Alfa Romeo1983–1990Technical specifications

33 1.5 ti: Technical specifications

Workshop data for the 1.5-litre petrol (engine code 305.20). 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 (305.20) to the vehicle before ordering parts or applying these figures.

Vehicle specifications

Overview

Make
Alfa Romeo
Model
33
Years
1983–1990
Fuel
Petrol
Engine code
305.20

Performance & efficiency

Power
66 kW (90 hp)
Engine size
1,490 cc
Cylinders
4 · OHC
Compression ratio
9.0:1
Fuel system
Weber

Fluids & capacities

Engine oil (with the filter)
4.0 litres
All 120 specifications below

Engine & identification

Vehicle identification

No. of cylinders Type4/OHC
Capacity (Fiscal) cc1490 (1474)
Compression ratio :19,0
Suitable for unleaded petrolYes
Minimum octane rating RON98/95
Ignition system MakeBosch
Ignition system TypeTSZ-i
Ignition system DescriptionTrans-i
Trigger locationDistributor
Fuel system MakeWeber
Fuel system Type36 IDF
Fuel system DescriptionCarb-2V
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.0 237 005 004

Firing order

The firing order for the Alfa Romeo 33 1.5 ti (1983–1990) is 1-3-2-4.

Firing order1-3-2-4

Valve clearances

Valve clearances for the Alfa Romeo 33 1.5 ti (1983–1990) are 0,40 mm inlet and 0,50 mm exhaust, measured cold.

Valve clearance - INLET mm0,40 cold
Valve clearance - EXHAUST mm0,50 cold

Engine oil & fluids

Engine oil

The Alfa Romeo 33 1.5 ti (1983–1990) 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.

Coolant

The listed total cooling-system capacity is 7.3 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
Manual transmission litres 2.6
Cooling system - total capacity litres 7.3
Brake fluid Type ATE S

Brakes & wear limits

Brake disc thickness

Brake discs on the Alfa Romeo 33 1.5 ti (1983–1990) 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 1.5 ti (1983–1990) is 8°±1° BTDC at 900 rpm.

Ignition timingWithout vacuum
Ignition timing - basic BTDC °Engine/rpm8±1/900
Ignition timing - alternative °Engine/rpm95=5±1/900

Battery

The Alfa Romeo 33 1.5 ti (1983–1990) uses a 12 V, 36 Ah battery (reserve capacity 65 minutes).

Battery V/RC(Ah)12/65 (36)

Spark plugs

The Alfa Romeo 33 1.5 ti (1983–1990) uses Lodge 25HL spark plugs with a 0,6 mm electrode gap.

Spark plugs Original equipmentLodge
Spark plug Type25HL
Electrode gap mm0,6
Spark plugs MakeAutolite
Spark plug Type63
Electrode gap mm0,7
Spark plugs MakeBosch
Spark plug TypeW6DTC
Electrode gap mm0,8
Spark plugs MakeChampion
Spark plug TypeRN6YC
Electrode gap mm0,6
Spark plugs MakeNGK
Spark plug TypeBP6ES
Electrode gap mm0,8

Tuning and emissions

Ignition advanceWithout vacuum and basic timing
Ignition advance checks °Engine/rpm0-1/850
Ignition advance checks °Engine/rpm7-11/1600
Ignition advance checks °Engine/rpm24-28/3600
Vacuum checkIgnition timing advances
Vacuum range °Engine11-15
Vacuum starts mbar120
Vacuum ends mbar450
Idle speed rpm900-1000
Oil temperature °C70
CO level at idle speed - tailpipe Vol. % CO3,5 Max
CO level at idle speed - tailpipe (Cat) Vol. % CO1,5 Max
HC level at idle speed ppm300
HC level at idle - alternative ppmCat=100
CO2 level at idle speed Vol. % CO213-16
O2 level at idle speed Vol. % O20,5-2,0

Starting and charging

Starter motor MakeBosch
Starter motor Type0 001 211 215
Minimum starting voltage V10,0
Maximum cranking amps A119-145
Alternator MakeBosch
Alternator Type0 120 489 798
Alternator output A/V/rpm45/14/2000
Regulated voltage V13,7-14,5

Service checks and adjustments

Oil pressure bar/rpm4,5 Max
Drive belt size - alternator mm9,5x888

Fuel system

Fuel pump delivery pressure bar0,4

Tightening torques

Cylinder head bolt torque

The cylinder head bolts on the Alfa Romeo 33 1.5 ti (1983–1990) 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/driveplate96-107 Nm
Clutch pressure plate15-23 Nm
Crankshaft pulley/damper centre bolt118-144 Nm
Camshaft sprocket/gear63-70 Nm
Inlet manifold to cylinder head19-24 Nm
Spark plugs25-33 Nm
Chassis tightening torques
Front hub225-274 Nm
Steering track rod end39-48 Nm
Brake caliper/carrier to hub Front66 Nm
Back plate to hub Rear39-48 Nm
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 1.5 ti?

The firing order for the Alfa Romeo 33 1.5 ti (1983–1990) is 1-3-2-4.

What spark plugs does the Alfa Romeo 33 1.5 ti use?

The Alfa Romeo 33 1.5 ti (1983–1990) uses Lodge 25HL spark plugs with a 0,6 mm electrode gap.

How much oil does the Alfa Romeo 33 1.5 ti take?

The Alfa Romeo 33 1.5 ti (1983–1990) 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 1.5 ti?

Valve clearances for the Alfa Romeo 33 1.5 ti (1983–1990) are 0,40 mm inlet and 0,50 mm exhaust, measured cold.

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

The cylinder head bolts on the Alfa Romeo 33 1.5 ti (1983–1990) 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 1.5 ti?

Basic ignition timing for the Alfa Romeo 33 1.5 ti (1983–1990) is 8°±1° BTDC at 900 rpm.

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