Mazda2008–2013Technical specifications

CX-9 3.7: Technical specifications

Workshop data for the 3.7-litre petrol (engine code MZI-3.7). Covers engine, fluids, brakes, service, torques and air conditioning: the figures to check before a job or a parts order.

Common faults & fixes

Summary

Match the engine code (MZI-3.7) to the vehicle before ordering parts or applying these figures.

Vehicle specifications

Overview

Make
Mazda
Model
CX-9
Years
2008–2013
Fuel
Petrol
Engine code
MZI-3.7

Performance & efficiency

Power
204 kW (277 hp)
Engine size
3,726 cc
Cylinders
6 · DOHC
Compression ratio
10.3:1
Fuel system
Mazda

Fluids & capacities

Engine oil (with the filter)
5.2 litres
All 134 specifications below

Engine & identification

Vehicle identification

No. of cylinders Type6/DOHC
Capacity (Fiscal) cc3726
Compression ratio :110,3
Suitable for unleaded petrolYes
Minimum octane rating RON91
Ignition system MakeMazda
Ignition system DescriptionMap-DI
Trigger locationCam/Crankshaft
Fuel system MakeMazda
Fuel system DescriptionMFI-s
Air metering TypeMass
Combined ignition and fuel ECMYes
Diagnostic socketYes

Ignition system

Ignition coil supply voltage + with ballast V12,0
Secondary resistance Ohm5000-6000

Firing order

The firing order for the Mazda CX-9 3.7 (2008–2013) is 1-4-2-5-3-6.

Firing order1-4-2-5-3-6

Valve clearances

Valve clearances for the Mazda CX-9 3.7 (2008–2013) are 0,15-0,25 mm inlet and 0,30-0,40 mm exhaust, measured cold.

Valve clearance - INLET mm0,15-0,25 cold
Valve clearance - EXHAUST mm0,30-0,40 cold

Engine oil & fluids

Engine oil

The Mazda CX-9 3.7 (2008–2013) takes 5.2 litres of engine oil with the filter.

See the reference table for the complete engine oil 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

Lubricants and capacities — complete reference
Engine oil options
Ambient temperature range ➞40°C
Engine oil grade SAE 5W-20, 5W-30
Engine oil classification API/ACEA SL/A3, A5
Ambient temperature range ➞40°C
Engine oil grade SAE 5W-40
Engine oil classification API/ACEA SL/A3, A5
Ambient temperature range -25°C➞40°C
Engine oil grade SAE 10W-30
Engine oil classification API/ACEA SL/A3, A5
Ambient temperature range -25°C➞45°C
Engine oil grade SAE 10W-40
Engine oil classification API/ACEA SL/A3, A5
Engine with filter(s) litres 5.2
Other lubricants and capacities
Automatic transmission fluid Type JWS 3309
Automatic transmission (drain & refill) litres —
View more information —
Ensure quantity of transmission fluid exceeds that held within the level tube.
Automatic transmission (dry fill) litres —
View more information —
Differential oil grade - rear SAE 80W-90
Differential oil classification - rear GL-5
Differential rear litres 1.0
Transfer box oil grade SAE 75W-140 Synthetic
Transfer box oil classification GL-5
Transfer box litres 0.6
Coolant Type Ethylene glycol
Cooling system - total capacity litres 13.3
Brake fluid Type DOT 3
Power steering fluid Type Dexron II
Power steering fluid litres 0.7

Brakes & wear limits

Brake disc thickness

Brake discs on the Mazda CX-9 3.7 (2008–2013) are replaced at a minimum thickness of 26 mm (ventilated) front and 16 mm rear.

Minimum disc thickness for replacement - ventilated Front26 mm
Minimum disc thickness for replacement Rear16 mm
Maximum drum diameter for replacement Rear191 mm

Brake disc and drum dimensions

Disc thickness variation Front0,015 mm
Disc thickness variation Rear0,015 mm
Disc runout Front0,05 mm
Disc runout Rear0,05 mm
Minimum pad thickness Front2 mm
Minimum pad thickness Rear2 mm
Minimum shoe thickness Rear1 mm
Parking brake travel No. of notches1-3

Service & electrical

Battery

The Mazda CX-9 3.7 (2008–2013) uses a 12 V, 55 Ah battery.

