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: | |
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– engine of 2,8 l
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104,942
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– engine of 3,0 l
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104,980
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– engine of 3,2 l
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104,992
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Working volume:
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– engine of 2,8 l
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2799 cm3
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– engine of 3,0 l
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2960 cm3
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– engine of 3,2 l
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3199 cm3
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Diameter of cylinders:
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– engine of 2,8 l
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89,9 mm
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– engine of 3,0 l
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88,5 mm
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– engine of 3,2 l
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89,9 mm
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Piston stroke:
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– engine of 2,8 l
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73,5 mm
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– engine of 3,0 l
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80,2 mm
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– engine of 3,2 l
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84,0 mm
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Direction of rotation of a bent shaft of the engine
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Clockwise, if to look from a forward part of the car
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Arrangement of the cylinder No. 1
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From a driving chain
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Operating procedure of cylinders
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1 – 5 – 3 – 6 – 2 – 4
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Compression pressure:
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– minimum admissible pressure
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12,0 bars
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– the most admissible difference between two any cylinders
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1,5 bars
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Extent of compression
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10,0: 1
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Camshaft
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Axial side play:
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– nominal
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0,060 – 0,210 mm
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– maximum permissible
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0,150 mm
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Working gap of bearings of the camshaft:
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– nominal
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0,040 – 0,074 mm
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– maximum permissible
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0,150 mm
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The most admissible length of bolts of fastening of a head of the block of cylinders
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163,5 mm
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Lubrication system
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The minimum pressure of oil created by the oil pump:
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– on idling turns
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0,3 bars
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– at 3 000 rpm
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3,0 bars
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Bolts of fastening of a flywheel/plate of the drive
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Minimum diameter
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8,0 mm
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Maximum length
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22,5 mm
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Tightening moments
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Bolts of fastening of a cover of a head of the block of cylinders
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9 Nanometer
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Bolts of fastening of a pulley of a bent shaft to a nave
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32 Nanometer
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Bolt of fastening of a nave to a bent shaft:
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– a bolt with spring washers
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4 Nanometer
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– a bolt with a conic washer:
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• stage 1
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200 Nanometer
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• stage 2
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To tighten on a corner 90 °
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Bolts of fastening of an arm of the fan of a radiator
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21 Nanometer
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Bolts of fastening of the top cover of a driving chain
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21 Nanometer
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Bolts of fastening of the lower cover of a driving chain:
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– M6 bolts
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9 Nanometer
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– M8 bolts
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21 Nanometer
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Bolt of fastening of the mechanism of a tension of an auxiliary driving belt (M12)
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75 Nanometer
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Bolts of fastening of an intermediate pulley of an auxiliary driving belt
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30 Nanometer
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Bolt of fastening of a pulley of the mechanism of a tension of an auxiliary driving belt
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30 Nanometer
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Bolts of fastening of an asterisk of the camshaft operating final valves:
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– bolts with a six-sided head
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18 Nanometer
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– bolts with a head under a face key of T30
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22 Nanometer
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– bolts with a head under a face key of T40 (to establish only new bolts):
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• stage 1
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20 Nanometer
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• stage 2
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To tighten on a corner 60 °
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Bolts of fastening of an asterisk of the camshaft operating inlet valves:
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– bolts with a head under a face key of T30 without washer
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12 Nanometer
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– bolts with a head under a face key of T30 with edges without washer
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22 Nanometer
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– bolts with a head under a face key of T40 (to establish only new bolts):
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• stage 1
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20 Nanometer
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• stage 2
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To tighten on a corner 60 °
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Bolt of the bearing of the camshaft operating inlet valves:
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– a usual bolt with a washer
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7 Nanometer
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– a bolt with edges:
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• stage 1
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7 Nanometer
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• stage 2
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To tighten on a corner 90 °
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Nut of the mechanism of adjustment of the camshaft operating inlet valves (M20)
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65 Nanometer
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The cap-type nut of the mechanism of a tension of a driving chain
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40 Nanometer
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Case of the mechanism of a tension of a driving chain
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80 Nanometer
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Bolt of fastening of an intermediate asterisk of a driving chain (engine of 3,0 l)
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35 Nanometer
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Bolts of fastening of a cover of a head of the block of cylinders
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21 Nanometer
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Bolts of fastening of a head of the block of cylinders:
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– stage 1
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55 Nanometer
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– stage 2
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To tighten on a corner 90 °
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– stage 3
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To tighten on a corner 90 °
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Bolts of fastening of the transmission to the engine
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– mechanical transmission:
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• bolts of M10 x 40
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55 Nanometer
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• bolts of M10 x 90
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45 Nanometer
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– automatic transmission:
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• M10 bolts
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55 Nanometer
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• M12 bolts
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65 Nanometer
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Bolts of fastening of the oil pallet:
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– M6 bolts
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10 Nanometer
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– M8 bolts
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25 Nanometer
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Masloslivny stopper
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25 Nanometer
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Stopper of the safety valve of pressure of oil
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50 Nanometer
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Bolt of fastening of an asterisk of the oil pump
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32 Nanometer
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Bolts of fastening of the oil pump
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25 Nanometer
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Bolts of fastening of a maslopriyemny tube
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10 Nanometer
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Bolts of fastening of a flywheel / plate of the drive:
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– stage 1:
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• bolts with a back part of the reduced diameter
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30 Nanometer
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• usual bolts
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40 Nanometer
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– stage 2
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To tighten on a corner 90 °
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Bolts of fastening of a back cover of a bent shaft
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9 Nanometer
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Bolts of fastening of an arm of a support of the power unit
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55 Nanometer
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Bolts of fastening of support of the power unit to a cross-piece
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40 Nanometer
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Nuts of fastening of covers of a rod:
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– stage 1
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30 Nanometer
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– stage 2
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To tighten on a corner 90 – 100 °
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Bolts of fastening of covers of radical bearings:
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– stage 1
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55 Nanometer
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– stage 2
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To tighten on a corner 90 – 100 °
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Stopper of discharge of cooling liquid from the block of cylinders of the engine
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30 Nanometer
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