Technical specifications (Opel Omega B)

2.0 liter engine
Maximum deformation of the gasket surface	0.05 mm
Cylinder head height:
– SOHC	95.75 – 96.25 mm
– DOHC	134 mm
Valve seat width:
– SOHC:
• intake	1.0 – 1.5 mm
• graduation	1.7 – 2.2 mm
– DOHC:
• intake	1.0 – 1.4 mm
• graduation	1.4 – 1.8 mm
Height of valve guide bushing in cylinder head:
– SOHC	83.25 – 84.05 mm
– DOHC	13.70 – 14.00 mm
2.5 and 3.0 liter engines
Maximum deformation of the gasket surface	0.05 mm
Cylinder head height	134 mm
Valve seat width:
- intake	1.0 – 1.4 mm
- graduation	1.4 – 1.8 mm
Height of valve guide bushing in cylinder head	13.7 – 14.0 mm

Valves and guide bushings

2.0 liter engine
Valve stem diameter (SOHC)*:
- inlet:
• nominal (GM)	6.998 – 7.012 mm
• after the first boring bushings (0.075 mm – GM K1)	7.073 – 7.087 mm
• after the second boring bushings (0.150 mm – GM K2)	7.148 – 7.162 mm
• after the third boring bushings (0.250 mm – A)	7.248 – 7.262 mm
- graduation:
• nominal (GM)	6.978 – 7.992 mm
• after the first boring bushings (0.075 mm – GM K1)	7.053 – 7.067 mm
• after the second boring bushings (0.150 mm – GM K2)	7.128 – 7.142 mm
• after the third boring bushings (0.250 mm – A)	7.228 – 7.262 mm
Valve stem diameter (DOHC)*:
- inlet:
• nominal (GM)	5.955 – 5.970 mm
• after the first boring bushings (0.075 mm – GM K1)	6.030 – 6.045 mm
• after the second boring bushings (0.150 mm – GM K2)	6.105 – 7.120 mm
- graduation:
• nominal (GM)	5.945 – 5.960 mm
• after the first boring bushings (0.075 mm – GM K1)	6.020 – 6.035 mm
• after the second boring bushings (0.150 mm – GM K2)	6.095 – 6.110 mm
Valve stem runout	less than 0.03 mm
Valve stem guide bushing bore diameter:
– SOHC:
• nominal	7,030 – 7,050 mm
• after the first boring bushings (0.075 mm)	7.105 – 7.125 mm
• after the second boring bushings (0.150 mm)	7,180 – 7,200 mm
• after the third boring bushings (0.250 mm)	7,280 – 7,300 mm
– DOHC:
• nominal	6,000 – 6,012 mm
• after the first boring bushings (0.065 mm)	6.075 – 6.090 mm
• after the second boring bushings (0.150 mm)	6.150 – 6.165 mm
Clearance between valve stem and guide bushing:
– SOHC:
• inlet	0.018 – 0.052 mm
• outlet	0.038 – 0.072 mm
– DOHC:
• inlet	0.030 – 0.057 mm
• outlet	0.040 – 0.067 mm
Valve Length (SOHC):
- inlet:
• standard valve	104.0 – 104.4 mm
• worn valve	103.6 – 104.0 mm
- graduation:
• standard valve	103.75 – 104.25 mm
• worn valve	103.35 – 103.85 mm
Valve Length (DOHC):
- inlet:
• standard valve	101.9 – 102.3 mm
• worn valve	101.5 – 101.9 mm
- graduation:
• standard valve	92.05 – 92.45 mm
• worn valve	91.65 – 92.05 mm
Height of the installed valve stem:
– SOHC	17.85 – 18.25 mm
– DOHC:
• standard valve	39.6 – 40.2 mm
• worn valve	39,239,8 mm
Valve head diameter:
– SOHC:
• intake	41.8 mm
• graduation	36.5 mm
DOHC:
• intake	31.9 – 32.1 mm
• graduation	28.9 – 29.1 mm
2.5 and 3.0 liter engines
Valve stem diameter*:
- inlet:
• nominal (GM)	5.955 – 5.970 mm
• after the first boring bushings (0.075 mm – GM K1)	6.030 – 6.045 mm
• after the second boring bushings (0.150 mm – GM K2)	6.105 – 6.120 mm
- graduation:
• nominal (GM)	5.945 – 5.960 mm
• after the first boring bushings (0.075 mm – GM K1)	6.020 – 6.035 mm
• after the second boring bushings (0.150 mm – GM K2)	6.095 – 6.110 mm
Valve stem runout	less than 0.03 mm
Valve stem guide bushing bore diameter:
- nominal	6,000 – 6,012 mm
– after the first boring of the bushing (0.075 mm)	6.075 – 6.090 mm
– after the second boring of the bushing (0.150 mm)	6.150 – 6.165 mm
Clearance between valve stem and guide bushing:
- inlet	0.030 – 0.057 mm
- graduation	0.040 – 0.067 mm
Valve length:
- inlet:
• standard valve	101.9 – 102.3 mm
• worn valve	101.5 – 101.9 mm
- graduation:
• standard valve	92.05 – 92.45 mm
• worn valve	91.65 – 92.05 mm
Valve head diameter:
- intake	31.9 – 32.1 mm
- graduation	28.9 – 29.1 mm

