Alfa Romeo1985–1991Technical specifications

75 2.5: Technical specifications

Workshop data for the 2.5-litre petrol (engine code 016.46). Covers engine, fluids, brakes, service, torques and air conditioning: the figures to check before a job or a parts order.

Common faults & fixes

Summary

Match the engine code (016.46) to the vehicle before ordering parts or applying these figures.

Vehicle specifications

Overview

Make: Alfa Romeo
Model: 75
Years: 1985–1991
Fuel: Petrol
Engine code: 016.46

Performance & efficiency

Power: 110 kW (150 hp)
Engine size: 2,492 cc
Cylinders: 6 · OHC
Fuel system: Bosch

Fluids & capacities

Engine oil (with the filter): 6.0 litres

All 105 specifications below

Engine & identification

Vehicle identification

No. of cylinders Type	6/OHC
Capacity (Fiscal) cc	2492 (2464)
Suitable for unleaded petrol	Yes
Minimum octane rating RON	95
Ignition system Make	Bosch
Ignition system Type	TSZ-i
Ignition system Description	Trans-i
Trigger location	Distributor
Fuel system Make	Bosch
Fuel system Type	L-Jetronic
Fuel system Description	MFI-i
Air metering Type	Flow
Combined ignition and fuel ECM	No
Diagnostic socket	No

Ignition system

Ignition coil Make	Bosch
Ignition coil Type	0 221 600 002
Ignition coil supply voltage + with ballast V	11,0
Primary resistance Ohm	0,7-1,0
Secondary resistance Ohm	6700-9600
Distributor (ECM) Make	Bosch
Distributor (ECM) No.	0 237 301 008
Contact breaker gap/trigger air gap mm	0,5-0,6

Firing order

The firing order for the Alfa Romeo 75 2.5 (1985–1991) is 1-4-2-5-3-6.

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

Valve clearances

Valve clearances for the Alfa Romeo 75 2.5 (1985–1991) are 0,50 mm inlet and 0,25 mm exhaust, measured cold.

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

Engine oil & fluids

Engine oil

The Alfa Romeo 75 2.5 (1985–1991) takes 6.0 litres of engine oil with the filter.

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

A listed engine oil option is SAE 10W-50 as an alternative for moderate climates, with API/ACEA classification SG/A3.

Manual gearbox

The manual gearbox has a listed capacity of 2.1 litres. The specified oil is SAE 75W-90.

Coolant

The listed total cooling-system capacity is 8.0 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	SG/A2
Ambient temperature range	Moderate climate alternative
Engine oil grade SAE	10W-50
Engine oil classification API/ACEA	SG/A3
Engine with filter(s) litres	6.0
Other lubricants and capacities
Manual transmission oil grade SAE	75W-90
Manual transmission litres	2.1
Cooling system - total capacity litres	8.0

Brakes & wear limits

Brake disc thickness

Brake discs on the Alfa Romeo 75 2.5 (1985–1991) are replaced at a minimum thickness of 9 mm (solid) or 20 mm (ventilated) front and 8 mm rear.

Minimum disc thickness for replacement - solid Front	9 mm
Minimum disc thickness for replacement - ventilated Front	20 mm
Minimum disc thickness for replacement Rear	8 mm

Brake disc and drum dimensions

Parking brake travel No. of notches	4-6

Service & electrical

Ignition timing

Basic ignition timing for the Alfa Romeo 75 2.5 (1985–1991) is 7°±1° BTDC at 900 rpm.

Ignition timing	Without vacuum
Ignition timing - basic BTDC °Engine/rpm	7±1/900

Battery

The Alfa Romeo 75 2.5 (1985–1991) uses a 12 V, 60 Ah battery (reserve capacity 110 minutes).

Battery V/RC(Ah)	12/110 (60)

Spark plugs

The Alfa Romeo 75 2.5 (1985–1991) uses Lodge 2HL-E spark plugs with a 0,7 mm electrode gap.

