Overhaul
Cylinder Head
Disassembly
1. Remove the spark plugs.
2. NOTE: Mark each hydraulic lash adjuster to make sure it is installed in its original position.
Remove the hydraulic lash adjusters.
3. NOTE: Keep the valves, valve springs, retainers and retainer keys in order so they can be installed in their original positions.
Using the Valve Spring Compressor, remove the valve spring retainer keys, the valve spring and the retainer. Remove the valve.
- Repeat the procedure until all of the valves are removed.
4. Remove and discard the valve seals.
5. NOTE: Mark the position of the camshaft bearing caps so they can be installed in their original positions.
Remove the 8 bolts in the sequence shown and remove the camshaft bearing caps.
6. Remove the camshaft.
Assembly
NOTE: Lubricate all parts with clean engine oil prior to assembly.
NOTE: Install the camshaft roller followers only after the cylinder head is installed in the vehicle and the timing procedure has been carried out.
1. Inspect the cylinder head. For additional information, refer to Engine.
2. Position the camshaft.
3. NOTE: The camshaft bearing caps must be installed in their original positions.
NOTE: After installing the bolts, check the camshaft for free rotation.
Position the camshaft bearing caps and the 8 bolts. Tighten the bolts in the sequence shown in 2 stages.
- Stage 1: Tighten to 6 Nm (53 lb-in).
- Stage 2: Tighten to 16 Nm (142 lb-in).
4. NOTE: Valves must be installed in the position from which they were removed.
Install the valves.
5. Using the Valve Stem Oil Seal Installer, install new valve stem seals.
6. NOTE: The valve springs, retainers and retainer keys must be installed in the positions from which they were removed.
Using the Valve Spring Compressor, install the valve spring, the retainer and the retainer keys.
7. NOTE: Install the hydraulic lash adjusters in the same positions from which they were removed.
Install the hydraulic lash adjusters.
8. Install the spark plugs.
- Tighten to 15 Nm (133 lb-in).