Alfa Romeo1990–1994Technical specifications

33 Sport Wagon 1.5: Technical specifications

Workshop data for the 1.5-litre petrol (engine code 307.51). Covers engine, fluids, brakes, service, torques and air conditioning: the figures to check before a job or a parts order.

Summary

Match the engine code (307.51) to the vehicle before ordering parts or applying these figures.

Vehicle specifications

Overview

Make
Alfa Romeo
Model
33 Sport Wagon
Years
1990–1994
Fuel
Petrol
Engine code
307.51

Performance & efficiency

Power
70 kW (95 hp)
Engine size
1,490 cc
Cylinders
4 · OHC
Compression ratio
9.5:1
Fuel system
Bosch

Fluids & capacities

Engine oil (with the filter)
4.0 litres
All 133 specifications below

Engine & identification

Vehicle identification

No. of cylinders Type4/OHC
Capacity (Fiscal) cc1490 (1474)
Compression ratio :19,5
Suitable for unleaded petrolYes
Minimum octane rating RON95
Ignition system MakeBosch
Ignition system TypeTSZ-i
Ignition system DescriptionTrans-i
Trigger locationDistributor
Fuel system MakeBosch
Fuel system TypeL3-Jetronic
Fuel system DescriptionMFI-i
Air metering TypeFlow
Combined ignition and fuel ECMNo
Diagnostic socketNo

Ignition system

Ignition coil MakeBosch
Ignition coil Type0 221 600 002
Ignition coil supply voltage + with ballast V11,0
Primary resistance Ohm0,7-1,0
Secondary resistance Ohm6700-9600
Distributor (ECM) MakeBosch
Distributor (ECM) No.0 237 507 009

Firing order

The firing order for the Alfa Romeo 33 Sport Wagon 1.5 (1990–1994) is 1-3-2-4.

Firing order1-3-2-4

Valve clearances

Valve clearances on the Alfa Romeo 33 Sport Wagon 1.5 (1990–1994) are hydraulic — they self-adjust, so no manual clearance figure applies.

Valve clearance - INLET mmHydraulic
Valve clearance - EXHAUST mmHydraulic

Engine oil & fluids

Engine oil

The Alfa Romeo 33 Sport Wagon 1.5 (1990–1994) takes 4.0 litres of engine oil with the filter.

A listed engine oil option is SAE 10W-30 for cold climates, with API/ACEA classification SH/A2.

A listed engine oil option is SAE 10W-40 for moderate climates, with API/ACEA classification SH/A2.

A listed engine oil option is SAE 10W-40 as an alternative for moderate climates, with API/ACEA classification SH/A3.

A listed engine oil option is SAE 20W-50 for hot climates, with API/ACEA classification SH/A2.

Manual gearbox

The manual gearbox has a listed capacity of 2.6 litres. The specified oil is SAE 75W-90 semi-synthetic.

Coolant

The listed total cooling-system capacity is 7.8 litres.

Grades, filling conditions and capacities

Lubricants and capacities — complete reference
Engine oil options
Ambient temperature range Cold climate
Engine oil grade SAE 10W-30
Engine oil classification API/ACEA SH/A2
Ambient temperature range Moderate climate
Engine oil grade SAE 10W-40
Engine oil classification API/ACEA SH/A2
Ambient temperature range Moderate climate alternative
Engine oil grade SAE 10W-40
Engine oil classification API/ACEA SH/A3
Ambient temperature range Hot climate
Engine oil grade SAE 20W-50
Engine oil classification API/ACEA SH/A2
Engine with filter(s) litres 4.0
Other lubricants and capacities
Manual transmission oil grade SAE 75W-90 Semi-synthetic
Manual transmission litres 2.6
Differential oil grade - rear SAE 80W-90
Differential rear litres 1.0
Cooling system - total capacity litres 7.8
Brake fluid Type ATE S

Brakes & wear limits

Brake disc thickness

Brake discs on the Alfa Romeo 33 Sport Wagon 1.5 (1990–1994) are replaced at a minimum thickness of 9 mm (solid) or 20,2 mm (ventilated) front and 9,2 mm rear.

Minimum disc thickness for replacement - solid Front9 mm
Minimum disc thickness for replacement - ventilated Front20,2 mm
Minimum disc thickness for replacement Rear9,2 mm
Maximum drum diameter for replacement Rear229,6 mm

Brake disc and drum dimensions

Disc runout Front0,03 mm
Maximum rear drum diameter
Minimum pad thickness Front7 mm
Minimum pad/shoe thickness
Minimum shoe thickness Rear0,5 mm
Parking brake travel No. of notches1-3

Service & electrical

Ignition timing

Basic ignition timing for the Alfa Romeo 33 Sport Wagon 1.5 (1990–1994) is 8°±1° BTDC at 900 rpm.

Ignition timing
Ignition timingWithout vacuum
Ignition timing - basic BTDC °Engine/rpm8±1/900

Battery

The Alfa Romeo 33 Sport Wagon 1.5 (1990–1994) uses a 12 V, 50 Ah battery (reserve capacity 80 minutes).

Battery V/RC(Ah)12/80 (50)

Spark plugs

The Alfa Romeo 33 Sport Wagon 1.5 (1990–1994) uses Lodge 25HL spark plugs with a 0,7 mm electrode gap.

