Mazda 3 manuals

Mazda 3 Service Manual: Cylinder Head Gasket Replacement [Mzr 2.0, Mzr 2.5]

Mazda 3 Service Manual / Engine / Engine Assembly / Valvetrain, Cylinder Head / Cylinder Head Gasket Replacement [Mzr 2.0, Mzr 2.5]

WARNING:

1. Remove the timing chain..

2. Remove the generator, but do not remove it from the vehicle. Fix the generator using a rope to prevent it from falling. (MZR 2.5).

3. Remove the exhaust manifold..

4. Remove the intake manifold..

5. Drain the engine coolant..

6. Disconnect the upper radiator hose..

7. Disconnect the water hose..

8. Disconnect the heater hose..

9. Disconnect the wiring harness.

10. To firmly support the engine, first set the engine jack to the oil pan.


11. Remove in the order indicated in the table.

12. Install in the reverse order of removal.

13. Bleed the air from the cooling system..

14. Inspect the compression..



1

OCV

2

Camshaft

(See Camshaft Removal Note.)

(See Camshaft Installation Note.)

3

Cylinder head

(See Cylinder Head Removal Note.)

(See Cylinder Head Installation Note.)

4

Cylinder head gasket

(See Cylinder Head Gasket Installation Note.)


Camshaft Removal Note

NOTE:

1. Loosen the camshaft cap bolts in 2—3 steps in the order shown in the figure.


Cylinder Head Removal Note

1. Loosen the cylinder head bolts in 2—3 steps in the order shown in the figure.


Cylinder Head Gasket Installation Note

1. Apply silicone sealant to the areas shown in the figure.

CAUTION:


2. Install the cylinder block with a new cylinder head gasket.

3. Apply silicone sealant to the areas shown in the figure.


4. Install the cylinder head referring to the Cylinder Head Installation Note.

Cylinder Head Installation Note

1. Measure the length of each cylinder head bolt.


2. Tighten the cylinder head bolts in the order shown in the following 5 steps using the SST (49 D032 316)

.


Camshaft Installation Note

1. Apply the gear oil (SAE No.90 or equivalent) to each journal of the cylinder head as shown in the figure.


2. Set the cam position of No.1 cylinder at the top dead center (TDC) and install the camshaft.

3. Apply the gear oil (SAE No.90 or equivalent) to each journal of the camshaft as shown in the figure.


4. Temporarily tighten the camshaft cap bolts evenly in 2—3 steps.

5. Tighten the camshaft cap bolts in the order shown in the following two steps.


Camshaft Position (CMP) Sensor Removal/Installation [Mzr 2.0, Mzr 2.5]
CAUTION: When replacing the CMP sensor, make sure there is no foreign material on it such as metal shavings. If it is installed with foreign material, the sensor output signal will malfu ...

Valve Clearance Adjustment [Mzr 2.0, Mzr 2.5]
1. Remove the battery cover.. 2. Disconnect the negative battery cable. 3. Remove the plug hole plate.. 4. Disconnect the wiring harness. 5. Remove the ignition coils.. 6. Remove the spark p ...

Other materials:

Transaxle Range (TR) Switch Removal/Installation [FS5 A EL]
CAUTION: Water or foreign objects entering the connector can cause a poor connection or corrosion. Be sure not to drop water or foreign objects on the connector when disconnecting it. 1. Engage the parking brake and use wheel chocks at the front and rear of the wheels. 2. Shi ...

Front Oil Seal Replacement [Mzr 2.0, Mzr 2.5]
1. Remove the battery cover.. 2. Disconnect the negative battery cable.. 3. Remove the plug hole plate.. 4. Disconnect the wiring harness. 5. Remove the ignition coils.. 6. Remove the spark plugs.. 7. Remove the ventilation hose. 8. Remove the oil level gauge. 9. Remove the cylinder ...

Front Fog Light Removal/Installation
Except Mazdaspeed3 1. Disconnect the negative battery cable.. 2. Remove the front bumper.. 3. Pull the wiring harness from the hook in the direction of the arrow shown in the figure and remove it. 4. Disconnect the connector. 5. Pull the wiring harness in the direction of the arrow (2 ...

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