Opel A18XER

Opel A18XER engineThe Opel A18XER is a 1.8 L (1,796 cc, 109.6 cu·in) straight-4 natural aspirated four-stroke liquid-cooled internal combustion vertical gasoline engine from the 3-rd generation of GM Family 1. This engine was developed by Opel (a subsidiary of General Motors) and manufactured since 2008.

The A18XER engine used a cast-iron cylinder block with five-bearings crankshaft and aluminum head with dual overhead camshafts (DOHC) and four valves per cylinder (16 valves in total). The engine is equipped with a sequential fuel injection system, double continuous variable cam phasing (DCVCP), and Coil-on-Plug high energy ignition system (individual ignition coil for each spark plug). Redline is 6,500 rpm.

The Opel A18XER engine is a Euro 5 version of the Z18XER. This engine is also produced under the name F18DA/F18D4 for the Korean market and 2H0.

This engine produced 140 PS (103 kW; 138 HP) at 6,300 rpm of horsepower and 175 N·m (17.8 kg·m, 129 ft·lb) at 3,800 rpm of torque.

The breakdown of the engine code is as follows:

  • A – Euro 5 engine
  • 18 – 1.8 Liter displacement
  • X – Comression ratio from 10 to 11.5:1
  • E – Multi Point Fuel Injection system
  • R – Power is increased compared to A18XE

General information

Engine Specifications
Engine modelOpel A18XER
Engine type4-stroke, DOHC, straight-4
Displacement1,796 cm3, (109.6 cu·in)
Max. horsepower140 PS (103 kW; 138 HP) at 6,300 rpm
Max. torque175 N·m (17.8 kg·m, 129 ft·lb) at 3,800 rpm
Cooling systemLiquid-cooled
Lubricating systemPressure feed
Ignition systemCoil-on-Plug Ignition System
Fuel systemSequential fuel injection
Charging systemAlternator 12V 100 Amp
Firing order:1-3-4-2
Dimensions (L X H)513 x 420 mm (20.2 x 16.5 in)
Dry weight119 kg (262.3 lbs)

Cylinder Block

The Opel A18XER has a cars-iron cylinder block with cast nodular iron crankshaft. The cylinder block is based on the proven hollow-frame concept. It has an 80.5 mm (3.17 in) cylinder bore and 88.2 mm (3.47 in) piston stroke. Compression ratio rating is 10.5:1.

Pistons apply a floating-pin design. The Opel A18XER motor has an aluminum alloy piston for high strength with two compression and single oil control rings. Connecting rods are made of forged steel.

Cylinder block
Cylinder block alloy:Cast-iron
Compression ratio:10.5:1
Cylinder bore:80.5 mm (3.17 in)
Piston stroke:88.2 mm (3.47 in)
Cylinder internal diameter (standard):80.492-80.508 mm (3.169-3.1696 in)
Piston skirt outer diameter (standard):80.455-80.465 mm (3.1675-3.1679 in)
Number of piston rings (compression / oil):2/1
Piston pin diameter:19.000 mm (0.748 in)
Side clearance (Top):0.040-0.080 mm (0.0016-0.0031 in)
Side clearance (Second):0.030-0.070 mm (0.0012-0.0028 in)
Side clearance (Oil):0.030-0.130 mm (0.0012-0.0051 in)
Ring end gap (Top):0.20-0.40 mm (0.0079-0.0157 in)
Ring end gap (Second):0.40-0.60 mm (0.0157-0.0236 in)
Ring end gap (Oil):0.25-0.75 mm (0.0098-0.0295 in)
Number of main bearings:5
Crankshaft main journal diameter:54.980-54.997 mm (2.1646-2.1652 in)
Crankpin journal diameter:42.971-42.987 mm (1.6918-1.6924 in)
Crankshaft center distance:44.1 mm (1.735 in)

Cylinder head

The cylinder head is made of strong, light aluminium alloy which gives it good cooling efficiency. The Opel A18XER has double continuous variable cam phasing (DCVCP) system. The camshaft is driven by the timing belt.

