Opel X16SZR

Opel X16SZR engineThe Opel X16SZR is a 1.6 L (1,598 cc, 97.52 cu·in) straight-4 natural aspirated four-stroke water-cooled internal combustion gasoline engine, manufactured by Opel, a subsidiary of General Motors. The engine used on Opel/Vauxhall models, such as Astra, Vectra, and Zafira.

The Opel X16SZR engine has a cast-iron cylinder block, belt-driven single overhead camshaft (SOHC) and 8 valves (2 per cylinder). This engine used a single-point fuel injection system with GM Multec engine management system and electronic ignition system with the single ignition coil.

This engine produced 75 PS (55 kW; 74 HP) at 5,200 rpm of horsepower and 128 N·m (13.1 kg·m, 94.3 ft·lb) at 2,800 rpm of peak torque.

General information

Engine Specifications
Engine model X16SZR
Production 1996-2004
Engine type 4-stroke, SOHC, inline-4
Displacement 1.6 L, 1,598 cm3, (97.52 cu·in)
Max. horsepower 75 PS (55 kW; 74 HP) at 5,200 rpm
Max. torque 128 N·m (13.1 kg·m, 94.3 ft·lb) at 2,800 rpm
Ignition system Electronic ignition system
Fuel system Single-point fuel injection
Power adder None
Firing order 1-3-4-2
Cooling system Liquid-cooled
Lubricating system Wet sump

Cylinder Block

It has a 79.0 mm (3.11 in) cylinder bore and 81.5 mm (3.21 in) piston stroke. Compression ratio rating is 9.6:1. The engine used a cast-iron cylinder block, each piston is fitted with two compression rings and a single oil ring.

Cylinder block
Compression ratio: 9.6:1
Cylinder bore: 79.0 mm (3.11 in)
Piston stroke: 81.5 mm (3.21 in)
Cylinder internal diameter (standard): 78.975-78.985 mm (3.1092-3.1096 in)
Piston skirt outer diameter (standard): 78.955-78.965 mm (3.1085-3.1089 in)
Number of piston rings (compression / oil): 2/1
Piston pin diameter: 17.997-18.000 mm (0.7085-0.7087 in)
Side clearance (Top): 0.020-0.040 mm (0.0008-0.0016 in)
Side clearance (Second): 0.040-0.060 mm (0.0016-0.0024 in)
Side clearance (Oil): 0.010-0.030 mm (0.0004-0.0012 in)
Ring end gap (Top): 0.30-0.50 mm (0.0118-0.0197 in)
Ring end gap (Second): 0.30-0.50 mm (0.0118-0.0197 in)
Ring end gap (Oil): 0.40-1.4 mm (0.0157-0.0551 in)
Ring width (Top): 1.2 mm (0.0472 in)
Ring width (Second): 1.5 mm (0.0591 in)
Ring width (Oil): 3.0 mm (0.1181 in)
Number of main bearings: 5
Crankshaft main bearing diameter: 54.980-54.997 mm (2.1646-2.1652 in)
Crankpin bearing diameter: 42.971-42.987 mm (1.6918-1.6924 in)
Crankshaft center distance: 40.75 mm (1.605 in)

Cylinder Head

The X16SZR engine has an aluminum head with 2 valves per cylinder (8 in total) and the single camshaft is driven by the crankshaft via a timing belt. Intake valves are 38.0 mm (1.4961 in) in diameter, and the exhaust valves are 31.0 mm (1.2205 in) in diameter. The engine used hydraulic tappets.

Cylinder head
Valve arrangement: SOHC, belt driven
Valves: 2 per cylinder (8 valves in total)
Head height: 95.90-96.10 mm (3.7756-3.7835 in)
Valve head diameter (INTAKE): 38.0 mm (1.4961 in)
Valve head diameter (EXHAUST): 31.0 mm (1.2205 in)
Valve length (INTAKE): 99.35 mm (3.9114 in)
Valve length (EXHAUST): 99.65 mm (3.9232 in)
Valve steam diameter (INTAKE): 6.998-7.012 mm (0.2755-0.2761 in)
Valve steam diameter (EXHAUST): 6.978-6.992 mm (0.2747-0.2753 in)

Tightening torque

Tightening torque settings
Connecting rod bolts Step 1: 25 N·m (2.5 kg·m, 18.4 ft·lb)
Step 2: Turn all bolts: 30°
Crankshaft main 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°
Flywheel bolts Step 1: 35 Nm (3.57 kg·m; 25.83 ft·lb)
Step 2: Turn all bolts: 30°
Step 3: Turn all bolts: 15°
Cylinder head boltss Step 1: 25 N·m (2.5 kg·m, 18.4 ft·lb)
Step 2: Turn all bolts: 85°
Step 3: Turn all bolts another: 85°
Step 4: Turn all bolts another: 20°

Service Data

The ACEA A2-96 / A3-96 oil with a viscosity of 5W-30, 5W-40 or 5W-50 is recommended for the X16SZR, refilling oil capacity is 3.5 L (3.7 US. qt, 3.08 Imp. qt.). The recommended spark plug is BOSCH FLR8LD+U with 1.0 mm (0.0394 in) spark plug gap.

Idle speed: 620-920 rpm
Compression pressure
Standard: 15.0 bar (15.3 kg/cm2; 218 psi)
Minimum: 12.0 bar (12.2 kg/cm2; 174 psi)
Compression differential limit between cylinders: 1.0 bar (1.0 kg/cm2; 15 psi)
Oil type: 5W-30, 5W-40, 5W-50
Recommended oil: ACEA A2-96 / A3-96
Oil capacity: 3.5 L (3.7 US. qt, 3.08 Imp. qt.)
Oil change interval: 5,000 km (7,500 miles)
Fuel system
Type: Single-point fuel injection
Ignition system
Type: Electronic ignition system
Spark plug: BOSCH FLR8LD+U
Spark plug gap: 1.0 mm (0.0394 in)
Spark plug torque: 25 N·m (2.5 kg·m, 18.4 ft·lb)


Model Years Produced
Opel/Vauxhall Astra F 1996-1998
Opel/Vauxhall Astra G 1998-2004
Opel/Vauxhall Zafira A 1998-2004
Opel/Vauxhall Vectra B 1996-2002
ATTENTION! Dear visitors, this is an informational database of technical specifications, we are not a parts supplier or a marketplace.

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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