Engine & identification
Vehicle identification
| No. of cylinders Type | 6/OHC |
|---|---|
| Capacity (Fiscal) cc | 2492 (2464) |
| Compression ratio :1 | 9,0 |
| Suitable for unleaded petrol | Yes |
| Minimum octane rating RON | 98/95 |
| Ignition system Make | Bosch |
| Ignition system Type | TSZ-i |
| Ignition system Description | Trans-i |
| Fuel system Make | Dellorto |
| Fuel system Type | FBPA 40 |
| Fuel system Description | Carb-2V |
Ignition system
| Ignition coil Make | Bosch |
|---|---|
| Ignition coil Type | 0 221 122 015 |
| Ignition coil supply voltage + with ballast V | 11,0 |
| Primary resistance Ohm | 1,0-1,4 |
| Distributor (ECM) Make | Bosch |
| Distributor (ECM) No. | 0 237 303 001 |
Firing order
The firing order for the Alfa Romeo 6 2.5 (1979–1983) is 1-4-2-5-3-6.
| Firing order | 1-4-2-5-3-6 |
|---|
Valve clearances
Valve clearances for the Alfa Romeo 6 2.5 (1979–1983) are 0,50 mm inlet and 0,25 mm exhaust, measured cold.
| Valve clearance - INLET mm | 0,50 cold |
|---|---|
| Valve clearance - EXHAUST mm | 0,25 cold |
Engine oil & fluids
Engine oil
The Alfa Romeo 6 2.5 (1979–1983) takes 6.0 litres of engine oil with the filter.
A listed engine oil option is SAE 10W-50 for moderate climates, with API/ACEA classification SE.
A listed engine oil option is SAE 15W-50 as an alternative for moderate climates.
Manual gearbox
The manual gearbox has a listed capacity of 1.6 litres. The specified oil is SAE 85W-90.
Coolant
The listed total cooling-system capacity is 13.0 litres.
Grades, filling conditions and capacities
| Engine oil options | |
|---|---|
| Ambient temperature range | Moderate climate |
| Engine oil grade SAE | 10W-50 |
| Engine oil classification API/ACEA | SE |
| Ambient temperature range | Moderate climate alternative |
| Engine oil grade SAE | 15W-50 |
| Engine with filter(s) litres | 6.0 |
| Other lubricants and capacities | |
| Manual transmission oil grade SAE | 85W-90 |
| Manual transmission litres | 1.6 |
| Automatic transmission fluid Type | Dexron |
| Automatic transmission (drain & refill) litres | 6.5 |
| Differential oil grade - rear SAE | 90W |
| Differential rear litres | 1.3 |
| Cooling system - total capacity litres | 13.0 |
Service & electrical
Battery
The Alfa Romeo 6 2.5 (1979–1983) uses a 12 V, 66 Ah battery (reserve capacity 110 minutes).
| Battery V/RC(Ah) | 12/110 (66) |
|---|
Spark plugs
The Alfa Romeo 6 2.5 (1979–1983) uses Lodge 2HL-E spark plugs with a 0,7 mm electrode gap.
| Spark plugs Original equipment | Lodge |
|---|---|
| Spark plug Type | 2HL-E |
| Electrode gap mm | 0,7 |
| Spark plugs Make | Autolite |
| Spark plug Type | 62 |
| Electrode gap mm | 0,7 |
| Spark plugs Make | Bosch |
| Spark plug Type | W7DC |
| Electrode gap mm | 0,7 |
| Spark plugs Make | Champion |
| Spark plug Type | RN11YCC |
| Electrode gap mm | 0,8 |
| Spark plugs Make | NGK |
| Spark plug Type | B7ES |
| Electrode gap mm | 0,6 |
Tuning and emissions
| Ignition timing | Without vacuum |
|---|---|
| Ignition timing - basic BTDC °Engine/rpm | 7-10/925 |
| Ignition timing - alternative °Engine/rpm | 95=4-7/925 |
| Ignition advance | Without vacuum and basic timing |
| Ignition advance checks °Engine/rpm | 31-34/5000 |
| Ignition advance checks °Engine/rpm | 18-24/2700 |
| Ignition advance checks °Engine/rpm | 24-30/4000 |
| Idle speed rpm | 850-1000 |
| Fast idle speed - MT/AT rpm | 1400-1600 |
| Oil temperature °C | 70 |
| CO level at idle speed - tailpipe Vol. % CO | 3,5 Max |
| HC level at idle speed ppm | 350 |
| CO2 level at idle speed Vol. % CO2 | 13-16 |
| O2 level at idle speed Vol. % O2 | 0,5-2,0 |
Starting and charging
| Starter motor Make | Bosch |
|---|---|
| Starter motor Type | 0 001 311 126 |
| Minimum starting voltage V | 10,0 |
| Maximum cranking amps A | 172-218 |
| Alternator Make | Bosch |
| Alternator Type | 0 120 489 906 |
| Alternator output A/V/rpm | 65/14/2000 |
| Voltage regulator Type | 0 192 052 013 |
| Regulated voltage V | 13,7-14,5 |
Service checks and adjustments
| Oil pressure bar/rpm | 4-6/5500 |
|---|---|
| Thermostat opens °C | 81-85 |
| Drive belt size - alternator mm | 9,5x925 |
| Drive belt size - PAS/AC mm | 9,5x875 |
Fuel system
| Fuel pump delivery pressure bar | 0,4 |
|---|
Tightening torques
Cylinder head bolt torque
The cylinder head bolts on the Alfa Romeo 6 2.5 (1979–1983) are tightened in 2 stages: 78 Nm, then a final 88 Nm.
| Cylinder head | |
|---|---|
| Tighten | 78 Nm |
| Tighten | Run engine 1000 km |
| Tighten | 88 Nm |
| Cylinder head instructions | — |
|---|---|
| Other engine tightening torques | |
| Main bearings Stage 1 | 38-39 Nm |
| Main bearings Stage 2 | 76-78 Nm |
| Big end bearings Stage 1 | 23-25 Nm |
| Big end bearings Stage 2 | 46-51 Nm |
| Flywheel/driveplate | 113 Nm |
| Spark plugs | 25-34 Nm |
| Chassis tightening torques | |
| Road wheels | 90-110 Nm |
Frequently asked questions
What is the firing order of the Alfa Romeo 6 2.5?
The firing order for the Alfa Romeo 6 2.5 (1979–1983) is 1-4-2-5-3-6.
What spark plugs does the Alfa Romeo 6 2.5 use?
The Alfa Romeo 6 2.5 (1979–1983) uses Lodge 2HL-E spark plugs with a 0,7 mm electrode gap.
How much oil does the Alfa Romeo 6 2.5 take?
The Alfa Romeo 6 2.5 (1979–1983) takes 6.0 litres of engine oil with the filter. A listed engine oil option is SAE 10W-50 for moderate climates, with API/ACEA classification SE. A listed engine oil option is SAE 15W-50 as an alternative for moderate climates.
What are the valve clearances for the Alfa Romeo 6 2.5?
Valve clearances for the Alfa Romeo 6 2.5 (1979–1983) are 0,50 mm inlet and 0,25 mm exhaust, measured cold.
What is the cylinder head torque for the Alfa Romeo 6 2.5?
The cylinder head bolts on the Alfa Romeo 6 2.5 (1979–1983) are tightened in 2 stages: 78 Nm, then a final 88 Nm.
What battery does the Alfa Romeo 6 2.5 use?
The Alfa Romeo 6 2.5 (1979–1983) uses a 12 V, 66 Ah battery (reserve capacity 110 minutes).