Special Tools

1. Apply sealant GM P/N 12378521 (Canadian P/N 88901148) or equivalent to the threads.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

2. Install the (end) oil gallery plugs.

Tighten
Tighten the oil gallery plugs to 38 N·m (28 lb ft).




3. Apply sealant GM P/N 12378521 (Canadian P/N 88901148) or equivalent to the plugs.
4. Install the inner oil gallery plugs.



5. Apply sealant GM P/N 12378521 (Canadian P/N 88901148) or equivalent to the plug.
6. Install the water jacket plug.



7. Use J 38820 to install the valve seals. There is only one size valve seal.




Important: Lubricate the valve stems with clean engine oil before installing.

8. Install the valves. 0.075 mm (0.003 in) oversized valves are available if the valve guides needed to be reamed. Use the same, original size valve seal.



9. Install the valve spring and the valve spring retainer.



10. Use J 8062 and EN 46119 to compress the valve spring.



11. Install the valve keys.
12. Remove J 8062 and EN 46119 .




Important: Do not try to centralize the electrode on the spark plug. The electrode is offset by design.

13. Install the spark plugs.