Chevrolet Spark manuals

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

Purpose, Function


Rocker arm



Rocker arm


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:

Oil Shower Pipe
Outline Mechanical resistance loss has been reduced through structural changes to achieve optimum fuel economy. An oil shower pipe has been adopted as a part of this structural change. Purpose, Function The oil shower pipe injects engine oil to lubricate the contact points ...

Seat Belt
Fastening the Seat Belt Position the lap belt as low as possible, not on the abdominal area, then adjust the shoulder belt so that it fits snugly against your body. Unfastening the Seat Belt Depress the button on the seat belt buckle. If the belt does not fully retract, pull it out and che ...

Panel Light Control Indicator Alarm
Purpose The panel light control indicator alarm notifies the driver that the panel light brightness is either at maximum or minimum. Function If the panel light control switch is in the maximum rotation position right or left when the TNS switch ON signal (TNS and headlight ...

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