Mercury – Water Pump Gasket | Quicksilver Series | Composite Fiber | 858524

Overview
There is a certain comfort that comes from knowing your cooling system is sealed up tight. Anyone who’s ever watched engine temps climb a little higher than they’d like knows that uneasy feeling in their gut. A simple gasket may not look like much in your hand, but out on the water, it’s one of those quiet heroes that keeps everything steady. The Quicksilver Water Pump Gasket 858524 is the kind of part you trust because you know what happens when you don’t—overheating, stress, and the kind of surprises no boater wants miles from shore. With this gasket in place, the entire cooling system just feels right: dependable, consistent, and worry-free.

Key Features
• Creates a secure, leak-free seal in the water pump housing.
• Composite fiber construction designed for durability under heat and pressure.
• Precision fit for reliable cooling system performance.
• Designed for Mercury and Mariner engines using short-vane impellers.
• Built to OEM standards to match the exact water pump profile and bolt pattern.

Engine & Boat Compatibility
• Fits MerCruiser 1, R, MR, and Alpha One sterndrives.
• Works with Mercury and Mariner 65 horsepower through V6 outboards.
• Ideal for runabouts, cruisers, pontoons, fishing boats, and ski boats.
• Compatible with both recreational and workboat cooling systems.

Performance & Practical Benefits
A water pump gasket isn’t flashy, but the difference between a worn one and a fresh one is huge. This one seats smoothly, tightens down with confidence, and instantly restores that secure connection that keeps water flowing through the engine. With the Quicksilver 858524 gasket installed, the cooling system maintains steady circulation, giving your engine the regulated temperature it depends on for long life. There’s no guesswork, no weeping edges, no mid-season surprises.

Service techs appreciate how cleanly it lays into the housing, and boat owners appreciate how it protects the engine from overheating and premature wear. It’s a simple step that adds up to smoother performance, cooler running temps, and a boat that responds exactly how you expect it to.

Why Buy OEM
Gaskets are one place you never want to gamble. An aftermarket option might look close, but even a small difference in thickness, shape, or material can cause leaks. With an OEM Mercury Marine part, you know the exact fit, exact durability, and exact sealing strength are built in. You’re not patching something together, you’re restoring it properly. And long term, that saves money, frustration, and a whole lot of unplanned maintenance.

FAQ
Q1: Which engines does the 858524 gasket fit?
It fits MerCruiser 1, R, MR, and Alpha One sterndrives, as well as Mercury and Mariner 65 horsepower through V6 outboards.

Q2: What makes this gasket better than aftermarket copies?
The material quality and the precise fit match Mercury’s cooling system specifications exactly, preventing leaks and overheating.

Q3: How do I confirm this is the right gasket?
Match your water pump style and confirm your part number—858524—against your service manual.

Q4: Can it be used in saltwater and freshwater engines?
Yes, it performs well in both environments.

Q5: Is installation straightforward?
Most boaters who service their own impellers find it simple with standard hand tools.