Left cylinder head (Discovery 3)

Removal

CAUTION: If the cylinder head must be replaced on a vehicle with a variable valve timing (VCT) system, the oil line rivet must be removed before installing the new cylinder head.

1. Disconnect the ground cable from the battery. For more information, refer to Specification

2. Remove the intake manifold. For more information, refer to Intake Manifold Assembly (30.15.02)

3. Remove the left bank camshafts. For more information, refer to Left camshafts (12.13.21)

4. Remove the camshaft position (CMP) sensor.

• Remove the Torx head screw.
• Disconnect the electrical connector.

5. Disconnect the EGR pipe flange from the exhaust manifold. Unscrew the 2 nuts.



6.

CAUTION: Bolts can be reused twice. Mark bolts to be reused by punching one dot in the center of the bolt. If two punched dots are visible on the bolt, discard the bolt.

NOTE: Remove the bolts in the sequence shown.

Remove 12 cylinder head bolts.



7. Remove the left-hand cylinder head assembly. Remove the cylinder head with assistance.

8. Remove the cylinder head gasket and discard it. Clean the cylinder head dowel pins.



9.

NOTE: Do not continue disassembly if the part is being removed only for access.

Remove the exhaust manifold.

• Remove 8 bolts.
• Discard the gasket and bolts.

Installation

1.

CAUTION: If the cylinder head needs to be replaced on a vehicle with a VCT system, the oil line rivet must be removed before installing the new cylinder head.

CAUTION: Remove all foreign particles from the cylinder head and cylinder head oil line.

Vehicles equipped with VCT: Remove the blind rivet from the VCT oil line.

• Identify the VCT oil supply line and 8mm rivet.
• Using a suitable 3mm punch, pry the centre of the rivet pin free from the outer portion of the rivet pin.
• Using a suitable extraction tool, remove the remaining portion of the rivet.

2. Clean the contact surfaces of the parts.

3. Check the cylinder head surface for unevenness in the center and corners.



4. For cylinder head mating surface deformation data, refer to the technical specifications. For more information, refer to the Specification.



5.

NOTE: If the cylinder head has distortion above the maximum tolerance, the cylinder head material should be measured.

The article is based on data from the website: LRman.ru

Measure the cylinder head material.

• Check the measurement from the center of the exhaust system pin to the cylinder head surface as shown in the figure.
• If the measurement is less than 51.88 mm, the cylinder head should be replaced.

6. Install the exhaust manifold.

• Clean the contact surfaces of the parts.
• Install the gasket/heat shield.
• Tighten the heat shield mounting bolt. (tightening torque 25 Nm).
• Tighten the bolts evenly and gradually in the sequence shown. (tightening torque 20 Nm).

7.

CAUTION: The cylinder head gasket must be installed on the cylinder block studs.

Install a new cylinder head gasket.

8. Install the cylinder head with assistance.

9.

NOTE: Tighten bolts 1 through 10 in the sequence shown.

Screw in the cylinder head mounting bolts.

• Lubricate the new cylinder head bolts with clean engine oil.
• Tighten bolts 1 through 10 to 20 Nm.
• Tighten bolts 1 through 10 to 35 Nm.
• Tighten bolts 1 through 10 another 90 degrees.
• Tighten bolts 1 through 10 another 90 degrees.
• Tighten bolts (M8) 11 and 12 (tightening torque 25 Nm).

10. Attach the EGR pipe and exhaust manifold flanges. Tighten the nuts. (tightening torque 25 Nm).

11. Install the CKP sensor.

• Tighten the Torx head screw (tightening torque 7 Nm).
• Connect the electrical connector.

12. Install the left bank camshafts. For more information, refer to Left camshafts (12.13.21)

13. Reinstall the intake manifold. For more information, refer to Intake Manifold Assembly (30.15.02)

14. Connect the ground cable to the battery. For more information, refer to Specification.