Mercury – Replacement Thermostat | 60 Degree F Cooling Control | Stainless Steel Construction | 8M0119207

Overview

Any boater who’s spent time navigating narrow channels at dawn or easing across a glass-calm lake knows how much trust we put in our engines. When the temperature is right, the motor feels smooth, steady, and responsive—almost as if it’s reading your thoughts. That sense of calm starts with a simple but critical component: the thermostat. The Quicksilver 8M0119207 Replacement Thermostat keeps small Mercury outboards running at the right temperature, giving you that reassuring consistency every time you turn the key.

Whether you’re trolling for hours, hauling gear upriver, or just running the kids out for an afternoon cruise, this thermostat helps your engine stay cool, clean, and efficient so you can enjoy more time on the water with fewer surprises.

Key Features

• Sixty-degree Fahrenheit thermostat designed for select Mercury 8–30 horsepower four-stroke outboards.
• Durable Stainless Steel construction for long service life and corrosion resistance.
• Calibrated for precise cooling system temperature control.
• Self-cleaning design helps flush contaminants from closing surfaces.
• Easy to install using basic hand tools.
• Thermostat only; some applications may require additional seals or gaskets.

Engine & Boat Compatibility

• Fits Mercury 8–9.9 horsepower four-stroke outboards (serial number 0R042475 and higher).
• Works with 15–20 horsepower carbureted four-stroke outboards (serial number 0R235949–0R833819).
• Compatible with Mercury 25–30 horsepower four-stroke EFI outboards, including Jet and SeaPro models.
• A common match for portable fishing boats, aluminum skiffs, inflatable tenders, small pontoons, and light utility craft.

Performance & Practical Benefits

Small engines work hard, especially when they’re pushing a loaded boat in current or running long distances at mid-range throttle. A thermostat that opens at the right moment helps keep internal temperatures in the sweet spot—cool enough to prevent overheating, warm enough to maintain proper fuel atomization and lubrication.

With the 8M0119207 installed, you’ll notice steadier idle performance, smoother transitions when shifting into gear, and more predictable engine behavior during long runs. The Stainless Steel housing resists corrosion far better than cheaper alternatives, giving you a stable, reliable seal season after season. And because the design helps shed debris, the closing surfaces stay clean longer, reducing the chance of sticking or inconsistent operation.

For many owners, the biggest benefit is peace of mind. You’ll know your Mercury Marine part is doing exactly what it was built to do—protect your engine and keep your time on the water simple.

Why Buy OEM

When it comes to engine temperature control, shortcuts only lead to headaches. An OEM thermostat ensures the proper opening temperature, proper fit, and correct long-term performance. You get:

• Genuine Mercury Marine part quality you can trust.
• Better protection against overheating and premature engine wear.
• A straightforward installation with no guesswork.
• Long-term reliability that outperforms most aftermarket options.
• If you want the job done right the first time, OEM is the safest bet.

FAQ

Q1: Which engines does the 8M0119207 thermostat fit?

It fits a range of Mercury four-stroke outboards from 8 to 30 horsepower, including Jet and SeaPro models.

Q2: What sets this thermostat apart from aftermarket versions?

The Stainless Steel construction, precise calibration, and self-cleaning design provide better reliability and longer service life.

Q3: How can I confirm it’s the right thermostat for my motor?

Check your serial number and compare it with your owner’s manual recommendations.

Q4: Can I use this thermostat in saltwater?

Absolutely—its corrosion-resistant construction is designed for both saltwater and freshwater environments.

Q5: Is installation simple?

Most boat owners can replace it with basic tools by following the steps in their service manual.