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Description
Thermostat Kit – Fits Mercury Verado V6/V8 175-300HP (Replaces 8M0162139, 8M0137816)Thermostat Kit Fits Mercury Verado V6 V8 175 300HP (Replaces 8M0162139, 8M0137816) This thermostat kit is designed for Mercury Mariner Verado 175 300HP V6 3. 4L & V8 4. 6L 4 Stroke engines from 2018 and newer (serial number 2B529482 and above). It is a direct replacement for Mercury OEM part numbers 8M0137816 and 8M0162139. Engineered for direct fit installation, matching OEM specifications. Features a corrosion resistant stainless steel housing for
Thermostat Kit – Fits Mercury Verado V6/V8 175-300HP (Replaces 8M0162139, 8M0137816)
This thermostat kit is designed for Mercury/Mariner Verado 175-300HP V6 3.4L & V8 4.6L 4-Stroke engines from 2018 and newer (serial number 2B529482 and above).
It is a direct replacement for Mercury OEM part numbers 8M0137816 and 8M0162139.
- Engineered for direct-fit installation, matching OEM specifications.
- Features a corrosion-resistant stainless steel housing for durability in marine environments.
- Designed with a self-cleaning mechanism that allows contaminants to be flushed from closing surfaces.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number | Superseded By |
|---|---|---|
| Mercury | 8M0137816 | 8M0162139 |
| Mercury | 8M0162139 |
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 3.4L V6 | 175 | 4-Stroke | 2018–Present | 8M0162139 | S/N: 2B529482 and above |
| Mercury | Verado 3.4L V6 Pro XS | 175 | 4-Stroke | 2018–Present | 8M0162139 | S/N: 2B529482 and above |
| Mercury | Verado 3.4L V6 | 200 | 4-Stroke | 2018–Present | 8M0162139 | S/N: 2B529482 and above |
| Mercury | Verado 3.4L V6 SeaPro | 200 | 4-Stroke | 2018–Present | 8M0162139 | S/N: 2B529482 and above |
| Mercury | Verado 4.6L V8 Pro XS | 200 | 4-Stroke | 2018–Present | 8M0162139 | S/N: 2B529482 and above |
| Mercury | APEX | 200 | 4-Stroke | 2023–Present | 8M0162139 | S/N: 1E054353 and above |
| Mercury | Verado 3.4L V6 | 225 | 4-Stroke | 2018–Present | 8M0162139 | S/N: 2B529482 and above |
| Mercury | Verado 4.6L V8 Pro XS | 225 | 4-Stroke | 2018–Present | 8M0162139 | S/N: 2B529482 and above |
| Mercury | Verado 4.6L V8 SeaPro | 225 | 4-Stroke | 2018–Present | 8M0162139 | S/N: 2B529482 and above |
| Mercury | Verado 4.6L V8 | 250 | 4-Stroke | 2018–Present | 8M0162139 | S/N: 2B529482 and above |
| Mercury | Verado 4.6L V8 Pro XS | 250 | 4-Stroke | 2018–Present | 8M0162139 | S/N: 2B529482 and above |
| Mercury | Verado 4.6L V8 SeaPro | 250 | 4-Stroke | 2018–Present | 8M0162139 | S/N: 2B529482 and above |
| Mercury | Verado 4.6L V8 Verado | 250 | 4-Stroke | 2018–Present | 8M0162139 | S/N: 2B529482 and above |
| Mercury | 4.6L V8 Racing | 250R | 4-Stroke | 2021–Present | 8M0162139 | S/N: 1E080500 and above |
| Mercury | Verado 4.6L V8 | 300 | 4-Stroke | 2018–Present | 8M0162139 | S/N: 2B529482 and above |
| Mercury | Verado 4.6L V8 Pro XS | 300 | 4-Stroke | 2018–Present | 8M0162139 | S/N: 2B529482 and above |
| Mercury | Verado 4.6L V8 SeaPro | 300 | 4-Stroke | 2018–Present | 8M0162139 | S/N: 2B529482 and above |
| Mercury | Verado 4.6L V8 Verado | 300 | 4-Stroke | 2018–Present | 8M0162139 | S/N: 2B529482 and above |
| Mercury | Verado 4.6L V8 Verado SeaPro | 300 | 4-Stroke | 2018–Present | 8M0162139 | S/N: 2B529482 and above |
| Mercury | 4.6L V8 Racing | 300R | 4-Stroke | 2021–Present | 8M0162139 | S/N: 1E080500 and above |
| Mercury | 4.6L V8 AMS Racing | 300R | 4-Stroke | 2021–Present | 8M0162139 | S/N: 1E081459 and above |
| Mercury | APEX | 360 | 4-Stroke | 2023–Present | 8M0162139 | S/N: 1E054247 and above |
| Mercury | Racing | 450R | 4-Stroke | 2020–2023 | 8M0162139 | S/N: 1E083006-1E099720 |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Thermostat |
| Installation | Direct replacement |
| Housing Material | Corrosion-resistant stainless steel |
| Temperature Rating | 140°F (60°C) |
| Other Technical Attributes | Self-cleaning design allows cooling system contaminants to flush through closing surfaces |
| Warranty | OEM factory warranty when purchased from authorized dealer |
Package Contents
- 1 x Thermostat (8M0162139)
Installation Guide
- Ensure the engine is cool and disconnect the battery. Place a container under the engine to catch draining coolant.
