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Mazda CX-5 Service & Repair Manual: Hydraulic Lash Adjuster (Hla) Removal/Installation

Mazda CX-5 Service & Repair Manual / Engine / Engine Assembly / Valvetrain, Cylinder Head / Hydraulic Lash Adjuster (Hla) Removal/Installation

WARNING:

CAUTION:

NOTE:

1. Disconnect the negative battery cable..

2. Remove the plug hole plate..

3. Remove the ignition coil/ion sensors..

4. Remove the cylinder head cover..

5. Remove the front under cover No.2..

6. Remove the electric variable valve timing motor/driver..

7. Remove the vacuum pump..

8. Remove the high pressure fuel pump and rear housing..

9. Remove in the order indicated in the table.

10. Install in the reverse order of removal.

11. Start the engine and inspect the following:



1

Oil shower pipe

(See Oil Shower Pipe Installation Note.)

2

Timing chain

(See Timing Chain Removal Note.)

(See Timing Chain Installation Note.)

3

Chain guide (No.1)

4

Electric variable valve timing actuator

(See Electric Variable Valve Timing Actuator Removal Note.)

(See Electric Variable Valve Timing Actuator Installation Note.)

5

OCV

6

Camshaft

(See Camshaft Removal Note.)

(See Camshaft Installation Note.)

7

Rocker arm

(See Rocker Arm Removal Note.)

(See Rocker Arm Installation Note.)

8

HLA

(See HLA Removal Note.)

(See HLA Installation Note.)


Timing Chain Removal Note

1. Release the tension on the timing chain using the following procedure:

NOTE:

a. Remove the blind plugs (upper and lower) on the engine front cover service holes.


b. Insert an M6 bolt (35—60 mm {1.4—2.3 in}

length with thread to the end) to the upper service hole and tighten it until it contacts the tensioner arm, then loosen it approx. 180 degrees

. (Set the bolt so that it sits slightly in front of the tensioner arm.)


NOTE:

c. Insert a precision screwdriver into the lower service hole.

d. While moving the exhaust camshaft back and forth in the direction of the arrow using a wrench on the cast hexagon, press down the link plate of the timing chain tensioner using a precision screwdriver and release the plunger lock.



NOTE:

e. With the plunger lock released, rotate the exhaust camshaft clockwise until the timing chain loosens.


f. With the chain loosened, tighten the M6 bolt in the upper service hole so that the bolt is inserted approx. 5 mm {0.2 in}

additionally to secure the tensioner arm.


NOTE:

g. After securing the tensioner arm, remove the chain guide (No.1).

Electric Variable Valve Timing Actuator Removal Note

CAUTION:

1. Rotate the crankshaft clockwise so that cylinder No.1 is positioned around before top dead center (TDC) as shown in the figure.


NOTE:

2. Mark the timing chain and each actuator so that they can be reassembled in the same condition as before removal.


3. Hold the intake camshaft using a wrench on the cast hexagon and remove the electric variable valve timing actuator installation bolt.


4. Using a screwdriver wrapped in a clean cloth, lightly press the electric variable valve timing actuator to the front and separate the intake camshaft and the actuator.


5. Remove the timing chain from the exhaust and intake camshaft sprockets and set is aside, and remove the electric variable valve timing actuator.


6. Return the timing chain to the exhaust camshaft sprocket, and pull the timing chain up and suspend it using a rope as shown in the figure.


Camshaft Removal Note

CAUTION:

NOTE:

1. Leave the timing chain as it is, which was suspended after electric variable valve timing actuator removal.

2. Temporarily install the cylinder head cover bolt to the position shown in the figure to use it for suspending the timing chain.


3. Loosen the camshaft cap bolts in two or three passes in the order shown in the figure, and remove the camshaft cap.


4. Remove the intake camshaft.

5. While setting the timing chain aside, remove the hydraulic variable valve timing actuator and the exhaust camshaft as a single unit.


