Top Line Manufacturing MBTO54STD Engine Crankshaft Main Bearing Set Standard Size

The Top Line Manufacturing MBTO54STD is an engine crankshaft main bearing set in standard (STD) size. Main bearings support the crankshaft in the engine block. They let it rotate smoothly and carry its loads. This set is for engine rebuilds and overhauls where the crankshaft journals are still at original size.

Key Features:

• Brand: Top Line Manufacturing
• Part number: MBTO54STD
• Part type: engine crankshaft main bearing set (also called main bearings or crank bearings)
• Size: standard (STD) undersize/oversize designation. Other sizes in this part family, such as .010, are sold under separate part numbers.

Use it as part of a complete engine rebuild, and check crankshaft journal dimensions and bearing clearances before installation.