The crankshaft of the engine is five-bearing, cast from cast iron with nodular graphite. 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 with the shafts. Crankshafts are divided into three size groups, marked with colored colorful marks (yellow, green and purple) on the cheeks in the region of the root necks. It is allowed to regrind the crankshaft bearings with their reduction to the repair dimensions of the 1st and 2nd classes.
Diameter of main journals of crankshafts of engines «N62»:
1.* Bearing bed
yellow label:
- nominal size - 69.974 - 69.980 mm;
- size 1st class - 69.724 - 69.730 mm (reduction by 0.25 mm);
- size 2nd class - 69.474 - 69.480 mm (reduction by 0.50 mm).
green label:
- nominal size - 69.967 - 69.972 mm;
- size 1st class - 69.717 - 69.723 mm (reduction by 0.25 mm);
- size 2nd class - 69.467 - 69.473 mm (reduction by 0.50 mm).
purple label:
- nominal size - 69.961 - 69.966 mm;
- size 1st class - 69.711 - 69.716 mm (reduction by 0.25 mm);
- size 2nd class - 69.461 - 69.466 mm (reduction by 0.50 mm).
Bed of bearings 2 - 5.
yellow label:
- nominal size - 69.984 - 69.990 mm;
- size 1st class - 69.734 - 69.740 mm (reduction by 0.25 mm);
- size 2nd class - 69.484 - 69.490 mm (reduction by 0.50 mm).
green label:
- nominal size - 69.977 - 69.983 mm;
- size 1st class - 69.727 - 69.733 mm (reduction by 0.25 mm);
- size 2nd class - 69.477 - 69.483 mm (reduction by 0.50 mm).
purple label:
- nominal size - 69.971 - 69.976 mm;
- size 1st class - 69.721 - 69.726 mm (reduction by 0.25 mm);
- size 2nd class - 69.471 - 69.476 mm (reduction by 0.50 mm).
Axial clearance of the crankshaft:
- nominal - 0.080 mm;
- maximum - 0.246 mm.
Radial clearance of crankshaft main bearings:
- nominal - 0.024 mm;
- maximum - 0.052 mm.
Thrust Bearing Width:
- nominal - 28.0 mm;
- size 1st class - 28.2 mm;
- the size of the 2nd class is 28.4 mm.
The maximum allowable runout on the middle main journal, when supported on journals 1 and 5, is no more than 0.15 mm.
The diameter of the connecting rod journals of the crankshaft of engines «N62»:
- nominal size - 54.00 mm;
- size 1st class - 53.75 mm;
- size 2nd class - 53.50 mm.
With execution tolerance from -0.009 mm to -0.025 mm.
Radial clearance of crankshaft connecting rod bearings (between bearings and crankshaft journal):
- nominal - 0.028 mm;
- maximum - 0.070 mm.
The maximum allowable ovality of the surfaces of the main and connecting rod journals is not more than 0.003 mm.