Wartsila L20/R20 Main Bearings

The main bearings for the Wartsila L20 and R20 four-stroke diesel engines are precision-engineered components designed to support the crankshaft and ensure reliable power transmission. These engines, introduced in the 1990s, are renowned for their fuel flexibility (operating on MDO, HFO, and ultra-low sulfur fuels) and compact design . The main bearings are critical for maintaining the correct crankshaft alignment and absorbing combustion and inertial forces.

Specifications & Design
Part Numbers: The primary OEM part number for the standard main bearing kit is 100183. A specific"Main Bearing 0 Kit"is also available under part number 100186 .
Compatibility: These bearings are suitable for a wide range of in-line cylinder configurations, including:
L20 Series: 4L20, 5L20, 6L20, 7L20, 8L20, 9L20
R20 Series: 6R20 .
Thrust Bearings: In addition to standard main bearings, specific thrust bearing kits (e.g., part 100028) are available to manage axial crankshaft movement .