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25. Detach guide for valve tappet. Undo the pan-head screws (15 ea.) from the outside to the inside, and remove the guide.
Installing
Installing valve tappets of cylinder bank 1- 3
1. Check guide for damage.
2. Fit guide. Tighten pan-head screws (M6 x 35) from the inside to the outside. Tightening torque:
10 Nm (7.5 ft. lbs.)
3. Lightly oil the valve tappet and fit it in the guide.
4. Lay the complete unit, camshafts with chain and tensioning element, in the cylinder head. The groove or tab of the camshaft position sensor cover
must face outward in installed position. If the allocation should be uncertain, e.g. chain jumped over, reallocation is necessary.
5. Fasten special tool, holding-down device 9611, with auxiliary screws M6 x 45.
6. Check dowel sleeves (4 ea.) of the bearing saddles to ensure that they are properly seated in the cylinder head. Oil bearing surface. Fit bearing
saddles in the correct position and tighten evenly.
Tightening torque:
10 Nm (7.5 ft. lbs.)
7. Fit tensioning element (VarioCam). Tighten 3 M6 x 95 pan-head screws.
Tightening torque:
10 Nm (7.5 ft. lbs.)
This is a source reference. Confirm exact model applicability in the original material.