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 proper sequence. See Fig 1
.
- Cylinder block main bearing bore size is indicated by a size mark number, "1", "2" or "3", stamped on cylinder block. Refer to Fig 2
. Main bearing journal size is indicated by a size mark number, "0", "1" or "2", located near crankshaft counterweight.
Courtesy of GENERAL MOTORS CORP.
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
- If bearing size mark on original bearing cannot be obtained, use number on cylinder block (main bearing bore size mark) and number on crankshaft (main bearing journal size mark) to determine bearing number. See MAIN BEARING SELECTION table.
MAIN BEARING SELECTION
| Main Bearing Bore Size Mark |
Main Bearing Journal Size Mark |
Bearing Size Mark |
| 1 |
0 |
1 |
| 1 |
1 |
2 |
| 1 |
2 |
3 |
| 2 |
0 |
2 |
| 2 |
1 |
3 |
| 2 |
2 |
4 |
| 3 |
0 |
3 |
| 3 |
1 |
4 |
| 3 |
2 |
5 |
- When installing main bearing caps, ensure arrow on cap points toward timing belt end of crankshaft. Tighten bolts in sequence. See Fig 1
.
- Tighten bolts to specification. 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.