* The identification number is given in brackets.

Cylinder block

2.0 liter engines
Maximum deformation of the gasket surface	0.05 mm
Cylinder diameter:
– nominal:
• class 8	85.975 – 85.985 mm
• class 99	85.985 – 85.995 mm
• class 00	85.995 – 86.005 mm
• class 01	86.005 – 86.015 mm
• class 02	86.015 – 86.025 mm
– after boring (0.5 mm)	86.465 – 86.475 mm
Maximum cylinder ovality	0.013 mm
Maximum cylinder taper	0.013 mm
2.5 and 3.0 liter engines
Maximum deformation of the gasket surface	0.05 mm
Cylinder diameter (2.5 liter engine):
– nominal:
• class 8	81.575 – 81.585 mm
• class 99	81.585 – 81.595 mm
• class 00	81.595 – 81.605 mm
• class 01	81.605 – 81.615 mm
• class 02	81.615 – 81.625 mm
– after boring (0.5 mm)	82.065 – 82.075 mm
Cylinder diameter (3.0 liter engine):
– nominal:
• class 8	85.975 – 85.985 mm
• class 99	85.985 – 85.995 mm
• class 00	85.995 – 86.005 mm
• class 01	86.005 – 86.015 mm
• class 02	86.015 – 86.025 mm
– after boring (0.5 mm)	86.465 – 86.475 mm
Maximum cylinder ovality	0.013 mm
Maximum cylinder taper	0.013 mm

Pistons and piston rings

2.0 liter engines
Piston diameter:
– nominal:
• class 8	85.945 – 85.955 mm
• class 99	85.955 – 85.965 mm
• class 00	85.965 – 85.975 mm
• class 01	85.975 – 85.985 mm
• class 02	86.985 – 86.995 mm
– after boring (0.5 mm)	86.435 – 86.445 mm
Clearance between piston and cylinder	0.02 – 0.04 mm
End clearances of piston rings installed in cylinders:
- compression rings	0.3 – 0.5 mm
- oil scraper ring	0.4 – 1.4 mm
Piston ring thickness:
- compression rings	1.5 mm
- oil scraper ring	3.0 mm
Clearance between piston ring and ring groove:
- compression rings	0.02 – 0.04 mm
- oil scraper ring	0.01 – 0.03 mm
2.5 and 3.0 liter engines
Piston diameter (2.5 liter engine):
– nominal:
• class 8	81,540 – 81,550 mm
• class 99	81,550 – 81,560 mm
• class 00	81,560 – 81,570 mm
• class 01	81,570 – 81,580 mm
• class 02	81.580 – 81.040 mm
– after boring (0.1 mm)	82.030 – 82.040 mm
Piston diameter (3.0 liter engine):
– nominal:
• class 8	85.940 – 85.950 mm
• class 99	85.950 – 85.960 mm
• class 00	85.960 – 85.970 mm
• class 01	85.970 – 85.980 mm
• class 02	86,980 – 86,990 mm
– after boring (0.5 mm)	86.430 – 86.440 mm
Clearance between piston and cylinder	0.025 – 0.045 mm
End clearances of piston rings installed in cylinders:
- compression rings	0.3 – 0.5 mm
- oil scraper ring	0.4 – 1.4 mm
Piston ring thickness:
- compression rings	1.5 mm
- oil scraper ring	3.0 mm
Clearance between piston ring and ring groove:
- compression rings	0.02 – 0.04 mm
- oil scraper ring	0.01 – 0.03 mm

