Pistons, cylinders 21 . Check the wear on pistons, piston rings and gudgeon pins . Replace these if necessary . Use a cylinder indicator gauge to measure the cylinder bores . The measurement of the biggest wear is made immediately beneath the edge of the upper dead center and crosswise the engine . The mea surement of the smallest wear is made at the lower dead center . As to the cylinder diameter, see "Technical Data" . Use a micrometer to measure the pistons . Piston diameter, see under "Technical Data" . 24 . Use piston ring pliers to install the piston rings . The marking of the rings (TOP or the mark of the manufacturer) must be turned upwards .
The height of the upper com pression ring : 1,75 mm ( .068898 in .) The height of the piston rings so that the gaps are turned 120 ° from each lower compression ring ; 2,00 mm ( .07874 in .) . Turn the other . 22 . Inserta new piston ring into the cylinderand measure the piston ring gap . As to the measurement, see under "Technical Data" . If necessary increase the gap, using a special file . Connecting rods 25 . Check the connecting rods for straightness and 23 . Measure the clearance of the piston rings in the piston ring grooves . Regarding the measurement, see under "Technical Data" . twisting .