BRGSETCRANKSHAFT

Precision Crankshaft Main Bearing Set for Subaru Boxer Engines

This kit keeps your flat-four running smooth and protected. It supports the crankshaft under heavy load, centers the rotating assembly, maintains correct oil clearance, and restores quiet, silky operation. Perfect when rebuilding, fixing low oil pressure, or eliminating bottom-end noise .

Why you need it

Bearings are the load-bearing surface between the block and crank. Over time, heat, oil starvation, or contaminated oil wear them out. Replacing them prevents journal scoring, vibration, and costly engine damage.

How it works

Thin-shell tri-metal halves sit in the block and caps. Pressurized oil forms a hydrodynamic film, so the crank never touches the bearing at speed. Correct crush-fit locks each shell; oil grooves and precise clearance keep pressure stable for quiet, efficient power .

What happens if it fails ⚠️

Symptoms include cold-start knock, glitter in oil, hot-idle pressure drop, and bearing rumble. Ignoring it can spin a bearing, seize the crank, crack the case, or scrap the engine.

Install tips ✅

Measure journals, choose correct size, clean meticulously, align tangs, lube generously, torque caps in sequence, verify clearance (Plastigage),prime the oiling system, and monitor pressure on first start.

Compatibility

• Xv
• Forester
• Legacy
• Impreza