Chevrolet Spark manuals

Mazda CX-5 Service & Repair Manual: Hydraulic Lash Adjuster, Rocker Arm

Purpose, Function

HLA

Rocker arm

Construction

HLA

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
WARNING: A hot engine can cause severe burns. Turn off the engine and wait until it is cool before servicing. CAUTION: If the camshaft is rotated with the timing chain removed ...

Valve, Valve Spring, Valve Seal, Valve Guide
Purpose, Function Valve The intake valve is pressed down by the cam, the intake air passage is opened, and air is introduced into the cylinder. The exhaust valve is pressed down by ...

Other materials:

Rear Mount Camera Removal/Installation
CAUTION: The audio unit communicates with the rear mount camera and records the presence/non-presence of the rear mount camera when the ignition is switched to ACC or ON (engine off or on) after connecting the negative battery cable. If the commander switch is installed wit ...

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. ...

Cargo Compartment Light
Purpose The cargo compartment light illuminates the cargo room interior when the liftgate is opened. Function When the liftgate is opened, illuminates by the cargo room light switch turning on. Construction The cargo room light is installed to the trunk side tr ...

© 2016-2023 Copyright www.mcx5.org