Mercury – MerCruiser Alpha One Gen II 300 Hour Maintenance Kit | Precision Sterndrive Service Kit | Marine-Ready Components | 8M0147073

Overview

Boaters who run a MerCruiser Alpha One Gen II sterndrive know the feeling of depending on gear that’s built to last. There’s a steady confidence that comes from hearing that familiar shift into gear, or feeling the boat glide onto plane without hesitation. But even the toughest drive needs regular care to keep performing the way it always has. The Mercury Marine part number 8M0147073 300-hour maintenance kit brings everything together in one place, giving you the parts you need and the reassurance you want before heading back out on the water.

Key Features

• Complete 300-hour service kit for MerCruiser Alpha One Gen II sterndrive systems (1991 and newer)
• Includes drive install gasket kit, aluminum anode kit, gearcase drain seals, transom repair kit, shift cable kit, water pump impeller kit and gearcase fill and drain screws
• Durable components engineered for long-term marine use
• Corrosion-resistant aluminum anodes protect your drive season after season
• Precision-matched gaskets and seals for a tight, reliable fit

Engine & Boat Compatibility

• Fits all MerCruiser Alpha One Gen II sterndrives from 1991 and newer
• Works with a wide range of boat types including runabouts, bowriders, cruisers, fishing boats and family weekenders
• Ideal for owners who maintain classic sterndrive setups with long hours on the water

Performance & Practical Benefits

When you’re running a Gen II drive, you can feel the difference good maintenance makes. Fresh seals give you that tight, smooth shift that inspires confidence when you ease into gear. A new impeller restores dependable cooling, giving your engine the steady temperature control it needs on long runs. And updated anodes mean your drive stays protected against corrosion, especially in brackish or saltwater environments.

Every part in this kit fits cleanly and installs without the headaches that come from mismatched aftermarket components. Gaskets sit flush, hardware threads in cleanly and the shift cable operates with that familiar Mercury precision once it’s replaced. You’ll notice a quieter ride, steadier handling and a sense of security that only comes from knowing the drive beneath you is properly cared for. This kit is designed to bring back that feeling — of a boat that listens, responds and performs exactly the way it should.

Why Buy OEM

With a sterndrive design as proven as the Alpha One Gen II, genuine Mercury Marine parts make the most sense. Each component is engineered to match factory specs, ensuring long-term reliability and the correct fit the first time you install it. Aftermarket kits might seem tempting, but they often fall short in fit, materials or durability. OEM parts, on the other hand, save time, reduce frustration and help your drive last longer. If a fellow boater asked for advice, you’d probably say the same thing: go with the parts Mercury engineered for your system, and you’ll avoid a lot of headaches.

FAQ

Q1: Which systems does the 8M0147073 maintenance kit fit?

It fits all MerCruiser Alpha One Gen II sterndrives built from 1991 and newer.

Q2: What makes this OEM kit better than aftermarket alternatives?

The fit is exact, the materials are built for marine use and everything is designed to support long-term reliability.

Q3: How can I confirm this is the correct kit for my drive?

If your boat is powered by an Alpha One Gen II sterndrive, this Mercury Marine part number is the correct 300-hour service kit.

Q4: Is it suitable for saltwater and freshwater operation?

Yes — the aluminum anodes and marine-grade components are designed to perform in both environments.

Q5: Is installation manageable for most owners?

Absolutely. Anyone familiar with basic sterndrive maintenance will find the fit straightforward and secure.