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.
Headlight Aiming
NOTE:
Perform headlight aiming if any of the following work is performed.
Front combination light replacement
Work that can affect vehicle height such as suspension replacement or
removal/installation.
1. Empty the vehicle by having all occupants leav ...
Inspection Of SST (Deployment Tool) [Two Step Deployment Control System]
1. Before using the SST (49 H066 002), inspect its operation.
Inspection Procedure
1. Follow the steps below to inspect the SST (49 H066 002).
If not as indicated in the table, replace the SST (49 H066 002) because
it has a malfunction.
WARNING:
Do not use a malfu ...
Brake Fluid Pressure Sensor
Purpose/Function
The brake fluid pressure sensor detects the fluid pressure from the master
cylinder and transmits it to the DSC HU/CM.
Construction
The brake fluid pressure sensor is built into the DSC HU/CM. Therefore if
there is any malfunction of the brake fluid pressur ...