VAZ 2101, 2102
1. Specifications
2. Operation and service
3. The engine
3.1. Features of the device
3.2. Possible malfunctions of the engine, their reason and elimination methods
3.3. Removal and engine installation
3.4. Engine dismantling
3.5. Engine assemblage
3.6. Bench tests of the engine
3.7. Engine check on the car
3.8. The block of cylinders
3.9. Pistons and rods
3.9.1. Features of the device
3.9.2. Выпрессовка a piston finger
3.9.3. Clearing
3.9.4. Piston selection to the cylinder
3.9.5. Backlash check between the piston and a finger
3.9.6. Check of backlashes between piston flutes and rings
3.9.7. Backlash check between loose leaves of a rod and cranked shaft
3.9.8. The control of weight of pistons
3.9.9. Assemblage of shatunno-piston group
3.9.10. Check запрессовки a finger
3.9.11. Parallelism of axes of the bottom head of a rod and a piston finger
3.10. A cranked shaft and a flywheel
3.11. A head of cylinders and клапанный the mechanism
3.12. A camshaft and its drive
3.13. Cooling system
3.14. Greasing system
4. Fuel system
5. Ignition system
6. Start and gymnastics system
7. Transmission
8. A running gear
9. A steering
10. Brake system
11. An electric equipment
12. A body
13. Features of repair
14. Appendices



3.9.4. Piston selection to the cylinder

The settlement backlash between the piston and the cylinder (for new details) makes 0,05–0,07 mm. It is defined by a measurement of cylinders and pistons and provided with installation of pistons of the same class, as cylinders. As much as possible admissible backlash (at deterioration of details) – 0,15 mm.

If at the engine which was in operation, the backlash exceeds 0,15 mm it is necessary to pick up anew pistons to cylinders that the backlash was probably more close to settlement.

The prevention

On external diameter pistons are broken into five classes (A, B, C, D, E) through 0,01 mm, and on diameter of an aperture under a piston finger – on three categories through 0,004 mm. A class of the piston (letter) and an aperture category under a piston finger (figure) are branded on the piston bottom.

In spare parts pistons of classes A, C, E are delivered. It is enough these classes for piston selection to any cylinder as pistons and cylinders are broken into classes with some overlapping of the sizes.
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3.9.3. Clearing
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3.9.5. Backlash check between the piston and a finger