Engine & Performance Warehouse Connecting Rod Bearings Undersize

Engine & Performance Warehouse connecting rod bearings (also called rod bearings or con rod bearings) in undersize sizing are made for engine rebuilds where the crankshaft rod journals have been machined smaller. They sit between the connecting rod and the crankshaft journal. They give the rotating assembly a smooth, low-friction surface to run on.

Key Features:

• Undersize design: the bearing shell is thicker than a standard-size shell. This restores the correct oil clearance on a reground crankshaft journal.
• Supports the rotating assembly: the bearing carries the load between the connecting rod and the crankshaft. It also holds the oil film that reduces metal-to-metal wear.
• Built for engine rebuilds: they suit machine-shop rebuilds where the crankshaft has been ground to remove scoring, wear, taper or out-of-round conditions.
• Multiple undersize options: the product line is offered in more than one undersize measurement. Choose the one that matches your crankshaft's ground journal size.

Before installation, measure the crankshaft journals and the connecting rod bores. Check the bearing clearances during assembly to confirm proper oil clearance. Choose the undersize that matches your machined journal diameter.