2. Remove the intake and exhaust manifolds as described in Section 3.
3. Remove spark plugs, distributor cap, and distributor runner as described in Section 4.
4. Unfasten and remove the top covering of a gear belt of a drive.
5. Remove the thermo-viscous cooling fan and drive belt as described in Section 2.
6. Unscrew the camshaft cover, remove the gasket. Note the location of the high voltage wire hanger.
7. Turn the engine with a wrench on the crankshaft pulley bolt until the mark on the camshaft sprocket aligns with the pointer on the top of the back cover of the timing belt. Also align the notch in the crankshaft pulley with the pointer on the underside of the timing belt rear cover.
8. Loosen the three bolts securing the water pump to the block. Turn the water pump housing counterclockwise and remove the timing belt from the camshaft sprocket.
9. Fix the camshaft with a wrench, then unscrew the clamping bolt and remove the sprocket.
10. Turn off a back covering of a gear belt of a drive from a head of the block of cylinders.
11. Loosen the brackets, disconnect the crankcase ventilation hose from the camshaft housing.
12. In a spiral from outside to inside, loosen each cylinder head bolt a quarter of a turn. Then, in the same sequence, loosen the bolts half a turn, then remove them completely. Note that the cylinder head bolts must be replaced; prepare a new set of bolts for assembly.
13. Raise the camshaft housing and camshaft.
14. Lift the cylinder head off the block.
15. Remove the gasket from the block, clean the mating surfaces.
16. Check that pistons #1 and #4 are still at top dead center.
17. Check that both location pins are inserted into the block. Position the new head gasket on the block labeled «TOR» up and forward.
18. Place the cylinder head on the block so that the pins fit into their holes. Check that the valve lifters, thrust shoes and rocker arms are correctly positioned.
19. Apply compound to the mating surfaces on top of the cylinder head with a soft brush to ensure an even finish.
20. Lower the camshaft housing onto the head.
21. Insert new bolts of fastening of a head of the block of cylinders, tighten them in the sequence shown on Fig.1.3 the moment of an inhaling regulated by the Specification. Note that the bolts must be tightened to the initial torque, then progressively tightened to the specified angle.
22. Install the crankcase ventilation hose, clamp the brackets.
23. Insert and tighten the drive belt back cover bolts.
24. Install the camshaft sprocket, tighten the bolt.
25. Check that the alignment marks on the crankshaft pulley and camshaft sprocket are properly aligned. Install the timing belt while keeping the sprockets in place and apply some tension by moving the water pump clockwise.
26. Ideally a tensioning tool recommended by GM should be used (KM-510-A). If not, continue as follows.
27. Turn the water pump clockwise to create a moderate tension on the belt, then tighten the bolts. Rotate the crankshaft half a turn clockwise by pulling on the belt between the crankshaft and camshaft sprockets. Install a tension sensor between the camshaft and water pump sprockets and check if the readings match the data in the Specifications.
28. If adjustment is needed, move water pump clockwise to increase tension or counterclockwise to decrease tension. Rotate the crankshaft one full revolution and repeat the test.
29. If no tool is available, check the tension by turning the belt 90°with thumb and forefinger.
30. After adjustment, tighten the water pump bolts with the tightening torque specified in the Specification (Section 2) and recheck the alignment of the alignment marks.
31. Install the camshaft cover with a new gasket, then install the mounting bolts and washers, tighten them securely.
32. Install the thermo-viscous cooling fan and drive belt per Section 2.
33. Establish the top cover of a gear belt of a drive.
34. Install spark plugs, distributor cap, and distributor runner per Section 4.
35. Install intake and exhaust manifolds per Section 3.
36. Connect the negative battery cable.
37. Start the engine, warm it up to normal operating temperature.
38. Stop the engine, tighten the cylinder head bolts to the specified angle in the sequence shown in Fig.1.3. There is no need to re-tighten the bolts.
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