Mercury – Drain Screw Gasket | Yamaha Replacement | Marine Sealing Washer | 8M0162524

Overview

There are some parts you never think about until the moment you need them — and when you do, you want the right one. A drain screw gasket might seem small, almost forgettable, but anyone who has ever watched a bead of gear oil creep down a skeg after a long run knows just how important it really is. The Mercury 8M0162524 Drain Screw Gasket brings the kind of quiet reliability you count on when you’re maintaining your engine at the ramp or in the driveway. It’s a simple piece, but it gives you peace of mind knowing your lower unit is sealed tight and ready for the next season, next trip, or next push offshore.

Key Features

• Replacement drain screw gasket for select Yamaha outboards
• Designed to replace Yamaha part numbers 904-30142-28-00, 90430-14228-00, and 90430-14M09-00
• Marine-grade sealing washer engineered for tight, leak-free fitment
• Built for durability under pressure, vibration, and temperature changes
• Genuine Mercury Marine part number 8M0162524

Engine & Boat Compatibility

This Mercury Marine part is suitable for:

• Yamaha outboards requiring the listed replacement gasket
• Common across many small to mid-range Yamaha four-stroke and two-stroke engines
• Ideal for fishing skiffs, pontoons, runabouts, tenders, lake boats, and coastal day boats
• Fits applications that use a standard drain screw sealing washer in the gearcase

(Always reference your owner’s manual for exact fitment.)

Performance & Practical Benefits

A strong seal at the drain screw protects one of the most vital systems on an outboard: the gearcase. This gasket compresses evenly as you tighten the drain screw, creating a snug, secure barrier that keeps water out and oil in. You’ll feel the difference as it seats — that tight, smooth turn of the driver that tells you the washer is doing its job.

On the water, this simple part helps protect your gears, bearings, and seals from the kind of moisture intrusion that can turn a good engine into a weekend-stopping repair bill. It stands up to temperature swings, vibration from long runs, and constant exposure to water. Whether you’re running a quiet creek or a choppy bay, this gasket helps keep things steady inside the lower unit.

Installation is quick and clean. Replace the old gasket, tighten the screw to spec, and your engine is ready to go. It doesn’t require special tools or complicated steps — just basic maintenance done right.

Why Buy OEM

With a part this important, the material quality truly matters. Aftermarket gaskets often cut corners with cheap metal or inconsistent thickness, which can lead to slow leaks that go unnoticed until the damage is already done. A genuine Mercury Marine part is engineered to maintain its shape, seal properly, and hold up under long-term pressure.

Buying OEM means you’re choosing dependability, the right tolerances, and a product that’s been tested for real-world marine use. For something that protects your lower unit, it’s worth doing it right.

FAQ

Q1: Which engines does this gasket fit?

It replaces several Yamaha drain screw gasket part numbers and fits many Yamaha outboards that use that standard washer.

Q2: How is it better than aftermarket versions?

OEM gaskets use higher-grade metal and maintain consistent sealing pressure, reducing the risk of leaks.

Q3: How do I confirm it’s the correct gasket?

Match your existing Yamaha part number with the listed replacements, or check your service manual.

Q4: Can this be used in saltwater and freshwater?

Yes — it’s designed for all marine environments.

Q5: Is installation easy?

Very. Remove the old gasket, install the new one, tighten to spec, and you’re set.