This engine has dual overhead camshafts and 16 valves, 4 per cylinder. Camshafts are made of the cast chilled iron. The intake valve diameter is 31.0 mm (1.22 in), valve lift is 9.3 mm (0.37 in); the exhaust valve diameter is 27.5 mm (1.08 in), valve lift is 8.3 mm (0.33 in).

Cylinder head
Cylinder head alloy:Aluminium
Valve arrangement:DOHC, belt driven
Valves::4 per cylinder, (16 valves in total)
Valve head diameter (INTAKE):31.1-31.3 mm (1.2244-1.2323 in)
Valve head diameter (EXHAUST):27.4-27.6 mm (1.0787-1.0866 in)
Valve steam diameter (INTAKE):4.965-4.980 mm (0.1955-0.1961 in)
Valve steam diameter (EXHAUST):4.950-4.965 mm (0.1949-0.1955 in)
Valve spring free length (INTAKE):41.6 mm (1.6378 in)
Valve spring free length (EXHAUST):41.6 mm (1.6378 in)
Camshaft lobe height (INTAKE):9.3 mm (0.3661 in)
Camshaft lobe height (EXHAUST):8.3 mm (0.3268 in)

Tightening torque

Tightening procedure and torque specs
Connecting rod bearing cap bolts Step 1: 35 Nm (3.6 kg·m; 25.8 ft·lb)
Step 2: Turn all bolts 45°
Step 3: Turn all bolts 15°
Crankshaft bearing cap bolts Step 1: 50 Nm (5.1 kg·m; 36.9 ft·lb)
Step 2: Turn all bolts 45°
Step 3: Turn all bolts 15°
Cylinder head Step 1: 25 Nm; 2.5 kg·m; 18.5 ft·lb)
Step 2: Turn all bolts 90°
Step 3: Turn all bolts 90°
Step 4: Turn all bolts 90°
Step 5: Turn all bolts 45°

Service Data

The GM-LL-A-025 engine oil with a viscosity of SAE 0-W30, 0-W40, 5-W30 and 5-W40 is recommended for the A18XER, refilling oil capacity is 4.5 L (4.76 US. qt, 3.96 Imp. qt.). Recommended spark plug is FQR8LEU2 with 0.85-0.95 mm (0.0335-0.0374 in) spark plug gap.

The valve clearance is 0.20-0.30 mm (0.0079-0.0118 in) for intake valves and 0.25-0.35 mm (0.0098-0.0138 in) for exhaust valves. Standard cylinder compression is 16.0 bar (16.3 kg/cm2; 232 psi).

Maximum speed:6,500 rpm
Idle speed:780-1,000 rpm
Compression pressure
Standard:16.0 bar (16.3 kg/cm2; 232 psi)
Minimum:14.0 bar (14.3 kg/cm2; 203 psi)
Compression differential limit between cylinders:1.0 bar (1.0 kg/cm2; 15 psi)
Valve clearance
Intake valve clearance:0.20-0.30 mm (0.0079-0.0118 in)
Exhaust valve clearance :0.25-0.35 mm (0.0098-0.0138 in)
Oil system
Lubrication system:Pressure feed
Oil consupumtion:0.6 m per 1,000 km
Oil type:GM-LL-A-025
Recommended oil:0-W30, 0-W40, 5-W30 and 5-W40
Oil capacity:4.5 L (4.76 US. qt, 3.96 Imp. qt.)
Fuel system
Type:Sequential fuel injection
Ignition system
Type:Electronic Ignition System
Spark plug:FQR8LEU2
Spark plug gap:0.85-0.95 mm (0.0335-0.0374 in)
Spark plug torque:25 N·m (2.5 kg·m, 18.4 ft·lb)


ModelYears Produced
Opel Insignia2008-2013
Opel Zafira2010-2014
Opel Mokka2013-
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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We try to use official documentation and verify the published data, but errors may occur. In addition, specifications of machinery and equipment may vary depending on markets and modifications. We do not recommend the use of this data for spare parts or repairs. Use official service manuals or parts catalogs for your product.

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