Alfa Romeo1990–1994Technical specifications

SZ 3.0: Technical specifications

Workshop data for the 3-litre petrol (engine code 615.01). Covers engine, fluids, service and torques: the figures to check before a job or a parts order.

Common faults & fixes

Summary

Match the engine code (615.01) to the vehicle before ordering parts or applying these figures.

Vehicle specifications

Overview

Make: Alfa Romeo
Model: SZ
Years: 1990–1994
Fuel: Petrol
Engine code: 615.01

Performance & efficiency

Power: 152 kW (207 hp)
Engine size: 2,959 cc
Cylinders: 6 · OHC
Compression ratio: 10.0:1
Fuel system: Bosch

Fluids & capacities

Engine oil (with the filter): 6.0 litres

All 86 specifications below

Engine & identification

Vehicle identification

No. of cylinders Type	6/OHC
Capacity (Fiscal) cc	2959 (2934)
Compression ratio :1	10,0
Suitable for unleaded petrol	Yes
Minimum octane rating RON	95
Ignition system Make	Bosch
Ignition system Type	Motronic ML4.1
Ignition system Description	Map-i
Trigger location	Crankshaft
Fuel system Make	Bosch
Fuel system Type	Motronic ML4.1
Fuel system Description	MFI-i
Air metering Type	Flow
Combined ignition and fuel ECM	Yes
Diagnostic socket	No

Ignition system

Ignition coil Make	Bosch
Ignition coil Type	0 221 122 344
Ignition coil supply voltage + with ballast V	12,0
Primary resistance Ohm	0,45-0,55
Secondary resistance Ohm	5400-6600
Distributor (ECM) Make	Bosch
Distributor (ECM) No.	(0 261 200 141)

Firing order

The firing order for the Alfa Romeo SZ 3.0 (1990–1994) is 1-4-2-5-3-6.

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

Valve clearances

Valve clearances for the Alfa Romeo SZ 3.0 (1990–1994) 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 SZ 3.0 (1990–1994) takes 6.0 litres of engine oil with the filter. The specified engine oil grade is SAE 10W-40 for moderate climates, with API/ACEA classification SF.

Manual gearbox

The manual gearbox has a listed capacity of 3.1 litres. The specified oil is SAE 85W-90.

Coolant

The listed total cooling-system capacity is 10.0 litres.

Grades, filling conditions and capacities

Lubricants and capacities — complete reference
Engine oil options
Ambient temperature range	Moderate climate
Engine oil grade SAE	10W-40
Engine oil classification API/ACEA	SF
Engine with filter(s) litres	6.0
Other lubricants and capacities
Manual transmission oil grade SAE	85W-90
Manual transmission litres	3.1
Cooling system - total capacity litres	10.0

Service & electrical

Battery

The Alfa Romeo SZ 3.0 (1990–1994) uses a 12 V, 60 Ah battery (reserve capacity 90 minutes).

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

Spark plugs

The Alfa Romeo SZ 3.0 (1990–1994) uses Lodge 2HL spark plugs with a 0,7 mm electrode gap.

Spark plugs Original equipment	Lodge
Spark plug Type	2HL
Electrode gap mm	0,7
Spark plugs Make	Autolite
Spark plug Type	AP3923
Electrode gap mm	0,7
Spark plugs Make	NGK
Spark plug Type	PGR6A
Electrode gap mm	0,7

Tuning and emissions

Ignition timing - basic BTDC °Engine/rpm	7,5±1/850
Ignition advance checks °Engine/rpm	ECM Controlled
Idle speed rpm	850-900
Oil temperature °C	60
CO level at idle speed - tailpipe (Cat) Vol. % CO	0,2 Max Not adjustable
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	0 001 111 071
Minimum starting voltage V	10
Maximum cranking amps A	162-198
Alternator Make	Bosch
Alternator Type	0 120 488 103
Alternator output A/V/rpm	43/14/2100
Regulated voltage V	13,0-14,0

Service checks and adjustments

Oil pressure bar/rpm	3,4-4,9/5500
Radiator cap bar	0,90-1,10
Thermostat opens °C	81-85

Fuel system

System pressure bar	3,0
Regulated pressure with vacuum bar	2,5
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	8-150
Lambda sensor (Oxygen) heater Ohm	3,0-20,0

Tightening torques

Other engine tightening torques
Cylinder head instructions	—
Main bearings Stage 1	—
Main bearings
Big end bearings Stage 1	27-30 Nm
Big end bearings Stage 2	54-59 Nm
Flywheel/driveplate	113 Nm
Clutch pressure plate	13-16 Nm
Crankshaft pulley/damper centre bolt	235 Nm
Camshaft sprocket/gear	97-117 Nm
Camshaft carrier/cap	16-18 Nm
Spark plugs	25-34 Nm
Lambda sensor (Oxygen)	50 Nm
Knock sensor (KS)	5-10 Nm
Chassis tightening torques
Rear hub	270-330 Nm
Steering track rod end	45-55 Nm
Brake caliper/carrier to hub Front	80 Nm
Brake caliper/carrier to hub Rear	50 Nm
Road wheels	88-107 Nm

Frequently asked questions

What is the firing order of the Alfa Romeo SZ 3.0?

The firing order for the Alfa Romeo SZ 3.0 (1990–1994) is 1-4-2-5-3-6.

What spark plugs does the Alfa Romeo SZ 3.0 use?

The Alfa Romeo SZ 3.0 (1990–1994) uses Lodge 2HL spark plugs with a 0,7 mm electrode gap.

How much oil does the Alfa Romeo SZ 3.0 take?

The Alfa Romeo SZ 3.0 (1990–1994) takes 6.0 litres of engine oil with the filter. The specified engine oil grade is SAE 10W-40 for moderate climates, with API/ACEA classification SF.

What are the valve clearances for the Alfa Romeo SZ 3.0?

Valve clearances for the Alfa Romeo SZ 3.0 (1990–1994) are 0,48-0,50 mm inlet and 0,31-0,34 mm exhaust, measured cold.

What battery does the Alfa Romeo SZ 3.0 use?

The Alfa Romeo SZ 3.0 (1990–1994) uses a 12 V, 60 Ah battery (reserve capacity 90 minutes).