Connecting Rod - Bearing Journal Clearance

Fig 1: Identifying Plastigage

Courtesy of FORD MOTOR CO.

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 2: Measuring Connecting Rod Bearing Journal Clearance
Courtesy of FORD MOTOR CO.

NOTE: Do not turn the crankshaft during this step.

Install and tighten to specifications, then remove the connecting rod bearing cap. See SPECIFICATIONS .
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.
Fig 3: Measuring Plastigage
Courtesy of FORD MOTOR CO.