Spark plugs Original equipmentLodge
Spark plug Type25HL
Electrode gap mm0,7
Spark plugs MakeAutolite
Spark plug TypeAPP62
Electrode gap mm0,6
Spark plugs MakeBeru
Spark plug Type14-5DU
Electrode gap mm0,7
Spark plugs MakeBosch
Spark plug TypeW5DC 04.92-=W6DC
Electrode gap mm0,7
Spark plugs MakeChampion
Spark plug TypeN6YC
Electrode gap mm0,6
Spark plugs MakeNGK
Spark plug TypeBP6E-VG
Electrode gap mm0,7

Tuning and emissions

Tuning conditions—
View more information—
Ignition timing
Ignition advanceWithout vacuum and basic timing
Ignition advance checks °Engine/rpm0-2/3000
Ignition advance checks °Engine/rpm4-10/4000
Ignition advance checks °Engine/rpm16-20/6000
Vacuum checkIgnition timing advances
Vacuum range °Engine16-20
Vacuum starts mbar100
Vacuum ends mbar400
Idle speed rpm900-1050
Oil temperature °C60
CO level at idle speed - tailpipe Vol. % CO0,5 Max
HC level at idle speed ppm50 Max
CO2 level at idle speed Vol. % CO214,5-16
O2 level at idle speed Vol. % O20,1-0,5
Increased idle speed for CO test rpm2500-2900
CO content at increased idle speed Vol. %0,3
Lambda at increased idle λ0,97-1,03

Starting and charging

Starter motor MakeBosch
Starter motor Type0 001 113 004
Maximum cranking amps A135-165
Alternator MakeBosch
Alternator Type0 120 488 118
Alternator output A/V/rpm65/13,5/3000
Regulated voltage V13,7-14,5

Service checks and adjustments

Compression pressure bar10,3 Min

Fuel system

System pressure bar2,8-3,2
Regulated pressure with vacuum bar2,3-2,7
Engine coolant temperature (ECT) sensor Ohm/°C300/80
Injector Ohm14,0-16,0
Injector opening duration (hot) ms/rpm2-10/900
Idle air control (IAC) valve/idle speed control (ISC) actuator Ohm40,0-75,0
Lambda sensor (Oxygen) heater Ohm3,0-20,0

Tightening torques

Cylinder head bolt torque

The cylinder head bolts on the Alfa Romeo 33 Sport Wagon 1.5 (1990–1994) are tightened in 3 stages: 40-60 Nm, then 81-87 Nm, then a final 81-87 Nm.

Cylinder head
Renew boltsNo
Tighten40-60 Nm
Tighten81-87 Nm
Run engine15 minutes
Wait120 minutes
Individually slacken off360°
Tighten81-87 Nm
Cylinder head instructions—
Other engine tightening torques
Main bearings Renew bolts/nutsNo
Main bearings Stage 1—
View more information—
Main bearings
Big end bearings Renew bolts/nutsNo
Big end bearings Stage 122-24 Nm
Big end bearings Stage 243-48 Nm
Sump bolts8-10 Nm
Flywheel/driveplate94-105 Nm
Clutch pressure plate12-23 Nm
Crankshaft pulley/damper centre bolt118-144 Nm
Camshaft sprocket/gear63-70 Nm
Inlet manifold to cylinder head19-24 Nm
Spark plugs25-34 Nm
Chassis tightening torques
Front hub427-472 Nm
Rear hub—
Rear hub
Steering track rod end39-48 Nm
Brake caliper/carrier to hub Front66 Nm
Brake caliper to carrier Rear33 Nm
Brake caliper/carrier to hub Rear47 Nm
Back plate to hub Rear39-48 Nm
Backplate to hub
Road wheels88-108 Nm

Air conditioning

Air conditioning refrigerant TypeR12
Air conditioning refrigerant quantity grams1150
Air conditioning oil TypeSuniso 5GS

Frequently asked questions

What is the firing order of the Alfa Romeo 33 Sport Wagon 1.5?

The firing order for the Alfa Romeo 33 Sport Wagon 1.5 (1990–1994) is 1-3-2-4.

What spark plugs does the Alfa Romeo 33 Sport Wagon 1.5 use?

The Alfa Romeo 33 Sport Wagon 1.5 (1990–1994) uses Lodge 25HL spark plugs with a 0,7 mm electrode gap.

How much oil does the Alfa Romeo 33 Sport Wagon 1.5 take?

The Alfa Romeo 33 Sport Wagon 1.5 (1990–1994) takes 4.0 litres of engine oil with the filter. A listed engine oil option is SAE 10W-30 for cold climates, with API/ACEA classification SH/A2. A listed engine oil option is SAE 10W-40 for moderate climates, with API/ACEA classification SH/A2. A listed engine oil option is SAE 10W-40 as an alternative for moderate climates, with API/ACEA classification SH/A3. A listed engine oil option is SAE 20W-50 for hot climates, with API/ACEA classification SH/A2.

What are the valve clearances for the Alfa Romeo 33 Sport Wagon 1.5?

Valve clearances on the Alfa Romeo 33 Sport Wagon 1.5 (1990–1994) are hydraulic — they self-adjust, so no manual clearance figure applies.

What is the cylinder head torque for the Alfa Romeo 33 Sport Wagon 1.5?

The cylinder head bolts on the Alfa Romeo 33 Sport Wagon 1.5 (1990–1994) are tightened in 3 stages: 40-60 Nm, then 81-87 Nm, then a final 81-87 Nm.

What is the ignition timing for the Alfa Romeo 33 Sport Wagon 1.5?

Basic ignition timing for the Alfa Romeo 33 Sport Wagon 1.5 (1990–1994) is 8°±1° BTDC at 900 rpm.

More on the 33 Sport Wagon