5. Repair of 6-cylinder petrol DOHC engines

Technical characteristic

The DOHC engine is an engine with two camshafts installed in a head of the block of cylinders.

Engine code:
– engine of 2,8 l
104,942
– engine of 3,0 l
104,980
– engine of 3,2 l
104,992
Working volume:
– engine of 2,8 l
2799 cm3
– engine of 3,0 l
2960 cm3
– engine of 3,2 l
3199 cm3
Diameter of cylinders:
– engine of 2,8 l
89,9 mm
– engine of 3,0 l
88,5 mm
– engine of 3,2 l
89,9 mm
Piston stroke:
– engine of 2,8 l
73,5 mm
– engine of 3,0 l
80,2 mm
– engine of 3,2 l
84,0 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
12,0 bars
– the most admissible difference between two any cylinders
1,5 bars
Extent of compression
10,0: 1

Camshaft

Axial side play:
– nominal
0,060 – 0,210 mm
– maximum permissible
0,150 mm
Working gap of bearings of the camshaft:
– nominal
0,040 – 0,074 mm
– maximum permissible
0,150 mm
The most admissible length of bolts of fastening of a head of the block of cylinders
163,5 mm

Lubrication system

The minimum pressure of oil 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
9 Nanometer
Bolts of fastening of a pulley of a bent shaft to a nave
32 Nanometer
Bolt of fastening of a nave to a bent shaft:
– a bolt with spring washers
4 Nanometer
– a bolt with a conic washer:
   • stage 1
200 Nanometer
   • stage 2
To tighten on a corner 90 °
Bolts of fastening of an arm of the fan of a radiator
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 bolts
9 Nanometer
– M8 bolts
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
Bolts of fastening of an asterisk of the camshaft operating final valves:
– bolts with a six-sided head
18 Nanometer
– bolts with a head under a face key of T30
22 Nanometer
– bolts with a head under a face key of T40 (to establish only new bolts):
   • stage 1
20 Nanometer
   • stage 2
To tighten on a corner 60 °
Bolts of fastening of an asterisk of the camshaft operating inlet valves:
– bolts with a head under a face key of T30 without washer
12 Nanometer
– bolts with a head under a face key of T30 with edges without washer
22 Nanometer
– bolts with a head under a face key of T40 (to establish only new bolts):
   • stage 1
20 Nanometer
   • stage 2
To tighten on a corner 60 °
Bolt of the bearing of the camshaft operating inlet valves:
– a usual bolt with a washer
7 Nanometer
– a bolt with edges:
   • stage 1
7 Nanometer
   • stage 2
To tighten on a corner 90 °
Nut of the mechanism of adjustment of the camshaft operating inlet valves (M20)
65 Nanometer
The cap-type nut of the mechanism of a tension of a driving chain
40 Nanometer
Case of the mechanism of a tension of a driving chain
80 Nanometer
Bolt of fastening of an intermediate asterisk of a driving chain (engine of 3,0 l)
35 Nanometer
Bolts of fastening of a cover of a head of the block of cylinders
21 Nanometer
Bolts of fastening of a head of the block of cylinders:
– stage 1
55 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 maslopriyemny tube
10 Nanometer
Bolts of fastening of a flywheel / plate of the drive:
– stage 1:
   • bolts with a back part of the reduced diameter
30 Nanometer
   • usual bolts
40 Nanometer
– stage 2
To tighten on a corner 90 °
Bolts of fastening of a back cover of a bent shaft
9 Nanometer
Bolts of fastening of an arm of a support of the power unit
55 Nanometer
Bolts of fastening of support of the power unit to a cross-piece
40 Nanometer
Nuts of fastening of covers of a rod:
– 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