Engine & identification
Vehicle identification
| No. of cylinders Type | 4/OHC |
|---|---|
| Capacity (Fiscal) cc | 1995 |
| Compression ratio :1 | 8,0 |
| Suitable for unleaded petrol | Yes |
| Minimum octane rating RON | 95 |
| Ignition system Make | Weber-Marelli |
| Ignition system Type | IAW 4W6 |
| Ignition system Description | Map-DIS |
| Trigger location | Crankshaft |
| Fuel system Make | Weber-Marelli |
| Fuel system Type | IAW 4W6 |
| Fuel system Description | MFI-i |
| Air metering Type | MAP |
| Combined ignition and fuel ECM | Yes |
| Diagnostic socket | Yes |
Ignition system
| Ignition coil Make | Bosch |
|---|---|
| Ignition coil supply voltage + with ballast V | 11,0 |
| Primary resistance Ohm | 0,5-0,6 |
| Secondary resistance Ohm | 6660-8140 |
Firing order
The firing order for the Alfa Romeo 155 2.0 Turbo (1992–1998) is 1-3-4-2.
| Firing order | 1-3-4-2 |
|---|
Valve clearances
Valve clearances for the Alfa Romeo 155 2.0 Turbo (1992–1998) are 0,36-0,44 mm inlet and 0,46-0,54 mm exhaust, measured cold.
| Valve clearance - INLET mm | 0,36-0,44 cold |
|---|---|
| Valve clearance - EXHAUST mm | 0,46-0,54 cold |
Engine oil & fluids
Engine oil
The Alfa Romeo 155 2.0 Turbo (1992–1998) takes 4.5 litres of engine oil with the filter.
See the reference table for the complete engine oil entries and their conditions.
Manual gearbox
The manual gearbox has a listed capacity of 4.0 litres. The specified oil is SAE 75W-90 semi-synthetic.
Coolant
The listed total cooling-system capacity is 9.1 litres.
Grades, filling conditions and capacities
| Engine oil options | |
|---|---|
| Ambient temperature range | All temperatures |
| Engine oil grade SAE | 5W-30 Synthetic |
| Engine oil classification API/ACEA | SJ/A1 |
| Ambient temperature range | -20°C➞ |
| Engine oil grade SAE | 10W-40 Synthetic |
| Engine oil classification API/ACEA | SJ/A3 |
| Engine with filter(s) litres | 4.5 |
| Other lubricants and capacities | |
| Manual transmission oil grade SAE | 75W-90 Semi-synthetic |
| Manual transmission litres | 4.0 |
| Differential oil grade - rear SAE | 80W-90 |
| Differential rear litres | 1.4 |
| Cooling system - total capacity litres | 9.1 |
| Brake fluid Type | DOT 4 |
| Brake fluid litres | 0.6 |
| Power steering fluid Type | Dexron II |
| Power steering fluid litres | 1.0 |
Brakes & wear limits
Brake disc thickness
Brake discs on the Alfa Romeo 155 2.0 Turbo (1992–1998) are replaced at a minimum thickness of 18,2 mm (ventilated) front and 9,2 mm rear.
| Minimum disc thickness for replacement - ventilated Front | 18,2 mm |
|---|---|
| Minimum disc thickness | |
| Minimum disc thickness for replacement Rear | 9,2 mm |
Brake disc and drum dimensions
| Minimum disc thickness | |
|---|---|
| Disc runout Front | 0,15 mm |
| Disc runout Rear | 0,15 mm |
| Minimum pad thickness Front | 3 mm |
| Minimum pad thickness Rear | 3 mm |
| Parking brake travel No. of notches | 3-7 |
Service & electrical
Battery
The Alfa Romeo 155 2.0 Turbo (1992–1998) uses a 12 V, 60 Ah battery (reserve capacity 90 minutes).
| Battery V/RC(Ah) | 12/90 (60) |
|---|
Spark plugs
The Alfa Romeo 155 2.0 Turbo (1992–1998) uses Bosch WR6DTC spark plugs with a 0,6 mm electrode gap.
