4.4.1. Check of a technical condition
Remove piston rings and clear of a deposit pistons. On a surface of pistons should not be рисок and задиров; otherwise replace pistons. Measure diameter of pistons.
Fig. 2.10. Measurement of diameter (D) piston at distance (d) from the bottom end face of a skirt
Diameter of the piston is measured at d distance from the bottom end face of a skirt (fig. 2.10)
and makes, mm:
for the engine GA14DE 7,5
for the engine GA16DE 9,5
for the engine SR20DE 11
Check a gap between the piston and the cylinder by means of a set flat щупов or рассчитйте a gap by results of measurements of details. Be convinced of absence of damages of hairpins of rods, overheat traces. Check openings of the top and bottom heads of a rod. In them there should not be damages.
Check a gap between a piston finger and the plug of the top head of a rod. In case of the raised gap replace a piston finger, the plug of a head of a rod or a rod. At replacement of the plug combine its opening for greasing with an opening in a rod head. Check gaps between piston rings and flutes. At a considerable deviation from the admission measure thickness of piston rings. If necessary replace rings and pistons. Check gaps in locks of rings. At much increased gap even at new piston rings establish pistons of the repair size, pierce cylinders or replace the block of cylinders.