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.

Hydraulic Lash Adjuster (Hla) Removal/Installation
Valve, Valve Spring, Valve Seal, Valve GuideBumper Stiffener Lower Removal/Installation
1. Disconnect the negative battery cable..
2. Remove the following parts:
a. Seal board upper.
b. Front bumper.
c. Seal plate.
d. Front under cover No.1.
3. Remove bolts A.
4. Pull the bumper stiffener lower in the direction of the arrow (1), (2) shown
in the figure, detach hooks ...
Quick Release (Fuel System) Connector
Purpose, Function
Serviceability has been improved by the easy disconnection/connection.
Construction
The following types of the quick release connectors are used.
U.S.A. and CANADA
Except U.S.A. and CANADA
Type A
An SST is not used with this type.
...
Engine Oil Solenoid Valve
Purpose, Function
The engine oil solenoid valve switches the hydraulic transmission passage
in accordance with the driving conditions and the oil pump drive resistance
is reduced by controlling oil pump discharging pressure in two steps.
Construction
The engine oil solenoid ...