Assembling the crankshaft with flywheel and clutch and installing it in the cylinder block

When installing the flywheel, the fastening nuts must be tightened evenly with a force of 7.6-8.3 kgm

The runout of the friction plane of the flywheel is no more than 0.15 mm at a radius of 165 mm.

If the runout exceeds 0.15 mm, the assembly must be dismantled.

The bearing of the guide end of the drive shaft of the gearbox must be filled with UTV 1-13 grease and installed in the crankshaft seat using a special mandrel.

When installing the clutch, it must be ensured that the axis of the driven disk coincides with the axis of the crankshaft.

The bolts securing the clutch cover to the flywheel must be evenly tightened in the order shown in fig. 1.

The tightening torque of the bolts should be within 2-3 kgm.

The crankshaft complete with flywheel and clutch must be dynamically balanced.

Before balancing, check the freedom and ease of rotation of the disc by disengaging the clutch and moving the release levers by 11.7 mm.

In this case, the size from the working surface of the flywheel to the upper heads of the pull levers should be within 53-54.5 mm.

In the absence of free rotation of the disk, as well as in case of deviation in size, the assembly must be disassembled.

Before balancing, fill the internal cavities of the crankshaft with spindle oil, put a balancing weight of 2237 g on each crankpin on the crankpins.

Permissible imbalance is 70 gsm.

Imbalance is to be eliminated by drilling metal on the outer diameter of the flywheel with a drill with a diameter of 8 mm to a depth of no more than 10 mm, maintaining a distance between holes of at least 11 mm.

Balancing should be carried out with an initial imbalance of no more than 180 gsm. With a greater imbalance, the assembly must be unstacked.

Before installing the crankshaft in the cylinder block, all mating surfaces must be thoroughly wiped.

The oil passages of the crankshaft and block must be blown out with compressed air.

Main bearing shells must be lubricated with engine oil.

The size of the main bearing shells must match the size of the crankshaft main journals.

The tightening torque of the nuts of the studs of the main bearing caps must correspond to 11-12 kgm.

The crankshaft axial clearance, measured between the thrust bearing front washer and the steel thrust washer, should be between 0.075-0.175 mm.

The axial clearance is adjusted by selecting the rear washer of the thrust bearing.

The nominal and repair dimensions of the front and rear thrust bearing washers are given in Table. 1.

With the main bearings fully tightened, the crankshaft must turn freely by the flywheel by hand.