Mercury – Quicksilver 8172771 Water Pump Gasket | Mercury & Mariner 2-Stroke & 4-Stroke Outboards | MerCruiser Alpha One Gen II | 8172771

Overview

Every cooling system depends on tight seals, and this one does the job right. The Quicksilver 8172771 Water Pump Gasket is designed for a wide range of Mercury and Mariner 2-stroke and 4-stroke outboards (30–400HP) and MerCruiser Alpha One Gen II sterndrives. It forms a watertight seal between the water pump housing and gearcase, preventing leaks and helping your engine maintain the right operating temperature.

Built to Mercury’s OEM specs, this gasket fits perfectly and holds up against heat, pressure, and saltwater exposure. Whether you’re rebuilding your pump or replacing a worn seal, it’s a simple part that protects your whole cooling system.

Key Features

• Purpose: Provides a precise seal for the water pump housing to prevent leaks and maintain steady cooling pressure.
• Fitment: For Mercury and Mariner outboards (30–400HP) and MerCruiser Alpha One Gen II sterndrives (serial No. 0D436859 & up).
• Compatibility Range: Fits models including F40–60 FourStroke BigFoot/Command Thrust, 60HP 2-stroke Big Foot (0D000750 & up), 70–90HP 3-cyl 2-stroke (0A996142 & up), 100–125HP 4-cyl 2-stroke, 150HP EFI FourStroke, V-200/225/250 3.0L 2-stroke, and 4- & 6-cylinder Verado outboards with 4.80-inch gearcase.
• Construction: Made from high-quality gasket material tested to Mercury Marine OEM standards.
• Ease of Use: Installs easily with standard hand tools; see your service manual for details.

Engine & Boat Compatibility

• Mercury & Mariner 2-stroke and 4-stroke outboards (30–400HP range)
• MerCruiser Alpha One Gen II sterndrives (serial 0D436859 & above)
• Common on fishing boats, pontoons, cruisers, and performance outboards

Performance & Practical Benefits

The 8172771 gasket keeps your cooling system sealed tight, helping maintain proper water pressure through the pump. A small leak can cause overheating or uneven cooling, but a fresh OEM gasket eliminates that risk.

It’s precision-cut for a perfect fit on Mercury and Mariner housings, so installation is quick and frustration-free. Built from durable marine-grade material, it resists heat and compression, holding its shape even after long hours of use. Replace it whenever you service the water pump — it’s cheap insurance against costly damage.

Why Buy OEM

Mercury’s OEM gaskets are engineered specifically for their housings and gearcases. Aftermarket copies often vary slightly in thickness or cut, which can cause small gaps and early failure.

A genuine Quicksilver gasket ensures proper sealing, cooling efficiency, and long-term reliability. It’s the same part Mercury installs at the factory — no guesswork, no leaks, no overheating.

FAQ

Q1: What does the Quicksilver 8172771 gasket fit?
A: It fits a wide range of Mercury & Mariner outboards (30–400HP) and MerCruiser Alpha One Gen II sterndrives.

Q2: What does the gasket do?
A: It seals the water pump housing to maintain pressure and prevent leaks in the cooling system.

Q3: Is this the only part I need for a water pump rebuild?
A: This kit includes the gasket only. Depending on wear, you may also need impellers, seals, or other gaskets.

Q4: Can I install it myself?
A: Yes. The gasket installs easily using basic tools; just follow the steps in your service manual.

Q5: Why OEM instead of aftermarket?
A: OEM gaskets fit perfectly, last longer, and ensure your engine’s cooling system performs as designed.