Mazda CX-5 Service & Repair Manual: Valve, Valve Spring, Valve Seal, Valve Guide
Purpose, Function
Valve
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The intake valve is pressed down by the cam, the intake air passage is opened, and air is introduced into the cylinder.
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The exhaust valve is pressed down by the cam, the exhaust air passage is opened, and combustion gas is exhausted from the cylinder.
Valve spring
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The valve spring adheres to the valve seat by pulling up the valve by spring force, and air tightness in the combustion chamber is maintained.
Valve seal
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The valve seal prevents engine oil from entering combustion chamber through the valve guide, and engine oil consumption is suppressed.
Valve guide
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The valve guide maintains the valve stem to open and close the valve smoothly.
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The valve guide cools the valve by transmitting valve heat to the cylinder head.
Construction
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The valve, valve spring, valve seal, and valve guide are assembled to the cylinder head as a single unit.
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The sliding resistance has been reduced by setting the valve spring load to the required minimum.
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The intake valve and exhaust valve are subjected to a salt-bath, soft-nitriding treatment to enhance wear resistance.
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Unequal pitch valve spring has been adopted. In addition, the upper diameter is smaller compared to the bottom diameter.
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The valve guide is made of sintered alloy with excellent wear resistance.
Hydraulic Lash Adjuster, Rocker Arm
Purpose, Function
HLA
The HLA maintains the valve clearance at a constant 0 mm and maintenance-free
valve clearance is realized.
Rocker arm
With the adoption of the needle roll ...
Other materials:
AWD
All-Wheel Drive (AWD) Operation
• AWD provides excellent drivability
on snow-covered and ice-packed roads, sand and mud, as well as on steep slopes and
other slippery surfaces.
• A system malfunction or operation conditions
are indicated by a warning.
Refer to Warning/Indicator Light ...
Rear View Monitor
Rear View Monitor
The rear view monitor is a visual assist system when reversing the vehicle that
provides images from the rear of the vehicle.
WARNING
Always drive carefully confirming the safety of the rear and the surrounding
conditions by looking directly with your eyes:
Reversing the ve ...
Charging System Warning Light
Purpose, Function
Warns the driver of a charging system malfunction.
Construction
The charging system warning light is built into the instrument cluster..
Operation
Illuminates when a malfunction occurs in the charging system and DTCs is
stored in the PCM.
...