Ford Sierra

1982-1993 of release

Repair and operation of the car

3.1.4.2.1.3. Krivoshipno-shatunny mechanism

GENERAL INFORMATION

Bent shaft

The bent shaft made of cast iron is dynamically balanced and leans on five radical bearings.

Diameters of radical necks:
– 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:
– nominal:	28,825 – 28,875 mm
– repair	28,675 – 28,725 mm
Radial gap in radical bearings	0,028 – 0,067 mm
Axial gap of a bent shaft	0,1 – 0,2 mm
Diameter of conrod necks:
– 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 inserts

Thin-walled inserts are used.

Internal diameter of inserts after installation in the block of cylinders:
– 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 steel and have double-T section.

Diameter of an opening of the lower head	46,890 – 46,900 mm
Diameter of an opening of a head	20,622 – 20,634 mm
Radial gap in conrod bearings	0,020 – 0,065 mm

Connecting rods

Thin-walled inserts are used.

Internal diameter of inserts after installation in the block of cylinders:
– 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 light alloy, have a flat bottom with deepenings for plates of valves.

Piston gap in the cylinder:
– nominal	0,02 – 0,04 mm
– repair	0,01 – 0,045 mm
Nominal diameters of pistons:
Standard:
– 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
Increased:
– group A	79,970 – 79,980 mm
– group B	79,980 – 79,990 mm
– group C	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 oil scraper.

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

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

– sealing: 0,30 – 0,50 mm;
– oil scraper: 0,40 – 1,40 mm.

Position of locks of rings on the piston: cuts of sealing rings have to be placed evenly on piston perimeter, and components of an oil scraper ring have to have the cuts located through everyone 120 °.

Flywheel

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

The gear wreath napressovyvatsya at a temperature of 260 ° –280 °C.