Ford Sierra

3.1.4.2.1.3. The Krivoshipno-shatunnyj mechanism

THE GENERAL DATA

Cranked shaft

The cranked shaft made of pig-iron is dynamically balanced and leans on five radical bearings.

Diameters of radical necks:
– The nominal	53,980 – 54,000 mm
– Repair-0,25	53,730 – 53,750 mm
– Repair-0,50	53,480 – 53,500 mm
– Repair-0,75	53,230 – 53,250 mm
Width of the basic bearing:
– The nominal:	28,825 – 28,875 mm
– The repair	28,675 – 28,725 mm
Radial backlash in radical bearings	0,028 – 0,067 mm
Axial backlash of a cranked shaft	0,1 – 0,2 mm
Diameter шатунных necks:
– The nominal	43,890 – 43,910 mm
– Repair-0,25	43,640 – 43,660 mm
– Repair-0,50	43,390 – 43,410 mm
– Repair-0,75	43,140 – 43,160 mm
– Repair-1,00	42,89 – 42,910 mm

Radical loose leaves

Thin-walled loose leaves are used.

Internal diameter of loose leaves after installation in the block of cylinders:
– The nominal	58,016 – 58,059 mm
– Repair-0,25	57,776 – 57,809 mm
– Repair-0,50	57,516 – 57,559 mm
– Repair-0,75	57,266 – 57,309 mm

Rods

Rods are shaped from a steel and have двутавровое section.

Diameter of an aperture of the bottom head	46,890 – 46,900 mm
Diameter of an aperture of a head	20,622 – 20,634 mm
Radial backlash in шатунных bearings	0,020 – 0,065 mm

Shatunnye loose leaves

Thin-walled loose leaves are used.

Internal diameter of loose leaves after installation in the block of cylinders:
– The nominal	43,919 – 43,960 mm
– Repair-0,25	43,669 – 43,710 mm
– Repair-0,50	43,419 – 43,460 mm
– Repair-0,75	43,169 – 43,210 mm
– Repair-1,00	42,919 – 42,960 mm

Pistons

Pistons are cast under pressure from an easy alloy, have a flat bottom with deepenings for plates of valves.

Piston backlash in the cylinder:
– The nominal	0,02 – 0,04 mm
– The repair	0,01 – 0,045 mm
Nominal diameters of pistons:
Cтандартные:
– Group 1	79,910 – 79,920 mm
– Group 2	79,920 – 79,930 mm
– Group 3	79,930 – 79,940 mm
– Group 4	79,940 – 79,950 mm
– Group 5	79,950 – 79,960 mm
– Group 6	79,960 – 79,970 mm
The increased:
– Group And	79,970 – 79,980 mm
– Group In	79,980 – 79,990 mm
– Group With	79,990 – 80,000 mm

Repair diameters of cylinders: are increased by 0,290 or 0,500 mm.

Piston rings

Each piston has rings: two sealing and one маслосъемное.

Sealing rings should be directed an inscription of "Torahs" towards a head of the block of cylinders.

Backlash of the lock of rings (placed in the cylinder):

  – The sealing: 0,30 – 0,50 mm;
  – маслосъемное: 0,40 – 1,40 mm.

Position of locks of rings on the piston: cuts of sealing rings should be placed in regular intervals on piston perimetre, and components маслосъемного rings should have the cuts located through each 120 °.

Flywheel

The flywheel is fixed on a flange of a cranked shaft by means of 6 bolts.

Gear wreath напрессовывается at temperature 260 °–280 ° With.