Honda Civic. Manual — part 401

Fig. 3: Identifying Cylinder Head Components (3 Of 3)

CYLINDER HEAD REMOVAL

NOTE:

Use fender covers to avoid damaging painted surfaces.

To avoid damage, unplug the wiring connectors
carefully while holding the connector portion.

To avoid damaging the cylinder head, wait until the
engine coolant temperature drops below 100 °F (38 ° C)
before loosening the cylinder head bolts.

Mark all wiring and hoses to avoid misconnection. Also,

2008 Honda Civic GX

2006-08 ENGINE Cylinder Head - Civic GX

1. Make sure you have anti-theft codes for the audio system and navigation

system (if equipped), then write down the audio presets.

2. Turn off the manual shut-off valve, (see ENGINE REMOVAL ).
3. To reduce pressure in the lines, start the engine, and run it until it stalls.
4. Disconnect the negative cable from the battery.
5. Drain the engine coolant, refer to the COOLANT REPLACEMENT .
6. Remove the drive belt, refer to the DRIVE BELT

REMOVAL/INSTALLATION .

7. Remove the intake manifold (see REMOVAL ).
8. Remove the harness clamps (A), and remove the positive crankcase ventilation

(PCV) hose from the clamp (B).

Fig. 4: Removing Harness Clamps

9. Remove the air cleaner housing bracket (A), then remove the harness holder

(B) from the cylinder head.

be sure that they do not contact other wiring or hoses,
or interfere with other parts.

2008 Honda Civic GX

2006-08 ENGINE Cylinder Head - Civic GX

Fig. 5: Identifying Air Cleaner Housing Bracket

10. Remove the upper radiator hose (A), heater hose (B), and water bypass hose

(C).

Fig. 6: Identifying Upper Radiator Hose, Heater Hose And Water Bypass
Hose

11. Remove the engine wire harness connectors and wire harness clamps from the

cylinder head.

Four fuel injector connectors

Engine coolant temperature (ECT) sensor 1 connector

Air fuel ratio (A/F) sensor connector

Secondary heated oxygen sensor (secondary HO2S) connector

Rocker arm oil control solenoid connector

2008 Honda Civic GX

2006-08 ENGINE Cylinder Head - Civic GX

Rocker arm oil pressure switch connector

12. Remove the four ignition coils, refer to the IGNITION COIL

REMOVAL/INSTALLATION .

13. Remove the three way catalytic converter (TWC) (see CATALYTIC

CONVERTER REMOVAL/INSTALLATION ).

14. Remove the thermostat housing, refer to the THERMOSTAT HOUSING

REMOVAL AND INSTALLATION .

15. Remove the cam chain, refer to the CAM CHAIN REMOVAL .
16. Remove the cylinder head bolts. To prevent warpage, unscrew the bolts, in

sequence, 1/3 of a turn at a time; repeat the sequence until all bolts are
loosened.

Fig. 7: Identifying Loosening Sequence Of Cylinder Head Bolts

17. Remove the cylinder head.

CAMSHAFT INSPECTION

1. Remove the camshaft sprocket, refer to the CAMSHAFT SPROCKET

REMOVAL AND INSTALLATION .

2. Remove the rocker arm assembly, refer to the ROCKER ARM ASSEMBLY

REMOVAL .

3. Put the rocker shaft holders on the cylinder head, then tighten the bolts, in

sequence, to the specified torque.

2008 Honda Civic GX

2006-08 ENGINE Cylinder Head - Civic GX