Twin Overhead Cam Engine Specifications (Opel Astra F)

Engine (General information)

Type - Four-cylinder, in-line, water-cooled. Two overhead camshafts are belt-driven and act on hydraulic valve lifters.

• The engine code assigned by the manufacturer is C 20 XE
• Cylinder diameter/stroke - 86,000/86,000 mm
• Cylinder displacement: 1998 cm³
• The firing order of the cylinders is 1-3-4-2
• Direction of rotation of the crankshaft - Clockwise
• Compression ratio - 10.5
• Max. power - 110 kW at 6000 rpm
• Max. torque - 196 Nm at 4800 rpm
• Max. difference in compression pressure in cylinders 1 bar

Cylinder block

All specifications are the same as for SOHC engines, except for the following:

Cylinder diameter:	Cylinder diameter	Marking
1st nominal	85.975-85.985 mm	8
	85.985-85.995 mm	99
	85.995-86.005 mm	00
	86.005-86.015 mm	01
2nd nominal	86.015-86.025 mm	02
Increased by 0.5 mm	86.465-86.475 mm	7+0.5
	86.475-86.485 mm	8+0.5
	86.485-86.495 mm	9+0.5
	86.495-86-505 mm	0+0.5

Crankshaft and bearings

All specifications are the same as for SOHC engines, except as follows:

Average root neck width:

• Standard - 25.950-26.002 mm
• Size increased by 0.25 mm - 26.150-26.202 mm
• Size increased by 0.5 mm - 26.350 26.402 mm

Pistons

The gap between the piston and the cylinder mirror is 0.020-0.040 mm

Note: Piston diameters - pistons have markings corresponding to those specified above for cylinder bore diameters. The corresponding piston diameter is 0.030 mm smaller than the corresponding cylinder diameter.

Piston rings

All technical characteristics are the same as for engines with single camshaft.

Cylinder head

All specifications are the same as for SOHC engines, except for the following:

Overall height of cylinder head (from one mating surface to another) — 135,630 mm

Valve seat chamfer width:

• Inlet - 1.000-1.4000 mm
• Release - 1.400-1.8000 mm

Camshafts

• Camshaft journal diameter - 27.939-27.960 mm
• The diameter of the camshaft bearing in the cylinder head and bearing cap is 28.000-28.021 mm
• Max. allowable radial runout - 0.040 mm
• Shaft offset along the axis - 0.040-0.144 mm

(Text copied from an internet website: opelbook.ru)

Valves and guides

Rod diameter:	Inlet	Release
Standard	6.955-6.970 mm	6.945-6.960 mm
Increased size by 0.075 mm	7.030-7.045 mm	7.020-7.035 mm
Increased size by 0.150 mm	7.105-7.120 mm	7.095-7.110 mm
Valve Guide Bore Diameter:
Standard	7.000-7.015 mm
Increased size by 0.075 mm	7.075-7.090 mm
Increased size by 0.150 mm	7.150-7.165 mm

Maximum allowable valve stem clearance in the guide:

• Inlet - 0.030-0.060 mm
• Issue - 0.040-0.070 mm

Valve seat chamfer angle - 44° 44'

Valve clearances - Automatic adjustment with hydraulic tappets

Flywheel

All technical characteristics are the same as for 1.8 and 2.0 l engines single camshaft.

Lubrication system

All technical characteristics are the same as for 1.8 and 2.0 l engines single camshaft.

Torque wrench tightening torque, Nm

All torque values are the same as for the 2L engine single camshaft, except for the following:

Timing Belt Cover Fastening Bolts — 8

Camshaft sprocket bolt - 50, then turn it to an angle of 40-50°



Crankshaft sprocket bolt - 250, then tighten by 40-50°

Belt tensioner bolts - 25, then tighten to an angle of 45-60°

Cylinder head bolts - 25, then in 4 stages sequentially tighten by 65°, 65°, 65° and 30-45° (the engine is warmed up)

Camshaft Bearing Cap Nuts:

• Indigenous (M8) - 20
• Rear (M6) - 10

Pan bolts - 15

Flywheel bolts - 65, then turn to an angle of 40-50°

Engine bracket mounting bolts - 75

Power steering pump bracket to engine mounting bolts - 40

Engine breather tube mounting bolts - 25