| Spark plugs Original equipment | Bosch |
|---|---|
| Spark plug Type | WR6DTC |
| Electrode gap mm | 0,6 |
| Spark plugs Make | Autolite |
| Spark plug Type | APP62 |
| Electrode gap mm | 0,7 |
| Spark plugs Make | Beru |
| Spark plug Type | 14-6DTU |
| Electrode gap mm | 0,8 |
| Spark plugs Make | Bosch |
| Spark plug Type | WR6DTC |
| Electrode gap mm | 0,6 |
| Spark plugs Make | Champion |
| Spark plug Type | N7BYC |
| Electrode gap mm | 0,7 |
| Spark plugs Make | NGK |
| Spark plug Type | BP6ET |
| Electrode gap mm | 0,8 |
Tuning and emissions
| Tuning conditions | — |
|---|---|
| Idle speed and CO level | |
| Ignition timing - basic BTDC °Engine/rpm | 10±3/850 Not adjustable |
| Ignition advance checks °Engine/rpm | ECM Controlled |
| Idle speed rpm | 850±30 |
| Oil temperature °C | 60 |
| CO level at idle speed - tailpipe Vol. % CO | 0,35 Max |
| CO level at idle speed - sample pipe Vol. % CO | 0,4-0,8 |
| HC level at idle speed ppm | 90 Max |
| CO2 level at idle speed Vol. % CO2 | 14,5-16 |
| O2 level at idle speed Vol. % O2 | 0,1-0,5 |
| Increased idle speed for CO test rpm | 2500-2900 |
| CO content at increased idle speed Vol. % | 0,3 |
| Lambda at increased idle λ | 0,97-1,03 |
Starting and charging
| Starter motor Make | Bosch |
|---|---|
| Starter motor Type | 1,4 kW |
| Maximum cranking amps A | 162-198 |
| Alternator Make | Bosch |
| Alternator Type | 90A |
| Alternator output A/V/rpm | 40/14/1600 |
| Regulated voltage V | 14,0 |
Service checks and adjustments
| Oil pressure bar/rpm | 4/4000 |
|---|
Fuel system
| System pressure bar | 2,8-3,2 |
|---|---|
| Regulated pressure with vacuum bar | 2,3-2,7 |
| Engine coolant temperature (ECT) sensor Ohm/°C | 340-420/80 |
| Crankshaft position (CKP) sensor/engine speed (RPM) sensor Ohm | 570-750 |
| Injector Ohm | 2,0-4,0 |
| Idle air control (IAC) valve/idle speed control (ISC) actuator Ohm | 6,5-8,0 |
| Lambda sensor (Oxygen) heater Ohm | 4,0-12,0 |
Tightening torques
Cylinder head bolt torque
The cylinder head bolts on the Alfa Romeo 155 2.0 Turbo (1992–1998) are tightened in 4 stages: 20 Nm, then 50 Nm, then 90°, then a final 90°.
| Cylinder head | |
|---|---|
| Renew bolts | No |
| Tighten | 20 Nm |
| Tighten | 50 Nm |
| Tighten | 90° |
| Tighten | 90° |
| Cylinder head instructions | — |
|---|---|
| Other engine tightening torques | |
| Main bearings Renew bolts/nuts | No |
| Main bearings Stage 1 | 20 Nm |
| Main bearings Stage 2 | 90° |
| Big end bearings Renew bolts/nuts | No |
| Big end bearings Stage 1 | 25 Nm |
| Big end bearings Stage 2 | 50° |
| Sump drain bolt | 32-52 Nm |
| Flywheel/driveplate | 120-149 Nm |
| Clutch pressure plate | 19-22 Nm |
| Crankshaft pulley/damper centre bolt | 180-199 Nm |
| Camshaft sprocket/gear | 100-123 Nm |
| Camshaft carrier/cap | — |
| Camshaft carrier/cap | |
| Spark plugs | 23-28 Nm |
| Lambda sensor (Oxygen) | 50-60 Nm |
| Chassis tightening torques | |
| Front hub | — |
| View more information | — |
| Front hub | |
| Rear hub | 226-294 Nm |
| Steering track rod end | 29-35 Nm |
| Brake disc to hub Front | 5-13 Nm |
| Brake caliper to carrier Front | 57 Nm |
| Brake caliper/carrier to hub Front | — |
| Carrier to hub | |
| Brake disc to hub Rear | 5,4-12,6 Nm |
| Brake caliper/carrier to hub Rear | — |
| Road wheels | 82±9 Nm Alu=93±10 Nm |
Air conditioning
| No. of AC service connectors | 2 |
|---|---|
| Air conditioning restrictor type | Expansion valve |
| Compressor clutch/magnetic coupling | Yes |
| Compressor variable displacement solenoid | No |
| Air conditioning refrigerant Type | R12 |
| Refrigerant type | |
| Air conditioning refrigerant quantity grams | 950 |
| Refrigerant quantity | |
| Air conditioning oil Type | Suniso 5GS |
| Oil type | |
| Air conditioning oil quantity cm³ | 135 |
Frequently asked questions
What is the firing order of the Alfa Romeo 155 2.0 Turbo?
The firing order for the Alfa Romeo 155 2.0 Turbo (1992–1998) is 1-3-4-2.
What spark plugs does the Alfa Romeo 155 2.0 Turbo use?
The Alfa Romeo 155 2.0 Turbo (1992–1998) uses Bosch WR6DTC spark plugs with a 0,6 mm electrode gap.
How much oil does the Alfa Romeo 155 2.0 Turbo take?
The Alfa Romeo 155 2.0 Turbo (1992–1998) takes 4.5 litres of engine oil with the filter. See the reference table for the complete engine oil entries and their conditions.
What are the valve clearances for the Alfa Romeo 155 2.0 Turbo?
Valve clearances for the Alfa Romeo 155 2.0 Turbo (1992–1998) are 0,36-0,44 mm inlet and 0,46-0,54 mm exhaust, measured cold.
What is the cylinder head torque for the Alfa Romeo 155 2.0 Turbo?
The cylinder head bolts on the Alfa Romeo 155 2.0 Turbo (1992–1998) are tightened in 4 stages: 20 Nm, then 50 Nm, then 90°, then a final 90°.
What is the minimum brake disc thickness for the Alfa Romeo 155 2.0 Turbo?
Brake discs on the Alfa Romeo 155 2.0 Turbo (1992–1998) are replaced at a minimum thickness of 18,2 mm (ventilated) front and 9,2 mm rear.