Cylinder Head, Removal and Installation
COMPONENT NOTES AND INFORMATION
Installing cylinder head cover, refer to Installation. Service and Repair
1 Bolt
- Tighten to: 20 Nm (15 ft. lbs.)
2 Intake manifold
3 Bolt
- Tighten to: 10 Nm (7 ft. lbs.)
4 Cover
5 Bolt
- Tighten to: 10 Nm (7 ft. lbs.)
6 Cylinder head bolt
- Always replace
- Tightening, refer to Procedures below.
7 Pressure Relief Valve
- Replace if there are loud valve noises that affect the whole cylinder head
- Replace if loosened in fitting
- Secure with suitable thread locking compound
- 25 Nm (18 ft. lbs.)
8 Bolt
- Tighten to: 10 Nm (7 ft. lbs.)
9 Camshaft Position (CMP) sensor housing
10 Cylinder head
- Checking for distortion, refer to Procedure. Testing and Inspection
- Resurfacing dimensions, refer to Resurfacing
11 Cylinder head gasket
- Always replace
- Identification: lettering on gasket must face upward
NOTES:
- The single cylinder head -10- listed in the Parts catalog can be used on either left or right sides and uses a cap to seal at the front.
- Installing cylinder head sealing cap, refer to Cylinder Head Sealing Cap.
REMOVAL (ENGINE INSTALLED)
NOTE: The following procedure refers to the left cylinder head.
- Remove ribbed belt.
- Remove toothed camshaft drive belt
Vibration damper remains installed.
- Disconnect exhaust pipe from exhaust manifold.
- Drain engine coolant at drain plug (arrow) using special tool 3247, and at drain plug in bottom of radiator.
- Remove intake air duct between Mass Air Flow (MAF) sensor and intake manifold.
- Disconnect all spark plug wire connectors.
- Disconnect all harness connectors from fuel injectors.
- Disconnect crankcase vents on left and right cylinder head covers.
- Disconnect fuel supply line -1- and return line -2-
- Unclip cover for intake air silencer.
- Remove both screws under cover.
- Push back and lift intake air silencer upward and disconnect vacuum hose on left side.
- Remove intake air silencer.
- Remove left side cover for fuel injector lines.
- Remove accelerator pedal cable retaining clip.
- Disconnect accelerator pedal cable and move to one side.
- Disconnect vacuum hoses from vacuum pump and intake manifold.
- Disconnect line between EVAP canister purge solenoid valve and throttle valve at throttle body.
- Disconnect Idle Air Control (IAC) valve harness connector.
- Disconnect Throttle Position (TP) sensor harness connector at throttle body.
- Disconnect vacuum hose on cruise control vacuum control actuator.
- Disconnect harness connector for Camshaft Position (CMP) sensor.
- Disconnect vacuum hose from Intake Manifold Tuning (IMT) valve (blue).
- Disconnect harness connectors for Heated Oxygen Sensors (H02S) at engine compartment bulkhead, and move to one side.
- Disconnect vacuum line from EVAP canister purge regulator valve at throttle housing.
- Disconnect hydraulic line (arrow).
- Remove bolts (arrows) and remove intake manifold.
- Seal off openings using clean cloth rags.
- Disconnect coolant hose at rear of cylinder head.
- Remove CO tap tube.
- Disconnect Heated Oxygen Sensor (H02S).
- Remove exhaust manifold heat shield.
- Remove cylinder head cover.
- Remove rear camshaft drive belt guard.
- Disconnect hose between hydraulic fluid reservoir and hydraulic pump.
- Remove cylinder head bolts, and remove cylinder head.
Checking Cylinder Head Distortion
- Measure at several points with precision straight edge.
Max. permissible distortion: 0.05 mm (0.002 inch)
INSTALLATION
- Clean sealing surfaces.
- Install cylinder head gasket.
Lettering on gasket must face toward cylinder head.
- Install cylinder head, and check position on centering pins in cylinder block.
- Install cylinder head bolts hand tight only.
- Using the pattern shown, tighten cylinder head bolts in two stages:
Stage 1: 60 Nm (44 ft. lbs.)
Stage 2: additional 1/2 turn (180°)
NOTES:
^ For final 1/2 turn, two 1/4 turns (90°) are also permissible.
^ It is not necessary to re-tighten the bolts, or to check bolt tightening torque during the next maintenance service.