Mercury – Quicksilver Thermostat Housing Gasket | Cooling System Seal | Cork | 47510

Overview

If you’re pulling apart the thermostat housing on an older MerCruiser, this is the gasket you’ll want on hand. The Mercury Marine 47510 Quicksilver Thermostat Housing Gasket fits MCM and MIE GM-based V6 and V8 engines that use the older two-piece housing design. Made from quality cork, it compresses nicely to create a solid, leak-free seal between the housing plates. It’s simple, tough, and built for the kind of heat, vibration, and moisture that comes with life on the water.

Key Features

• Purpose: Seals the thermostat housing to prevent coolant leaks and maintain system pressure.
• Material: Made from marine-grade cork that resists drying, cracking, and coolant exposure.
• Fit: Designed to match Mercury’s original two-piece housing dimensions perfectly.
• Performance: Keeps your cooling system tight and running efficiently.
• Durability: Handles constant heat cycles and vibration without breaking down.
• Compatibility: Fits MCM and MIE GM V6 and V8 marine engines with the early two-piece thermostat housing.

Engine & Boat Compatibility

• MCM GM V6 engines (older two-piece thermostat housing)
• MCM GM V8 engines (older two-piece thermostat housing)
• MIE GM V6 engines (older two-piece thermostat housing)
• MIE GM V8 engines (older two-piece thermostat housing)

Performance & Real-World Benefits

This cork gasket might be a small piece, but it plays a big role in keeping your engine running cool. It seals the thermostat housing to stop coolant from leaking out and air from sneaking in — two things that can throw off your engine’s temperature fast. The cork material conforms to minor imperfections in the housing surface, ensuring a snug, reliable seal.

Over time, older gaskets can dry out or crumble, leading to leaks or uneven cooling. Swapping in a new gasket when you replace your thermostat is an easy bit of maintenance that can save you from much bigger problems later.

Why Choose Mercury OEM

The Quicksilver 47510 is an authentic Mercury Marine part, designed specifically for the two-piece housings found on older MerCruiser engines. Aftermarket versions might be cut slightly off or made from cork that doesn’t hold up to marine heat and pressure.

Mercury’s OEM gasket is cut cleanly, fits exactly as it should, and seals tight without requiring excess sealant. It’s a straightforward part made right — the kind of detail that keeps a classic engine running strong and dry.

FAQ

Q1: What engines does this gasket fit?
It fits MCM and MIE GM-based V6 and V8 engines that use the early two-piece thermostat housing.

Q2: What’s it made of?
It’s made of high-quality cork, designed to compress evenly and handle marine heat and vibration.

Q3: Why replace it?
Old gaskets harden and leak over time. A new one ensures proper sealing and steady engine temperature.

Q4: Can I use this in saltwater applications?
Yes — it’s made for marine environments and won’t degrade quickly when exposed to salt or moisture.

Q5: Why OEM instead of aftermarket?
Mercury OEM gaskets fit perfectly and last longer, so you get a solid seal the first time — no guesswork.