Crankshaft & Main Bearings
- Ensure main bearing caps are numbered for location, and arrow on cap points toward timing belt end of crankshaft. Remove main bearing cap bolts in reverse order of tightening sequence. See Fig 1
.
- Cylinder block main bearing bore size is indicated by a numerical size mark stamped on cylinder block. See Fig 2
. Main bearing journal size is indicated by the number of dashes (--) stamped near crankshaft counterweight.
- If bearing number on original bearing cannot be obtained, use size mark on cylinder block and crankshaft to determine proper size main bearing by color code. See Fig 3
.
- When installing main bearing caps, ensure arrow on cap points toward timing belt end of crankshaft. Tighten bolts in sequence to specification. See Fig 1
. See TORQUE SPECIFICATIONS table at end of article. Ensure crankshaft end play is within specification. See CRANKSHAFT, MAIN & CONNECTING ROD BEARINGS table under ENGINE SPECIFICATIONS at end of article.
Courtesy of GENERAL MOTORS CORP.
Courtesy of GENERAL MOTORS CORP.
Courtesy of GENERAL MOTORS CORP.