MERCURY 8M0139434 Motor Thermostat Outboard 9.9 20HP

( Manufacturers Code: Js2793 ), ( Including: Products As Shown In The Picture ), ( Type: Outboard Thermostat Kit ), ( Warranty: 90 Day ), ( Custom Bundle: No ), ( Manufacturer Part Number: 8M0139434 ), ( Motor Engine Type: Mercury 9.9hp 10hp 15hp 20hp 4-stroke Outboards )

Review MERCURY Aftermarket Motor Thermostat Stroke 9.9 20hp Outboard fits MARINER 2010–2015

Introducing the 8M0139434 Motor Thermostat, specifically designed for Mercury Mariner outboard engines with a horsepower range of 9.9 to 20 HP. This thermostat plays a crucial role in maintaining the optimal operating temperature for your engine, ensuring efficient performance and extended service life.

The 8M0139434 Motor Thermostat is a temperature-controlled valve that regulates the flow of coolant between the engine and the cooling system. By allowing coolant to circulate only when the engine reaches a certain temperature, this thermostat prevents the engine from overheating while also conserving engine heat during colder operating conditions.

This thermostat features a durable, heat-resistant construction, making it ideal for the demanding marine environment. The housing is made of high-quality materials that can withstand the effects of saltwater, sunlight, and harsh chemical exposure. The valve mechanism is precision engineered to provide reliable and consistent temperature control, ensuring your engine remains at the optimal operating temperature.

Installing the 8M0139434 Motor Thermostat is a straightforward process. It is designed to fit seamlessly into your Mercury Mariner outboard engine's cooling system, requiring no modifications or additional components. Simply replace the old thermostat with this new one, and your engine will be ready to perform at its best once again.

In summary, the 8M0139434 Motor Thermostat is an essential component of your Mercury Mariner outboard engine's cooling system. It ensures that your engine stays at the optimal operating temperature, providing efficient performance and extended service life. With its durable, heat-resistant construction and precise temperature control, this thermostat is an excellent investment for boat owners seeking reliable and consistent engine performance.

Buying a new motor thermostat for a Mercury Mariner 9.9, 10, 15, or 20hp outboard motor can be an essential investment for maintaining optimal engine performance and preventing potential damage. Here are some pros and cons to consider before making a purchase:

1. Enhanced engine protection: A thermostat helps regulate engine temperature, preventing it from overheating or freezing. This is crucial for prolonging the life of the engine and other components.

2. Improved fuel efficiency: Proper engine temperature regulation can help improve fuel efficiency by ensuring that the engine is operating at its most efficient temperature.

3. Peace of mind: A new thermostat can provide peace of mind, knowing that your engine is being adequately protected from extreme temperatures.

4. Easy installation: Thermostats are typically easy to install, making it a relatively straightforward DIY project.

5. Cost-effective: Compared to other engine repairs, a new thermostat is a relatively affordable investment.

1. Potential for errors during installation: Improper installation of a thermostat can lead to engine damage or reduced performance.

2. Quality concerns: Some aftermarket thermostats may not be of the same quality as OEM parts, potentially leading to premature failure.

3. Availability: Depending on the specific model of your Mercury Mariner outboard motor, finding a compatible thermostat may be challenging.

In conclusion, buying a new motor thermostat for your Mercury Mariner 9.9, 10, 15, or 20hp outboard motor can offer several advantages, including enhanced engine protection, improved fuel efficiency, peace of mind, and easy installation. However, potential cons include the risk of errors during installation, quality concerns with aftermarket parts, and availability.

To ensure a successful purchase, it is recommended to choose a reputable supplier or dealer, follow the installation instructions carefully, and consider investing in a high-quality OEM thermostat for the best results. Ultimately, the decision to buy a new motor thermostat for your Mercury Mariner outboard motor is an investment in the longevity and performance of your engine.

Details:

Thermostat Housing Gasket 27-853702005. Motor Thermostat 8M0139434 For Mercury Mariner 4 Stroke 9.9 10 15 20HP Outboard, Including: products as shown in the picture, This product is Aftermarket, Up for Sale 9.9HP 10HP 15HP 4-Stroke model's Outboards. 1 X Thermostat.

part #: 8m0139434 prices

• $77.99-$78.50

specifications vesselveep:

• for models: Mariner
• for makes: Mercury
• for years: 2010-2015
• manufacturers code: Js2793
• including: Products As Shown In The Picture
• type: Outboard Thermostat Kit
• warranty: 90 Day
• custom bundle: No
• manufacturer part number: 8M0139434
• motor engine type: Mercury 9.9hp 10hp 15hp 20hp 4-stroke Outboards

offer vesselveep:

• quantity: 5
• availability: In Stock
• options: Ship-to-home
• sold: 0
• best offers: True
• started: June 30, 2025

shipping vesselveep:

• class: Standard
• service: USPS First Class
• type: Fixed
• transit: 3-8 Days
• cost: $0.00
• carrier: USPS

general vesselveep:

• Parts Accessories > Boat Parts > Other
• condition: New

payments vesselveep:

• credit card: Mastercard
• wallet: Apple-pay
• other

returns vesselveep:

• paid by: Buyer
• time: 30 Days
• policy: Returns Accepted

seller vesselveep:

• rating: 98.4%
• city: New Jersey
• # reviews: 521

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