2.4.2. Measurement of diameters of cylinders

For measurement of diameters of cylinders it is necessary display нутромер with which help it is possible to receive gaugings from the middle and the bases of cylinders. At its absence carrying out of the specified works is impossible. Use display нутромера, intended for measurement of diameters of cylinders, business uneasy enough, therefore is recommended to deliver the disassembled block of cylinders for measurements in repair shop. There will quickly establish degree of deterioration of the block of cylinders. Passed расточку the block of cylinders deliver together with pistons which in this case are marked according to numbering of cylinders.

Measurements of diameters of cylinders are spent in longitudinal and cross-section directions (fig. 65). Besides to measure diameters also it is necessary on distance of 10 mm from the top edge, 10 mm from the bottom edge and once in the middle. In total for diameter of each cylinder it is necessary on six measurements. All received values register and compared to specifications (see enc.).

Fig. 65. Measurement of diameter of the cylinder with the help стрелочного the indicator

Fig. 67. Measurement of diameter of the piston (on distance of 10 mm from the bottom edge of a skirt of the piston)

It is necessary to remember that расточка and хонингование should be spent on all cylinders. The deviation from the nominal sizes, equal 0,04 mm is supposed. Pistons of the repair sizes can be received according to the sizes specified in "Specifications". In total it is three sizes. Definitively diameter of the cylinder is defined by results of piston measurement (fig. 67): on distance of 10 mm from the bottom edge of a skirt of the piston and at right angle to an aperture under a piston finger. If at one piston the deviation from the basic size exceeds 0,04 mm the block of cylinders should be chiseled and хонинговать.

For backlash check to measure the piston and diameter of the cylinder as it is described, and to define a difference of the sizes on the cylinder. If the result exceeds 0,07 mm cylinders should be chiseled and хонинговать as it has reached limiting deterioration.