Ford Sierra

3.1.4.3.1.3. The Krivoshipno-shatunnyj mechanism

THE GENERAL DATA

Cranked shaft

The cranked shaft is shaped together with counterbalances and leans on five radical bearings.

The axial backlash is regulated by thickness of persistent half rings on the average the radical bearing.

Diameters of radical necks
The nominal:
– A sign yellow	54,980 – 54,990 mm
– A sign red	54,990 – 55,000 mm
Reduced (a sign green)	54,730 – 54,750 mm
Radial backlash in radical bearings	0,011 – 0,048 mm
Axial backlash of a cranked shaft	0,090 – 0,300 mm
Thickness of persistent half rings:
– The nominal	2,301 – 2,351 mm
– Repair (a sign yellow)	2,491 – 2,541 mm
Diameter шатунных necks:
– The nominal	50,890 – 50,910 mm
– Reduced (a sign green)	50,640 – 50,660 mm

Radical loose leaves

The semiloose leaves located in the block of cylinders, have an aperture and a flute for oil.

Internal diameter of loose leaves after installation in the block of cylinders:
– The nominal	55,001 – 55,038 mm
– Repair-0,05	54,951 – 54,988 mm
– Repair-0,25	54,751 – 54,788 mm
– Repair-0,50	54,501 – 54,538 mm
– Repair-0,75	54,251 – 54,288 mm

Rods

Rods are shaped from a steel and have двутавровое section of a rod and a straight line of a socket of the bottom head. The aperture serves in the bottom head of a rod for dispersion of oil in the piston for its cooling and greasing, and also for cooling of a piston finger and a rod head. Rods depending on weight are divided into four groups (And, In, With, D). Rods in the engine should belong to one group.

Diameter of an aperture of the bottom head	53,890 – 53,910 mm
Diameter of an aperture of a head	20,589 – 20,609 mm
Radial backlash in шатунных bearings	0,006 – 0,060 mm

Shatunnye loose leaves

Internal diameter of loose leaves after installation in a rod:
– The nominal	50,916 – 50,950 mm
– Repair-0,025	50,891 – 50,925 mm
– Repair-0,25	50,666 – 50,700 mm
– Repair-0,50	50,416 – 50,450 mm
– Repair-0,75	50,166 – 50,200 mm
– Repair-1,00	49,916 – 49,950 mm
Axial backlash of a rod (on cranked to a shaft)	0,090 – 0,310 mm

Pistons

Pistons are cast from an easy alloy, have a full shirt and the shifted axis of an aperture of a piston finger.

Installation method: the arrow should be at the bottom directed towards a system drive timing.

Nominal diameters of pistons:
– Group 1	85,970 – 85,980 mm
– Group 2	85,980 – 85,990 mm
Repair diameters of pistons:
– The standard	85,980 – 86,000 mm
– Repair 0,15	86,130 – 86,150 mm
– Repair 0,50	86,470 – 86,490 mm
Piston backlash in the cylinder:
– The nominal	0,020 – 0,040 mm
– The repair	0,010 – 0,040 mm

Piston rings

Each piston has three rings:

  – The first (top) – sealing бочкообразное;
  – Second (average) – sealing conic;
  – The third (bottom) – маслосъемное (from three parts with spring экспандером).

Backlash of the lock of rings (placed in the cylinder):
– The first sealing	0,30 – 0,60 mm
– The second sealing	0,50 – 0,80 mm
– маслосъемное	0,40 – 1,50 mm

Piston fingers

The fingers made of a steel, запрессованы in a head of a rod also rotate in piston naves.

Installation method: after heating of a rod to temperature 260 °–300 ° With.

Length:	63,4 mm
Diameter:
– A designation white colour	20,622 – 20,625 mm
– A designation red colour	20,626 – 20,628 mm
– A designation blue colour	20,628 – 20,631 mm
– A designation yellow colour	20,631 – 20,634 mm
Backlash in piston naves	0,008 – 0,014 mm
Tightness in a rod head	0,018 – 0,039 mm

Flywheel

The flywheel is screwed on a cranked shaft by six asymmetrically located bolts.