Mercury – 300 Hour Maintenance Kit | MerCruiser 3.0L Carbureted | OEM Service Components | 8M0147061

Overview

If you’ve spent any amount of time behind the helm of a MerCruiser 3.0L carbureted engine, you know exactly why boaters keep these powerplants around for decades. They’re simple, steady, and honest—an engine that doesn’t ask for much but serves you well as long as you take care of it. The Mercury 8M0147061 300 Hour Maintenance Kit pulls together every essential piece required for a deep, meaningful service. It’s the kind of maintenance that restores confidence, tightens everything back to factory intention, and keeps your engine running cool, clean, and dependable on long weekend runs or lazy cruises back to the dock.

Key Features

• Complete 300-hour service kit for 3.0L carbureted MerCruiser engines
• Includes oil filter, fuel filters, gearcase drain seals, spark plugs, thermostat, thermostat gasket, and V-belts
• High-grade filtration components with premium pleat counts
• Heavy-duty electroplated housings designed to fight corrosion
• OEM specifications ensure proper fit and lasting reliability

Engine & Boat Compatibility

• Designed for MerCruiser 3.0L carbureted engines (General Motors, 2000 and newer)
• Fits sterndrive installations commonly found in runabouts, bowriders, small cruisers, and fishing boats
• Suitable for both single-engine and twin-engine setups
• Compatible with engines using standard 3.0L GM-based sterndrive architecture

Performance & Practical Benefits

Every boater knows that the 3.0L carbureted MerCruiser will run a long time if you treat it right. This 300-hour kit goes beyond the basics—replacing not just filters and seals, but the parts that quietly influence how well the engine breathes, cools, and stays protected.

The fresh spark plugs bring back crisp, dependable ignition so the engine fires smoothly and idles evenly. The thermostat and gasket help maintain steady operating temperature, keeping performance predictable whether you’re wide open or easing through a no-wake zone. The filters tackle contaminants before they have a chance to rob you of power or fuel economy. Even the V-belts—often overlooked—give you solid mechanical feel and secure accessory drive, preventing unexpected slippage or failures.

Altogether, the kit leaves your 3.0L feeling renewed: the throttle response steadier, the idle more confident, and the entire system running with that tight, just-serviced assurance you can feel through the hull.

Why Buy OEM

When you’re dealing with a full 300-hour service, precision matters. OEM Mercury parts fit right the first time, last longer in harsh marine conditions, and follow the exact engineering the engine was built around. Aftermarket kits may look similar, but they rarely match Mercury’s testing standards or filtration quality. With OEM, you reduce risk, avoid premature failures, and protect the engine you rely on every single time you leave the ramp.

This kit isn’t just parts—it’s peace of mind.

FAQ

Q1: Which engines does this kit fit?

It fits MerCruiser 3.0L carbureted engines from 2000 and newer.

Q2: What makes it better than aftermarket kits?

OEM components provide exact fitment, top-tier corrosion resistance, and proper filtration.

Q3: How can I confirm it’s the right kit?

Check your engine’s model and year—if it’s a 3.0L carbureted GM-based MerCruiser from 2000+, this is the correct kit.

Q4: Can it be used in saltwater?

Yes. All components are built for both freshwater and saltwater environments.

Q5: Is installation straightforward?

Most boat owners familiar with routine service will find the installation direct and manageable.