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
      3.1.1. Masses and transfer numbers
      3.1.2. Operational liquids
      + 3.1.3. Changes in a car design from 1984 to 1986.
      - 3.1.4. Changes in a car design from 1987 to 1989.
         3.1.4.1. OHC engine
         + 3.1.4.2. Dm3 CVH 1,8 engine
         - 3.1.4.3. DOHC engine
            - 3.1.4.3.1. Technical characteristics
               3.1.4.3.1.1. Head of the block of cylinders of the engine
               3.1.4.3.1.2. Block of cylinders of the engine
               3.1.4.3.1.3. Krivoshipno-shatunny mechanism
               3.1.4.3.1.4. Gazoraspredeleniye system
               3.1.4.3.1.5. Greasing system
               3.1.4.3.1.6. Cooling system
               3.1.4.3.1.7. Fuel system
               3.1.4.3.1.8. Ignition system
               3.1.4.3.1.9. Tightening moments
         + 3.1.4.4. Service and repair
         + 3.1.4.5. Coupling
         3.1.4.6. Mechanical five-speed transmission of type N
         + 3.1.4.7. Mechanical five-speed transmission of MT 75 type
         3.1.4.8. Automatic transmission
         3.1.4.9. Forward suspension bracket
         + 3.1.4.10. Brake system
         + 3.1.4.11. Electric equipment
         3.1.4.12. General data
      + 3.1.5. Changes in a car design with 1990 till February, 1993.
   + 3.2. Cars with diesel engines
+ 4. Engines
+ 5. Coupling
+ 6. Transmissions
+ 7. Driveshaft and back bridge
+ 8. Steering
+ 9. Suspension brackets
+ 10. Brake system
+ 11. Body
+ 12. Electric equipment






3.1.4.3.1.1. Head of the block of cylinders of the engine
GENERAL INFORMATION

The head of the block of cylinders is cast under pressure from an easy alloy and has plug-in saddles of valves.

Designation: 20

Diameters of openings of plugs of bearings of cam-shafts: 26,00–26,03 mm.
Prevention

Grinding of the bottom surface of a head of the block of cylinders is inadmissible.

Laying of a head of the block of cylinders

Laying of a head of the block of cylinders is established without hermetic application.

Brand: Reinz.

Valves

Valves with a V-shaped arrangement, are inclined at an angle 20 ° to an axis of the cylinder and are put in action by two cam-shafts (inlet valves and final valves).

Sizes of valves (mm)

Valve type
The inlet
The final
Length
108,24-108,70
108,71-109,17
Diameter of a plate
42,5-42,7
37,9-38,1
Diameter of a core:
  – the nominal
7,025-7,043
6,999-7,017
  – repair 0,2
7,225-7,243
7,199-7,217
  – repair 0,4
7,425-7,443
7,399-7,417
  – repair 0,6
7,625-7,643
7,599-7,617
  – repair 0,8
7,825-7,843
7,799-7,817
Core gap in directing (mm)
0,020-0,069
0,046-0,095
Corner of a working facet
90 °
90 °

Working gap of valves

In the engine the hydraulic pushers providing automatic adjustment of a gap of valves are used.

Saddles of valves

The saddles of valves made of an alloy of steel and copper, are inserted into a head of the block of cylinders.

Sizes of saddles of valves

Saddle type Nest of the inlet valve Nest of the final valve
Corner of the top facet
60 °
60 °
Corner of a working facet
89 ° – 90 °
89 ° – 90 °
Width of a working facet
1,33-2,19
1,68-2,54
Corner of the bottom facet
140 °
140 °

Directing valves

Directing valves are made of cast iron, are inserted into a head of the block of cylinders and are inclined to a cylinder axis at an angle 120 °.

Diameters of openings directing (standard): 7,063-7,094 mm.

Springs of valves

It is used on two springs on each valve.

Characteristic of springs of valves

Spring type
The external
The internal
Free length (mm)
46,8
46,2
Internal diameter (mm)
24
17,5
Diameter of a wire (mm)
4,5
2,5
Number of working rounds
6,1
8