Mercury – Drain Screw Seals | Gear Case Components | Rubber-Coated Stainless Steel | 8M0183616 (Pack of 4)

Overview

There’s a quiet kind of confidence that comes from knowing your gear case is sealed tight and protected from the water you’re running through. It’s one of those small details that doesn’t cross your mind during a long day on the bay — and that’s exactly how it should be. These Mercury Marine parts help keep things that way. Whether you’re cruising across glass-calm water or bouncing through afternoon chop, having the right drain screw seals in place means your gear case stays dry, healthy, and ready for whatever the day brings.

Key Features

• Rubber-coated Stainless Steel drain screw seals designed for secure gear case protection
• Built for three-eighths by sixteen drain and fill screw holes
• Durable, corrosion-resistant construction
• Provides tight, consistent sealing after gear lube changes
• Mercury Marine part number 8M0183616 (pack of four)

Engine & Boat Compatibility

• Fits Mercury and Mariner outboards equipped with three-eighths by sixteen gear case drain and fill screws
• Compatible with all MerCruiser sterndrives using the same drain screw size
• Ideal for bass boats, pontoons, offshore boats, runabouts, and family cruisers
• Suitable for both recreational and commercial marine applications

Performance & Practical Benefits

These seals may be small, but anyone who’s ever dealt with water intrusion knows just how important they are. When installed correctly, they create a tight, smooth barrier that keeps water out of the gear case — and that means everything inside stays protected, lubricated, and running the way it should. The rubber-coated Stainless Steel design grips cleanly, seats securely, and doesn’t deform under pressure the way cheaper materials often do.

You’ll notice how confident you feel after each gear lube change — that sense of security when you reinstall the drain screw and know the seal is doing its job. Even over long seasons of use, the material holds up well against corrosion, heat, and vibration. Keeping a pack of spares on hand means you never have to question whether an old seal is still good or risk reusing one that might fail down the road. It’s a simple bit of insurance that protects one of the most important parts of your propulsion system.

Why Buy OEM

The gear case isn’t an area where you want surprises — one bad seal can lead to water intrusion, and that can turn into a very expensive repair. That’s why seasoned boaters choose genuine Mercury Marine parts. These seals are built to the exact specs your outboard or sterndrive needs, with materials tested to hold up in real-world conditions. While aftermarket versions may look similar, they rarely offer the same consistency or long-term reliability.

Using the correct part number ensures proper fit, proper compression, and proper protection. It’s the kind of practical advice you’d hear at any boat ramp: trust the seals built for your engine, and you’ll spend more time on the water and far less worrying about what’s happening inside the lower unit.

FAQ

Q1: Which Mercury engines do the Drain Screw Seals 8M0183616 fit?

They fit most Mercury and Mariner outboards, along with all MerCruiser sterndrives using three-eighths by sixteen drain and fill screws.

Q2: What makes them better than aftermarket washers?

They’re made from rubber-coated Stainless Steel and built to Mercury’s standards, providing a more reliable, longer-lasting seal.

Q3: How can I tell if this is the right replacement?

If your drain screw uses a three-eighths by sixteen thread, and your manual calls for this seal size, 8M0183616 is the correct part.

Q4: Can these be used in saltwater?

Absolutely. The Stainless Steel core and rubber coating are designed to hold up in harsh, corrosive environments.

Q5: Are they easy to install?

Yes — simply replace the old seal with a new one when performing a gear lube change. They seat cleanly and require no special tools.