Main Bearing Clearance Inspection
- To check main bearing-to-journal oil clearance, remove the lower block and bearing halves (see CRANKSHAFT AND PISTON REMOVAL ).
- Clean each main journal and bearing half with a clean shop towel.
- Place one strip of plastigage across each main journal.
- Reinstall the bearings and lower block, then torque the bolts to 30 N.m (3.0 kgf.m, 22 lbf.ft).NOTE: Do not rotate the crankshaft during inspection.
- Tighten the bearing cap bolts an additional 56°.
- Remove the lower block and bearings again, and measure the widest part of the plastigage.
Main Bearing-to-Journal Oil Clearance
No. 1, 2, 4, 5 Journals:
Standard (New): 0.017 - 0.041 mm (0.0007 - 0.0016 in.)
Service Limit: 0.050 mm (0.0020 in.)
No. 3 Journal: Standard (New): 0.025 - 0.049 mm (0.0010 - 0.0019 in.)
Service Limit: 0.055 mm (0.0022 in.)
- If the plastigage measures too wide or too narrow, remove the crankshaft, and remove the upper half of the bearing. Install a new, complete bearing with the appropriate color code(s), and recheck the clearance. Do not file, shim, or scrape the bearings or the caps to adjust clearance.
- If the plastigage shows the clearance is still incorrect, try the next larger or smaller bearing (the color listed above or below the current one), and check again. If the proper clearance cannot be obtained by using the appropriate larger or smaller bearings, replace the crankshaft and start over.