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 roller bearing built into the rocker arm, the contact to the cam employs rolling contact to reduce sliding resistance.
Construction
HLA
The HLA is installed to the cylinder head.
Rocker arm
The rocker arm is installed to the HLA and upper area of the valve.
The needle roller bearing is built into the rocker arm.
Operation
Before valve opening
1. The plunger presses up the rocker arm by the spring force of the plunger spring to maintain the valve clearance at 0 mm.
During valve opening
1. If the cam presses down the rocker arm, load is applied to the plunger and valve.
2. If load is applied to the plunger, the hydraulic pressure in the high pressure chamber (A chamber) increases and the check ball closes the hydraulic passage.
3. If the hydraulic passage is closed, the plunger is fixed becoming the rocker arm pivot point because the volume of the engine oil in the high pressure chamber is not changed.
4. The rocker arm presses down the valve.
After valve opening
1. If load is not applied to the plunger, the plunger spring presses up the plunger (maintains valve clearance at 0 mm).
2. Because the capacity of the high pressure chamber (A chamber) increases in Step 1, the check ball is opened and engine oil flows from the reserve chamber (B chamber) to the high pressure chamber (A chamber) to prepare for the next step.
3. The oil in the reserve chamber (B chamber) which is decreased by supplying it to the high pressure chamber (A chamber), is supplied from the oil passage of the cylinder head.
Transfer Removal/Installation [Fw6 Ax EL]
CAUTION:
Performing the following procedures without first removing the front ABS
wheel-speed sensor may possibly cause an open circuit in the harness if it is
pulled by mistake. Before performing the following procedures, disconnect the
front ABS wheel-speed sensor (axle side) and ...
Steering Wheel
Steering Wheel
WARNING
Never adjust the steering wheel while the vehicle is moving: Adjusting the steering
wheel while the vehicle is moving is dangerous.
Moving it can very easily cause the driver to abruptly turn to the left or right.
This can lead to loss of control or an accident.
Steeri ...
Electrical Fan Control [Skyactiv G 2.0]
Outline
Through cooling of the radiator and condenser by operation of the cooling
fan according to vehicle conditions, engine reliability and cooling performance
have been improved.
Block Diagram
Operation
The PCM determines the demand airflow volume by the following c ...