Fig. 2.89 . Shatunno-porshnevaya group: 1–piston rings; 2–piston; 3–lock ring; 4–rod; 5–bearing loose leaf; 6–rod cover; 7–a bolt of 30 N · m + tighten on 1/4 turns (90 °); 8–block of cylinders; 9–piston finger

Check of a thermal gap of piston rings

Fig. 2.90 . Check of a thermal gap of piston rings

Drive a ring from above, at right angle to a cylinder wall, to the bottom opening of the cylinder, at distance about 15 mm from its edge. For this purpose use the piston without rings (fig. 2.90) .

Check of a gap of piston rings on height

Fig. 2.91 . Check of a gap of piston rings on height

Before check clear a ring flute ( fig. 2.91 .).

Check of diameter of the cylinder

Fig. 2.92 . Measurement of diameter of the piston

Measure approximately in 6 mm from bottom edge, at right angle to an axis of a piston finger (fig. 2.92) .

The tolerance from the nominal size of 0,04 mm is maximum

Fig. 2.93 . Scheme of measurement of diameter of the cylinder

Carry out measurements cross-wise in three places in the cross-section direction A and the longitudinal direction B (fig. 2.93) .

As much as possible tolerances from the nominal size of 0,08 mm.

NOTE It is forbidden to measure diameters of cylinders when the block of cylinders is fixed on a clamp of the engine and VAS 6095 transmission as incorrect results are in that case possible.

Sizes of pistons and cylinders

Installation of pistons by means of T10147 funnel

Only after that it is possible to establish pistons with rings.

Fig. 2.94 . Special funnel of T10147

NOTE When using for installation of the piston of a new funnel of T10147 at first it is necessary to carry out twice the piston with the oiled piston rings through it and if necessary to remove the appeared shaving (fig. 2.94) .

Manually push the piston into the oiled funnel of T10147. The flat party of the bottom of the piston should indicate a funnel pin (fig. 2. 95).

Holding a funnel (with the piston inserted into it) for the upper edge, push the piston inside, having pressed on it thumbs of both hands.

Push the piston so that he acted over bottom edge of a funnel approximately on 15 mm.

Fig. 2.95 . Scheme of installation of a special funnel of T10147

Put the piston in the corresponding cylinder. The funnel pin (fig. 2.95) should be turned to the middle of the block of cylinders.

Put a funnel on the block of cylinders and push the piston inside.