- Locate the thermostat housing on the engine block. It's typically where the main coolant hose from the radiator attaches.
- Carefully remove the bolts securing the housing. You may need to gently tap the housing to break the seal.
- Note the orientation of the old thermostat before removing it from the housing.
- Clean both the housing and the engine block mating surfaces thoroughly, removing all old gasket material.
- Install the new thermostat in the same orientation as the original.
- Re-secure the thermostat housing with a new gasket, if applicable, and tighten the bolts to the manufacturer's specified torque.
- Reconnect all hoses, refill the cooling system with the appropriate coolant, and reconnect the battery.
- Start the engine and let it warm up, checking carefully for any leaks around the thermostat housing. Top off the coolant as needed.
Troubleshooting & FAQ
Q: How do I confirm this thermostat fits my Verado engine?
A: This thermostat fits a wide range of Mercury Verado V6 and V8 engines (2018 and newer). The most reliable way to confirm fitment is to match your engine's serial number against the ranges listed in the compatibility table. For this part, your serial number should be 2B529482 or higher for most models.
Q: What are the signs of a failing thermostat?
A: Common symptoms include engine overheating (if stuck closed) or the engine taking too long to reach its proper operating temperature (if stuck open). An erratic temperature gauge reading can also indicate a problem.
Q: How often should I replace my engine's thermostat?
A: Thermostats don't have a fixed replacement schedule, but they are a critical component for engine health. Many mechanics recommend replacing them as a preventative measure every 300-500 hours or every few years, especially if you operate in saltwater.
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:
- 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
4.3 ★★★★★
Based on 7 reviews
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Product Reviews
★★★★★ 5
Lasted a year with a Great Dane
Size: Large, Color: Red, Size: Large, Color: Red
It lasted an entire year as my Great Dane’s favorite squeaky ball. The only reason it’s failing is because the squeaker no longer works great.
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Reviewed in the United States on May 31, 2026
★★★★★ 3
Not indestructible but pretty darn tuff for sure!
Size: Large, Color: Blue
I would have maybe given a better rating if they hadn’t lied about it being indestructible and recommended it for my dogs size range! It didn’t last the first day. However my dog may be a bit above average when it comes to his relationship with the balls! It’s an issue and he should probably be in a 12 step program of some kind. But we all have our vices right and his is balls. All of them he needs em and he never stops joining for them and the stronger they are the more he’s driven to defeat it! So now that you have full disclosure from me. The ball is still in his box and it’s still round and mostly intact and that’s after several months! The part that didn’t last the first day was the squeaker! Poor little dude! If he would have just stayed quite it. But he didn’t and Bo dog knew he was in there! And made short work of him. Other than that. The ball pretty dang tough! But it’s not indestructible is it a big deal. Well in this world of way to many choices and then having to find the few that will tell you honestly what your getting and are not over stating their product! Just to get your money. And couldn’t care less about the quality! It sucks that we have to navigate all the crap to find the few decent things available. So it most certainly does matter! And I say that for their benefit the most hopefully! Because people are craving and constantly looking for a company that just makes the effort to put out the best they can. And tell you the honest description of what they have. That stands behind their work and puts more effort into quality then they do into profit. With the faith that the quality and integrity in their company will end up bring them the profits they can be proud of and know that they earned! Honestly! Is this company one of those! I don’t know? It’s not clear and in their defense I never reported the sneaky man’s demise on day one! I expected that. But indestructible is a descriptive word that has a very specific meaning. And when it’s used in a manner that it was! Then you’ve set yourself up to fail as there are very few things that meet that description! And I know I’m picking hairs here. But it’s words that get used like that wich makes one appear to have not met the standard they wanted to! And maybe you don’t realize its impact on your overall until it’s far down the road! Can it be said better. Sure . Always room for improvement. But I would certainly remove the claim that’s just unreasonable to expect. If I wanted to use the benifit the does have to offer perhaps I would have said this ball is the closest thing to indestructible we’ve made so far. That’s statement tell me that they are not claiming it is but that it’s pretty tough! And it with