1 - bolt; 2 - gasket washer; 3 - damper; 4 - asterisk; 5, 10 - bearing shell; 6, 9 - thrust bearing shell; 7 - gear wheel; 8 - locking bolt; 11 - key; 12 - shaft mark
The supports are made in the body of the crankcase of the cylinder block in the form of plain bearings. Oil grooves are made in the upper shells of the main bearings. Counterweights are made on the cheeks of the shaft. cast together from the shafts. Crankshafts are divided into three size groups, marked with colored colorful marks (yellow, green and white) on the cheeks in the area of counterweights.
The diameter of the main journals of the crankshaft of the engine «M54»:
- yellow label
- nominal size: 59.984 - 59.990 mm
- size 1st class: 59.734 - 59.740 mm (0.25 mm reduction)
- size 2nd class: 59.484 - 59.490 mm (reduction by 0.50 mm)
- green label
- nominal size: 59.977 - 59.983 mm
- size 1st class: 59.727 - 59.733 mm (reduction by 0.25 mm)
- size 2nd class: 59.477 - 59.483 mm (reduction by 0.50 mm)
- white mark
- nominal size: 59.971 - 59.976 mm
- size 1st class: 59.721 - 59.726 mm (reduction by 025 mm)
- size 2nd class: 59.471 - 59.476 mm (reduction by 0.50 mm)
Axial clearance of the crankshaft:
- nominal 0.080 mm;
- maximum 0.163 mm.
Radial clearance of crankshaft main bearings:
- nominal 0.020 mm;
- maximum 0.058 mm.
Engine crankpin diameter «M54»:
- nominal size: 44.975-44.991 mm;
- 1st repair size: 44.725-44.741 mm;
- 2nd repair size: 44.475-44.491 mm;
Radial clearance of crankshaft connecting rod bearings:
- nominal 0.020 mm;
- maximum 0.055 mm.
The maximum allowable ovality of the surfaces of the main and connecting rod journals is not more than 0.003 mm.