Engine & identification
Vehicle identification
| No. of cylinders Type | 4/DOHC |
|---|---|
| Capacity cc | 1759 |
| Compression ratio :1 | 14,8 |
Injection system
| Air metering Type | Mass/MAP |
|---|---|
| Pump type | Common rail |
Injection sequence
The injection sequence for the Mazda 3 1.8 (2019–2021) is 1-3-4-2.
| Injection sequence | 1-3-4-2 |
|---|
Valve clearances
Valve clearances on the Mazda 3 1.8 (2019–2021) are hydraulic — they self-adjust, so no manual clearance figure applies.
| Valve clearance - INLET mm | Hydraulic |
|---|---|
| Valve clearance - EXHAUST mm | Hydraulic |
Engine oil & fluids
Engine oil
The Mazda 3 1.8 (2019–2021) takes 5.1 litres of engine oil with the filter.
See the reference table for the complete engine oil entries and their conditions.
Manual gearbox
See the reference table for the complete manual gearbox entries and their conditions.
Coolant
See the reference table for the complete coolant entries and their conditions.
Grades, filling conditions and capacities
| Preferred engine oil | |
|---|---|
| Ambient temperature range | All temperatures |
| Engine oil grade SAE | — |
| Engine oil options | |
| Ambient temperature range | All temperatures |
| Engine oil grade SAE | 0W-30 |
| Engine oil classification API/ACEA | /C3 |
| Ambient temperature range | All temperatures |
| Engine oil grade SAE | 5W-30 |
| Engine oil classification API/ACEA | /C3 |
| Engine with filter(s) litres | 5.1 |
| Other lubricants and capacities | |
| Manual transmission oil grade SAE | Mazda Long Life Gear Oil G7 |
| Manual transmission oil | |
| Manual transmission litres | 1.65 |
| Automatic transmission fluid Type | ATF FZ |
| Automatic transmission (drain & refill) litres | 3.1 |
| View more information | — |
| Checking level | |
| Automatic transmission (dry fill) litres | 7.6 |
| Automatic transmission fluid (ATF) (dry fill) | |
| Coolant Type | FL22 |
| Coolant Colour | Green |
| Cooling system - total capacity litres | MT=6,9-7,0 AT=7,0-7,1 |
| Cooling system | |
| Brake fluid Type | DOT 3/4 |
| Clutch fluid Type | DOT 3/4 |
Brakes & wear limits
Brake disc thickness
Brake discs on the Mazda 3 1.8 (2019–2021) are replaced at a minimum thickness of 23 mm (ventilated) or 23,8 mm (ventilated) front and 7,0 mm or 7,8 mm rear.
| Minimum disc thickness for replacement - ventilated Front | 23 mm |
|---|---|
| Minimum disc thickness after refacing - ventilated Front | 23,8 mm |
| Minimum disc thickness for replacement Rear | 7,0 mm |
| Minimum disc thickness after refacing Rear | 7,8 mm |
Brake disc and drum dimensions
| Disc thickness variation Front | 0,016 mm |
|---|---|
| Disc thickness variation Rear | 0,018 mm |
| Disc runout Front | 0,04 mm |
| Disc runout Rear | 0,1 mm |
| Minimum pad thickness Front | 2 mm |
| Minimum pad thickness Rear | 2 mm |
Service & electrical
Glow plugs
Glow plugs for the Mazda 3 1.8 (2019–2021): Original equipment NGK, Beru GN1012, Champion CH931 and NGK 93218.
