Ford Sierra

1982-1993 of release

Repair and car operation



Ford Siyerra
+ 1.2. Car identification
+ 2. Maintenance
- 3. General data
   + 3.1. Cars with petrol engines
   - 3.2. Cars with diesel engines
      - 3.2.1. Changes in a car design from 1988 to 1993.
         3.2.1.1. Dm3 engine 2,3
         + 3.2.1.2. Dm3 engine 1,8
         + 3.2.1.3. Fuel system
         + 3.2.1.4. The repair which is not demanding removal of the engine
         3.2.1.5. Removal and engine installation
         3.2.1.6. Engine dismantling
         3.2.1.7. Check of details
         3.2.1.8. Check of gaps of a cranked shaft and rods
         3.2.1.9. Engine assembly
         3.2.1.10. Greasing system
         3.2.1.11. Cooling system
         3.2.1.12. Coupling
         3.2.1.13. Mechanical five-speed transmission of MT 75 type
         3.2.1.14. Power shaft and back bridge
         3.2.1.15. Steering system
         3.2.1.16. Forward suspension bracket
         3.2.1.17. Brake system
         3.2.1.18. Electric equipment
         3.2.1.19. General data
+ 4. Engines
+ 5. Coupling
+ 6. Transmissions
+ 7. Driveshaft and back bridge
+ 8. Steering
+ 9. Suspension brackets
+ 10. Brake system
+ 11. Body
+ 12. Electric equipment





3.2.1.8. Check of gaps of a cranked shaft and rods

GENERAL INFORMATION

Loose leaves of the first radical bearing (from a drive of system of a gazoraspredeleniye) have the bigger size, than loose leaves of other bearings, and both have an oil flute. In other bearings loose leaves from the block of cylinders have an oil flute, and from a cover have a smooth surface.

Check of radial gaps

The radial gap is measured in radical and shatunny bearings of a cranked shaft by means of special measuring cores of Plastigage from an artificial material. The measuring core laid along a neck (radical or shatunny) and clamped in the bearing is exposed to flattening. The radial gap in the bearing can be defined (on the basis of the corresponding scale on packing of measuring cores) depending on width of the deformed core.

Measurement conditions by means of measuring cores of Plastigage:

  – necks and loose leaves should be dry and are carefully fat-free;
  – the cranked shaft should not change the situation in process of installation and extraction of measuring cores;
  – the measuring core should be laid in half of the loose leaf, at bigger distance from an oil opening in the loose leaf or a shaft neck;
  – covers of bearings should be established manually, and their bolts should be tightened by the corresponding moment; it is impossible to strike blows to covers;
  – it is necessary to tighten only a bearing cover in which the radial gap is measured; it is impossible to measure gaps in all radical bearings at the same time.

PERFORMANCE ORDER
1. To establish loose leaves on radical bearings in the block of cylinders of the engine and to establish in them a cranked shaft.
2. To lay on the first radical neck a measuring core of Plastigage.
3. To establish a cover of the radical bearing together with the loose leaf and to tighten bolts of fastening the corresponding moment.
4. Carefully to uncover the bearing and to measure by means of a scale delivered together with measuring cores, width of the deformed measuring core and on the basis of the table or the schedule to define a radial gap in the bearing.
5. To compare the measured value to necessary size of a gap (see subsection 3.2.1.2.4). If the measured gap exceeds admissible value, it is necessary to use repair loose leaves.
6. In the similar way to measure a gap in other radical and shatunny bearings.

Provrka of an axial gap

PERFORMANCE ORDER
1. After installation of a cranked shaft in the block of cylinders it is necessary to establish persistent half rings of a cranked shaft (oil flutes should be directed outside of the radical bearing), covers of bearings and to tighten their fastening by the corresponding moment.
2. To rest a measuring tip of the indicator of hour type against an end face of a cranked shaft and to measure its axial gap.
3. To compare the measured values to necessary sizes (see subsection 3.2.1.2.4).Если the gap exceeds admissible value, it is necessary to use repair persistent half rings respectively bigger thickness.

Check of piston rings and piston gap in the cylinder

PERFORMANCE ORDER
1. After removal of rings from pistons it is necessary to measure their gap in piston flutes, and after installation in cylinders in which they stood earlier, to measure width of the lock (gap) between their ends (see subsection 3.2.1.2.4).
2. To measure diameters of cylinders and diameters of pistons (in a directing part, openings of a piston finger are lower) at right angle to an axis of a piston finger. The piston gap is equal in the cylinder to a difference of these two measurements.
3. By means of the special adaptation to establish rings on pistons so that inscriptions (or designations) were directed towards a piston bottom. Cuts of rings to arrange at an angle about 120 °.