Thoroughly clean the running surfaces of the liners and the corresponding crankshaft journal. Put a piece of plastic calibrated wire, equal in width to the insert, on the surface of the neck.
3, depending on the type of the checked neck, install a connecting rod with a cap or a main bearing cap on the neck and tighten the fastening nuts or bolts, respectively, tighten the nuts of the connecting rod bolts with a torque of 3.5 kgf·m, the bolts for fastening the main bearing caps with a torque of 6.5 kgf·m. Do not allow the crankshaft of the engine to rotate.
Carefully remove the cover and, using the scale printed on the package, determine the size of the gap by the flattening of the wire. More detailed information is given in the accompanying documentation of the gauge wire manufacturer.
The nominal design gap is 0.030-0.080 mm (maximum allowable 0.17 mm; for indigenous and 0.015-0.062 mm (maximum allowable 0.12 mm) for crankpins.
If the gap is greater than the limit, then replace the liners on these necks with new ones. If the crankshaft journals are worn out and are ground to a repair size, then replace the liners with repair ones (increased thickness).
Checking the dimensions of pistons and piston rings
Determine the degree of wear of the piston by measuring the diameter of 15 mm from the edge of the piston skirt perpendicular to the axis of the piston pin. The piston must be replaced if its diameter differs by more than 0.04 mm from the permissible values (see subsection «Design and specifications»).
Replace the piston rings or pistons if the gaps between the piston rings and grooves exceed the allowable values (see subsection «Design and specifications»).
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