2.11. Block of cylinders


Remove a head of cylinders, a gear belt, a forward cover, a flywheel, pistons and a bent shaft.


Block of cylinders


  1. Remove the remains of laying, sealant, dirt, oil, lubricant and other alien materials from the block of cylinders of the engine. Visually check the block of cylinders for lack of a rust, corrosion, cracks and other defects.
  1. Measure diameters of cylinders in the opposite directions (And yes In), in three planes on height of cylinders (1, 2 and 3).
  1. If diameters of cylinders exceed admissible values, have ovality or conicity or the surface of cylinders is damaged, or has development, the block of cylinders needs to be chiseled and otkhoningovat, and also to install new pistons and piston rings of the repair size.

Nominal diameter of the cylinder: 83 0,03 mm
Conicity of the cylinder: no more than 0,01 mm

  1. If in the top part of the cylinder there is a step, cut off it the special tool.
  1. As spare parts pistons of four increased sizes are delivered: 0,25, 0,5, 0,75 and 1,00 mm. When boring cylinders to the next increased size sustain a gap between the piston and the cylinder and be convinced that pistons have the same increased size. It is necessary to take standard measurement of outer diameter of the piston at distance 2 mm from a skirt and perpendicular to persistent surfaces. A gap between the piston and the cylinder: 0,069–0,091 mm.
  1. Check the block of cylinders for absence of damage and cracks.
  2. Clear the interfaced surfaces of a head of the block of cylinders and the block of cylinders of the laying remains. A metal ruler and the probe in six directions check planeness of the interfaced surface of the block of cylinders.

Deviation from planeness:

– on width: 0,042 mm;
– on length: 0,096 mm;
– on diagonal: 0,012 mm.

Maximum permissible deviation from planeness: 0,1 mm.

The Privalochny surface for laying of the block of cylinders after regrinding has to reduce height of the block of cylinders of no more than –0,2 mm.

Boring of cylinders


  1. Pistons of the increased size which be used will have to be defined on the basis of the largest diameter of an opening of the cylinder.
Increase in the size
0,25 mm
0,50 mm
0,75 mm
1,00 mm

Marking is beaten out on the piston bottom.

  1. Measure the outer diameter of the piston.
  2. On the basis of the measured size determine the amount of boring. The amount of boring = Diameter of the piston is 0,02 mm (honingovaniye size).
  3. Chisel each of cylinders to the settlement size.

For an exception of change of the size from temperature in the course of a honingovaniye, process cylinders in the following sequence: No. 2, No. 4, No. 1 and No. 3.

  1. Honinguyte cylinders before obtaining the required settlement diameter (outer diameter of the piston a gap).
  2. Check a gap between the piston and the cylinder.

When boring, chisel all cylinders to one increased size. Do not chisel only one cylinder to the increased size.


Establish details in the following sequence:

  1. Bent shaft
  2. Flywheel
  3. Piston
  4. Cylinder block head
  5. Gear belt
  6. Forward cover