Overhaul

Cylinder Head














Disassembly
1. Remove the bolts and the variable camshaft timing (VCT) housing.
^ Discard the gasket.
2. Lubricate the camshaft and camshaft journals with clean engine oil and install the camshaft.

3. NOTE: The camshaft must be installed in the head to use the special tool necessary to compress the valve springs.

NOTE: Lubricate the camshaft bearing caps with clean engine oil.

Install the camshaft bearing caps in their original locations.
^ Position the front camshaft bearing cap.
^ Position the remaining camshaft bearing caps.
^ Install the bolts finger-tight.
4. Using the special tool, compress the valve spring and remove the valve spring retainer keys.





5. Remove the valve spring retainer, the valve spring and the valve seal.
^ Discard the valve seal.
6. Remove the valve from the cylinder head.
7. Repeat the previous 3 steps for each valve.
8. Inspect the components.

9. CAUTION: Remove the front thrust camshaft bearing cap straight upward from the bearing towers or the bearing cap may be damaged from side loading.

Remove the 2 bolts and the cylinder head camshaft front bearing cap.





10. CAUTION: The camshaft bearing caps must be installed in their original locations. Record camshaft bearing cap locations. Failure to follow these instructions may result in engine damage.

Remove the remaining bolts in the sequence shown and remove the cylinder head camshaft bearing caps.





11. Remove the camshaft.
12. Check the cylinder head for distortion.

Assembly
1. Lubricate the camshaft and camshaft journals with clean engine oil and install the camshaft.

2. NOTE: Lubricate the camshaft bearing caps with clean engine oil.

Install the camshaft bearing caps in their original locations.
^ Position the front camshaft bearing cap.
^ Position the remaining camshaft bearing caps.
^ Install the bolts finger-tight.

3. NOTE: Lubricate the valve stem with clean engine oil prior to installation.

Install the valve into the cylinder head.

4. NOTE: Lubricate the valve seal and valve stem with clean engine oil prior to installation.

Position a new valve seal onto the valve stem.
5. Using the special tool, install the new valve seal.





6. Using the special tool, install the valve spring, the valve spring retainer and the valve spring retainer keys.





7. Repeat the previous 2 steps for each valve.

8. CAUTION: Remove the front thrust camshaft bearing cap straight upward from the bearing towers or the bearing cap may be damaged from side loading.

Remove the 2 bolts and the cylinder head camshaft front bearing cap.





9. CAUTION: The camshaft bearing caps must be installed in their original locations. Record camshaft bearing cap locations. Failure to follow these instructions may result in engine damage.

Remove the remaining bolts in the sequence shown and remove the cylinder head camshaft bearing caps.





10. Remove the camshaft.
11. Install a new gasket, the VCT housing and the bolts.
^ Tighten to 10 Nm (89 lb-in).