Mazda1988–1991Technical specifications

121 1.1: Technical specifications

Workshop data for the 1.1-litre petrol (engine code B1). Covers engine, fluids, brakes, service and torques: the figures to check before a job or a parts order.

Summary

Match the engine code (B1) to the vehicle before ordering parts or applying these figures.

Vehicle specifications

Overview

Make: Mazda
Model: 121
Years: 1988–1991
Fuel: Petrol
Engine code: B1

Performance & efficiency

Power: 42 kW (57 hp)
Engine size: 1,138 cc
Cylinders: 4 · OHC
Compression ratio: 9.4:1
Fuel system: Aisan

Fluids & capacities

Engine oil (with the filter): 3.2 litres

All 122 specifications below

Engine & identification

Vehicle identification

No. of cylinders Type	4/OHC
Capacity (Fiscal) cc	1138 (1125)
Compression ratio :1	9,4
Suitable for unleaded petrol	Yes
Minimum octane rating RON	91
Ignition system Type	TSZ-i
Ignition system Description	Trans-i
Trigger location	Distributor
Fuel system Make	Aisan
Fuel system Type	28-32
Fuel system Description	Carb-2V
Diagnostic socket	Yes

Ignition system

Ignition coil Make	Hanshin
Ignition coil supply voltage + with ballast V	11,0
Primary resistance Ohm	0,8-1,3
Secondary resistance Ohm	6000-30000
Distributor (ECM) Make	Mitsubishi

Firing order

The firing order for the Mazda 121 1.1 (1988–1991) is 1-3-4-2.

Firing order	1-3-4-2

Valve clearances

Valve clearances for the Mazda 121 1.1 (1988–1991) 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 1.1 (1988–1991) takes 3.2 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 listed total cooling-system capacity is 5.0 litres.

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	3.2
Other lubricants and capacities
Manual transmission oil grade SAE	Dexron II
Manual transmission litres	2.5
Cooling system - total capacity litres	5.0
Brake fluid Type	DOT 3/4
Brake fluid litres	0.6
Power steering fluid Type	Dexron II

Brakes & wear limits

Brake disc thickness

Brake discs on the Mazda 121 1.1 (1988–1991) are replaced at a minimum thickness of 11 mm (solid) front; the rear brake drums are replaced at a maximum diameter of 171,5 mm.

Minimum disc thickness for replacement - solid Front	11 mm
Maximum drum diameter for replacement Rear	171,5 mm

Brake disc and drum dimensions

Disc runout Front	0,10 mm
Minimum pad thickness Front	3 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 1.1 (1988–1991) is 4°±1° BTDC at 800 rpm.

Ignition timing	Without vacuum
Ignition timing - basic BTDC °Engine/rpm	4±1/800

Battery

The Mazda 121 1.1 (1988–1991) uses a 12 V, 33 Ah battery (reserve capacity 55 minutes).

Battery V/RC(Ah)	12/55 (33)

Spark plugs

The Mazda 121 1.1 (1988–1991) uses NGK BPR5E-VG spark plugs with a 0,8 mm electrode gap.

Spark plugs Original equipment	NGK
Spark plug Type	BPR5E-VG
Electrode gap mm	0,8
Spark plugs Make	Autolite
Spark plug Type	APP64
Electrode gap mm	0,8
Spark plugs Make	Beru
Spark plug Type	14R-8DU
Electrode gap mm	0,8
Spark plugs Make	Bosch
Spark plug Type	WR8DC
Electrode gap mm	0,8
Spark plugs Make	Champion
Spark plug Type	RN10YC
Electrode gap mm	0,6
Spark plugs Make	NGK
Spark plug Type	BPR5E-VG
Electrode gap mm	0,8

Tuning and emissions

Ignition advance	Without vacuum and basic timing
Ignition advance checks °Engine/rpm	0/1400
Ignition advance checks °Engine/rpm	10-14/3000
Ignition advance checks °Engine/rpm	16-20/5000
Vacuum check	Ignition timing advances
Vacuum range °Engine	16-20
Vacuum starts mbar	160
Vacuum ends mbar	533
Idle speed rpm	800±50
Oil temperature °C	60
CO level at idle speed - tailpipe Vol. % CO	1,5
HC level at idle speed ppm	300
CO2 level at idle speed Vol. % CO2	13-16
O2 level at idle speed Vol. % O2	0,5-2,0

Starting and charging

Starter motor Make	Mitsubishi
Starter motor Type	0,8 kW
Minimum starting voltage V	11,5
Maximum cranking amps A	89-108
Alternator Make	Mitsubishi
Alternator output A/V/rpm	45/14,5/2500
Regulated voltage V	14,4-15,0

Service checks and adjustments

Compression pressure bar	10,0-14,0
Oil pressure bar/rpm	3,4-4,4/3000
Radiator cap bar	0,75-1,05
Thermostat opens °C	81-83
Drive belt size - alternator mm	9,5x888
Drive belt tension - alternator/PAS/AC mm	9-10

Fuel system

Fuel pump delivery pressure bar	0,27-0,33

Tightening torques

Cylinder head bolt torque

The cylinder head bolts on the Mazda 121 1.1 (1988–1991) 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	96-103 Nm
Clutch pressure plate	18-26 Nm
Crankshaft pulley/damper centre bolt	128 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	235 Nm
Steering track rod end	42-57 Nm
Brake caliper/carrier to hub Front	39-49 Nm
Road wheels	88-118 Nm

Frequently asked questions

What is the firing order of the Mazda 121 1.1?

The firing order for the Mazda 121 1.1 (1988–1991) is 1-3-4-2.

What spark plugs does the Mazda 121 1.1 use?

The Mazda 121 1.1 (1988–1991) uses NGK BPR5E-VG spark plugs with a 0,8 mm electrode gap.

How much oil does the Mazda 121 1.1 take?

The Mazda 121 1.1 (1988–1991) takes 3.2 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 1.1?

Valve clearances for the Mazda 121 1.1 (1988–1991) are 0,30 mm inlet and 0,30 mm exhaust, measured hot.

What is the cylinder head torque for the Mazda 121 1.1?

The cylinder head bolts on the Mazda 121 1.1 (1988–1991) 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 1.1?

Basic ignition timing for the Mazda 121 1.1 (1988–1991) is 4°±1° BTDC at 800 rpm.