Mercury – 300 Hour Maintenance Kit | MerCruiser 4.5L MPI Bravo Series | OEM Service Components | 8M0147067

Overview

When you run a MerCruiser 4.5L MPI engine with a Bravo sterndrive, you get used to a certain steady confidence. The kind that comes from crisp throttle response, clean acceleration, and no surprises when you push the boat into open water. But even the most dependable setup needs its big check-in. The Mercury 8M0147067 300 Hour Maintenance Kit brings that familiar reassurance back to your boating routine. It’s all the essentials—thoughtfully packaged—so you can get your service done right and get back to the water without second-guessing a thing.

Key Features

• Complete 300-hour service kit for 4.5L MPI engines with Bravo sterndrive
• Includes oil filter, fuel filter, spark plugs, thermostat, thermostat gasket, serpentine belt, PCV valve, seawater pump impeller kit, and gearcase drain seals
• Heavy-duty electroplated housings for corrosion protection
• High-pleat filtration components for exceptional contaminant control
• All parts built to meet Mercury Marine OEM standards

Engine & Boat Compatibility

• Fits MerCruiser 4.5L MPI engines with Bravo sterndrive
• For model years 2014 and newer
• Ideal for runabouts, sport boats, cruisers, fishing boats, and any Bravo-driven setup running the modern 4.5L powerplant

Performance & Practical Benefits

A 300-hour service is the moment you reset everything that quietly keeps your boat running the way you love. Fresh ignition components help the engine light instantly and run smoother. The new thermostat and gasket stabilize operating temperature, which you’ll notice on long idle stretches or during slow-speed maneuvering. The seawater pump impeller—one of the most critical pieces in the cooling system—gets replaced before it ever has the chance to cause a headache.

The serpentine belt refresh ensures you won’t deal with slipping, squealing, or unexpected accessory failures offshore. And the oil and fuel filters, with their precise OEM pleat counts, help keep contaminants from sneaking into your engine’s internals. Everything fits tight, clean, and secure, just as Mercury intended. No guesswork, no awkward adjustments, no “close enough.” This kit restores the steady, predictable performance your 4.5L MPI was built to deliver.

Why Buy OEM

When you’re this far from the ramp, original equipment parts matter. The tolerances are better, the materials stronger, and the fit exact. Mercury designs these components for their own engines—not for “almost everything”—and that difference shows in smoother running, longer lifespan, and fewer maintenance surprises. OEM saves money in the long run because everything simply works the way it should the first time.

FAQ

Q1: Which engines does this kit fit?

It fits MerCruiser 4.5L MPI engines paired with Bravo sterndrives, model year 2014 and newer.

Q2: What makes this kit stand out from aftermarket versions?

Every part is engineered to Mercury’s own specifications, ensuring perfect fit and reliable long-term performance.

Q3: How do I verify compatibility?

If your engine is a 4.5L MPI with a Bravo sterndrive, this is the correct 300-hour kit.

Q4: Is it suitable for saltwater and freshwater?

Yes—every component is built for harsh marine environments, including corrosive conditions.

Q5: Is installation manageable for most boat owners?

Yes. If you’re comfortable performing scheduled maintenance, everything installs cleanly with standard tools.