Piston pins

2.0 liter engine
Diameter	20,990 – 21,000 mm
Length	61.2 – 61.8 mm
Clearance between piston and piston pin	0.011 – 0.014 mm
2.5 and 3.0 liter engines
Diameter	20,990 – 21,000 mm
Length:
– 2.5 liters	55.7 – 56.0 mm
– 3.0 liters	57.7 – 58.0 mm
Clearance between piston and piston pin:
– 2.5 liters	0.011 – 0.014 mm
– 3.0 liters	0.001 – 0.015 mm
Clearance between piston pin and connecting rod:
– 2.5 liters	Fixed landing
– 3.0 liters	0.014 – 0.030 mm

Crankshaft

2.0 liter engines
Free play	0.05 – 0.15 mm
Main bearing journal diameter:
– nominal:
• 1st group	57.974 – 57.981 mm
• 2nd group	57.981 – 57.988 mm
• 3rd group	57.988 – 57.995 mm
– after the first turning (0.25 mm)	57.732 – 57.745 mm
– after the second turning (0.50 mm)	57.482 – 57.495 mm
Connecting rod bearing journal diameter:
- nominal	48.970 – 48.988 mm
– after the first turning (0.25 mm)	48.720 – 48.738 mm
– after the second turning (0.50 mm)	48.470 – 48.488 mm
Crankshaft journal ovality	0.04 mm
Taper of necks	0.04 mm
Permissible shaft runout	less than 0.03 mm
Main bearing working clearance	0.015 – 0.043 mm
Connecting rod bearing working clearance	0.006 – 0.031 mm
2.5 and 3.0 liter engines
Free play	0.01 – 0.76 mm
Main bearing journal diameter:
- nominal	67.980 – 67.996 mm
– after the first turning (0.25 mm)	67,730 – 67,746mm
– after the second turning (0.50 mm)	67.480 – 67.496 mm
Connecting rod bearing journal diameter:
– 2.5 liters:
• nominal	48.971 – 48.990 mm
• after the first turning (0.25 mm)	48.721 – 48.740 mm
• after the second turning (0.50 mm)	48.721 – 48.740 mm
– 3.0 liters:
• nominal	53.971 – 53.990 mm
• after the first turning (0.25 mm)	53.721 – 53.740 mm
• after the second turning (0.50 mm)	53.471 – 53.490 mm
Crankshaft journal ovality	0.04 mm
Taper of necks	0.04 mm
Permissible shaft runout	less than 0.03 mm
Main bearing working clearance	0.014 – 0.043 mm
Connecting rod bearing working clearance	0.010 – 0.061 mm

