SKU: 11879978876

Outboard Thermostat for Mercury Marine 1.5L 2.5L 75-175 HP DFI Outboard Motors 833072003

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Description

Outboard Thermostat for Mercury Marine 1.5L 2.5L 75-175 HP DFI Outboard Motors 833072003Outboard Thermostat Fits Mercury Marine 75 175 HP DFI (Replaces 833072003) This aftermarket thermostat is engineered to regulate engine temperature for select Mercury Marine, Optimax, and Mercury Mariner outboard motors. It ensures your engine operates within the correct temperature range for optimal performance and longevity. It serves as a direct replacement for Mercury part numbers 833072, 833072002, 833072003, and 833072004, as well as Sierra 18

Outboard Thermostat – Fits Mercury Marine 75-175 HP DFI (Replaces 833072003)

This aftermarket thermostat is engineered to regulate engine temperature for select Mercury Marine, Optimax, and Mercury Mariner outboard motors. It ensures your engine operates within the correct temperature range for optimal performance and longevity.

It serves as a direct replacement for Mercury part numbers 833072, 833072002, 833072003, and 833072004, as well as Sierra 18-3536.

  • Installation Method: Direct Replacement
  • Operating Temperature: 143°F (61.6°C)
  • Important Note: Requires thermostat seal 27-887978, which is not included with this part.

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.
Mercury 1.5L 3-Cyl DFI 75 2-Stroke 2006+ (0T980000-Up) 833072003
Mercury 1.5L 3-Cyl DFI 90 2-Stroke 2004+ (0T801000-Up) 833072003
Mercury 1.5L 3-Cyl DFI 115 2-Stroke 2004+ (0T801000-Up) 833072003
Mercury 2.5L V135 DFI 135 2-Stroke 1998+ (0G590000-Up) 833072003
Mercury 2.5L V150 DFI 150 2-Stroke 1998+ (0G590000-Up) 833072003
Mercury 2.5L V175 DFI 175 2-Stroke 2001+ (0T178500-Up) 833072003
Mercury Optimax 135-200 2-Stroke 1998+ 833072003
Mercury Mariner Carbureted 225, 250, 300 2-Stroke 833072003

Technical Specifications

Specification Value
Product Type Engine Thermostat
Installation Direct Replacement
Housing Color Silver/Metallic
Operating Temperature 143°F (61.6°C)
Other Technical Attributes Requires thermostat seal 27-887978 (not included)

Package Contents

  • 1 x Mercury Outboard Thermostat (Replaces 833072/833072002/833072003/833072004)
  • Note: Thermostat seal (part number 27-887978) is required for installation and is not included.

Installation Guide

  1. Disconnect Battery: Disconnect the negative battery cable to prevent electrical shorts.
  2. Drain Coolant: Drain the engine's cooling system to a level below the thermostat housing.
  3. Locate Housing: Identify and access the thermostat housing on the engine block.
  4. Remove Housing: Carefully unbolt and remove the thermostat housing cover.
  5. Remove Old Thermostat: Take out the old thermostat and the corresponding seal or gasket.
  6. Clean Surfaces: Thoroughly clean the mating surfaces of the housing and engine block.
  7. Install New Thermostat: Insert the new thermostat, ensuring it is correctly oriented. Install the new seal (sold separately).
  8. Re-install Housing: Secure the housing cover and tighten the bolts to the manufacturer's recommended torque.
  9. Refill Coolant: Refill the cooling system with the appropriate coolant.
  10. Check for Leaks: Reconnect the battery, start the engine, and carefully inspect for any leaks around the housing as the engine warms up.

Troubleshooting & FAQ

Q: How do I confirm this thermostat fits my engine?

A: First, review the "Compatible Engine Models" table. For Mercury owners, we highly recommend using the linked guides to verify your engine's serial number and model against the listed applications. This part is specifically for certain Mercury 1.5L and 2.5L DFI engines.

Q: What are the common signs of a failing thermostat?

A: A faulty thermostat can cause your engine to overheat, fail to reach its normal operating temperature, or show erratic temperature gauge readings. Replacing it can restore proper engine temperature regulation.

Q: Is the necessary seal included with this thermostat?

A: No. The required thermostat seal (Mercury part 27-887978) is not included in this package and must be acquired separately to ensure a proper, leak-free installation.

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: 11879978876

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4.0 ★★★★★
Based on 26 reviews
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J
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JB
Lexington, US
★★★★★ 1
Not for tough chewers at all!!!
Size: 10.5 inch Rubber Flex Tread, Size: 10.5 inch Rubber Flex Tread
5 minutes in and it's destroyed. Very disappointing.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 21, 2026
N
Verified Purchase
Nicky S
Omaha, US
★★★★★ 5
Great chew toy
Size: 10.5 inch Rubber Flex Tread
This is my second time buying the Tonka rings. My dog loves this chew toy. It does take him a bit to destroy them. I give this toy to him as a reward otherwise it be destroyed in 3 days. I have a pitty. So other dogs it should last longer. They are shin whackers and hurt when they connect. So I make sure to watch the dog and toy around small kids and elderly to be safe. They are heavy and made well.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 29, 2025
A
Verified Purchase
Ann
Lexington, US
★★★★★ 5
Finally a toy we can leave out!
Size: 10.5 inch Rubber Flex Tread, Size: 10.5 inch Rubber Flex Tread
There are very few toys that we can leave out for our 11 month old golden. Which is a shame because as a small puppy, we taught him to bring us a toy to initiate play instead of nipping. Ropes or stuffies never lasted more than a few minutes so they always had to be taken away. One time he brought us a benenbone to play tug. So I tried this as a last resort. Finally something we can keep out for him! It’s not completely indestructible. He has figured out how to pull bits of tread off. But he chewed hard on it for a solid 20 minutes and it’s still intact with the exception of a few small tread pieces. Can’t say that for 99% of the other dog toys on the market! UPDATE: OK, so it's definitely not indestructible. After a few days of dedicated gnawing, he has almost chewed through the yellow ring so we can't leave him too unsupervised with it. I'm still going to leave it as 5 stars since it's the best tug toy that I have found so far and we have tried a lot! I may buy another one and just make sure I don't let him freely chew on it for any length of time.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 1, 2023
E
Verified Purchase
eave4sean
Lexington, US
★★★★★ 3
Really wanted this toy to be better...
Size: 10.5 inch Rubber Flex Tread
I got this toy because I have 3 large dogs that all like to pull things. I can't always play with them even though they follow me everywhere wanting to play, so I saw this toy and thought it would be good because it would give them something they can tug away at with each other. I saw the thick rubber and thought it would last awhile, but I was wrong. My German Shepherd and Pyrenees mix chewed though the first tire rather quick, and before I realized, I was finding chunks of tire around the house and yard. Thankfully, none of them tried to eat it. It seems like it could be a good toy for an aggressive chewer IF they are smaller and not as strong as these large dogs are, but it did not hold up long to mine.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 23, 2024
C
Verified Purchase
Craig Curran
Alexandria, US
★★★★★ 5
Longest living toy ever!
Style: Variety Pack - Large (3-pack), Style: Variety Pack - Large (3-pack)
This review is 2 years in the making! Purchased over 2 years ago, all three are still in active play, still squeek, with no holes.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 18, 2026

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