Measuring Connecting Rod Bearing Clearance - Gaging Plastic Method

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Fig 1: Gaging Plastic Installed On Crankshaft Journal

Courtesy of GENERAL MOTORS CORP.

NOTE:

Connecting rod bearings are a precision insert type. Connecting rods are of a powdered metal design and cannot be shimmed or filed for bearing fit. If clearances are found to be excessive, a new bearing and/or connecting rod is required.
Do not rotate the crankshaft while gaging plastic is between the crankshaft journal and the bearing surface.

Remove the bearing cap, bearing half, and bolts. Refer to Piston, Connecting Rod, and Bearing Removal .
Install the gaging plastic onto the connecting rod bearing journal. Install the gaging plastic the full width of the journal.
Install the bearing cap, bearing half, and bolts. Refer to Piston, Connecting Rod, and Bearing Installation .
Remove the bearing cap, bearing half, and bolts. Refer to Piston, Connecting Rod, and Bearing Removal .

Fig 2: Measuring Gaging Plastic

Courtesy of GENERAL MOTORS CORP.

Using the scale supplied with the plastic gaging kit, measure the gaging plastic at its widest area. Refer to Engine Mechanical Specifications (RPO LC9 VIN 3) , Engine Mechanical Specifications (RPO LMG VIN 0) , Engine Mechanical Specifications (RPO L9H) , Engine Mechanical Specifications (RPO L94 VIN F) , Engine Mechanical Specifications (RPO L96 VIN G) .