Removing Valve Tappets of Cylinder Bank 4 - 6

Removing valve tappets of cylinder bank 4 - 6





1. Remove fixing pin. Turn crankshaft clockwise until the bore 1 OT (top dead center) in the belt pulley is aligned with the fixing bore on the crankcase. Position or fix with fixing pin (short) of special tool 9595.





View from the belt pulley side

2. Check camshaft adjustment at cylinder bank 4 - 6: The groove in the camshaft must face inward toward the crankcase.
3. Turn engine by 90° on assembly support until cylinder bank 4 - 6 faces upwards.





4. Unscrew chain tensioner of cylinder bank 4 - 6.
5. Remove closure cap from tensioning element (VarioCam). Hexagon-head bolts M6 x 20 (2 ea.).
6. Remove cylinder head cover. Loosen hexagon-head bolts from the outside to the inside.





7. Fit holding-down device for camshafts, special tool 9611. Use auxiliary screws M6 x 45.





8. Detach and remove oil extraction pump at cylinder head 4 - 6 (pulley side).
9. Relieve camshaft tensioning element with tensioning screw, special tool 9632.

Information
^ Screw tensioning screw in only until the chain is slightly relieved.

10. Unscrew three fastening screws (M6 x 95) for tensioning element.
11. Affix auxiliary chain tensioner (screw in by approx. 3 turns). Undo four hexagon-head bolts (M6 x 15) on the chain sprocket. Remove auxiliary chain tensioner again.





12. Remove drive plate. Connect sprocket wheel and chain with a tie wrap (installation position). With a second tie wrap suspend the sprocket wheel and chain to the side under slight tension.
13. Detach two bearing saddles. Lever bearing saddles out of the guide sleeves.
14. Remove holding-down device (special tool 9611) from the camshafts.





15. Carefully lift the complete unit, camshafts with chain and tensioning element out of the cylinder head. The chain must not jump over. The groove or tab of the camshaft position sensor cover must face downward. If the allocation should be uncertain, e.g. chain jumped over, reallocation is necessary.
16. Lift out valve tappets with a magnet.
17. Detach guide for valve tappet. Undo the pan-head screws (15 ea.) from the outside to the inside, and remove the guide.