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:
Rear Wiper System
Outline
Equipped with continuous, auto-stop, intermittent wiper, and synchronized
washer and wiper operation.
The front body control module (FBCM) performs rear wiper and washer system
fail-safe..
Structural View
System Wiring Diagram
Operation
Continuous operat ...
Multiplex Communication System
A controller area network (CAN) system has been adopted in which multiplex
communication is performed using a single communication path.
A high-speed controller area network (HS-CAN) has been adopted for the communication
between the following modules:
PCM
...
Ion Sensor
Purpose/Function
Detects ion generation in the combustion chamber for detecting pre-ignition.
Detects ions which occur due to fuel combustion as current by applying bias
voltage to the spark plug, which is amplified in the ignition coil internal
circuit and input to the PCM.
...
