Left cylinder head (Discovery 3)

Removal

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

2. Drain the coolant. For more information, refer to Draining/Filling Coolant and Bleeding the Cooling System (10/26/01)

3. Proceed to the camshaft timing order. For more information, refer to Valve Timing

4. Remove the exhaust manifold. For more information, refer to Left Exhaust Manifold (30.15.10)

5. Release the wiring harness bridge to gain access. Remove the bolt.



6. Move the air conditioning compressor support bracket to the side.

• Remove four bolts.
• Release the clips securing the knock sensor electrical connector.
• Move the bracket to the side and tie it.

7. Remove the left hydraulic timing chain tensioner. Clean the mating surfaces of the parts.





8. Remove the Torx bolt securing the chain guide. Remove and discard the sealing ring.

9. Remove the camshaft sprocket bolt.

• Remove the sprocket from the camshaft.
• Fasten the chain and guide with wire.

10.

CAUTION: Loosen the bolts gradually in a criss-cross pattern.

Remove 10 cylinder head bolts. Discard the bolts.



11. Remove the left-hand cylinder head assembly.

• Release the knock sensor wiring harness clamp.
• Remove the bolt.

12. Remove and discard the cylinder head gasket.

• Clean the cylinder head dowel pins.
• Clean and inspect the cylinder head and cylinder block.

13.

NOTE: Loosen the camshaft bearing caps evenly and gradually.

NOTE: Remember the position in which the part was installed.

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

Remove the camshaft bearing caps.

• Remove eight bolts.
• Remove the camshaft oil supply line.

14. Remove the camshaft.

Installation

1. Install the camshaft.

• Clean the mating surfaces of the parts.
• Lubricate the parts with clean engine oil.

2.

NOTE: Remember the position in which the part was installed.

Install the camshaft bearing caps.

• Clean the mating surfaces of the parts.
• Lubricate the parts with clean engine oil.

3.

NOTE: After installing the bolts, make sure the camshaft rotates freely.

Install the camshaft oil supply line.

• Thoroughly clean and inspect the oil feed line.
• Fill the oil supply line with clean engine oil.
• Tighten the bolts evenly in 2 stages in the sequence shown.
• Tighten the bolts (tightening torque 6 Nm).
• Tighten the bolts (tightening torque 16 Nm).

4. Clean the mating surfaces of the parts.

5. Check the cylinder head surface for deformation in the longitudinal and transverse directions and diagonally. For more information, refer to Specification



6.

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

Install a new cylinder head gasket.

7. Install the left-hand cylinder head assembly.

• Install the knock sensor bracket.
• Tighten the bolt (tightening torque 10 Nm).

8.

NOTE: Tighten bolts 1 through 8 in the sequence shown. M12 bolts are tightened in three stages.

Tighten the cylinder head mounting bolts.

• Lubricate the new cylinder head bolts with clean engine oil.
• Tighten the M12 bolts (tightening torque 30 Nm), and then another 80 degrees.
• Tighten the M12 bolts another 80 degrees.
• Tighten the M8 bolts (tightening torque 35 Nm).

9. Install the exhaust manifold. For more information, refer to Left Exhaust Manifold (30.15.10)



10. Tighten the Torx bolt securing the chain guide.

• Install a new O-ring.
• Tighten the bolt (tightening torque 10 Nm).
• Clean the mating surfaces of the parts.

11. Install the A/C compressor support bracket assembly.

• Clean the mating surfaces of the parts.
• Tighten the bolts (tightening torque 45 Nm).
• Secure the wiring harness.
• Tighten the knock sensor clamp mounting bolt. (tightening torque 10 Nm).

12. Install the left hydraulic timing chain tensioner.

13. Adjust the valve timing. For more information, refer to Valve Timing

14. Install the wiring harness bridge. Tighten the bolt. (tightening torque 45 Nm).
15. Connect the ground cable to the battery. For more information, refer to Specifications

16. Fill the cooling system with coolant and bleed air from the system. For more information, refer to Draining/Filling Coolant and Bleeding the Cooling System (10/26/01)

[The original text was published on the website: lrman.ru]