Engine & identification
Vehicle identification
| No. of cylinders Type | 4/DOHC |
|---|---|
| Capacity (Fiscal) cc | 1242 |
| Compression ratio :1 | 10 |
| Suitable for unleaded petrol | Yes |
| Minimum octane rating RON | 95 |
| Ignition system Make | Ford |
| Ignition system Type | EEC V |
| Ignition system Description | Map-DIS |
| Trigger location | Cam/Crankshaft |
| Fuel system Make | Ford |
| Fuel system Type | EEC-V |
| Fuel system Description | MFI-s |
| Air metering Type | Mass |
| Combined ignition and fuel ECM | Yes |
| Diagnostic socket | Yes |
Ignition system
| Ignition coil supply voltage + with ballast V | 11,0 |
|---|---|
| Primary resistance Ohm | 0,4-0,6 |
| Secondary resistance Ohm | 10500-16500 |
Firing order
The firing order for the Mazda 121 1.25 (1995–2000) is 1-3-4-2.
| Firing order | 1-3-4-2 |
|---|
Valve clearances
Valve clearances for the Mazda 121 1.25 (1995–2000) are 0,17-0,23 mm inlet and 0,27-0,33 mm exhaust, measured cold.
| Valve clearance - INLET mm | 0,17-0,23 cold |
|---|---|
| Valve clearance - EXHAUST mm | 0,27-0,33 cold |
Engine oil & fluids
Engine oil
The Mazda 121 1.25 (1995–2000) takes 4.0 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 2.6 litres. The specified oil is Dexron II.
Grades, filling conditions and capacities
| Engine oil options | |
|---|---|
| Ambient temperature range | -30°C➞ |
| Engine oil grade SAE | 5W-40, 5W-50 |
| Engine oil classification API/ACEA | SJ/A2 |
| Ambient temperature range | -20°C➞ |
| Engine oil grade SAE | 10W-30 |
| Engine oil classification API/ACEA | SJ/A2 |
| Ambient temperature range | -10°C➞ |
| Engine oil grade SAE | 15W-40 |
| Engine oil classification API/ACEA | SJ/A2 |
| Engine with filter(s) litres | 4.0 |
| Other lubricants and capacities | |
| Manual transmission oil grade SAE | Dexron II |
| Manual transmission litres | 2.6 |
| Brake fluid Type | DOT 4 |
| Power steering fluid Type | Dexron II |
Brakes & wear limits
Brake disc thickness
Brake discs on the Mazda 121 1.25 (1995–2000) are replaced at a minimum thickness of 8 mm (solid) or 18 mm (ventilated) front; the rear brake drums are replaced at a maximum diameter of 181 mm.
| Minimum disc thickness for replacement - solid Front | 8 mm |
|---|---|
| Minimum disc thickness for replacement - ventilated Front | 18 mm |
| Maximum drum diameter for replacement Rear | 181 mm |
Brake disc and drum dimensions
| Disc thickness variation Front | 0,020 mm |
|---|---|
| Disc runout Front | 0,10 mm |
| Maximum drum diameter | |
| Minimum pad thickness Front | 1,5 mm |
| Minimum shoe thickness Rear | 1 mm |
| Parking brake travel No. of notches | 6 |
Service & electrical
Ignition timing
The ignition timing on the Mazda 121 1.25 (1995–2000) is not adjustable.
| Ignition timing - basic BTDC °Engine/rpm | Not adjustable |
|---|
Spark plugs
The Mazda 121 1.25 (1995–2000) uses Motorcraft AYRF22PP spark plugs with a 1,3 mm electrode gap.
