Connecting Rod - Bearing Journal Clearance

Fig 1: Identifying Special Tool

Courtesy of FORD MOTOR CO.

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

1. Remove the connecting rod bearing cap.
2. Position a piece of Plastigage across the bearing surface.
   Fig 2: Positioning Plastigage Across Bearing Surface

   Courtesy of FORD MOTOR CO.
NOTE: Do not turn the crankshaft during this step.
3. Install and tighten to specifications, then remove the connecting rod bearing cap.
4. 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 the appropriate ENGINE article for the procedure.
   • If out of specification, install new components as necessary. Refer to the appropriate ENGINE article for the procedure.
   Fig 3: Measuring Connecting Rod Bearing Journal Clearance

   Courtesy of FORD MOTOR CO.