Alfa Romeo1992–1997Technical specifications

155 2.5: Technical specifications

Workshop data for the 2.5-litre petrol (engine code 673.01). Covers engine, fluids, brakes, service, torques and air conditioning: the figures to check before a job or a parts order.

Common faults & fixes

Summary

Match the engine code (673.01) to the vehicle before ordering parts or applying these figures.

Vehicle specifications

Overview

Make: Alfa Romeo
Model: 155
Years: 1992–1997
Fuel: Petrol
Engine code: 673.01

Performance & efficiency

Power: 121 kW (165 hp)
Engine size: 2,492 cc
Cylinders: 6 · OHC
Compression ratio: 10.0:1
Fuel system: Bosch

Fluids & capacities

Engine oil (with the filter): 6.0 litres

All 126 specifications below

Engine & identification

Vehicle identification

No. of cylinders Type	6/OHC
Capacity (Fiscal) cc	2492 (2464)
Compression ratio :1	10,0
Suitable for unleaded petrol	Yes
Minimum octane rating RON	95
Ignition system Make	Bosch
Ignition system Type	Motronic M1.7
Ignition system Description	Map-DIS
Trigger location	Crankshaft
Fuel system Make	Bosch
Fuel system Type	Motronic M1.7
Fuel system Description	MFI-i
Air metering Type	Flow
Combined ignition and fuel ECM	Yes
Diagnostic socket	Yes

Ignition system

Ignition coil Make	Bosch
Ignition coil Type	0 221 503 417
Ignition coil supply voltage + with ballast V	11,0
Primary resistance Ohm	0,5
Secondary resistance Ohm	13300
Distributor (ECM) Make	Bosch

Firing order

The firing order for the Alfa Romeo 155 2.5 (1992–1997) is 1-4-2-5-3-6.

Firing order	1-4-2-5-3-6

Valve clearances

Valve clearances for the Alfa Romeo 155 2.5 (1992–1997) are 0,48-0,50 mm inlet and 0,31-0,34 mm exhaust, measured cold.

Valve clearance - INLET mm	0,48-0,50 cold
Valve clearance - EXHAUST mm	0,31-0,34 cold

Engine oil & fluids

Engine oil

The Alfa Romeo 155 2.5 (1992–1997) takes 6.0 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 2.0 litres. The specified oil is SAE 75W-90 semi-synthetic.

Coolant

The listed total cooling-system capacity is 9.2 litres.

Grades, filling conditions and capacities

Lubricants and capacities — complete reference
Engine oil options
Ambient temperature range	All temperatures
Engine oil grade SAE	5W-30 Synthetic
Engine oil classification API/ACEA	SJ
Ambient temperature range	-20°C➞
Engine oil grade SAE	10W-40 Synthetic
Engine oil classification API/ACEA	SJ/A3
Engine with filter(s) litres	6.0
Other lubricants and capacities
Manual transmission oil grade SAE	75W-90 Semi-synthetic
Manual transmission litres	2.0
Cooling system - total capacity litres	9.2
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 2.5 (1992–1997) are replaced at a minimum thickness of 20,2 mm (ventilated) front and 9,2 mm rear.

Minimum disc thickness for replacement - ventilated Front	20,2 mm
Minimum disc thickness for replacement Rear	9,2 mm

Brake disc and drum dimensions

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

Ignition timing

The ignition timing on the Alfa Romeo 155 2.5 (1992–1997) is not adjustable.

Ignition timing - basic BTDC °Engine/rpm	Not adjustable

Battery

The Alfa Romeo 155 2.5 (1992–1997) uses a 12 V, 60 Ah battery (reserve capacity 90 minutes).

Battery V/RC(Ah)	12/90 (60)

Spark plugs

The Alfa Romeo 155 2.5 (1992–1997) uses Autolite APP63 spark plugs with a 0,7 mm electrode gap.

