Checking the main bearings
1. Clean the cylinder block main bearings and crankshaft journals.
2. Place plastic gauges on each crankshaft journal.
3. Install the main journal bearings and the main bearing cap bridge.
Tightening torque:
- Stage 1 - 25 Nm
- Stage 2 - turn 40°
Note: Do not rotate the crankshaft.
4. Remove the main caps, bearing caps and cap bridge. Measure the thickness of the plastic gauge at the widest part.
Main bearing oil clearance:
- nominal - 0.018 - 0.036 mm
- maximum - 0.050 mm
If the clearance exceeds the maximum, replace the main bearing shells with shells with the same color mark. Check the oil clearance.
If the clearance is still not within specification, replace the bearings with larger or smaller bearings (color coded below). Check the oil clearance. If the clearance is still not within specification, replace the crankshaft and check the clearance again.
Selection of main bearing shells
1. The main journal size group mark is stamped on the cylinder block.
If you cannot read the code due to deposits, do not clean the marks with a wire brush, use a solvent.
2. The crankshaft journal code is stamped on the crankshaft.
3. Use the table to select the required replacement liners.