Battery V/RC(Ah)12 (55)

Tuning and emissions

Ignition timing - basic BTDC °Engine/rpm13/620±50 Not adjustable
Ignition advance checks °Engine/rpmECM Controlled
Idle speed rpm620±50 Not adjustable
Idle speed - alternative rpmAC=710±140 Not adjustable
Oil temperature °C80
CO level at idle speed - tailpipe Vol. % CO0,2 Max Not adjustable
HC level at idle speed ppm100
CO2 level at idle speed Vol. % CO214,5-16
O2 level at idle speed Vol. % O20,1-0,5
Increased idle speed for CO test rpm2500-3000
CO content at increased idle speed Vol. %0,2
Lambda at increased idle λ0,97-1,03

Starting and charging

Maximum cranking amps A90
Alternator output A/V/rpm77/13,5/2500

Service checks and adjustments

Compression pressure bar9,2-11,6
Oil pressure bar/rpm3,1-6,2/2000
Radiator cap bar0,93-1,22
Thermostat opens °C80-84

Fuel system

System pressure bar3,3-4,8
Engine coolant temperature (ECT) sensor Ohm/°C3775/80
Crankshaft position (CKP) sensor/engine speed (RPM) sensor Ohm800-1320/28°C
Injector Ohm11,3-12,7
Lambda sensor (Oxygen) heater Ohm3,0-30,0
Throttle motor Ohm1-900

Spark plugs

Spark plugs Original equipmentMazda
Spark plug TypeCY01 18 110
Electrode gap mm1,3-1,4

Tightening torques

Cylinder head bolt torque

The cylinder head bolts on the Mazda CX-9 3.7 (2008–2013) are tightened in 5 stages: 20 Nm, then 35 Nm, then 90°, then 90°, then a final 90°.

Cylinder head
Renew boltsYes
Tighten20 Nm
Tighten35 Nm
Tighten90°
Tighten90°
Tighten90°
TightenM8=11 Nm
Cylinder head instructions—
Other engine tightening torques
Main bearings Renew bolts/nutsYes
Big end bearings Renew bolts/nutsYes
Oil pump to cylinder block10 Nm
Sump bolts—
View more information—
Sump bolts
Sump drain bolt27 Nm
Flywheel/driveplate80±7 Nm
Crankshaft pulley/damper centre bolt—
Crankshaft pulley/damper centre bolt
Camshaft sprocket/gear—
Camshaft sprocket/gear
Camshaft carrier/cap10 Nm
Camshaft/rocker cover10 Nm
Inlet manifold to cylinder head10 Nm
Exhaust manifold to cylinder head25±3 Nm
Exhaust downpipe to manifold40±6 Nm
Water pump10 Nm
Spark plugs15±5 Nm
Fuel rail10 Nm
Crankshaft position (CKP) sensor/engine speed (RPM) sensor7 Nm
Camshaft position (CMP) sensor10 Nm
Engine coolant temperature (ECT) sensor10 Nm
Lambda sensor (Oxygen)47±7 Nm
Knock sensor (KS)20±3 Nm
Engine oil pressure switch14±4 Nm
Chassis tightening torques
Front hub255±20 Nm
Bolts/nuts
Rear hub255±20 Nm
Rear hub - wheel bearing housing bolts122±9 Nm
Steering wheel44±5 Nm
Steering rack/box mounting117±19 Nm
Steering track rod end53±6 Nm
Brake disc to hub Front14 Nm
Brake caliper to carrier Front88±5 Nm
Brake caliper/carrier to hub Front117±10 Nm
Brake disc to hub Rear14 Nm
Brake caliper to carrier Rear26±5 Nm
Brake caliper/carrier to hub Rear90±11 Nm
Back plate to hub Rear122±9 Nm
ABS sensor Front11 Nm
ABS sensor Rear11 Nm
Road wheels128±19 Nm

Air conditioning

No. of AC service connectors2
Air conditioning restrictor typeExpansion valve
Compressor clutch/magnetic couplingYes
Compressor variable displacement solenoidNo
Air conditioning refrigerant TypeR134a
Air conditioning refrigerant quantity grams685±25
Air conditioning oil groupPAG
Air conditioning oil TypeDens Oil 8
Air conditioning oil quantity cm³160
Air conditioning oil viscosity ISO46

Frequently asked questions

What is the firing order of the Mazda CX-9 3.7?

The firing order for the Mazda CX-9 3.7 (2008–2013) is 1-4-2-5-3-6.

How much oil does the Mazda CX-9 3.7 take?

The Mazda CX-9 3.7 (2008–2013) takes 5.2 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 CX-9 3.7?

Valve clearances for the Mazda CX-9 3.7 (2008–2013) are 0,15-0,25 mm inlet and 0,30-0,40 mm exhaust, measured cold.

What is the cylinder head torque for the Mazda CX-9 3.7?

The cylinder head bolts on the Mazda CX-9 3.7 (2008–2013) are tightened in 5 stages: 20 Nm, then 35 Nm, then 90°, then 90°, then a final 90°.

What is the minimum brake disc thickness for the Mazda CX-9 3.7?

Brake discs on the Mazda CX-9 3.7 (2008–2013) are replaced at a minimum thickness of 26 mm (ventilated) front and 16 mm rear.

What battery does the Mazda CX-9 3.7 use?

The Mazda CX-9 3.7 (2008–2013) uses a 12 V, 55 Ah battery.