Spark plugs Original equipment	Lodge
Spark plug Type	2HL-E
Electrode gap mm	0,7
Spark plugs Make	Autolite
Spark plug Type	62
Electrode gap mm	0,7
Spark plugs Make	Bosch
Spark plug Type	W7DC
Electrode gap mm	0,7
Spark plugs Make	Champion
Spark plug Type	RN11YC
Electrode gap mm	0,8
Spark plugs Make	NGK
Spark plug Type	BP7ES
Electrode gap mm	0,8

Tuning and emissions

Ignition advance	Without vacuum and basic timing
Ignition advance checks °Engine/rpm	0-4/1200
Ignition advance checks °Engine/rpm	16-21/2600
Ignition advance checks °Engine/rpm	24-28/4200
Vacuum range °Engine	8-12
Idle speed rpm	800-1000
Fast idle speed - MT/AT rpm	1600
Oil temperature °C	70
CO level at idle speed - tailpipe Vol. % CO	0,5-1,5
CO level at idle speed - tailpipe (Cat) Vol. % CO	1,5 Max
HC level at idle speed ppm	300
HC level at idle - alternative ppm	Cat=100
CO2 level at idle speed Vol. % CO2	13-16
O2 level at idle speed Vol. % O2	0,5-2,0

Starting and charging

Maximum cranking amps A	178-218
Alternator output A/V/rpm	65/14/2000
Regulated voltage V	13,0-14,0

Service checks and adjustments

Oil pressure bar/rpm	4-6/5500

Fuel system

System pressure bar	2,26-2,65
Regulated pressure with vacuum bar	1,20-2,15
Engine coolant temperature (ECT) sensor Ohm/°C	330/80
Injector Ohm	2,0-3,0

Tightening torques

Cylinder head bolt torque

The cylinder head bolts on the Alfa Romeo 75 2.5 (1985–1991) are tightened in 4 stages: 33-35 Nm, then 77-79 Nm, then 82 Nm, then a final 88 Nm.

Cylinder head
Renew bolts	No
Tighten	33-35 Nm
Tighten	77-79 Nm
Run engine	15 minutes
Tighten	82 Nm
Run engine	600 miles/1000 km
Individually slacken off	360°
Tighten	88 Nm

Other engine tightening torques
Cylinder head instructions	—
Main bearings Renew bolts/nuts	No
Main bearings Stage 1	38-40 Nm
Main bearings Stage 2	76-81 Nm
Big end bearings Renew bolts/nuts	No
Big end bearings Stage 1	23-25 Nm
Big end bearings Stage 2	46-51 Nm
Flywheel/driveplate	113 Nm
Crankshaft pulley/damper centre bolt	235 Nm
Camshaft carrier/cap	16-18 Nm
Spark plugs	25-34 Nm
Chassis tightening torques
Rear hub	265-324 Nm
Steering track rod end	45-55 Nm
Brake caliper/carrier to hub Front	80 Nm
Brake caliper/carrier to hub Rear	48 Nm
Road wheels	98 Nm

Air conditioning

Air conditioning refrigerant Type	R12
Air conditioning refrigerant quantity grams	900
Air conditioning oil Type	Suniso 5GS

Frequently asked questions

What is the firing order of the Alfa Romeo 75 2.5?

The firing order for the Alfa Romeo 75 2.5 (1985–1991) is 1-4-2-5-3-6.

What spark plugs does the Alfa Romeo 75 2.5 use?

The Alfa Romeo 75 2.5 (1985–1991) uses Lodge 2HL-E spark plugs with a 0,7 mm electrode gap.

How much oil does the Alfa Romeo 75 2.5 take?

The Alfa Romeo 75 2.5 (1985–1991) takes 6.0 litres of engine oil with the filter. A listed engine oil option is SAE 10W-40 for moderate climates, with API/ACEA classification SG/A2. A listed engine oil option is SAE 10W-50 as an alternative for moderate climates, with API/ACEA classification SG/A3.

What are the valve clearances for the Alfa Romeo 75 2.5?

Valve clearances for the Alfa Romeo 75 2.5 (1985–1991) are 0,50 mm inlet and 0,25 mm exhaust, measured cold.

What is the cylinder head torque for the Alfa Romeo 75 2.5?

The cylinder head bolts on the Alfa Romeo 75 2.5 (1985–1991) are tightened in 4 stages: 33-35 Nm, then 77-79 Nm, then 82 Nm, then a final 88 Nm.

What is the ignition timing for the Alfa Romeo 75 2.5?

Basic ignition timing for the Alfa Romeo 75 2.5 (1985–1991) is 7°±1° BTDC at 900 rpm.