old part number is also a reliable method.

Q: What is the difference between this aftermarket housing and the OEM version?
A: Original Mercury (OEM) housings are typically made from a composite material. Our aftermarket version is constructed from a durable metal alloy for enhanced longevity while maintaining the exact OEM specifications for fit and function.

Q: What are common signs that my thermostat housing is failing?
A: The most common symptoms include the engine overheating (running too hot) or taking too long to reach its normal operating temperature (running too cold). You may also notice visible coolant leaks from cracks in the old housing.

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: 37174100912

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4.3 ★★★★★
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AreTrue
Whiting, US
★★★★★ 4
Smell
Size: Queen (2 Count), Color: Original White (Cooling)
The fact that there are not more comments on the smell of these pillows has me worried about some of yall. Listen, I LOVE the weight, and the firmness, it’s perfect for that. However, these pillows are RANK. They have a very strong mildew-ish smell that lingers. I took the outer cover off and washed it and let the pillow air out for a few days, the smell is still very strong when you press your face against it, which one does because it is in fact designed for that purpose. It smells so bad. It’s nauseating. I can smell it through two pillowcases and blanket that I threw on top of them hoping an extra layer would trap the smell. I’ll bake them in the Texas sun tomorrow and hope that helps, because otherwise these are the perfect pillows for someone who wants to feel like they are hugging a torso but can’t stand the sound/feel of someone else breathing. I don’t know…4 stars, if the smell goes away I’ll come back. Update: many many days later. Either they don’t really smell anymore or I got use to it. They’ve held their firmness and shape well. I like them.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 9, 2026
S
Verified Purchase
Samantha
Boise, US
★★★★★ 5
Actually Cooling Pillow
Size: Queen (1 Count), Color: Original White (Cooling)
This is a really nice pillow, I was worried it would be too soft or too firm but it's just right and it's actually cooling, it feels cool every time I touch it. I've noticed an improvement in sleep since using it. Would recommend!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 27, 2026
T
Verified Purchase
Tyler and Kaela
Draper, US
★★★★★ 5
Repurchased in King Size – Still Love These Cooling Pillows
Size: King (2 Count), Color: Original White (Cooling), Size: King (2 Count), Color: Original White (Cooling)
After using the queen-size version of these pillows for over a year, we purchased the king-size set when we upgraded to a king mattress. Both my husband and I really like them. The cooling feature works well, and we like that each side feels different—when I run cold, I use the softer bamboo side, while my husband prefers the cooler side since he tends to sleep hot. They fit well in our king-size pillowcases and feel supportive in all sleeping positions, whether I’m on my stomach, side, or back. I also appreciate that you can remove some of the filling to adjust the firmness. The covers are washable, which makes them easy to maintain. Overall, we’re very happy with this repurchase and the long-lasting comfort.
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Reviewed in the United States on April 15, 2026
M
Verified Purchase
Mystery Fan
Carnegie, US
★★★★★ 3
Not great at cooling
Size: Queen (2 Count), Color: Original White (Cooling)
Each pillow cover has 2 sides, one marked for cooling, and the other a different fabric. The cooling side is about the same effectiveness as having a silk or satin pillow cover. It's only cool when you first touch it. The cooling side doesn't seem to absorb or wick moisture, so if you are sweaty - it keeps the moisture in place. You'll definitely want a regular pillow case over the pillow cover. In fact, if you suffer from night sweats, the non-cooling side is actually more comfortable. The pillow fill is ample, and simple to squish around for more support for your neck, etc. Think bean bag. But it will retain your impression after use. I find I need to do as I did when I had down pillows - give it a few good shakes in the morning when I make the bed to get it evened out for the coming night. In all, it is a well-made and comfortable pillow to sleep on, but it does not excel in cooling.
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Reviewed in the United States on May 29, 2026
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Verified Purchase
Carol C
Bozeman, US
★★★★★ 5
excellent pillows i bought two sets!!
Size: Firm Queen (2 Count), Color: Original White (Cooling)
I ordered these for my son who has neck issues and has gone through so many pillows trying to find one that he liked. They’re heavy, so i was worried that they might be “too” heavy to be able to sleep on comfortably, so I ordered a second set, one firmer than the other (just in case) and gave him a set for Xmas and he loved the first set so much without even trying the less firm ones.He also needs the cooling factor and these offered that, too. They are filled with pieces of memory foam (tons of it) and each pillow can be modified by removing some of the foam. The covers are beautiful, high quality fabric with a zipper so ts easy to remove or replace the foam pieces. The size is perfect and they keep their shape. I kept the second set i ordered rather than returning them and i love the pillows. I actually modified two by removing some of the foam pieces. I kept the foam pieces in a zippered pillow protector and i can always adjust mine when or if i need to. 1000% love these.
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Reviewed in the United States on March 22, 2026

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