Mercury – Quicksilver Thermostat Kit | Cooling System Component | V6 135–200HP Outboards | 75692Q2

Overview

Your outboard runs best when it’s kept at just the right temperature. The Mercury Marine 75692Q2 Quicksilver Thermostat Kit helps maintain that balance, keeping your Mercury and Mariner V6 135–200HP outboards running cool, efficient, and dependable. Designed for select serial ranges, this OEM kit includes two thermostats and two rubber gaskets for a complete replacement. Each thermostat is built to Mercury’s factory standards, opening at the precise temperature your engine needs for clean running and long-term reliability.

Key Features

• Purpose: Controls cooling flow to maintain consistent engine temperature and prevent overheating.
• Contents: Includes two thermostats and two rubber gaskets for a full replacement.
• Material: Made from marine-grade corrosion-resistant metals and rubber for long service life.
• Performance: Ensures proper temperature regulation for optimal fuel efficiency and power.
• Durability: Resists scaling, heat, and vibration under real marine operating conditions.
• Ease of Service: Installs easily using standard hand tools; follow your service manual for specs.

Engine & Boat Compatibility

• Mercury / Mariner V6 outboards
• 135–150HP (serial No. A9046446 and higher)
• 175HP (serial No. C100861 and higher)
• 200HP (serial No. 6435503 and higher)

Performance & Real-World Benefits

The 75692Q2 thermostat kit restores your outboard’s ability to maintain a steady operating temperature. Consistent cooling means better combustion, fuel economy, and smoother performance — especially on long runs. Replacing aging thermostats also helps protect your powerhead from overheating and scaling, two of the most common causes of engine damage.

With two thermostats and seals included, this kit provides everything you need to keep your cooling system functioning just like it did when new.

Why Choose Mercury OEM

The Quicksilver 75692Q2 is a genuine Mercury Marine part, built to the same standards used on factory engines. Many aftermarket parts can have incorrect opening temperatures or inconsistent quality, which can cause cooling issues or reduced performance.

Mercury OEM thermostats are tested to ensure accurate temperature control, corrosion resistance, and long-term reliability. Choosing OEM keeps your engine’s cooling system balanced and dependable in every condition.

FAQ

Q1: What engines does this kit fit?
It fits Mercury and Mariner V6 135–200HP outboards within the serial ranges listed above.

Q2: What’s included in the kit?
Two thermostats and two rubber gaskets, one for each thermostat.

Q3: What’s the thermostat’s temperature range?
It’s calibrated to open at Mercury’s specified temperature for these V6 outboards — ensuring steady cooling.

Q4: Why replace both thermostats at once?
Replacing both ensures even temperature control and balanced cooling throughout the engine.

Q5: Why OEM over aftermarket?
OEM thermostats match factory specifications and withstand marine conditions far better than off-brand alternatives.