Procedures

ENGINE OUT OF CAR

NOTE: Be sure to number main bearing caps before removing, then remove main caps and lower bearing shells and retain in sequence. It is important to keep the bearing shells in pairs and mark them with the number of the respective journal until it is decided if the bearing shells are to be refitted.

1. Remove oil pan and timing cover.

Main Bearing Caps & Crankshaft:

2. Remove main bearing caps and lift out the crankshaft and rear oil seal.

Measuring Crankshaft Run-out:

3. Rest the crankshaft on vee-blocks at numbers one and five main bearing journals.
4. Using a dial indicator, check the run-out at numbers two, three and four main bearing journals. The total indicator readings at each journal should not exceed 0.08 mm (0.003 in).
5. While checking the run-out at each journal, note the relation of maximum offset on each journal to the others. The maximum on all journals should all come at very near the same angular location.
6. If the crankshaft fails to meet the foregoing checks it is bent and is unsatisfactory for service.
7. Check each crankshaft journal for out of round. If the out of round exceeds 0.040 mm (0.0016 in) around the crankshaft journal, a reground or new crankshaft should be fitted.

Check main bearing clearance

8. Remove the oil seals from the cylinder block and the rear main bearing cap.
9. Locate the upper main bearing shells into the cylinder block. These must be the shells with the oil hole and oil grooves.
10. Locate the flanged upper main bearing shell in the center position.
11. Place the crankshaft in position on the bearings.

Plastigauge On Main Bearing Journal:

12. Place a piece of Plastigauge across the center of the crankshaft main bearing journals.
13. Locate the bearing lower shell into the main bearing cap.
14. Fit numbers one to four main bearing caps and shells, tighten to 68-75 Nm (50-55 ft lb).
15. Fit the rear main bearing cap and shell and tighten to 88-95 Nm (65-70 ft lb). Do not allow the crankshaft to be rotated while the Plastigauge is in use.
16. Remove the main bearing caps and shells.
17. Using the scale printed on the Plastigauge packet, measure the flattened Plastigauge at its widest point.
18. The graduation that most closely corresponds to the width of the Plastigauge indicates the bearing clearance.
19. The correct bearing clearance with new or overhauled components is 0.023 to 0.065 mm (0.0009 to 0.0026 in).
20. If the correct clearance is not obtained initially, select a suitable bearing to give the required clearance.
21. Wipe off the Plastigauge with an oily rag. Do NOT scrape it off.