| Spark plugs Original equipment | Motorcraft |
|---|---|
| Spark plug Type | AYRF22PP |
| Electrode gap mm | 1,3 |
| Spark plugs Make | Autolite |
| Spark plug Type | APP5344 |
| Electrode gap mm | 0,9 |
| Spark plugs Make | Beru |
| Spark plug Type | 14KR-6ZPPV |
| Electrode gap mm | 1,3 |
| Spark plugs Make | Champion |
| Spark plug Type | RE7PYC5 |
| Electrode gap mm | 1,3 |
| Spark plugs Make | NGK |
| Spark plug Type | PTR5A-13 |
| Electrode gap mm | 1,3 |
Tuning and emissions
| Ignition advance checks °Engine/rpm | ECM Controlled |
|---|---|
| Idle speed rpm | 780±25 Not adjustable |
| Oil temperature °C | 80 |
| 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 |
Service checks and adjustments
| Oil pressure bar/rpm | 3,0/2000 |
|---|
Fuel system
| System pressure bar | 3,0 |
|---|---|
| Regulated pressure with vacuum bar | 2,7 |
Tightening torques
Cylinder head bolt torque
The cylinder head bolts on the Mazda 121 1.25 (1995–2000) are tightened in 3 stages: 15 Nm, then 30 Nm, then a final 90°.
| Cylinder head | |
|---|---|
| Renew bolts | No |
| Tighten | 15 Nm |
| Tighten | 30 Nm |
| Tighten | 90° |
| Cylinder head instructions | — |
|---|---|
| Other engine tightening torques | |
| Main bearings Stage 1 | — |
| Measurement of bearing clearance is not possible by normal methods and should not be attempted, as this will result in damage to the cylinder block and crankshaft. If the bearing bolts have been loosened the entire cylinder block and crankshaft must be replaced. | |
| Big end bearings Renew bolts/nuts | No |
| Big end bearings Stage 1 | 8 Nm |
| Big end bearings Stage 2 | 90° |
| Oil pump to cylinder block | 9 Nm |
| Sump bolts | 20 Nm |
| Sump drain bolt | 37 Nm |
| Flywheel/driveplate | 85 Nm |
| Clutch pressure plate | 30 Nm |
| Crankshaft pulley/damper centre bolt | 40 Nm+90° |
| Camshaft sprocket/gear | 60 Nm |
| Camshaft carrier/cap | 1)6 Nm 2)15 Nm |
| Camshaft/rocker cover | 9 Nm |
| Inlet manifold to cylinder head | 53 Nm |
| Exhaust manifold to cylinder head | 53 Nm |
| Spark plugs | 15 Nm |
| Lambda sensor (Oxygen) | 42 Nm |
| Chassis tightening torques | |
| Front hub | 290 Nm |
| Rear hub | 270 Nm |
| Steering track rod end | 36 Nm |
| Brake caliper to carrier Front | 30 Nm |
| Brake caliper/carrier to hub Front | 58 Nm |
| ABS sensor Front | 10 Nm |
| ABS sensor Rear | 10 Nm |
| Road wheels | 85 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 | 740±10 |
| Air conditioning oil group | PAG |
| Air conditioning oil quantity cm³ | 200 |
Frequently asked questions
What is the firing order of the Mazda 121 1.25?
The firing order for the Mazda 121 1.25 (1995–2000) is 1-3-4-2.
What spark plugs does the Mazda 121 1.25 use?
The Mazda 121 1.25 (1995–2000) uses Motorcraft AYRF22PP spark plugs with a 1,3 mm electrode gap.
How much oil does the Mazda 121 1.25 take?
The Mazda 121 1.25 (1995–2000) takes 4.0 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 Mazda 121 1.25?
Valve clearances for the Mazda 121 1.25 (1995–2000) are 0,17-0,23 mm inlet and 0,27-0,33 mm exhaust, measured cold.
What is the cylinder head torque for the Mazda 121 1.25?
The cylinder head bolts on the Mazda 121 1.25 (1995–2000) are tightened in 3 stages: 15 Nm, then 30 Nm, then a final 90°.
What is the ignition timing for the Mazda 121 1.25?
The ignition timing on the Mazda 121 1.25 (1995–2000) is not adjustable.