Engine & identification
Vehicle identification
| No. of cylinders Type | 2 |
|---|---|
| Capacity (Fiscal) cc | 982 |
| Compression ratio :1 | 9,4 |
| Suitable for unleaded petrol | No |
| Minimum octane rating RON | 98 |
| Ignition system Type | SZ |
| Ignition system Description | CB |
| Fuel system Make | Zenith |
| Fuel system Description | Carb-VV |
Ignition system
| Ignition coil Type | HP5-13J |
|---|---|
| Ballast resistance Ohm | 1,4 |
| Primary resistance Ohm | 1,35 |
| Contact breaker gap/trigger air gap mm | 0,4-0,5 |
| Dwell angle °(%) | 55-61 (61-68) |
Firing order
The firing order for the Mazda RX3 1.0 (1972–1976) is 1-2.
| Firing order | 1-2 |
|---|
Engine oil & fluids
Engine oil
The Mazda RX3 1.0 (1972–1976) takes 5.0 litres of engine oil with the filter. The specified engine oil grade is SAE 10W-40 for moderate climates, with API/ACEA classification SF.
Manual gearbox
The manual gearbox has a listed capacity of 1.5 litres.
Coolant
The listed total cooling-system capacity is 7.5 litres.
Grades, filling conditions and capacities
| Engine oil options | |
|---|---|
| Ambient temperature range | Moderate climate |
| Engine oil grade SAE | 10W-40 |
| Engine oil classification API/ACEA | SF |
| Engine with filter(s) litres | 5.0 |
| Other lubricants and capacities | |
| Manual transmission litres | 1.5 |
| Differential front/AT litres | 6.2 |
| Differential rear litres | 1.5 |
| Cooling system - total capacity litres | 7.5 |
Service & electrical
Spark plugs
The Mazda RX3 1.0 (1972–1976) uses NGK B7EM spark plugs with a 0,6 mm electrode gap.
| Spark plugs Original equipment | NGK |
|---|---|
| Spark plug Type | B7EM |
| Electrode gap mm | 0,6 |
| Spark plugs Make | Champion |
| Spark plug Type | RN180B |
| Electrode gap mm | 0,6 |
| Spark plugs Make | NGK |
| Spark plug Type | B7EM |
| Electrode gap mm | 0,6 |
Tuning and emissions
| Static timing | 0 (L) |
|---|---|
| Ignition advance | Without vacuum and basic timing |
| Ignition advance checks °Engine/rpm | 2-6/1800 |
| Ignition advance checks °Engine/rpm | 6-10/2600 |
| Ignition advance checks °Engine/rpm | 14-16/4000 |
| Vacuum range °Engine | 19-25 |
| Vacuum starts mbar | 202 |
| Vacuum ends mbar | 533 |
| Idle speed rpm | 700 |
| Idle speed - alternative rpm | AT=700/D |
| Oil temperature °C | 60 |
| HC level at idle speed ppm | 500 |
| CO2 level at idle speed Vol. % CO2 | 13-16 |
| O2 level at idle speed Vol. % O2 | 0,5-2,0 |
Starting and charging
| Battery V/RC(Ah) | 12/90 (45-65) |
|---|---|
| Starter motor Make | Mitsubishi |
| Minimum starting voltage V | 9 |
| Maximum cranking amps A | 162-198 |
| Regulated voltage V | 13,5-14,5 |
Service checks and adjustments
| Compression pressure bar | 6,0 |
|---|---|
| Drive belt tension - alternator/PAS/AC mm | 12-14 |
Fuel system
| Fuel pump delivery pressure bar | 0,2-0,3 |
|---|
Tightening torques
Cylinder head bolt torque
The cylinder head bolt torque for the Mazda RX3 1.0 (1972–1976) is 25 Nm.
| Cylinder head | |
|---|---|
| Tighten | 25 Nm |
| Cylinder head instructions | — |
|---|---|
| Other engine tightening torques | |
| Flywheel/driveplate | 450 Nm |
| Spark plugs | 15 Nm |
| Chassis tightening torques | |
| Road wheels | 90 Nm |
Frequently asked questions
What is the firing order of the Mazda RX3 1.0?
The firing order for the Mazda RX3 1.0 (1972–1976) is 1-2.
What spark plugs does the Mazda RX3 1.0 use?
The Mazda RX3 1.0 (1972–1976) uses NGK B7EM spark plugs with a 0,6 mm electrode gap.
How much oil does the Mazda RX3 1.0 take?
The Mazda RX3 1.0 (1972–1976) takes 5.0 litres of engine oil with the filter. The specified engine oil grade is SAE 10W-40 for moderate climates, with API/ACEA classification SF.
What is the cylinder head torque for the Mazda RX3 1.0?
The cylinder head bolt torque for the Mazda RX3 1.0 (1972–1976) is 25 Nm.