Micrometer Method for Connecting Rod Bearings
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Measure the crankpin diameter with a micrometer in several places along the length, approximately 90 degrees apart, minimum of 4 places, and average the measurements.
- Determine the taper and the out-of-round. Refer to Engine Mechanical Specifications .
- Install the NEW connecting rod bearings into the connecting rod cap and the connecting rod.
- Install the connecting rod cap and the original, used, nuts.
Tighten:
- Tighten the connecting rod nuts a first pass to 30 N.m (22 lb ft).
- Tighten the connecting rod nuts a final pass an additional 90 degrees using the J 45059 .
- Measure the connecting rod bearing inside diameter (ID) using an inside micrometer.
- Compare the connecting rod bearing clearance specifications. Refer to Engine Mechanical Specifications .
- If the connecting rod bearing clearances exceed specifications, replace components as required.
IMPORTANT:
When bearings are removed, NEW bearings must be installed during reassembly.
NOTE:
Refer to Fastener Notice
in Cautions and Notices.
IMPORTANT:
Use the original connecting rod nuts for clearance measurement. During final assembly new connecting rod nuts must be used to obtain correct fastener tightening.