2. Unscrew and remove the oil pressure sensor. Remove the oil level dipstick.
3. Disconnect the crankcase ventilation hose from the camshaft cover.
4. Remove the bolts, noting the locations of the hangers, then lift the cylinder head cover and remove the gasket. Remove the mounting bolts, remove the camshaft sprocket access plate and the gasket at the front end of the cylinder head.
5. Rotate the crankshaft until the pointer in the hole on the right side of the cylinder block aligns with the mark on the flywheel/drive plate. In this position, piston No.1 (front) is at TDC. The injection timing mark on the camshaft sprocket should align with the notch in the camshaft sprocket support plate and the recess in the camshaft should be correctly positioned to allow full access to the cylinder head bolts (see illustrations). If this does not work, rotate the crankshaft several full revolutions. Do not rotate the crankshaft/camshaft forward from this position.
6. Loosen the plastic side play bolt at the end of the camshaft, then loosen and remove the camshaft sprocket mounting bolts. Remove the sprocket from the camshaft. Check that the camshaft sprocket and drive chain remain properly engaged, secure them together with wire. Make alignment marks between the sprocket and chain.
7. Remove the two small bolts securing the drive chain cover to the front of the head.
8. Working in the reverse order of Illustration 12.19, loosen the cylinder head bolts uniformly one half turn at a time until all the bolts can be loosened and removed by hand. Discard the bolts; new ones must be used during installation.
9. Lift the cylinder head. Remove the gasket and remove the O-ring from the top of the timing chain cover. Also remove the head location pins.
10. Remove the mounting bolt and washer and remove the pulley assembly from the crankshaft. To prevent rotation while loosening the bolt, lock the flywheel/drive plate with a homemade tool similar to the one shown in the illustration.
11. Carefully inspect the flywheel/drive plate mounting bolts; locate the bolt that is marked "P" and mark its position on the flywheel/drive plate (see illustration). Remove the mounting bolts and flywheel/drive plate. On automatic transmission models, remove the washer and spacer behind the drive plate. Discard the bolts; new ones must be used during installation.
12. Remove the bolts, water pump and gasket from the drive chain cover.
13. Unscrew the drive chain tensioner mechanism and remove the sealing gasket.
14. Turn the engine over on the workbench.
15. Loosen and remove the mounting bolts, remove the pan and gasket. Note that the bolts are different lengths. Unscrew the inlet pipe from the base of the oil pump, remove the gasket.
16. Unscrew the drive chain cover mounting bolts, bolts of different lengths. Remove the cover with both gaskets. Remove the location pins.
17. Make alignment marks between the crankshaft sprocket and the drive chain, then disconnect the drive chain and remove it together with the camshaft sprocket.
18. Remove the mounting bracket and take out the drive chain tensioner blades.
19. Unscrew the mounting bolt, remove the drive chain guide from the front side of the block. If necessary, unscrew the camshaft sprocket support plate.
20. Mark the position of the caps and connecting rods relative to each other.
21. Lay the cylinder block on its side, then remove the connecting rod lower head bolts of cylinder No.1 and remove the cover. Using a hammer handle, tap the connecting rod and piston through the top of the block. Install the cover on the connecting rod, keeping the bearing shells in their main positions.
22. Repeat the procedure with the remaining pistons and connecting rods.
Material copied from this resource (OpelBook.ru)
23. The main bearing caps also need to be noted.
24. Turn the block over again, then remove the main bearing bolts and caps. Be careful to keep the bearing shells in their respective caps.
25. Lift the crankshaft out of the crankcase, remove the oil seal. If necessary, remove the oil pump/distributor drive sprockets and the drive chain, noting the installation orientation. Remove the woodruff key from the crankshaft groove.
26. Remove the upper halves of the main bearing shells from the crankcase and place them with their corresponding caps.
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