4.4.1. Check of technical condition
Remove piston rings and clear pistons of a deposit. On the surface of pistons there should not be рисок also zadir; otherwise replace pistons. Measure diameter of pistons.
Fig. 2.10. Measurement of diameter (D) piston at distance (d) from the lower end face of a skirt
Diameter of the piston is measured at d distance from the lower end face of a skirt (fig. 2.10)
and makes, mm:
for the GA14DE 7,5 engine
for the GA16DE 9,5 engine
for the SR20DE 11 engine
Check a gap between the piston and the cylinder by means of a set of flat probes or a rasschityta a gap by results of measurements of details. Be convinced of absence of damage of hairpins of rods, overheat traces. Check openings of the top and lower 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. When replacing the plug combine its opening for lubricant 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 the increased gap even at new piston rings install pistons of the repair size, pierce cylinders or replace the block of cylinders.