Alfa Romeo1987–1991Technical specifications

33 Sprint 1.7: Technical specifications

Workshop data for the 1.7-litre petrol (engine code 305.50). 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 (305.50) to the vehicle before ordering parts or applying these figures.

Vehicle specifications

Overview

Make
Alfa Romeo
Model
33 Sprint
Years
1987–1991
Fuel
Petrol
Engine code
305.50

Performance & efficiency

Power
84 kW (114 hp)
Engine size
1,712 cc
Cylinders
4 · OHC
Compression ratio
9.5:1
Fuel system
Weber/Dellorto

Fluids & capacities

Engine oil (with the filter)
4.0 litres
All 126 specifications below

Engine & identification

Vehicle identification

No. of cylinders Type4/OHC
Capacity (Fiscal) cc1712 (1700)
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 MakeWeber/Dellorto
Fuel system TypeIDF/DRLA
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 Sprint 1.7 (1987–1991) is 1-3-2-4.

Firing order1-3-2-4

Valve clearances

Valve clearances on the Alfa Romeo 33 Sprint 1.7 (1987–1991) 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 Sprint 1.7 (1987–1991) 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 Sprint 1.7 (1987–1991) 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
Parking brake travel No. of notches1-3

Service & electrical

Ignition timing

Basic ignition timing for the Alfa Romeo 33 Sprint 1.7 (1987–1991) is 8°±1° BTDC at 900 rpm.

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

Battery

The Alfa Romeo 33 Sprint 1.7 (1987–1991) uses a 12 V, 60 Ah battery (reserve capacity 90 minutes).

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

Spark plugs

The Alfa Romeo 33 Sprint 1.7 (1987–1991) 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 TypeW6DTC
Electrode gap mm0,8
Spark plugs MakeChampion
Spark plug TypeN6YC
Electrode gap mm0,6
Spark plugs MakeNGK
Spark plug TypeB7ES
Electrode gap mm0,6

Tuning and emissions

Tuning conditions—
CO level
Ignition advanceWithout vacuum and basic timing
Ignition advance checks °Engine/rpm0-3/1000
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 mbar390
Idle speed rpm900-1000
Idle speed - alternative rpm(S/CH)=900
Oil temperature °C70 U-Cat=60
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 V8
Maximum cranking amps A119-145
Alternator MakeBosch
Alternator Type0 120 489 479
Alternator output A/V/rpm36/14/1500
Regulated voltage V13,7-14,5

Service checks and adjustments

Compression pressure bar10,3 Min
Oil pressure bar/rpm4,4/6000
Thermostat opens °C84-88
Drive belt size - alternator mm9,5x850
Drive belt tension - alternator/PAS/AC mm15

Fuel system

Fuel pump delivery pressure bar0,18-0,29

Tightening torques

Cylinder head bolt torque

The cylinder head bolts on the Alfa Romeo 33 Sprint 1.7 (1987–1991) 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 plate15-23 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 hub225-274 Nm
Steering track rod end39-48 Nm
Brake caliper/carrier to hub Front66 Nm
Brake caliper/carrier to hub Rear47 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 Sprint 1.7?

The firing order for the Alfa Romeo 33 Sprint 1.7 (1987–1991) is 1-3-2-4.

What spark plugs does the Alfa Romeo 33 Sprint 1.7 use?

The Alfa Romeo 33 Sprint 1.7 (1987–1991) uses Lodge 25HL spark plugs with a 0,7 mm electrode gap.

How much oil does the Alfa Romeo 33 Sprint 1.7 take?

The Alfa Romeo 33 Sprint 1.7 (1987–1991) 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 Sprint 1.7?

Valve clearances on the Alfa Romeo 33 Sprint 1.7 (1987–1991) are hydraulic — they self-adjust, so no manual clearance figure applies.

What is the cylinder head torque for the Alfa Romeo 33 Sprint 1.7?

The cylinder head bolts on the Alfa Romeo 33 Sprint 1.7 (1987–1991) 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 Sprint 1.7?

Basic ignition timing for the Alfa Romeo 33 Sprint 1.7 (1987–1991) is 8°±1° BTDC at 900 rpm.

More on the 33 Sprint