out exact words tells you these guys must take honesty seriously or they wouldn’t have chosen to claim the accurate step below. And that lets me know that they hold themselves to a standard that they obviously respect their customers and they don’t take them for granted that’s integrity right there and there’s just not enough of it o. This world today! Seems to me that there are a few that are really close to it though. Maybe so close it’s worth the time to just go ahead and say it. If my gut feeling is right then it’s absolutely worth the time! Do I recommend the item absolutely it’s as tough as nails! And if you hate the squeaky part. Then don’t worry it won’t last long if your dogs like mine. Or you can take the little dude out when the dogs sleeping! And I’m going to add a star because when I look at it in the wider view I’ve been a bit harder then is justified I believe. Their. Our lives today are not as good as they once were and should be! Because of our bad habit of not holding ourselves to the standards we are capable of and rather settling for what’s out there at the time. Because of many reasons right. What’s the point. Or it’s not going to change a thing. Or that as good as it needs to be. Don’t want to seem so picky and all the justification we inject in the place of our potential. That’s had a vey negative effect across the board! And we’re losing so much more then quality dog toys as a result. When we let or standards drop due to whatever reasons as a civilization then are standards drop. And that’s all you should need to know. To understand where that leads! And we only do ourselves the disservice and loss that comes from those choices. So look around and don’t hesitate to. All out that when you see it. Just try and come from a place that’s not to tear things down but to remind them of what they are really capable of! And how much we all need to hold ourselves to the highest standard we are capable of! And stop justifying excepting less! And then we see the results from that rather than the other.
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Reviewed in the United States on August 18, 2025
★★★★★ 5
MUST BUY! For large Dogs Safe & Fun! 100lb Dutch shepherd loves this
Size: Large, Color: Blue, Size: Large, Color: Blue
I have 100 pound Dutch Shepherd who likes to chew and he goes through toys pretty quickly. This one he has been chewing on for hours and has not made a dent, not one!! he loves it. He bounces it. It’s very bouncy. I love that about it the engagement with it is great! noise level. It makes some noise. I’ve got wood floors so you can hear it bouncing and the squeak is pretty loud, which is fine with me. It doesn’t bother me. My pet really really enjoys this a lot. I think this is an amazing value for the money because I’ve spent more money on other toys and they fell apart within a day. I think it’s a safe toy because he’s not got a little hard plastic pieces that are coming off of it. It does not break apart very easily and the size is good. it fits in the palm of my hand so it’s pretty good size ball for him. It’s big enough. He cannot swallow it, but he can fit it in his mouth. I think the thing that I like the most about it and he enjoys is that when he drops it, it bounces and he can chase it. Pet enjoyment 10 out of 10 engagement 10 out of 10. I feel it’s very safe dog friendly absolutely must buy hands-down. You will not be disappointed. It’s made of a very strong. I would say rubber and it’s super easy to clean. Just toss it in the sink. Wash it off with soap and water rinse it. It’s good to go. I’m running to buy another one right now as we speak so just in case he loses it, he’ll have a backup.
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Reviewed in the United States on May 27, 2026
★★★★★ 5
Great, solid toy safe for my dog
Size: Large, Color: Blue, Size: Large, Color: Blue
This ball is great! My pit bull love toys, especially ones with squeakers, but she’s a power chewer and trashes them almost immediately. Since she’s got a history of swallowing foreign bodies, this means she’s rarely been able to have toys, and when she does get them, it’s short lived. She LOVES this ball and it’s already lasted multiple weeks with no signs of any damage, despite the fact she carries it everywhere and chews on it daily. We don’t have to worry about her safety with this toy, because it’s large and tough enough she can’t swallow anything. It hasn’t lost its squeak either despite all her tough love. She loves to play with it and we’re getting more of them asap so she has a backup if this one gets lost or eventually does break.
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Reviewed in the United States on May 2, 2026
★★★★★ 5
Truly indestructible
Size: Large, Color: Blue
They are not kidding, this ball is truly indestructible. I've gotten several for my dogs so they have plenty to share. Two of my dogs are beyond super chewers (bully breeds). One of the balls is missing the section that's glued into most of them, but the structure has still held up. And my dogs LOVE them.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 31, 2026