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. Dm3 engine 2,3
         - Dm3 engine 1,8
   Technical characteristics
   Head of the block of cylinders
   Block of cylinders
   Krivoshipno-shatunny mechanism
   Gazoraspredeleniye system
   Greasing system
   Cooling system
   Fuel system
   Tightening moments
   Engine adjustment
         + Fuel system
         + The repair which is not demanding removal of the engine Removal and engine installation Engine dismantling Check of details Check of gaps of a cranked shaft and rods Engine assembly Greasing system Cooling system Coupling Mechanical five-speed transmission of MT 75 type Power shaft and back bridge Steering system Forward suspension bracket Brake system Electric equipment 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 Krivoshipno-shatunny mechanism


Krivoshipno-shatunny mechanism

1–cranked shaft,

2–intermediate shaft,

3–loose leaves of radical bearings of a cranked shaft,

4–persistent half rings of a cranked shaft,


6–covers of radical bearings,


8–cover of a rod,

9–loose leaves of shatunny bearings,


11-piston rings,

12-lock spring ring,

13-piston finger,

14-plug of a head of a rod

Cranked shaft

The cranked shaft is made of cast iron together with eight counterbalances and leans on five radical bearings.

Diameter of radical necks:
  – the nominal
53,970-53,990 mm
  – repair-0,25
53,720-53,740 mm
  – repair-0,50
53,470-53,490 mm
Diameter of shatunny necks:
  – the nominal
48,970-48,990 mm
  – repair-0,25
48,720-48,740 mm
  – repair-0,50
48,470-48,490 mm
Width of the average radical bearing:
  – the nominal
31,070-31,130 mm
  – the repair
32,070-32,130 mm
Radial gap of radical bearings of a cranked shaft
0,015-0,062 mm
Axial gap of a cranked shaft
0,093-0,306 mm
The maximum moment of a friction in radical bearings of a cranked shaft (without the established knots the piston rod)
10 Nanometers

Loose leaves of radical bearings

Loose leaves thin-walled. The manufacturer does not give the sizes of loose leaves.
As spare details loose leaves nominal and repair are delivered: reduced by 0,25 mm and 0,50 mm.


Rods with four distances between axes of openings of a head and the basis for providing one extent of compression in all cylinders of the engine are made. Designations "And", "In", "With" and "D", put on a lateral surface of covers of rods, define selective group of distance between axes of openings of a head and the basis.

Method of installation of a rod concerning the block of cylinders: the letter "F" put on a lateral surface of a rod, should be from a drive of system of a gazoraspredeleniye.

Diameter of an opening of a nest of the loose leaf of the shatunny bearing: 52,000–52,020 mm.

Diameter of an opening in the plug of a head of a rod: 26,012–26,020 mm.

Distance between axes of openings of a head and the rod basis:

 – group A: 129,880–129,940 mm;
 – group B: 129,941–130,000 mm;
 – group C: 130,011–130,060 mm;
 – group D: 130,061–130,120 mm.

Loose leaves of shatunny bearings

Thin-walled loose leaves. The manufacturer does not give the sizes of loose leaves. As spare details loose leaves nominal and repair are delivered: reduced by 0,25 mm and 0,50 mm.


Pistons from an easy alloy with the filled-in steel insert are used.

Diameters of pistons (measured at right angle to an axis of a piston finger):
  – the nominal:
     • group A
82,460-82,475 mm
     • group B
82,475-82,490 mm
     • group C
82,620-82,635 mm
     • group D
82,635-82,650 mm
  – the repair:
     • group E (+0,5 mm)
82,961-82,979 mm
     • group F (+1,0 mm)
83,461-83,479 mm
Piston gap in the cylinder:
  – groups A and D
0,025-0,055 mm
  – groups E and F
0,021-0,054 mm
Vystupaniye in VMT of a bottom of the piston over the top plane of the block of cylinders
0,50-0,84 mm

Piston fingers

The finger rotates in the piston and the plug of a head of a rod (a so-called floating finger) and is fixed from longitudinal moving by two spring lock rings.

Installation of lock rings in a piston flute: cut up.

External diameter of a finger: 25,996–26,000 mm.

Piston rings

Each piston has three rings: two sealing and one maslosjemny.

Installation method: the inscription "Top" (top) is directed towards a piston bottom.

Width of the lock (cut) of the ring located in the cylinder:

 – top ring (sealing): 0,35–0,50 mm;
 – average ring (sealing): 0,35–0,50 mm;
 – bottom ring (maslosjemny): 0,25–0,45 mm.

Gap in a piston flute:

 – top ring (sealing): 0,090–0,122 mm;
 – average ring (sealing): 0,050–0,082 mm;
 – bottom ring (maslosjemny): 0,030–0,065 mm.


Radial palpation: 0,13 mm.
Number of teeths of a wreath: 135.