Mazda CX-5 Service & Repair Manual: Cylinder Head

Mazda CX-5 Service & Repair Manual / Engine / Engine Assembly / Valvetrain, Cylinder Head / Cylinder Head

Outline

With the adoption of the rocker arm (built into needle roller bearing), the sliding resistance has been reduced.
With the adoption of the HLA, the valve clearance is maintained at 0 mm at all the times.
The contact point of the rocker arm and cam is lubricated by the engine oil injected from the oil shower pipe.
Because the SKYACTIV-G 2.0 is implemented on the Miller cycle, the intake manifold vacuum is insufficient during the intake valve opening timing. To improve this, the intake manifold vacuum insufficiency is supplemented with the adoption of the vacuum pump..

Purpose, Function

The cylinder head forms the combustion chamber and intake and exhaust ports.

Construction

The lightweight cylinder head is made of aluminum alloy with excellent thermal conductivity.
Designing a compact pentroof combustion chamber and positioning the spark plugs on the top of the combustion chamber has improved the combustion efficiency.
There are two intake valves and two exhaust valves per cylinder for a total of four valves and the intake/exhaust type has been changed to a cross-flow type, improving intake and exhaust efficiency.
High pressurization is achieved by optimizing the intake port shape, improving the tumble ratio, increasing the combustion speed, and suppressing knocking.
With the adoption of plastic region tightening* for the cylinder head bolts, axial force has been stabilized.

* Plastic region tightening is a method of controlling the tightening using the rotation angle of a bolt. By tightening to the region (plastic tightening region) in which bolt deformation does not become irreversible, variation in axial force is suppressed.

Cylinder Head Gasket

Purpose, Function The cylinder head gasket is installed between the cylinder head and cylinder block to prevent leakage of air-fuel mixture, combustion gas, engine oil, and engine coolant ...

Hydraulic Lash Adjuster (Hla) Inspection

HLA Troubleshooting Item Occurrence Possible cause Action 1 After replacing oil, sound occurs when starting engine ...

Other materials:

Non Return Valve Inspection
WARNING: Fuel is very flammable liquid. If fuel spills or leaks from the pressurized fuel system, it will cause serious injury or death and facility breakage. Fuel can also irritate skin and eyes. To prevent this, always complete the “Fuel Line Safety Procedure”, while referring ...

Starter [Skyactiv G 2.0]
Purpose, Function The starter rotates the crankshaft via the ring gear and it serves as a trigger to start the engine. Construction The starter is installed to the rear part of the engine on the left side. The starter is a coaxial reduction type which can obt ...

Auto Light System
Outline The auto light system automatically turns the TNS and headlights on/off according to the illumination level above and in front of the vehicle. The auto light system is controlled by the front body control module (FBCM). The front body control module (FBCM) performs ...