4. Repair of 6-cylinder petrol SOHC engines

Technical characteristic

The SOHC engine is an engine with one camshaft installed in a head of the block of cylinders.

Engine code:
– engine of 2,6 l
103.940
– engine of 3,0 l
103.980 or 103.983
Working volume:
– engine of 2,6 l
2597 cm3
– engine of 3,0 l
2960 cm3
Diameter of cylinders:
– engine of 2,6 l
82,9 mm
– engine of 3,0 l
88,5 mm
Piston stroke
80,2 mm
Direction of rotation of a bent shaft of the engine
Clockwise, if to look from a forward part of the car
Arrangement of the cylinder No. 1
From a driving chain
Operating procedure of cylinders
1–5–3–6–2–4
Compression pressure:
– minimum admissible pressure of compression
8,5 bars
– the most admissible difference between two any cylinders
1,5 bars
Extent of compression
9,2: 1

Camshaft

Axial side play:
– nominal
0,030 – 0,110 mm
– maximum permissible
0,150 mm
Working gap of bearings of the camshaft:
– nominal
0,040 – 0,082 mm
– maximum permissible
0,100 mm
The most admissible length of bolts of fastening of a head of the block of cylinders
108,4 mm

Lubrication system

Pressure created by the oil pump:
– on idling turns
0,3 bars
– at 3 000 rpm
3,0 bars

Bolts of fastening of a flywheel / plate of the drive

Minimum diameter
8,0 mm
Maximum length
22,5 mm

Tightening moments

Bolts of fastening of a cover of a head of the block of cylinders
15 Nanometer
Bolts of fastening of a pulley of a bent shaft / quencher of tortional fluctuations
300 Nanometer
Bolts of fastening of a casing of the fan of a radiator
21 Nanometer
Bolt of fastening of the drive of a rotor of the distributor to the camshaft:
– M7 bolt
16 Nanometer
– M8 bolt
21 Nanometer
Bolts of fastening of the top cover of a driving chain
21 Nanometer
Bolts of fastening of the lower cover of a driving chain:
– M6 bolt
9 Nanometer
– M8 bolt
21 Nanometer
Bolt of fastening of the mechanism of a tension of an auxiliary driving belt (M12)
75 Nanometer
Bolts of fastening of an intermediate pulley of an auxiliary driving belt
30 Nanometer
Bolt of fastening of a pulley of the mechanism of a tension of an auxiliary driving belt
30 Nanometer
Bolt of fastening of an asterisk of the camshaft
16 Nanometer
The cap-type nut of the case of the mechanism of a tension of a driving chain
50 Nanometer
The carving plug of fastening of the mechanism of a tension of a driving chain to a cover
30 Nanometer
Bolts of fastening of covers of bearings of the camshaft
21 Nanometer
Bolts of fastening of a head of the block of cylinders:
– stage 1
70 Nanometer
– stage 2
to tighten on a corner 90 °
– stage 3
to tighten on a corner 90 °
Bolts of fastening of the transmission to the engine:
– mechanical transmission:
   • bolts of M10 x 40
55 Nanometer
   • bolts of M10 x 90
45 Nanometer
– automatic transmission:
   • M10 bolts
55 Nanometer
   • M12 bolts
65 Nanometer
Bolts of fastening of the oil pallet:
– M6 bolts
10 Nanometer
– M8 bolts
25 Nanometer
Masloslivny stopper
25 Nanometer
Stopper of the safety valve of pressure of oil
50 Nanometer
Bolt of fastening of an asterisk of the oil pump
32 Nanometer
Bolts of fastening of the oil pump
25 Nanometer
Bolts of fastening of a flywheel / plate of the drive:
– stage 1:
   • standard flywheel
30 Nanometer
   • a flywheel with the doubled weight
40 Nanometer
– stage 2
to tighten on a corner 90 – 100 °
Bolts of fastening of a back cover of a bent shaft
10 Nanometer
Bolts of fastening of arms of support of the engine to the engine
55 Nanometer
Bolts of fastening of a cross-piece to an engine arm
40 Nanometer
Bolts of fastening of support of the engine
25 Nanometer
Nuts of fastening of covers of conrod bearings:
– stage 1
30 Nanometer
– stage 2
to tighten on a corner 90 – 100 °
Bolts of fastening of covers of radical bearings:
– stage 1
55 Nanometer
– stage 2
to tighten on a corner 90 – 100 °
Stopper of discharge of cooling liquid from the block of cylinders of the engine
30 Nanometer