Tightening torques, Nm

2.0 liter SOHC engine
Camshaft Cover Bolts	8
Camshaft Sprocket Bolt	45
Camshaft Thrust Plate Bolts	8
Camshaft Housing Rear Cover Bolts	8
Connecting rod cap bolt:
- step 1	35
- step 2	Tighten another 45°
- step 3	Tighten another 15°
Coolant pump bolts	25
Engine Crankcase Ventilation Tube Bolts	25
Crankshaft Pulley Bolts	20
Crankshaft Sensor Rotor Bolts	13
Crankshaft Sprocket Bolt:
- step 1	130
- step 2	Tighten another 40 – 50°
Cylinder head bolts:
- step 1	25
- step 2	Tighten another 90°
- step 3	Tighten another 90°
- step 4	Tighten another 90°
Drive Disc Bolts:
- step 1	55
- step 2	Tighten another 30°
- step 3	Tighten another 15°
Engine and gearbox mounts:
– left and right supports:
• support fastening nut to the body	55
• support fastening nut to its bracket	40
• bolts securing the bracket cylinder block supports	60
– rear support:
• bolts securing the support to the gearbox	40
• nuts securing the support to the crossbar	20
• bolts securing the crossbar to the body	45
Engine and gearbox support bracket bolts:
- bolt securing the bracket to the engine	40
- bolts securing the bracket to the gearbox	22
- bolts securing the gearbox to the engine	60
Flywheel bolts:
- step 1	65
- step 2	Tighten another 30°
- step 3	Tighten another 15°
Main bearing cap bolts:
- step 1	50
- step 2	Tighten another 45°
- step 3	Tighten another 15°
Oil filter	15
Oil pump:
- mounting bolts	8
– pump cover screws	6
- pressure reducing valve bolt	50
- oil intake pipe bolts	8
- heat-insulating shields for spark plugs	25
Oil pan bolts:
- mounting bolts	8
- oil pan drain plug	55
Timing Belt Cover Bolts:
- outer cover	4
- back cover	6
Timing Belt Tensioner Bolt	20
2.0 liter DOHC engine
Camshaft Bearing Cap Bolts	8
Camshaft Cover Bolts	8
Camshaft Sprocket Bolt:
- step 1	50
- step 2	Tighten another 60°
- step 3	Tighten another 15°
Coolant pump bolts	25
Connecting rod cap bolt:
- step 1	35
- step 2	Tighten another 45°
- step 3	Tighten another 15°
Engine Crankcase Ventilation Tube Bolts	25
Crankshaft Balancer Bolts - Engines released since 1998:
- step 1	20
- step 2	Tighten another 45°
Crankshaft Pulley Bolts	20
Crankshaft Sensor Rotor Bolts	13
Crankshaft Sprocket Bolt:
- step 1	130
- step 2	Tighten another 40 – 50°
Cylinder head bolts:
- step 1	25
- step 2	Tighten another 90°
- step 3	Tighten another 90°
- step 4	Tighten another 90°
- step 5	Tighten another 15°
Drive Disc Bolts:
- step 1	55
- step 2	Tighten another 30°
- step 3	Tighten another 15°
Engine and gearbox mounts:
Left and right supports:
- a nut that secures the support to the body	55
- a nut that secures the support to its bracket	40
– bolts securing the support bracket to the cylinder block	60
Rear support:
- bolts securing the support to the gearbox	40
- nuts securing the support to the crossbar	20
- bolts securing the cross member to the body	45
– bolts securing the gearbox to the engine:
- bolts securing the gearbox to the cylinder block	60
– bolts securing the gearbox to the oil flange pallet (engines with a composite oil pan)	40
Engine and gearbox support bracket bolts (engines with a solid oil pan):
- bolt securing the bracket to the engine	40
- bolts securing the bracket to the gearbox	22
Flywheel bolts:
- step 1	65
- step 2	Tighten another 30°
- step 3	Tighten another 15°
Main bearing cap bolts:
- step 1	50
- step 2	Tighten another 45°
- step 3	Tighten another 15°
Oil pan casting bolts (engines with composite oil pan):
- step 1	20
- step 2	Tighten another 45°
Oil filter	15
Oil pump:
- mounting bolts	8
– pump cover screws	6
- pressure reducing valve bolt	50
Oil pickup pipe bolts:
– engines with a solid oil pan	8
– engines with a composite oil pan:
