Mercury – Quicksilver Thermostat Gasket | Cooling System Seal | Marine-Grade Composite | 33179Q02

Overview

Your MerCruiser’s cooling system depends on a perfect seal to perform at its best. The Mercury Marine 33179Q02 Quicksilver Thermostat Gasket is designed for MerCruiser V6 and V8 engines with a flat thermostat cover plate, ensuring a tight fit that prevents leaks and maintains consistent cooling temperatures. Made from durable, marine-grade composite material, this gasket stands up to heat, vibration, and water exposure — keeping your engine running at the ideal temperature for smooth, efficient performance.

Key Features

• Purpose: Seals the thermostat housing to prevent coolant leaks and maintain proper engine temperature.
• Material: Made from heat- and pressure-resistant composite for long-lasting sealing performance.
• Design: Cut precisely to Mercury Marine OEM specifications for a clean, exact fit on V6 and V8 engines.
• Performance: Ensures your cooling system maintains steady temperature and peak efficiency.
• Compatibility: Fits MerCruiser V6 and V8 engines with flat thermostat cover plates.
• Maintenance: Replace the gasket whenever servicing the thermostat to prevent future leaks.

Engine & Boat Compatibility

• Designed for MerCruiser V6 and V8 sterndrive and inboard engines using a flat-style thermostat cover plate.
• Works in freshwater and saltwater applications.
• Common on cabin cruisers, offshore boats, and sport runabouts with MerCruiser power.

Performance & Practical Benefits

The 33179Q02 gasket creates a clean, tight seal that keeps your thermostat housing leak-free and your cooling system stable. A proper seal prevents hot spots, coolant loss, and uneven engine temperatures — problems that can reduce power and efficiency over time.

It’s designed to withstand heat cycling, vibration, and contact with coolant without shrinking or cracking. Replacing your gasket when installing a new thermostat is a simple, low-cost step that helps your MerCruiser run cooler and last longer.

Why Buy OEM

Sealing parts may look simple, but precision matters. The Quicksilver 33179Q02 is a genuine Mercury Marine part, built from the same material and dimensions your engine was designed around. Generic gaskets often use weaker materials or imprecise cuts that can lead to leaks or uneven sealing pressure.

Mercury’s OEM gaskets are tested for fit, heat resistance, and long-term durability — giving you the same performance and reliability your engine had when it left the factory.

FAQ

Q1: What engines does this gasket fit?
It fits MerCruiser V6 and V8 engines with flat thermostat cover plates.

Q2: Why should I replace the gasket when changing thermostats?
Gaskets compress over time; replacing them ensures a proper seal and leak-free operation.

Q3: What is it made of?
A marine-grade composite material designed to handle pressure, heat, and coolant contact.

Q4: Can it handle saltwater conditions?
Yes — it’s built for use in both freshwater and saltwater environments.

Q5: Why OEM instead of aftermarket?
Mercury’s OEM gaskets fit perfectly and hold up under marine heat and vibration, ensuring proper sealing and performance.