Installing

Installing valve tappets of cylinder bank 4 - 6

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 inward 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.)





8. Unscrew tensioning screw, special tool 9632, from the tensioning element.
9. Remove be wrap and fit sprocket wheel with chain on the flange of the exhaust camshaft.
10. Position drive plate or driver star of the oil extraction pump on the sprocket wheel. Fit hexagon-head bolt M6 x 15 (10.9). Tighten hexagon-head bolt by hand only.
11. Fit auxiliary chain tensioner on cylinder head 4 - 6.





12. Fit auxiliary chain tensioner without sealing ring and fasten on the crankcase only hand-tight. The mechanical auxiliary chain tensioners must be installed with the correct pretension when the valve timing is adjusted or checked. The necessary pretension force has been achieved when the measuring pin is flush with the face surface of the pressure screw. Turn the screw if necessary.