2.8. Repair of a head of cylinders

Dismantling

 PERFORMANCE ORDER

  1. In the sequence shown in the drawing for 2–3 passes turn out bolts of fastening of a head of the block of cylinders.
  1. Special adaptation 09222 - 27300 squeeze a spring of the valve and remove crackers from a valve core. Slowly release adaptation squeezing a spring and remove a valve spring, a plate springs and the valve from a head of the block of cylinders.

For storage of valves prepare the numbered plastic bags or containers.

  1. Passatizhami remove a maslootrazhatelny cap.

Do not reuse a maslootrazhatelny cap.

Check

Head of the block of cylinders

 PERFORMANCE ORDER

  1. Examine a head of the block of cylinders on absence of damage, cracks, leak of oil and cooling liquid. If necessary, replace a head of cylinders.
  2. Remove scale, sealant and a deposit. Compressed air blow channels for lubricant.
  1. Metal ruler and the probe in six directions check planeness of a head of the block of cylinders. If necessary, pereshlifuyta head of the block of cylinders.

Standard deviation from planeness:

– on width of 0,03 mm;
– on length of 0,09 mm;
– on the diagonal of 0,012 mm.

Valves

 PERFORMANCE ORDER

  1. Wire brush clear the valve.
  1. Examine each valve on existence of wear, damages and deformation in zones A and B and, if necessary, repair or replace it. If the end face of a core is corroded or worn-out, as required restore facets. This restoration has to be limited to the minimum removal of metal.

Also check thickness of working edges.

Thickness of a working edge of the valve:

Inlet valves: 1,16 mm
Final valves: 1,30 mm

Valve spring

 PERFORMANCE ORDER

  1. Examine each spring of the valve on lack of cracks and damages. Measure spring length in a free state.
  1. Establish a spring on a flat horizontal surface and measure a deviation of the top part of a spring from the vertical plane.

Spring length without loading: 39,14 mm
Spring length under loading of 21,4 kg: 32 mm
Spring tolerance from the vertical plane: no more than 1,5 °
Maximum permissible reduction of length: –1 mm
Maximum permissible deviation of a spring from the vertical plane: no more than 4 °

The directing valve plugs

Check a gap between a core and the directing valve plug. If the gap exceeds maximum permissible value, replace the directing valve plug with the plug of the increased repair size.

Gap between a core and the directing valve plug:

Inlet valves: 0,022–0,067 mm
Final valves: 0,005–0,095 mm

Maximum permissible gap between a core and the directing valve plug:

Inlet valves: 0,1 mm
Final valves: 0,15 mm

Plug-in saddle of the valve

Check a valve saddle for existence of an overheat and violation of the working surface contacting to a plate of the valve. If necessary repair or replace a valve saddle.

Before replacement or repair of a saddle of the valve check wear of the directing valve plug. If the directing plug of the valve is worn-out, replace it.

Assembly

  1. Before installation clear details.
  2. Apply a thin film of engine oil on all surfaces of sliding.

 PERFORMANCE ORDER

  1. Establish a spring saddle.
  2. Using special adaptation 09222 - 27200, establish a maslootrazhatelny cap.
  1. Do not reuse old maslootrazhatelny caps.
  2. The wrong installation of a maslootrazhatelny cap adversely influences its working edge due to eccentricity and leads to leak of engine oil via the directing valve plugs. At installation be careful not to overwind a maslootrazhatelny cap.
  1. Oil a valve core engine and install the valve. At installation of the valve do not make great efforts not to damage a maslootrazhatelny cap. Check smoothness of movement of the valve.
  1. Establish springs and holders of springs. Springs need to be established by the party enameled to holders of springs.
  1. Special adaptation 09222 - 27300 squeeze a spring. Establish crackers and remove the special device for compression of a spring.

At compression of a spring be convinced that the maslootrazhatelny cap is not clamped by the device for compression of a spring.

  1. Clear all privalochny surfaces of the block of cylinders and a head of the block of the cylinder.
  1. Determine thickness of laying of a head of cylinders:
    1. measure a vystupaniye of the piston installed in VMT on the relation from the interfaced surface of the block of cylinders;
    2. depending on piston vystupaniye size according to the table choose laying thickness. As the size of a vystupaniye of the piston average value from eight measurements is necessary. Even if one measurement exceeds admissible limits, thickness of laying needs to be chosen on the basis of measurement of a vystupaniye of this point.
  1. Establish new laying of a head of the block of cylinders so that the surface with marking was directed to a head of cylinders.
  1. In the sequence shown in the drawing tighten bolts of fastening of a head of cylinders. Inhaling moment: 50 N • to tighten m on a corner 120 °.

Vystupaniye
2,0 l
Value of an average vystupaniye of pistons
0,194–0,337 mm
0,337–0,440 mm
0,440–0,542 mm
Laying thickness
1,13±0,05 mm
1,23±0,05 mm
1,33±0,05 mm
Limit of each category
0,43 mm
0,53 mm
Identification tags
001
002
003