Mercury – Quicksilver Thermostat | Cooling System Component | Stainless Steel Construction | 14586

Overview

Engines run best when they stay in their comfort zone — not too hot, not too cold. The Mercury Marine 14586 Quicksilver Thermostat keeps your outboard right in that sweet spot. Built for Mercury TwoStroke and FourStroke outboards, it opens at 120°F, helping your motor warm up quickly and maintain a steady operating temperature. It’s the kind of part that doesn’t draw attention to itself but quietly keeps your engine running smooth, efficient, and protected every time you turn the key.

Key Features

• Purpose: Controls coolant flow to keep the engine at the correct operating temperature.
• Material: Made from marine-grade stainless steel that resists rust and corrosion.
• Temperature Rating: Calibrated to open at 120°F (49°C) for steady cooling system performance.
• Design Detail: Self-cleaning design allows debris to flush through and prevents sticking.
• Performance: Ensures proper warm-up and prevents overheating during heavy use.
• Fitment: Works with Mercury TwoStroke (6–30HP and 65–90HP) and FourStroke (40–60HP) engines.
• Installation: Simple replacement; seals or gaskets may be required depending on the model.

Engine & Boat Compatibility

• 6–30HP TwoStroke and 65–90HP TwoStroke Mercury outboards.
• 40–60HP FourStroke Mercury engines.
• Common on pontoons, runabouts, fishing boats, and small cruisers.
• Built for freshwater and saltwater operation.
• Check your owner’s or service manual for installation specifics.

Performance & Practical Benefits

When the cooling system is working right, you feel it in how the boat runs — smooth idle, quick throttle response, and no heat spikes under load. The 14586 thermostat keeps that balance by regulating coolant flow with precision. It opens at 120°F, holding the engine at its ideal temperature range for clean combustion and longer life.

The stainless-steel build means it won’t rust or seize, even after years in saltwater. Its self-cleaning design helps flush out small particles, so the valve won’t stick open or closed. Once installed, it quietly keeps your motor efficient and your maintenance simple — no surprises, no overheating, just steady, reliable operation.

Why Buy OEM

Thermostats all look similar, but the wrong one can throw off your engine’s performance. The Quicksilver 14586 is a genuine Mercury Marine part, built and tested for your specific outboard. It’s calibrated for the right temperature range and made from materials proven to survive heat, vibration, and salt exposure.

With an OEM thermostat, you get a part that fits perfectly, seals properly, and works exactly as intended. It’s one of those maintenance choices that’s easy to overlook — until you realize how much it protects. Mercury builds it to do one thing: keep your engine in that reliable, steady zone where everything just runs right.

FAQ

Q1: Which Mercury engines use this thermostat?
It fits TwoStroke 6–30HP and 65–90HP, and FourStroke 40–60HP outboards.

Q2: What temperature does it open at?
This thermostat opens at 120°F (49°C) for consistent engine performance.

Q3: Why choose an OEM Mercury thermostat?
It’s built to factory specs for exact temperature control, corrosion resistance, and reliable performance.

Q4: Can it handle saltwater conditions?
Yes. It’s made from stainless steel, designed to withstand salt and moisture without corrosion.

Q5: Is installation complicated?
Not at all — it’s a direct fit that most boaters can replace with basic tools.