Ford Sierra

3.2.1.2.4. The Krivoshipno-shatunnyj mechanism

THE GENERAL DATA

The krivoshipno-shatunnyj mechanism

1 – a cranked shaft, 2 – an intermediate shaft, 3 – loose leaves of radical bearings of a cranked shaft, 4 – persistent half rings of a cranked shaft, 5 – a pulley, 6 – covers of radical bearings, 7 – a rod, 8 – a cover of a rod, 9 – loose leaves шатунных bearings, 10 – the piston, 11 – piston rings, 12 – a lock spring ring, 13 – a piston finger, 14 – the plug of a head of a rod

Cranked shaft

The cranked shaft is made of pig-iron together with восемью counterbalances and leans against 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 шатунных 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 backlash of radical bearings of a cranked shaft	0,015 – 0,062 mm
Axial backlash 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 result 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

Rods with four distances between axes of apertures of a head and the basis for maintenance of one degree 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 apertures 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 outside a system drive timing.

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

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

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

 – Group And: 129,880–129,940 mm;
 – Group In: 129,941–130,000 mm;
 – Group With: 130,011–130,060 mm;
 – Group D: 130,061–130,120 mm.

Loose leaves шатунных bearings

Thin-walled loose leaves. The manufacturer does not result 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

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 And	82,460 – 82,475 mm
• group In	82,475 – 82,490 mm
• group With	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 backlash in the cylinder:
– Groups And and D	0,025 – 0,055 mm
– Groups E and F	0,021 – 0,054 mm
Выступание in ВМТ a piston bottom 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: a cut upwards.

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

Piston rings

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

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

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

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

Backlash in a piston flute:

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

Flywheel

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