Mercury – Driven Gear Bearing | Bravo Series Sterndrive Component | Precision-Machined Steel | 861787

Overview

There’s a certain comfort that comes from knowing the heart of your sterndrive is built on strong, dependable parts. When you’re trimming up and heading onto plane, or easing into a tight marina slip with currents pushing at you, the last thing you want is uncertainty in your drive system. A solid, smooth-running gear set can make the entire boat feel more predictable and more responsive. That’s exactly the kind of confidence the Mercury Marine part number 861787 Driven Gear Bearing brings—quiet, steady reliability that lets you focus on the experience, not the equipment.

Key Features

• Complete driven gear bearing assembly ready for installation
• Precision-machined steel construction for strength and longevity
• Designed specifically for MerCruiser Bravo sterndrive gear systems
• Engineered for smooth, consistent rotation under heavy load
• Built to Mercury Marine OEM specifications for exact fit and performance
• Suitable for model year 2000 and newer (serial number 0M100001 and above)

Engine & Boat Compatibility

• For MerCruiser Bravo I, Bravo II, Bravo III, Bravo X, Bravo XR, and Bravo XZ sterndrives
• Ideal for high-performance boats, cruisers, offshore sport boats, tow boats, and multipurpose family vessels
• Fits MerCruiser sterndrive systems using Bravo gear housings
• Works across a wide range of horsepower setups, from recreational to performance builds
• Always verify fitment using your service or owner’s manual

Performance & Practical Benefits

A sterndrive’s internal bearings carry tremendous responsibility. They support rotating loads, transfer torque, and endure constant pressure—whether you’re running offshore chop or idling along a quiet shoreline. The 861787 Driven Gear Bearing is built to shoulder that load without hesitation.

Once installed, you’ll notice how the drive feels tighter and more predictable. Shifts become smoother. Handling feels more controlled. The rotation through the gear assembly gains a clean, quiet steadiness that only a fresh, correctly machined bearing can deliver. This isn’t the kind of change you only feel at wide-open throttle—it improves the overall rhythm of running the boat.

Because this bearing is made to Mercury Marine’s exacting standards, it fits cleanly into place with no fuss. The alignment is right. The tolerances are correct. Everything seats the way it should, giving you a secure, factory-level install without guesswork. And once it’s in, the durability speaks for itself. Marine environments—heat, vibration, moisture—are tough on internal components, but this bearing is built for the long haul, holding steady through years of real-world conditions.

Why Buy OEM

When it comes to Bravo sterndrives, cutting corners on internal parts is a costly gamble. Aftermarket bearings might look similar, but slight differences in machining, load tolerances, or materials can create noise, premature wear, or worse—damage to the gear set.

Choosing a Mercury Marine OEM component like part number 861787 means you’re installing a piece engineered exactly for the task. It’s designed to handle the torque, the heat, and the constant load your drive system produces. It installs right the first time, performs correctly, and offers long-term peace of mind. As any seasoned boater will tell you: inside a sterndrive, precision is everything.

FAQ

Q1: Which Mercury engines or systems does the Driven Gear Bearing 861787 fit?

It fits MerCruiser Bravo I, II, III, X, XR, and XZ sterndrives from model year 2000 and newer.

Q2: What makes this part different from aftermarket options?

OEM bearings are machined to Mercury Marine’s exact standards, ensuring proper load distribution, smooth rotation, and reliable longevity.

Q3: How can I confirm this is the right part for my setup?

Match your sterndrive model and serial number with your owner’s or service manual recommendations.

Q4: Can this bearing be used in both freshwater and saltwater boats?

Yes. It’s engineered for corrosion resistance and long-term performance in any marine environment.

Q5: Is installation straightforward for most boat owners?

Installation requires mechanical experience and proper tools, but the part itself is a direct OEM fit with no modifications needed.