| Glow plug nominal rating V/A | 7,0 |
|---|---|
| Glow plug - part no. Original equipment | NGK |
| Glow plug - part no. Beru | GN1012 |
| Glow plug - part no. Champion | CH931 |
| Glow plug - part no. NGK | 93218 |
Tuning and emissions
| Idle speed rpm | 800±50 |
|---|
Starting and charging
| Battery V/RC(Ah) | 12 (60/65) |
|---|
Service checks and adjustments
| Compression pressure bar | 18,8-23,6 |
|---|---|
| Oil pressure bar/rpm | 1,1-1,8/1500 |
| Oil pressure | |
| Radiator cap bar | 0,93-1,23 |
Tightening torques
| Cylinder head instructions | — |
|---|---|
| Cylinder head | |
| Maximum bolt length | 146,5 mm |
| Tighten | 15±2 Nm |
| Tighten | 25±2 Nm |
| Tighten | 90°±5° |
| Tighten | 90°±5° |
| Tighten | 90°±5° |
| Other engine tightening torques | |
| Oil pump to cylinder block | 23±3 Nm |
| Sump bolts | — |
| View more information | — |
| Assemble components within 10 minutes. | |
| Sump drain bolt | 36±5 Nm |
| Flywheel/driveplate | — |
| Flywheel/driveplate | |
| Clutch pressure plate | 29±4 Nm |
| Crankshaft pulley/damper centre bolt | 100±10 Nm+60°±5° |
| Camshaft sprocket/gear | 132±8 Nm |
| Camshaft carrier/cap | 1)5±1 Nm 2)10±1 Nm |
| View more information | — |
| Assemble components within 10 minutes. Excess sealant can cause engine damage. | |
| Camshaft/rocker cover | — |
| View more information | — |
| Assemble components within 10 minutes. | |
| Inlet manifold to cylinder head | 18±2 Nm |
| Exhaust downpipe to manifold | 45±6 Nm |
| Water pump | 10±1 Nm |
| Injector/clamp | 3 Nm+120°±3° |
| Injector pipe unions | 37±5 Nm |
| Fuel/injection pump mounting | 23±3 Nm |
| Glow plugs | 18±2 Nm |
| Crankshaft position (CKP) sensor/engine speed (RPM) sensor | 9±1 Nm |
| Camshaft position (CMP) sensor | 9±1 Nm |
| Engine coolant temperature (ECT) sensor | 15±1 Nm |
| Nitrogen oxide (NOx) sensor | 50±10 Nm |
| Engine oil pressure switch | 16±2 Nm |
| Oil filter | 18±2 Nm |
| Chassis tightening torques | |
| Front hub | — |
| Front/rear hub | |
| Front hub - wheel bearing housing bolts | 150±10 Nm |
| Rear hub - wheel bearing housing bolts | 124±12 Nm |
| Steering wheel | 48±6 Nm |
| Steering rack/box mounting | 124±12 Nm |
| Steering track rod end | 53±6 Nm |
| Steering track rod end | |
| Brake caliper to carrier Front | 28±2 Nm |
| Brake caliper/carrier to hub Front | 101±9 Nm |
| Brake disc to hub Rear | 12±2 Nm |
| Brake caliper to carrier Rear | 28±2 Nm |
| Brake caliper/carrier to hub Rear | 124±12 Nm |
| ABS sensor Front | 9±1 Nm |
| ABS sensor Rear | 9±1 Nm |
| Road wheels | 128±19 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 | — |
| Do not mix R134a with R1234yf. | |
| Air conditioning refrigerant quantity grams | R134a=490±25 R1234yf=480±25 |
| Air conditioning oil group | PAG |
| Air conditioning oil Type | FD46XG |
| Air conditioning oil quantity cm³ | 100 |
| Air conditioning oil viscosity ISO | 46 |
Frequently asked questions
What is the injection sequence of the Mazda 3 1.8?
The injection sequence for the Mazda 3 1.8 (2019–2021) is 1-3-4-2.
What glow plugs does the Mazda 3 1.8 use?
Glow plugs for the Mazda 3 1.8 (2019–2021): Original equipment NGK, Beru GN1012, Champion CH931 and NGK 93218.
How much oil does the Mazda 3 1.8 take?
The Mazda 3 1.8 (2019–2021) takes 5.1 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 3 1.8?
Valve clearances on the Mazda 3 1.8 (2019–2021) are hydraulic — they self-adjust, so no manual clearance figure applies.
What is the minimum brake disc thickness for the Mazda 3 1.8?
Brake discs on the Mazda 3 1.8 (2019–2021) are replaced at a minimum thickness of 23 mm (ventilated) or 23,8 mm (ventilated) front and 7,0 mm or 7,8 mm rear.