Alfa Romeo1990–1993Technical specifications

164 3.0: Technical specifications

Workshop data for the 3-litre petrol (engine code 643.01). 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 (643.01) to the vehicle before ordering parts or applying these figures.

Vehicle specifications

Overview

Make: Alfa Romeo
Model: 164
Years: 1990–1993
Fuel: Petrol
Engine code: 643.01

Performance & efficiency

Power: 147 kW (200 hp)
Engine size: 2,959 cc
Cylinders: 6 · OHC
Compression ratio: 10.0:1
Fuel system: Bosch

Fluids & capacities

Engine oil (with the filter): 7.0 litres

All 122 specifications below

Engine & identification

Vehicle identification

No. of cylinders Type	6/OHC
Capacity (Fiscal) cc	2959 (2914)
Compression ratio :1	10,0
Suitable for unleaded petrol	Yes
Minimum octane rating RON	91
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

Firing order

The firing order for the Alfa Romeo 164 3.0 (1990–1993) is 1-4-2-5-3-6.

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

Valve clearances

Valve clearances for the Alfa Romeo 164 3.0 (1990–1993) are 0,48-0,50 mm inlet and 0,23-0,25 mm exhaust, measured cold.

Valve clearance - INLET mm	0,48-0,50 cold
Valve clearance - EXHAUST mm	0,23-0,25 cold

Engine oil & fluids

Engine oil

The Alfa Romeo 164 3.0 (1990–1993) takes 7.0 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 1.5 litres. The specified oil is SAE 75W-90 semi-synthetic.

Coolant

The listed total cooling-system capacity is 13.0 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/A1
Ambient temperature range	-20°C➞
Engine oil grade SAE	10W-40 Synthetic
Engine oil classification API/ACEA	SJ/A3
Engine with filter(s) litres	7.0
Other lubricants and capacities
Manual transmission oil grade SAE	75W-90 Semi-synthetic
Manual transmission litres	1.5
Cooling system - total capacity litres	13.0
Brake fluid Type	DOT 4
Brake fluid litres	0.8
Power steering fluid Type	Dexron II
Power steering fluid litres	1.0

Brakes & wear limits

Brake disc thickness

Brake discs on the Alfa Romeo 164 3.0 (1990–1993) are replaced at a minimum thickness of 20,2 mm (ventilated) front and 9 mm rear.

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

Brake disc and drum dimensions

Disc runout Front	0,03 mm
Disc runout Rear	0,03 mm
Minimum pad thickness Front	2 mm
Minimum pad thickness Rear	2 mm
Parking brake travel No. of notches	3-7

Service & electrical

Ignition timing

The ignition timing on the Alfa Romeo 164 3.0 (1990–1993) is not adjustable.

Ignition timing - basic BTDC °Engine/rpm	Not adjustable

Battery

The Alfa Romeo 164 3.0 (1990–1993) uses a 12 V, 60 Ah battery (reserve capacity 90 minutes).

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

Spark plugs

The Alfa Romeo 164 3.0 (1990–1993) uses NGK PGR6A spark plugs with a 0,7 mm electrode gap.

Spark plugs Original equipment	NGK
Spark plug Type	PGR6A
Electrode gap mm	0,7
Spark plugs Make	Autolite
Spark plug Type	APP3922
Electrode gap mm	0,7
Spark plugs Make	Bosch
Spark plug Type	WR6DC
Electrode gap mm	0,7
Spark plugs Make	Champion
Spark plug Type	RN7YC
Electrode gap mm	0,7
Spark plugs Make	NGK
Spark plug Type	PGR6A
Electrode gap mm	0,7

Tuning and emissions

Ignition advance checks °Engine/rpm	ECM Controlled
Idle speed rpm	700-800 Not adjustable
Oil temperature °C	60
CO level at idle speed - tailpipe (Cat) Vol. % CO	0,2 Max Not adjustable
HC level at idle speed ppm	70 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	0 120 484 004
Alternator output A/V/rpm	85/13,5/3000

Service checks and adjustments

Oil pressure bar/rpm	3,9-5,9/5000
Radiator cap bar	0,90-1,10
Thermostat opens °C	81-85
Drive belt size - alternator mm	9,5x845

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	8-150
Lambda sensor (Oxygen) heater Ohm	3,0-20,0

Tightening torques

Cylinder head bolt torque

The cylinder head bolts on the Alfa Romeo 164 3.0 (1990–1993) are tightened in 4 stages: 30 Nm, then 60 Nm, then 89-98 Nm, then a final 98-108 Nm.

Cylinder head
Renew bolts	No
Tighten	30 Nm
Tighten	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	42-46 Nm
Main bearings Stage 2	84-93 Nm
Big end bearings Renew bolts/nuts	No
Big end bearings Stage 1	26-30 Nm
Big end bearings Stage 2	53-59 Nm
Flywheel/driveplate	113 Nm
Clutch pressure plate	19-25 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	25-34 Nm
Lambda sensor (Oxygen)	50-60 Nm
Chassis tightening torques
Front hub	—
View more information	—
Front hub
Rear hub	250-300 Nm
Steering track rod end	50-60 Nm
Brake disc to hub Front	6-13 Nm
Brake caliper to carrier Front	35 Nm
Brake caliper/carrier to hub Front	—
Carrier to hub
Brake disc to hub Rear	6,2-13 Nm
Brake caliper to carrier Rear	33 Nm
Brake caliper/carrier to hub Rear	—
ABS sensor Front	4-6 Nm
ABS sensor Rear	4-6 Nm
Road wheels	95-105 Nm

Air conditioning

Refrigerant type
Air conditioning refrigerant Type	R12
Air conditioning refrigerant quantity grams	1250
Refrigerant quantity
Air conditioning oil Type	Suniso 5GS
Oil type
Air conditioning oil quantity cm³	—

Frequently asked questions

What is the firing order of the Alfa Romeo 164 3.0?

The firing order for the Alfa Romeo 164 3.0 (1990–1993) is 1-4-2-5-3-6.

What spark plugs does the Alfa Romeo 164 3.0 use?

The Alfa Romeo 164 3.0 (1990–1993) uses NGK PGR6A spark plugs with a 0,7 mm electrode gap.

How much oil does the Alfa Romeo 164 3.0 take?

The Alfa Romeo 164 3.0 (1990–1993) takes 7.0 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 164 3.0?

Valve clearances for the Alfa Romeo 164 3.0 (1990–1993) are 0,48-0,50 mm inlet and 0,23-0,25 mm exhaust, measured cold.

What is the cylinder head torque for the Alfa Romeo 164 3.0?

The cylinder head bolts on the Alfa Romeo 164 3.0 (1990–1993) are tightened in 4 stages: 30 Nm, then 60 Nm, then 89-98 Nm, then a final 98-108 Nm.

What is the ignition timing for the Alfa Romeo 164 3.0?

The ignition timing on the Alfa Romeo 164 3.0 (1990–1993) is not adjustable.