Spark plugs Original equipment	Lodge
Spark plug Type	2HL
Spark plugs Make	Autolite
Spark plug Type	APP63
Electrode gap mm	0,7
Spark plugs Make	Beru
Spark plug Type	14R-6DU
Electrode gap mm	0,8
Spark plugs Make	Bosch
Spark plug Type	W5DC
Electrode gap mm	0,7
Spark plugs Make	Champion
Spark plug Type	RN7YCC
Electrode gap mm	0,8
Spark plugs Make	NGK
Spark plug Type	BPR7E
Electrode gap mm	0,7

Tuning and emissions

Ignition advance checks °Engine/rpm	ECM Controlled
Idle speed rpm	750±50 Not adjustable
Oil temperature °C	60
CO level at idle speed - tailpipe Vol. % CO	0,5 Max Not adjustable
HC level at idle speed ppm	50 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	0 001 108 048
Maximum cranking amps A	162-198
Alternator Make	Bosch
Alternator Type	0 120 485 026
Alternator output A/V/rpm	40/14/1600

Service checks and adjustments

Oil pressure bar/rpm	5,0/4000
Radiator cap bar	0,88-1,08
Thermostat opens °C	85-89

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	330/80
Crankshaft position (CKP) sensor/engine speed (RPM) sensor Ohm	500-1600
Injector Ohm	16,0
Idle air control (IAC) valve/idle speed control (ISC) actuator Ohm	13,0-26,0
Lambda sensor (Oxygen) heater Ohm	3,0

Tightening torques

Cylinder head bolt torque

The cylinder head bolts on the Alfa Romeo 155 2.5 (1992–1997) are tightened in 3 stages: 40-60 Nm, then 89-98 Nm, then a final 98-108 Nm.

Cylinder head
Renew bolts	No
Tighten	40-60 Nm
Tighten	89-98 Nm
Run engine	600 miles/1000 km
Individually slacken off	360°
Tighten	98-108 Nm

Other engine tightening torques
Cylinder head instructions	—
Main bearings Renew bolts/nuts	No
Main bearings Stage 1	42-47 Nm
Main bearings Stage 2	84-93 Nm
Big end bearings Renew bolts/nuts	No
Big end bearings Stage 1	27-30 Nm
Big end bearings Stage 2	53-59 Nm
Sump drain bolt	64-79 Nm
Flywheel/driveplate	113 Nm
Clutch pressure plate	18-22 Nm
Crankshaft pulley/damper centre bolt	235 Nm
Camshaft sprocket/gear	97-117 Nm
Camshaft carrier/cap	16-18 Nm
Camshaft/rocker cover	9-11 Nm
Spark plugs	27-34 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	29-36 Nm
Brake disc to hub Front	5-13 Nm
Brake caliper to carrier Front	95 Nm
Brake caliper/carrier to hub Front	—
Carrier to hub
Brake disc to hub Rear	5,4-12,6 Nm
Brake caliper to carrier Rear	50 Nm
Brake caliper/carrier to hub Rear	—
Road wheels	82±9 Nm Alu=93±10 Nm

Air conditioning

Refrigerant type
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
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 2.5?

The firing order for the Alfa Romeo 155 2.5 (1992–1997) is 1-4-2-5-3-6.

What spark plugs does the Alfa Romeo 155 2.5 use?

The Alfa Romeo 155 2.5 (1992–1997) uses Autolite APP63 spark plugs with a 0,7 mm electrode gap.

How much oil does the Alfa Romeo 155 2.5 take?

The Alfa Romeo 155 2.5 (1992–1997) takes 6.0 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 2.5?

Valve clearances for the Alfa Romeo 155 2.5 (1992–1997) are 0,48-0,50 mm inlet and 0,31-0,34 mm exhaust, measured cold.

What is the cylinder head torque for the Alfa Romeo 155 2.5?

The cylinder head bolts on the Alfa Romeo 155 2.5 (1992–1997) are tightened in 3 stages: 40-60 Nm, then 89-98 Nm, then a final 98-108 Nm.

What is the ignition timing for the Alfa Romeo 155 2.5?

The ignition timing on the Alfa Romeo 155 2.5 (1992–1997) is not adjustable.