6. Pull up the timing chain and suspend it using a rope as shown in the figure.


Rocker Arm Removal Note

1. Keep the rocker arms in the order of removal to enable reassembly in their original positions.

HLA Removal Note

1. Keep the HLAs in the order of removal to enable reassembly in their original positions.

HLA Installation Note

1. Perform HLA air bleeding using the following procedure.

a. Put the HLA in a container filled with engine oil.

CAUTION:

b. While lightly pressing the check ball using a round bar (approx. 1.0 mm {0.039 in}

diameter), bleed air by moving the plunger up and down.


c. Press the end of the plunger in the oil and verify that there is no rebounding feel.

2. Visually inspect the HLA surface where it contacts the rocker arm for wear or damage.


3. Assemble the HLAs to their original positions.

Rocker Arm Installation Note

1. Apply engine oil to the HLAs and the end of the valve stems.


2. Install the rocker arms to the same positions as before removal.

Camshaft Installation Note

1. As shown in the figure, apply gear oil (SAE No. 90 or equivalent) or engine oil to the center area of each journal of the cylinder head.


CAUTION:

2. As shown in the figure, align the cam position of cylinder No.1 around top dead center (TDC) and place the intake camshaft on the cylinder head.


3. Remove the rope suspending the timing chain on the exhaust side.

4. While aligning the mark on the timing chain placed during removal with the one on the hydraulic variable valve timing actuator, place the exhaust camshaft component on the cylinder head.


5. As shown in the figure, apply gear oil (SAE No. 90 or equivalent) or engine oil to the center area of each journal of the camshaft.


6. Apply adhesive agent (Loctite 962T) around journal No.6 of the cylinder head or the exhaust-side rear camshaft cap.


CAUTION:

7. Install the camshaft caps in the marked number order, and temporarily tighten the camshaft cap installation bolts in two or three passes evenly.

8. Tighten the camshaft cap installation bolts in two steps in the order shown in the figure.


Electric Variable Valve Timing Actuator Installation Note

1. Remove the rope suspending the timing chain on the intake side.

2. Remove the timing chain from the exhaust and intake camshaft sprockets and set it aside to the rear, then insert the electric variable valve timing actuator between the engine front cover and the cylinder head.


3. Return the timing chain to the exhaust camshaft sprocket.

4. While aligning the mark on the timing chain placed during removal with the one on the electric variable valve timing actuator, engage the chain with the sprocket.


5. Align the knock pin on the end of the intake camshaft with the notch on the actuator side, then assemble the actuator.


NOTE:

6. Hold the intake camshaft using a wrench on the cast hexagon, and tighten the electric variable valve timing actuator installation bolt.


Timing Chain Installation Note

1. Install the chain guide (No.1).

2. Remove the bolt securing the tensioner arm and apply tension to the timing chain.

3. Rotate the crankshaft clockwise two turns and verify that the valve timing is correct.


4. Install the blind plugs (upper and lower) for the engine front cover service holes.


Oil Shower Pipe Installation Note

1. Install the oil shower pipe in the order shown in the figure.


Tightening torque

Installation position

Tightening torque

1

9—12 N·m {92—122 kgf·cm, 80—106 in·lbf}

2, 3

8.0—9.0 N·m {82—91 kgf·cm, 71—79 in·lbf}


Hydraulic Lash Adjuster (Hla) Inspection
HLA Troubleshooting Item Occurrence Possible cause Action 1 After replacing oil, sound occurs when starting engine ...

Hydraulic Lash Adjuster, Rocker Arm
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 roll ...

Other materials:

Refrigerant Line
Purpose The system piping connects each related part of the refrigerant system. Construction Block-type piping has been adopted to the pipe connection, improving the efficiency of piping related servicing. The pipes in the piping system consist of the following parts. ...

After Service Precaution
WARNING: Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. When installing the fuel hose, perform “Fuel Leakage Inspection” described below. A person charged with static electricity could cause a fire or explosion, ...

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 ...

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