Camshaft and Valve Lifters

REMOVAL & INSTALLATION

2.5L Engine

1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
2. Relieve the fuel system pressure.
3. Drain the engine oil.
4. Remove or disconnect the following:
   • Negative battery cable
   • Intake manifold
   • Accessory drive belt
   • Power steering pump
   • Intake Manifold Runner Control (IMRC) actuator
   • Spark plug wires
   • Ignition coil
   • Exhaust front pipe
   • Oil pan
   • Alternator and bracket
   • A/C compressor
   • Water pump belt and drive pulley
   • Camshaft oil seal housing
   • Wiring harness connector bracket
   • Valve covers
   • Front cover
   • Timing chains

   NOTE: Keep all valvetrain components in order for assembly

   NOTE: Remove the camshaft thrust bearing caps before loosening any of the other bearing cap bolts.

   • Camshaft thrust bearing caps. Loosen the bolts evenly in several passes.
   • Remaining camshaft bearing caps. Loosen the bolts evenly in several passes.
   • Camshafts
   • Rocker arms
   • Hydraulic lifters

     Fig. 1: Right bank camshaft thrust cap loosening sequence — 2.5L engine

     Fig. 2: Left bank camshaft thrust cap loosening sequence — 2.5L engine

     Fig. 3: Right bank camshaft bearing cap loosening sequence — 2.5L engine

     Fig. 4: Left bank camshaft bearing cap loosening sequence — 2.5L engine

   To install:

   WARNING
   The crankshaft keyway must be at the 11 o'clock position before reassembly. Failure to do so may lead to engine damage.

5. Rotate the crankshaft so that the keyway is at the 11 o'clock position for installation of the camshafts.
6. Install or connect the following:
   • Hydraulic lifters
   • Rocker arms.
   • Camshafts. Align the sprocket timing marks.

   NOTE: Do not install the camshaft journal thrust caps until the rocker arms and timing chains have been installed and the camshaft journal caps are secured into position.

7. All camshaft journal caps except the thrust caps.
8. Timing chains. Tighten the camshaft journal cap bolts in reverse of the loosening order and in several steps to 71–106 inch lbs. (8–12 Nm).
9. Thrust caps. Tighten the bolts to 71–106 inch lbs. (8–12 Nm).
10. Front cover
11. Valve covers
12. Wiring harness connector bracket
13. Camshaft oil seal housing
14. Water pump belt and drive pulley
15. A/C compressor
16. Alternator and bracket
17. Oil pan
18. Exhaust front pipe
19. Ignition coil
20. Spark plug wires
21. IMRC actuator
22. Power steering pump
23. Accessory drive belt
24. Intake manifold
25. Negative battery cable
26. Fill the crankcase to the correct level.
27. Fill the cooling system.
28. Start the engine and check for leaks.

3.0L Engine

VALVE LIFTERS

NOTE: Keep all valvetrain components in order for assembly.

1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
2. Remove the rocker arms from the vehicle.
3. Remove the hydraulic lash adjusters from the rocker arms.

   To install:

4. Inspect the hydraulic lash adjuster O-rings and replace if damaged.
5. Fill the rocker arm oil reservoir with clean engine oil.
6. Install the hydraulic lash adjusters to the rocker arms in their original positions.
7. Install the rocker arms to the vehicle.

   Fig. 5: Hydraulic lash adjuster--3.0L engine

CAMSHAFTS

1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
2. Remove or disconnect the following:
   • Negative battery cable
   • Accessory drive belts
   • Front cover
   • Timing belt. Refer to the Timing Belt unit repair section.
   • Distributor
   • Distributor spacer
   • Valve covers
   • Rocker arms and shafts
   • Camshaft sprockets
   • Camshaft seal plates and seals
   • Camshaft thrust plates
   • Camshafts

   To install:

3. Install or connect the following:
   • Camshafts
   • Camshaft thrust plates. Tighten the bolts to 70–95 inch lbs. (8–11 Nm).
   • Camshaft seal plates and seals. Tighten the bolts to 70–95 inch lbs. (8–11 Nm).
   • Camshaft sprockets. Tighten the bolts to 52–59 ft. lbs. (71–80 Nm).
   • Rocker arms and shafts
   • Valve covers
   • Distributor spacer
   • Distributor
   • Timing belt
   • Front cover
   • Accessory drive belts
   • Negative battery cable
4. Start the engine and check for leaks.

   Fig. 6: Exploded view of cylinder head components — 3.0L engine