Take out all the pistons and remove the drive disc (or flywheel). Check crankshaft end play. If the permissible axial clearance is exceeded (0.080–0.246 mm), replace the crankshaft thrust bearing shells.
unscrew elements (1, fig. 5.75) fixing the main bearing and unscrew the dowel pins (bushings). Sequentially loosen and unscrew the bolts securing the main bearing caps.
Check cap markings (digitizing in circles, 1–3), if not, then apply. Main bearing caps 4 and 5 are not marked. The bearing cover is five-pointed. Remove main bearing caps (1–5, fig. 5.76). Take out the crankshaft and pay attention to its marking.
The installation of the crankshaft should be carried out in the reverse order, while it is necessary to replace the shells of the main and connecting rod bearings of the crankshaft. bolts (M10) Tighten the main bearing caps in two steps:
- 1st - torque 20 Nm (2.0 kgf·m);
- 2nd - tighten by an angle of 100°.
Do not wash off the coating of the bolts. Dowel pins (M8) and fixing elements of the main bearing cap tighten to 34 Nm (3.4 kgf·m).