24. Inspect the contact surfaces of the tappets with the cams for worn spots and scratches. Check the tappet walls and the holes for them in the cylinder head for damage and wear. If a tappet is suspected of being faulty or is visibly worn, it should be replaced with a new one.
25. Install the tappets, each in its place, having previously lubricated them with MOLYDAL GB SP 370G oil. Check the ease of movement of the tappets in the cylinder head.
26. Remove any remaining oil from the threads of the camshaft bearing housing mounting bolts.
27. Apply a thin layer of MOLYDAL GB SP 370G oil to the bearing journals and camshaft cams.
28. Install the camshafts into their seats.
29. Ensure that the centering pins are present 12. Apply a layer of E SILICONE CATEGORIE 2 sealant (AUTOJOINT OR) around the perimeter of the bearing housings (see illustration) and install the bearing housings into their seats.
4.29 Make sure that the centering pins are present 12. Apply a layer of E SILICONE CATEGORIE2 sealant (AUTOJOINT OR) around the perimeter of the bearing housings
30. Tighten the bearing housing mounting bolts in several passes in the sequence shown in the illustrations:
- 1st pass - tighten the bolts by hand;
- 2nd pass - tighten the bolts to 2 Nm;
- 3rd pass - tighten the bolts to 8 Nm.
4. 30 Sequence of tightening the camshaft bearing housing bolts. Right cylinder head
4.30a Sequence of tightening the camshaft bearing housing bolts. Left cylinder head
Attention! Cylinder head cover gaskets are composite; minor damage to gaskets can be repaired by applying SILICONE CATEGORIE 2 sealant.
31. Install the cylinder head covers. Tighten their mounting bolts in the sequence shown in the illustrations. Tightening torque:
- 1st pass tighten the bolts by hand;
- 2nd pass - tighten the bolts to 5 Nm;
- 3rd pass - tighten the bolts to 10 Nm.
4.31 Sequence of tightening the bolts for fastening the right cylinder head covers
4.31a Sequence of tightening the bolts for fastening the covers of the left cylinder head
32. Make sure that the seal seats are clean; if necessary, remove any remaining sealant.
33. Lubricate the sealing lips of the new oil seals with clean engine oil. Do not lubricate the outer edge of the seal.
34. Fit new camshaft seals using a suitable mandrel, such as mandrel "a" 0187-D (see illustration).
4.34 Fit new camshaft seals using a suitable mandrel, such as mandrel "a" 0187-D
35. Secure each camshaft hub with bolt 13 (see illustration 4.34).
36. Screw in the upper bolts securing the rear timing cover.
37. Remove the upper right engine mount.
38. Install the camshaft gears together with the hubs 5. Flange C of the intake camshaft gear should face away from the engine, and flange C of the exhaust camshaft gear should face towards the engine (see illustration).
4.38 Install the camshaft gears together with the hubs 5, flange C of the intake camshaft gear should be facing away from the engine, and flange C of the exhaust camshaft gear should be facing the engine
Please note: The camshaft gears are identical and interchangeable.
39. Lock the gears using a special key "a", catalog number 0187-F (see illustrations 4.38 and 2.13a), and tighten the bolts of their fastening either immediately with a force of 80 Nm, or in several passes:
- 1st pass - tighten the bolts to 20 Nm;
- 2nd pass - tighten the bolts by 57°.
40. Install the timing belt of the gas distribution mechanism drive (see the relevant chapter).
41. Further installation of the dismantled components is carried out in the reverse order of removal.