Mazda1991–1995Technical specifications

121 1.3: Technical specifications

Workshop data for the 1.3-litre petrol (engine code B3). 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 (B3) to the vehicle before ordering parts or applying these figures.

Vehicle specifications

Overview

Make: Mazda
Model: 121
Years: 1991–1995
Fuel: Petrol
Engine code: B3

Performance & efficiency

Power: 53 kW (72 hp)
Engine size: 1,324 cc
Cylinders: 4 · OHC
Compression ratio: 9.4:1
Fuel system: Mazda

Fluids & capacities

Engine oil (with the filter): 3.5 litres

All 132 specifications below

Engine & identification

Vehicle identification

No. of cylinders Type	4/OHC
Capacity (Fiscal) cc	1324 (1313)
Compression ratio :1	9,4
Suitable for unleaded petrol	Yes
Minimum octane rating RON	91
Ignition system Type	ESA
Ignition system Description	Map-i
Trigger location	Distributor
Fuel system Make	Mazda
Fuel system Type	EGI-S
Fuel system Description	TBI-i
Combined ignition and fuel ECM	No
Diagnostic socket	Yes

Ignition system

Ignition coil supply voltage + with ballast V	11,0
Primary resistance Ohm	0,68-0,84
Secondary resistance Ohm	9600-14400

Firing order

The firing order for the Mazda 121 1.3 (1991–1995) is 1-3-4-2.

Firing order	1-3-4-2

Valve clearances

Valve clearances for the Mazda 121 1.3 (1991–1995) are 0,30 mm inlet and 0,30 mm exhaust, measured hot.

Valve clearance - INLET mm	0,30 hot
Valve clearance - EXHAUST mm	0,30 hot

Engine oil & fluids

Engine oil

The Mazda 121 1.3 (1991–1995) takes 3.5 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 2.5 litres. The specified oil is Dexron II.

Coolant

The total cooling-system capacity entries are 5.0 litres without a stated condition; 6.0 litres for AT.

Grades, filling conditions and capacities

Lubricants and capacities — complete reference
Engine oil options
Ambient temperature range	➞-20°C
Engine oil grade SAE	5W-20
Engine oil classification API/ACEA	SJ/A2
Ambient temperature range	➞0°C
Engine oil grade SAE	5W-30
Engine oil classification API/ACEA	SJ/A2
Ambient temperature range	-25°C➞30°C
Engine oil grade SAE	10W-30
Engine oil classification API/ACEA	SJ/A2
Ambient temperature range	-25°C➞
Engine oil grade SAE	10W-40, 10W-50
Engine oil classification API/ACEA	SJ/A2
Ambient temperature range	-10°C➞
Engine oil grade SAE	20W-40, 20W-50
Engine oil classification API/ACEA	SJ/A2
Engine with filter(s) litres	3.5
Other lubricants and capacities
Manual transmission oil grade SAE	Dexron II
Manual transmission litres	2.5
Automatic transmission fluid Type	Dexron II
Automatic transmission (dry fill) litres	6.3
Cooling system - total capacity litres	5,0 AT=6,0
Brake fluid Type	DOT 4
Power steering fluid Type	Dexron II

Brakes & wear limits

Brake disc thickness

Brake discs on the Mazda 121 1.3 (1991–1995) are replaced at a minimum thickness of 10 mm (solid) or 16 mm (ventilated) front; the rear brake drums are replaced at a maximum diameter of 181,5 mm.

Minimum disc thickness for replacement - solid Front	10 mm
Minimum disc thickness for replacement - ventilated Front	16 mm
Maximum drum diameter for replacement Rear	181,5 mm

Brake disc and drum dimensions

Maximum drum diameter
Disc runout Front	0,10 mm
Minimum pad thickness Front	2 mm
Minimum shoe thickness Rear	1 mm
Parking brake travel No. of notches	6-8

Service & electrical

Ignition timing

Basic ignition timing for the Mazda 121 1.3 (1991–1995) is 16°±1° BTDC at 750 rpm.

Ignition timing and idle speed
Ignition timing - basic BTDC °Engine/rpm	16±1/750
Ignition timing - alternative °Engine/rpm	AT=16±1/1100

Battery

The Mazda 121 1.3 (1991–1995) uses a 12 V, 40 Ah battery (reserve capacity 55 minutes).

Battery V/RC(Ah)	12/55 (40)

Spark plugs

The Mazda 121 1.3 (1991–1995) uses NGK BKR5E-11 spark plugs with a 1,1 mm electrode gap.

