Removal and installation the cylinder head (Chevrolet Lumina 1)

Removal

1. Disconnect the cable from the negative terminal of the battery.

2. Disconnect the wires and unscrew the spark plugs (see chapter 1, section 32). To simplify the subsequent installation procedure, mark the wires.

3. Remove all accessories and brackets for their installation. To make installation easier, please label each one.

4. Disconnect all wires and hoses from the cylinder head(s). To make their installation easier, mark each one.

5. Remove the intake manifold (see section 7).

6. Disconnect the exhaust manifold from the cylinder head to be removed (see section 9).

7. Remove the valve covers (see section 4).

8. Remove the valve rocker arms and valve push rods (see section 5).

9. Loosen the cylinder head mounting bolts one at a time by 1/4 turn until they can be removed by hand; in this case, move from one bolt to another in the sequence shown in the illustration (see illustration).



10. Disconnect the cylinder head from the engine. If you feel resistance, do not try to remove the head using a lever inserted between the head and the cylinder block - this may damage their mating surfaces. Check again that all the bolts are loose, then use a wooden block and a hammer to tap the cylinder head and try to pry it off. Be careful as the heads sit on dowel pins. As a last resort, try to detach the head using a lever installed in its rear corner; while doing this, try not to damage anything. After removing the head, place it on wooden blocks to avoid damaging the gasket surface.





11. The procedures for disassembling and checking the condition of the cylinder head are presented in chapter 2, Part 2.3.

Installation

12. Before starting installation, thoroughly clean the mating surfaces of the cylinder head and block.

13. Using a scraper, remove any remaining carbon deposits and old gasket material from the mating surfaces, then wash them with varnish solvent or acetone. If grease remains on the mating surfaces during assembly, the gasket may not provide a sufficient seal, resulting in oil leakage. When working with the cylinder block, cover the recesses of the tappets with a rag to prevent dirt from getting into the engine. Remove any dirt that has entered the cylinders with a cloth or vacuum cleaner.





14. Check the mating surfaces of the block and cylinder head for scoring, deep scratches and other types of damage. If the damage is minor, remove it with a file; in case of severe damage, the only way to eliminate it is to machine the surface.

15. Using a tap of the appropriate diameter, tap the threads in the cylinder head bolt holes. The presence of dirt, traces of sealant and damaged threads will affect the tightening torque value.

16. Position the new gaskets over the dowel pins in the cylinder block. If steel manifold gaskets are used, apply a thin, even coat of sealant, such as K&W Copper Coat, to both sides of the gaskets before placing them on the cylinder heads (or its equivalent). Gaskets "non-retorquing" ("without moment") are installed without sealant, unless the manufacturer specifies otherwise. On some types of gaskets there are inscriptions "TOR" ("Top") and "THIS SIDE UP" ("Upper side"), facilitating the correct installation of the gasket during assembly of the unit (see illustration).





17. Carefully place the head on the cylinder block, being careful not to move the gasket.

₂ or equivalent sealant to the threads and undersides of the bolt heads.

19. Tighten the bolts in the recommended sequence (see illustration), moment specified in the technical conditions given in this chapter. This is done in three stages, each time following the prescribed sequence.



20. The remaining points are performed in reverse order.

21. Replace the oil filter and fill the engine with fresh oil (see chapter 1, section 12).

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