Crankshaft Main Bearing Set for Subaru Boxer Engines ⚙️

This precision main bearing kit supports the crank, keeps perfect oil clearance, and protects the engine bottom end. Chosen for engine rebuilds and noise fixes, it restores smooth rotation and stable oil pressure ?.

Why this part is needed

Main bearings carry combustion loads and center the crankshaft. Over time, heat, dirty oil, and knock wear the soft overlay. Replacing them prevents low oil pressure, bearing rumble at idle, and costly crank journal damage.

How it works

Split shells sit in the block and cap, forming a round bore. With proper clearance, oil creates a hydrodynamic film that floats the crank. Grooves and holes feed pressurized oil. The thrust faces control endplay for steady timing and quiet shifts ?️.

What happens if they fail

Loss of oil film leads to metal-to-metal contact, hot spots, and a spun bearing. Symptoms include low pressure light, glitter in oil, and deep knocking. Keep driving and the crank can seize—full engine rebuild required ❗

Installer tips

• Measure journals and housings; select correct grade
• Use Plastigage to confirm oil clearance
• Clean, oil, and torque caps in sequence
• Prime the oil system before first start ✅

• Xv
• Forester
• Legacy
• Impreza