Connecting Rod - Bearing Journal Clearance

Special Tool(s) 

Fig 1: Identifying Special Tools

Courtesy of FORD MOTOR CO.

1. Remove the connecting rod bearing cap.
2. Position a piece of Plastigage across the bearing surface.
   Fig 2: Measuring Connecting Rod Bearing Journal Clearance

   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.
   • If out of specification, install new components as necessary.
   Fig 3: Measuring Plastigage

   Courtesy of FORD MOTOR CO.