Connecting Rod - Bearing Journal Clearance

WARNING: This page is about a different car, the 2003 Mazda Tribute and 2002 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.

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: Positioning Plastigage Across Bearing Surface
Courtesy of MAZDA MOTORS CORP.

NOTE: Do not turn the crankshaft during this step.

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 .
1. If out of specification, install new components as necessary.
Fig 2: Measuring Plastigage (Connecting Rod Bearing Journal Clearance)
Courtesy of MAZDA MOTORS CORP.