Connecting Rod - Bearing Journal Clearance

WARNING: This page is about a different variant/trim than selected.

NOTE: The crankshaft connecting rod journals must be within specifications to check the connecting rod bearing journal clearance.

Remove the connecting rod bearing cap.
Position a piece of Plastigage across the bearing surface.

Fig 1: Measuring Connecting Rod Bearing Journal Clearance
Courtesy of MAZDA MOTORS CORP.

NOTE: Do not turn the crankshaft during this step.

Fig 2: Measuring Plastigage

Courtesy of MAZDA MOTORS CORP.

Install and tighten to specifications, then remove the connecting rod bearing cap.
Measure the Plastigage to get the connecting rod bearing journal clearance. The Plastigage should be smooth and flat. A changing width indicates a tapered or damaged connecting rod or connecting rod bearing. Refer to SPECIFICATIONS .
- If out of specification, install new components as necessary.