The Upper Main Big Ball Bearing (30-848280) for the Big Bearing Crank is a critical component in high-performance Mercury Racing 2.5-liter 280 EFI, 280 ROS, 300 Drag, and S3000 V6 2-stroke race powerheads.
Designed to handle the extreme stresses and high RPMs these race engines endure, this precision-engineered bearing ensures optimal crankshaft support, reducing friction and enhancing overall engine longevity.
The Big Ball Bearing, Upper Main is manufactured to exacting tolerances, meeting or exceeding OEM specifications. It serves as a direct replacement for Mercury Racing part numbers 848280 and 849819, with the manufacturer item number 30-848280. This bearing plays a vital role in maintaining crankshaft alignment, which is crucial for reducing wear on internal components and preventing premature engine failure.
For Mercury 280 ROS, 300 Drag, and S3000 race powerheads, achieving peak performance requires components that can withstand extreme loads and high rotational speeds. The Big Bearing is required for the Big Bearing Crank:
Durability – Engineered with high-grade materials to withstand the intense pressures of high-performance applications.
Reduced Friction – Precision-machined surfaces minimize friction, reducing heat buildup and improving efficiency.
Optimized Load Distribution – Supports the crankshaft and absorbs radial loads to maintain smooth engine operation.
OEM Fitment – Direct replacement for the original bearing, ensuring a seamless installation.
The Mercury Racing 2.5 Liter EFI V6 engines are designed for aggressive performance in offshore, F1 Tunnel Boats and drag racing applications. These engines operate at high RPMs, making bearing integrity a critical factor in reliability. A failing upper main bearing can lead to misalignment, excessive vibration, and potential catastrophic engine damage.
Regular inspection and replacement of this bearing are essential for maintaining engine performance and longevity.
When replacing the Upper Main Bearing it is essential to follow proper installation procedures to ensure optimal performance. Proper lubrication, oiling line, check vlaue, correct seating of the bearing, and ensuring the surrounding components are free of wear or damage will contribute to maximum durability.
Additionally, pairing this bearing with high-quality lubricants and ensuring proper break-in procedures will further enhance its lifespan.
The Upper Main Big Ball 849819 Bearing is a crucial component for the Mercury Racing 280 ROS, 300 Drag, and S3000 V6 2-stroke engines, offering enhanced performance, durability, and reliability.
Whether for high-speed offshore racing or drag applications, ensuring that this bearing is in top condition is key to preventing engine failures and maintaining peak output.
Replacing worn or damaged bearings with a high-quality component such as the 30-848280 ensures that your high-performance outboard continues to operate at its best and top performance.
For technical support contact Mike Hill at mike@buckshotracing77.com or call +1-714-697-1716