The design of the crankshaft is shown in Figure 6.5.
Crankshaft journal diameter
Crankshaft journal diameter:
yellow 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)
green label
- nominal size - 59.970 - 59.976 mm
- size 1st class - 59.720 - 59.726 mm (reduction by 0.25 mm)
- size 2nd class - 59.470 - 59.476 mm (reduction by 0.50 mm)
white mark
- nominal size - 59.964 - 59.969 mm
- size 1st class - 59.714 - 59.719 mm (reduction by 0.25 mm)
- size 2nd class - 59.464-59.469 mm (reduction by 0.50 mm)
Axial clearance of the crankshaft, when measured on the middle support:
- nominal - 0.080 mm;
- maximum - 0.234 mm.
Radial clearance of crankshaft main bearings:
- nominal - 0.019 mm;
- maximum - 0.052 mm.
Diameter of connecting rod journals of the crankshaft
Diameter of connecting rod journals of the crankshaft:
- 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, no more than 0.003 mm.
Crankshaft bearing shells
Inserts of main and connecting rod bearings - bimetallic three-layer.
Radial clearance between bearing shells and crankshaft main/conrod journals:
- nominal - 0.020 mm
- maximum allowable - 0.055 mm.
Permissible runout of the middle journal of the crankshaft mounted on prisms is not more than 0.15 mm.
Thrust bearing size:
- nominal width - 25.0 mm;
- 1st repair size - 25.2 mm;
- 2nd repair size - 25.4 mm;
- tolerance from +0.053 to +0.020 mm.
If the clearances are greater than the maximum allowable, the bearing shells on the crankshaft journals must be replaced. If the crankshaft journals are worn out, they must be ground to the nearest repair size, and the liners should be replaced with repair ones (increased thickness).
Flywheel
The flywheel is attached to the crankshaft flange with eight bolts. After removing the flywheel, replace the bolts of its fastening with new ones, with a preliminary application of a locking compound to their threaded part. Due to the presence of a centering pin, the flywheel is installed in only one position. The starter ring gear, before being pressed onto the flywheel, is heated to a temperature of 220-250°C. Tighten new flywheel bolts each time with torque:
- under the manual transmission - 105 N·m (10.5 kgf·m);
- under automatic transmission - 120 N·m (12.0 kgf·m).
Permissible runout of the flywheel, when measured along the outer circumference, no more than - 0.40 mm.
Vibration damper
Structural version of the torsional vibration damper (2) shown in Figure 6.5.
It has a diameter of 235 mm. Marking color - black. Permissible axial runout, no more than 0.30 mm. Permissible ovality is not more than 0.20 mm.
Fastening is carried out each time with new bolts (1) type Torx - М10х86 (4 things.), in three steps - with a torque of 40 Nm + 60°+ 60°.