Spark plugs Original equipment	NGK
Spark plug Type	BKR5E-11
Electrode gap mm	1,1
Spark plugs Make	Autolite
Spark plug Type	APP3924
Electrode gap mm	1,0
Spark plugs Make	Beru
Spark plug Type	14FR-7DUX
Electrode gap mm	1,1
Spark plugs Make	Bosch
Spark plug Type	FR7DCX
Electrode gap mm	1,1
Spark plugs Make	Champion
Spark plug Type	RN9YCC
Electrode gap mm	0,8
Spark plugs Make	NGK
Spark plug Type	BKR5E-11
Electrode gap mm	1,1

Tuning and emissions

Ignition timing and idle speed
Tuning conditions	—
View more information	—
Ignition advance checks °Engine/rpm	ECM Controlled
Idle speed rpm	750-800
Idle speed - alternative rpm	AT=1100/P
Oil temperature °C	60
CO level at idle speed - tailpipe Vol. % CO	0,5 Max Not adjustable
HC level at idle speed ppm	100
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	2500-2800
CO content at increased idle speed Vol. %	0,3
Lambda at increased idle λ	0,97-1,03

Starting and charging

Starter motor Make	Mitsubishi
Minimum starting voltage V	8
Maximum cranking amps A	108-132
Alternator Make	Mitsubishi
Alternator output A/V/rpm	65/14,5/3000
Regulated voltage V	14,1-14,7

Service checks and adjustments

Compression pressure bar	10,3-14,7
Oil pressure bar/rpm	2,9-3,9/3000
Radiator cap bar	0,74-1,03
Thermostat opens °C	87-90
Drive belt tension - alternator/PAS/AC mm	6,0-7,5

Fuel system

Regulated pressure with vacuum bar	2,4-2,8
Engine coolant temperature (ECT) sensor Ohm/°C	290-350/80

Tightening torques

Cylinder head bolt torque

The cylinder head bolts on the Mazda 121 1.3 (1991–1995) are tightened in 3 stages: 30 Nm, then 60 Nm, then a final 76-81 Nm.

Cylinder head
Renew bolts	No
Tighten	30 Nm
Tighten	60 Nm
Tighten	76-81 Nm

Other engine tightening torques
Cylinder head instructions	—
Main bearings Renew bolts/nuts	No
Main bearings Stage 1	27 Nm
Main bearings Stage 2	54-59 Nm
Big end bearings Renew bolts/nuts	No
Big end bearings Stage 1	15 Nm
Big end bearings Stage 2	29-30 Nm
Oil pump to cylinder block	20-25 Nm
Sump bolts	5-10 Nm
Sump drain bolt	30-40 Nm
Flywheel/driveplate	98 Nm/98 Nm
Clutch pressure plate	18-26 Nm
Crankshaft pulley/damper centre bolt	156-166 Nm
Camshaft sprocket/gear	49-61 Nm
Camshaft/rocker cover	5-9 Nm
Inlet manifold to cylinder head	20-25 Nm
Exhaust manifold to cylinder head	15-25 Nm
Spark plugs	15-23 Nm
Chassis tightening torques
Front hub	157-235 Nm
Rear hub	167-215 Nm
Steering track rod end	42-57 Nm
Brake caliper/carrier to hub Front	44 Nm
ABS sensor Front	20 Nm
ABS sensor Rear	20 Nm
Road wheels	88-118 Nm

Air conditioning

No. of AC service connectors	2
Air conditioning restrictor type	Expansion valve
Compressor clutch/magnetic coupling	Yes
Compressor variable displacement solenoid	No
Air conditioning refrigerant Type	R134a
Air conditioning refrigerant quantity grams	650
Air conditioning oil group	PAG
Air conditioning oil Type	Atmos GU 10
Air conditioning oil quantity cm³	175
Air conditioning oil viscosity ISO	46

Frequently asked questions

What is the firing order of the Mazda 121 1.3?

The firing order for the Mazda 121 1.3 (1991–1995) is 1-3-4-2.

What spark plugs does the Mazda 121 1.3 use?

The Mazda 121 1.3 (1991–1995) uses NGK BKR5E-11 spark plugs with a 1,1 mm electrode gap.

How much oil does the Mazda 121 1.3 take?

The Mazda 121 1.3 (1991–1995) takes 3.5 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 Mazda 121 1.3?

Valve clearances for the Mazda 121 1.3 (1991–1995) are 0,30 mm inlet and 0,30 mm exhaust, measured hot.

What is the cylinder head torque for the Mazda 121 1.3?

The cylinder head bolts on the Mazda 121 1.3 (1991–1995) are tightened in 3 stages: 30 Nm, then 60 Nm, then a final 76-81 Nm.

What is the ignition timing for the Mazda 121 1.3?

Basic ignition timing for the Mazda 121 1.3 (1991–1995) is 16°±1° BTDC at 750 rpm.