Connecting Rod Bearing Clearance (With Micrometer Gauge Internal Measuring Device)

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

Install the connecting bearings and the connecting rod bearing caps.
Tighten the 2 bolts in two passes using the EN-45059 meter:
CAUTION: Refer to Fastener Caution

NOTE: The old bolts can be reused for the measuring procedure.
1. First pass tighten to 45 N.m (33 lb ft).
2. Final pass tighten to an additional 60 degrees.
  CAUTION: Refer to Torque-to-Yield Fastener Caution .
Measure the connecting rod bearing diameters at 3 points as shown (1). Use a internal measuring device.

Fig 1: Measuring Connecting Rod Bearing Diameters
Courtesy of GENERAL MOTORS COMPANY
Calculate the average connecting rod inner diameter.
Formula: 1. result + 2. result + 3. result / 3
Measure the connecting rod journal diameter at 2 points between (1) and (3) and between (2) and (4). Use a micrometer gauge.

Fig 2: Connecting Rod Journal Diameter Points
Courtesy of GENERAL MOTORS COMPANY
Calculate the average connecting rod journal diameter.
Formula: 1. result + 2. result / 2.
Substract the average connecting rod journal diameter from the average connecting rod bearing diameter in order to determine the connecting rod bearing clearance.
The clearance should be 0.018 mm - 0.062 mm (0.0007 - 0.0024 in).