• bolts securing the oil pickup branch pipe to oil pump housing	8
• m6 bolts securing the oil intake pipe to the cast part of the oil pan	10
• m8 bolts securing the oil intake pipe to the cast part of the oil pan	20
Oil pan bolts (the oil pan consists of two parts):
– pallet bolts:
• step 1	8
• step 2	Tighten another 30°
– bolts of the cast part of the oil pan:
• bolts securing the block to the cylinder block and oil pump	20
• bolts securing the block gearbox	40
Oil pan drain plug:
- Hexagon head plug	45
- plug with square head	10
Timing Belt Cover Bolts:
- outer cover	6
- back cover	8
Timing Belt Idle Pulley:
- pulley bolt	25
- bracket bolts	25
– timing belt tensioner bolt	20
2.5 and 3.0 liter engines
Additional Belt Tensioner Bolts	35
Partition wall bolts	8
Camshaft Bearing Cap Bolts	8
Camshaft Cover Bolts	8
Camshaft Sensor Bolt	8
Camshaft Sprocket Bolt:
- step 1	50
- step 2	Tighten another 60°
- step 3	Tighten another 15°
Connecting rod cap bolt:
- step 1	35
- step 2	Tighten another 45°
- step 3	Tighten another 15°
Right cylinder block ventilation pipe bolts	25
Engine bracket bolt intended for mounting lift	25
Coolant pump bolts	25
Coolant Pump Pulley Bolts:
- step 1	8
- step 2	Tighten another 30°
- step 3	Tighten another 30°
Engine Crankcase Ventilation Tube Bolts	8
Crankshaft Pulley Bolts	20
Crankshaft Sensor Rotor Bolts	15
Crankshaft Sprocket Bolt:
- step 1	250
- step 2	Tighten another 45°
- step 3	Tighten another 15°
Cylinder head bolts:
- step 1	25
- step 2	Tighten another 90°
- step 3	Tighten another 90°
- step 4	Tighten another 90°
- step 5	Tighten another 15°
Cylinder Head Coolant Hose Bolts	30
Drive Disc Bolts:
- step 1	65
- step 2	Tighten another 30°
- step 3	Tighten another 15°
Engine and gearbox mounts:
Left and right supports:
- a nut that secures the support to the body	55
- a nut that secures the support to its bracket	40
– bolts securing the support bracket to the cylinder block	60
- shock absorber bolts	40
Rear support:
- bolts securing the support to the gearbox	40
- nuts securing the support to the crossbar	20
- bolts securing the cross member to the body	45
Bolts securing the gearbox to the engine:
- bolts securing the gearbox to the cylinder block	60
– bolts securing the gearbox to the oil flange pallet	40
Flywheel bolts:
- step 1	65
- step 2	Tighten another 30°
- step 3	Tighten another 15°
Main bearing cap block bolts:
– cover bolts:
• step 1	50
• step 2	Tighten another 60°
• step 3	Tighten another 15°
- fittings of the block of covers	8
– bolts (M8) securing the block of covers to the cylinder block	20
Oil radiator:
- cover bolts	20
- cover nuts	30
- bolts and nuts for connecting oil radiator tubes	30
Oil filter	15
Oil pump cover screws	8
Oil pump mounting bolts:
- M6 bolts with original rear timing cover belt:
• initial tightening torque	8
• final tightening torque	10
– M6 bolts with modified rear timing cover belt	10
– M8 bolts:
• step 1	12
• step 2	20
Oil pickup pipe bolts	8
Power Steering Pump Pulley Bolts:
- step 1	20
- step 2	Tighten another 30°
- step 3	Tighten another 15°
Oil pan bolts:
– pallet bolts:
• step 1	8
• step 2	Tighten another 30°
Oil pan casting bolts:
Bolts securing the casting to the cylinder block and oil pump	20
Bolts securing the casting to the gearbox	40
Oil pan drain plug:
- Hexagon head plug	55
- plug with square head	10
Timing Belt Cover Bolts:
- outer cover	8
– back cover:
• m6 bolts	8
• m8 bolts	10
Lower timing belt guide pulley bolt	40
Tensioner pulley and upper timing pulley belt:
– bolts securing the pulley bracket to the cylinder block	40
- tensioner pulley nut	20
- guide pulley bolt	40

[Article posted on Internet portal: www.OPELBOOK.ru]