12108AB101 Subaru BRG SET-CONN ROD, Price: 110.96$, Weight: 0.323kg

Engine Con Rod Bearing Set for Subaru Boxer Engines ⚙️

Why this part is needed

These bearings sit between the connecting rod and the crankshaft journal. They keep a precise oil film so parts don’t touch metal-to-metal. In a Subaru flat-four, they carry huge loads every cycle. Fresh bearings restore correct clearance, stabilize oil pressure, and protect the crank. Perfect for engine rebuilds, knock repair, or high-mileage service.

How it works

Two semi-circular shells lock into the rod and cap, then torque around the crank. With proper clearance, engine oil forms a hydrodynamic wedge that floats the rod on the journal at speed. The tri-metal lining resists wear, heat, and brief oil starvation. Correct sizing (STD or undersize for ground cranks) and smooth surfaces keep friction low and power strong.

What happens if it’s worn or broken

Symptoms include cold start knock, hot idle rattle, metal glitter in oil, and falling oil pressure. Let it go and a bearing can spin, scoring the crank, bending a rod, or seizing the engine. Expect loss of power, misfire, and costly machining. Replace at the first sign of noise or during overhaul.

Install tips from a pro

Measure journal size and out-of-round. Test clearance with Plastigage. Clean everything, use assembly lube, and torque rod bolts in stages. Keep shells dry on the back, oiled on the face, and align tangs. Always follow Subaru specs for your EJ/FB series. Big-end bearings done right mean a smooth, long-lived boxer.