2.8.16. Shatunno-piston group

Fig. 2.374. Piston and rod components: 1 – a bolt of fastening of a cover of a rod – 30 Нм + to tighten on +90 (1/4 about.); 2 – a rod cover; 3 – the bearing loose leaf; 4 – a rod; 5 – a piston finger; 6 – a lock ring; 7 – the piston; 8 – piston rings

Fig. 2.133. Check of a thermal backlash of a piston ring

Insert a ring from above, at right angle to a cylinder wall, to the bottom aperture of the cylinder, on distance about 15 mm from its edge. For this purpose use the piston without rings (fig. 2.133).

Fig. 2.375. Check of a backlash of piston rings on height

Before check clear a ring flute of the piston (fig. 2.375).

Measure by means of a micrometer for external measurements of 75-100 mm approximately in 10 mm from a bottom edge, at right angle to an axis of a piston finger.

The maximum deviation from the nominal size: 0,04 mm

By means of precision нутромера 50–100 mm measure in 3 places cross-wise in a cross-section direction And and a longitudinal direction In

Fig. 2.135. The scheme of check of diameter of the cylinder

(Fig. 2.135).

The maximum deviation from the nominal size: 0,08 mm

Fig. 2.376. Labels on the piston bottom

Mark adjusting position and an accessory to the cylinder with a chalk or a waterproof felt-tip pen on the piston bottom (fig. 2.376).

THE NOTE Do not use кернер or чертилку not to damage a covering of the bottom of the piston.

Adjusting position: the arrow specifies in the piston bottom towards belt pulleys.

Fig. 2.377. Adjusting labels on rods

Mark rods (fig. 2.377).

THE NOTE Rods replace only with the complete set. Shatunnye bearings in places do not change. Before removal mark with a paint rods and шатунные covers under the relation to each other and to the cylinder.

Fig. 2.378. A direction мысков on the ground surfaces of pairs rods

Мыски on the ground surfaces of pairs rods 1 and 2, 3 and 4. And also 5 and 6 should be are turned against each other (fig. 2.378).