Mercury – Quicksilver Thermostat Housing Gasket | Cooling System Seal | Marine Composite | 53045Q01

Overview

A good seal keeps your cooling system efficient and your engine safe. The Mercury Marine 53045Q01 Quicksilver Thermostat Housing Gasket is made for MCM and MIE GM-based V8 marine engines, ensuring a tight fit and long-lasting seal between the housing surfaces. Built from durable, heat-resistant material, it prevents coolant leaks and pressure loss that can lead to overheating. It’s a small part, but a critical one — designed to keep your engine running at the proper temperature, season after season.

Key Features

• Purpose: Seals the thermostat housing to prevent coolant leaks and maintain system pressure.
• Material: Made from marine-grade composite for heat, coolant, and corrosion resistance.
• Design: Precision-cut to OEM Mercury dimensions for a perfect, leak-free fit.
• Durability: Handles constant heat cycles, vibration, and exposure to marine environments.
• Performance: Keeps your cooling system efficient and your engine at its proper operating temperature.
• Compatibility: Fits MCM and MIE GM V8 marine engines.

Engine & Boat Compatibility

• MCM GM V8 marine engines
• MIE GM V8 marine engines

Performance & Real-World Benefits

The 53045Q01 gasket is designed to do one thing extremely well — keep coolant where it belongs. It provides a clean, secure seal between the thermostat housing and manifold, preventing coolant leaks that can cause temperature fluctuations or overheating.

Its marine-grade composite material holds up to heat, pressure, and vibration, staying flexible and reliable even after years of use. Replacing the gasket during a thermostat service or when you notice seepage is a quick fix that helps prevent expensive engine repairs down the road.

Why Choose Mercury OEM

The Quicksilver 53045Q01 is a genuine Mercury Marine part, built to fit GM-based MerCruiser engines perfectly. Aftermarket gaskets may look similar but often don’t seal as well, or they use materials that degrade faster under marine conditions.

Mercury’s OEM gaskets are made from tested, high-quality materials that maintain a tight seal through heat and vibration. It’s the kind of part you can install once and trust every time you turn the key.

FAQ

Q1: What engines does this gasket fit?
It’s made for MCM and MIE GM V8 marine engines.

Q2: What’s it made from?
A marine-grade composite material that resists heat, coolant, and corrosion.

Q3: Why should I replace the gasket?
Over time, gaskets can shrink or crack, leading to coolant leaks and reduced cooling efficiency.

Q4: Is it suitable for saltwater use?
Yes — it’s built to perform in both freshwater and saltwater environments.

Q5: Why OEM instead of aftermarket?
Mercury OEM gaskets fit perfectly and last longer, ensuring proper sealing and consistent cooling.