Measuring Connecting Rod Bearing Clearance - Gaging Plastic Method

WARNING: This page is about a different variant/trim than selected.

IMPORTANT:

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 are required.
Do not rotate the crankshaft while gaging plastic is between the crankshaft journal and the bearing surface.

Fig 1: View Of Piston, Connecting Rod, Bearing Cap, Bearing Halves & Bolts

Courtesy of GENERAL MOTORS CORP.

Fig 2: View Of Gaging Plastic Installed On Crankshaft Journal

Courtesy of GENERAL MOTORS CORP.

Install the gaging plastic onto the connecting rod bearing journal. Install the gaging plastic the full width of the journal.

Fig 3: View Of Piston, Connecting Rod, Bearing Cap, Bearing Halves & Bolts

Courtesy of GENERAL MOTORS CORP.

NOTE: Refer to Fastener Notice in Cautions and Notices.

Install the bearing cap, bearing, and bolts.
Tighten:
1. Tighten the connecting rod bolts first pass to 20 N.m (15 lb ft).
2. Tighten the connecting rod bolts final pass to 75 degrees using the J 45059 .
Remove the bearing cap, bearing, and bolts.

Fig 4: Measuring Gaging Plastic

Courtesy of GENERAL MOTORS CORP.

Measure the gaging plastic at its widest area using the scale supplied with the plastic gaging kit. Refer to Engine Mechanical Specifications (LS6) .