Opel Omega

since 1993-1999 release

Repair and operation of the car

Opel Omega
+ 1. Maintenance instruction
+ 2. Maintenance
- 3. Repair of engines
   + 3.1. SOHC engines of 2,0 liters
   + 3.2. DOHC engines of 2,0 liters
   - 3.3. 2,5 and 3,0 liters engines
      3.3.1. Technical characteristics
      3.3.2. Check of a compression
      3.3.3. Top Dead Point (TDP) of the N1 piston
      3.3.4. Covers of camshafts
      3.3.5. Pulley of a bent shaft
      3.3.6. Covers of a gas-distributing belt
      3.3.7. Gas-distributing belt
      3.3.8. Natyazhitel of a belt, asterisks and intermediate pulleys
      3.3.9. Epiploons of camshafts
      3.3.10. Camshafts and pushers
      3.3.11. Head of cylinders
      3.3.12. Oil pallet
      3.3.13. Oil pump
      3.3.14. Oil heater
      3.3.15. Flywheel and drive plate
      3.3.16. Epiploons of a bent shaft
      3.3.17. Fastenings of the engine and transmission
   + 3.4. Partition of all petrol engines
   + 3.5. 2,0 liters diesel engine
   + 3.6. 2,5 liters diesel six-cylinder engine
+ 4. Heating system and ventilation
+ 5. Fuel, exhaust systems
+ 6. System of start of the engine
+ 7. System of ignition
+ 8. Coupling
+ 9. Transmissions
+ 10. Main transfer, half shafts
+ 11. Brake system
+ 12. Suspension bracket and steering
+ 13. Body
+ 14. Body electric equipment

3.3.1. Technical characteristics

GENERAL INFORMATION

Engine type	Six-cylinder two-row with water cooling and two camshafts in each head
	2,5 l engine	3,0 l engine
Engine code	X25XE	X30XE
Diameter of the cylinder	81,6 mm	86,0 mm
Piston stroke	79,6 mm	85,0 mm
Volume	2498 ^cm3	2969 ^cm3
Maximum power	125 kW at 6000 rpm	155 kW at 6200 rpm
The maximum rotating moment	227 N of m at 3200 rpm	270 N of m at 3600 rpm
Sequence of operation of cylinders	123456 (the N1 cylinder is located from a gas-distributing belt of the right number of cylinders)
Direction of rotation of a bent shaft	Clockwise
Extent of compression	10,8: 1
Compression pressure:
nominal	12 15 bars
the maximum difference in pressure between two cylinders	1 bar
Camshaft
Cam height:
2,5 l	9,2 mm
3,0 l	10,0 mm
Lubrication system
Oil pump	Rotor type with the drive from a bent shaft
Minimum admissible pressure of oil idling (oil 80 temperature )	1,5 bars
Free wheeling of rotors of the oil pump:
internal rotor	less than 0,08 mm
external rotor	less than 0,10 mm

Moments of an inhaling, N. of m.

Bolts of a natyazhitel of an additional belt	35
Bolts of a dividing partition	8
Bolts of covers of bearings of the camshaft	8
Camshaft cover bolts	8
Camshaft sensor bolt	8
Camshaft asterisk bolt:
step 1	50
step 2	Tighten for 60
step 3	Tighten for 15
Rod cover bolt:
step 1	35
step 2	Tighten for 45
step 3	Tighten for 15
Bolts of a ventilating tube of the right block of cylinders	25
Bolt of an arm of the engine intended for fastening of the elevator	25
Bolts of the pump of cooling liquid	25
Bolts of a pulley of the pump of cooling liquid:
step 1	8
step 2	Tighten for 30
step 3	Tighten for 30
Bolts of a ventilating tube of a case of the engine	8
Bolts of a pulley of a bent shaft	20
Bolts of a rotor of the sensor of a bent shaft	15
Bolt of an asterisk of a bent shaft:
step 1	250
step 2	Tighten for 45
step 3	Tighten for 15
Bolts of a head of cylinders:
step 1	25
step 2	Tighten for 90
step 3	Tighten for 90
step 4	Tighten for 90
step 5	Tighten for 15
Bolts of a branch pipe of cooling liquid of a head of cylinders	30
Bolts of a drive plate:
step 1	65
step 2	Tighten for 30
step 3	Tighten for 15
Fastenings of the engine and transmission:
left and right support:
the nut fixing a support to a body	55
the nut fixing a support to its arm	40
the bolts fixing a support arm to the block of cylinders	60
shock-absorber bolts	40
back support:
the bolts fixing a support to the transmission	40
the nuts fixing a support to a cross-piece	20
the bolts fixing a cross-piece to a body	45
the bolts fixing the transmission to the engine:
the bolts fixing the transmission to the block of cylinders	60
the bolts fixing the transmission to a flange of the oil pallet	40
Flywheel bolts:
step 1	65
step 2	Tighten for 30
step 3	Tighten for 15
Bolts of the block of covers of radical bearings:
bolts of covers:
step 1	50
step 2	Tighten for 60
step 3	Tighten for 15
Fitting of the block of covers	8
The bolts (M8) fixing the block of covers to the block of cylinders	20
Oil heater:
cover bolts	20
cover nuts	30
bolts and nuts of connections of tubes of the oil heater	30
Oil filter	15
Screws of a cover of the oil pump	8
Fixing bolts of the oil pump:
M6 bolts with an original back cover of a gas-distributing belt:
initial moment of an inhaling	8
final moment of an inhaling	10
M6 bolts with the modified back cover of a gas-distributing belt	10
M8 bolts:
step 1	12
step 2	20
Bolts of a maslozaborny branch pipe	8
Bolts of a pulley of the pump of the hydraulic booster of steering:
step 1	20
step 2	Tighten for 30
step 3	Tighten for 15
Bolts of the oil pallet:
pallet bolts:
step 1	8
step 2	Tighten for 30
Bolts of a cast part of the oil pallet:
the bolts fixing a cast part to the block of cylinders and the oil pump	20
the bolts fixing a cast part to the transmission	40
Cap of a drain opening of the oil pallet:
a cap with a six-sided head	55
a cap with a tetrahedral head	10
Bolts of a cover of a gas-distributing belt:
external cover	8
back cover:
M6 bolts	8
M8 bolts	10
Bolt of the lower directing pulley of a gas-distributing belt	40
Pulley of a natyazhitel and the top directing pulley of a gas-distributing belt:
the bolts fixing an arm of pulleys to the block of cylinders	40
nut of a pulley of a natyazhitel	20
a bolt of the directing pulley	40