Engine & identification
Vehicle identification
| No. of cylinders Type | 4/DOHC |
|---|---|
| Capacity (Fiscal) cc | 1998 |
| Compression ratio :1 | 15,0 |
| Suitable for unleaded petrol | Yes |
| Minimum octane rating RON | 95 |
| Ignition system Description | Map-DI |
| Trigger location | Cam/Crankshaft |
| Fuel system Make | Mazda |
| Fuel system Description | MFI-s(d) |
| Air metering Type | Mass/MAP |
| Combined ignition and fuel ECM | Yes |
| Diagnostic socket | Yes |
Ignition system
| Ignition coil Make | Mazda |
|---|---|
| Ignition coil Type | HF02-18-100 |
| Ignition coil supply voltage + with ballast V | 12,0 |
Firing order
The firing order for the Mazda 3 2.0 MHEV (2021–2026) is 1-3-4-2.
| Firing order | 1-3-4-2 |
|---|
Valve clearances
Valve clearances on the Mazda 3 2.0 MHEV (2021–2026) 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 2.0 MHEV (2021–2026) takes 4.6 litres of engine oil with the filter.
The preferred engine oil is SAE 0W-20 for all ambient temperatures.
A listed engine oil option is SAE 0W-20 for all ambient temperatures, with API/ACEA classification SN.
Manual gearbox
See the reference table for the complete manual gearbox entries and their conditions.
Transfer box
See the reference table for the complete transfer box 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 | 0W-20 |
| Engine oil options | |
| Ambient temperature range | All temperatures |
| Engine oil grade SAE | 0W-20 |
| Engine oil classification API/ACEA | SN |
| Engine with filter(s) litres | 4.6 |
| Other lubricants and capacities | |
| Manual transmission oil grade SAE | Mazda Long Life Gear Oil G7 |
| Manual transmission oil | |
| Manual transmission litres | 1,65 4x4=1,7 |
| Automatic transmission fluid Type | ATF A7 |
| Automatic transmission (drain & refill) litres | 2.8 |
| View more information | — |
| Checking level | |
| Automatic transmission (dry fill) litres | 7.6 |
| Automatic transmission fluid (ATF) (dry fill) | |
| Differential oil classification - rear | Mazda Long Life Hypoid Gear Oil SG1 |
| Differential rear litres | 0.35 |
| Transfer box oil classification | Mazda Long Life Hypoid Gear Oil SG1 |
| Transfer box litres | 0.35 |
| Coolant Type | FL22 |
| Coolant Colour | Green |
| Cooling system - total capacity litres | — |
| Cooling system | |
| Brake fluid Type | — |
| Brake fluid classification | |
| Clutch fluid Type | — |
Brakes & wear limits
Brake disc thickness
Brake discs on the Mazda 3 2.0 MHEV (2021–2026) 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
Spark plugs
The Mazda 3 2.0 MHEV (2021–2026) uses Bosch 0 242 140 566 spark plugs with a 0,7 mm electrode gap.
| Spark plugs Original equipment | Mazda |
|---|---|
| Spark plug Type | HF01-18-110 |
| Electrode gap mm | 0,5-0,8 |
| Spark plugs Make | Bosch |
| Spark plug Type | 0 242 140 566 |
| Electrode gap mm | 0,7 |
Tuning and emissions
| Tuning conditions | — |
|---|---|
| Idle speed and ignition timing | |
| Ignition timing - basic BTDC °Engine/rpm | 0/600 Not adjustable |
| Ignition timing - alternative °Engine/rpm | AC=0/725 Not adjustable |
| Ignition advance checks °Engine/rpm | ECM Controlled |
| Idle speed rpm | 600±50 Not adjustable |
| Idle speed - alternative rpm | AC=725±75 Not adjustable |
Starting and charging
| Battery V/RC(Ah) | 12 (60/65) |
|---|
Service checks and adjustments
| Compression pressure bar | 6,8-9,8 |
|---|---|
| Oil pressure bar/rpm | 0,9-1,1/1500 |
| Oil pressure | |
| Radiator cap bar | 0,93-1,22 |
| Thermostat opens °C | 64-67 |
Fuel system
| Fuel feed/lift pump delivery pressure bar | 5,5-7,0 |
|---|---|
| Engine coolant temperature (ECT) sensor Ohm/°C | 318/80 |
| Injector Ohm | 2,2-3,3 |
| Throttle motor Ohm | 0,3-100/20°C |
Tightening torques
| Cylinder head instructions | — |
|---|---|
| View more information | — |
| Cylinder head | |
| Maximum bolt length | 155,5 mm |
| Tighten | 15±2 Nm |
| Tighten | 30±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. Excess sealant can cause engine damage. | |
| Sump drain bolt | 36±5 Nm |
| Flywheel/driveplate | 1)50±4 Nm 2)80±4 Nm 3)156±4 Nm/112±4 Nm |
| Clutch pressure plate | 29±4 Nm |
| Crankshaft pulley/damper centre bolt | 110±10 Nm+60°±5° |
| Camshaft sprocket/gear | 108±6 Nm |
| Camshaft carrier/cap | 1)5±1 Nm 2)10±1 Nm |
| Camshaft/rocker cover | — |
| View more information | — |
| Assemble components within 10 minutes. Excess sealant can cause engine damage. | |
| Inlet manifold to cylinder head | 23±3 Nm |
| Exhaust manifold to cylinder head | 51±6 Nm |
| Exhaust downpipe to manifold | 16±2 Nm |
| Water pump | 11±1 Nm |
| Spark 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 |
| Engine coolant temperature (ECT) sensor | |
| Lambda sensor (Oxygen) | 42±12 Nm |
| Nitrogen oxide (NOx) sensor | 50±10 Nm |
| Engine oil pressure switch | 10±1 Nm |
| Oil filter | 14±2 Nm |
| Chassis tightening torques | |
| Front hub | — |
| Front hub | |
| Front hub - wheel bearing housing bolts | 150±10 Nm |
| Rear hub | 4x4= |
| Front/rear hub | |
| 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 | 124±6 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 firing order of the Mazda 3 2.0 MHEV?
The firing order for the Mazda 3 2.0 MHEV (2021–2026) is 1-3-4-2.
What spark plugs does the Mazda 3 2.0 MHEV use?
The Mazda 3 2.0 MHEV (2021–2026) uses Bosch 0 242 140 566 spark plugs with a 0,7 mm electrode gap.
How much oil does the Mazda 3 2.0 MHEV take?
The Mazda 3 2.0 MHEV (2021–2026) takes 4.6 litres of engine oil with the filter. The preferred engine oil is SAE 0W-20 for all ambient temperatures. A listed engine oil option is SAE 0W-20 for all ambient temperatures, with API/ACEA classification SN.
What are the valve clearances for the Mazda 3 2.0 MHEV?
Valve clearances on the Mazda 3 2.0 MHEV (2021–2026) are hydraulic — they self-adjust, so no manual clearance figure applies.
What is the minimum brake disc thickness for the Mazda 3 2.0 MHEV?
Brake discs on the Mazda 3 2.0 MHEV (2021–2026) 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.