4.19. Pistons and rods - survey

18.1 For removal of piston rings use the special tool

1. Accurately remove rings from pistons (18.1), trying not to scratch pistons.

18.2а piston Flutes can be cleared by means of the special tool

18.2б... Or a ring fragment

2. Remove traces of a deposit from a piston head. Clear flutes for piston rings (18.2а and 18.2б).

3. After removal of a deposit and adjournment clear pistons and rods solvent and dry up them.

4. Examine pistons on presence of cracks on a piston skirt, round a piston finger and flutes for piston rings.

5. Examine the piston on presence of scratches, corrosion or the burnt through areas.

18.6 Check up a lateral backlash of a ring in several places by means of a set щупов

6. Measure a lateral backlash of piston rings in several points (18.6).

18.7 Measure diameter of the piston to perpendicularly piston finger and in parallel it

7. Define a backlash between the piston and cylinder walls, having subtracted diameter of the cylinder from diameter of the piston. Measure diameter of the piston on 2 mm above the bottom edge of the piston to perpendicularly piston finger and in parallel it (18.7). If the backlash is too great,

8. Check up a backlash between the piston and a rod, having inclined the piston on a rod. If excessively free course is felt, address to experts for расточки the piston and a rod and installation of a new piston finger.

9. If the piston is necessary for removing from a rod, address to experts.

10. Examine rods on presence of cracks or other damages. Remove covers of rods, clear them and examine on presence of scratches. Replace loose leaves of bearings and establish covers into place.