Pic. 3.63. Cylinder head cover: 1, 19 - plug; 2 - nut; 3 - protective cover; 4 - overlay; 5, 28, 31, 33, 39 - sealing ring; 6, 23 - locating pin; 7 - rubber-metal hinge; 8, 9 - cap nut; 10 - gasket washer; 11 - sealant; 12, 13, 14 - profile gasket; 15, 37 - sealing ring (17x3); 16, 35 - camshaft sensor; 17, 34 - bolt (M6x16); 18 - precision bolt; 20 - plug with a sealing ring; 21 - flange hook; 22 - mount; 24 - nut M6; 25 - jumper «masses»; 26 - bolt (M6x10); 27 - nut M8; 29, 32 - hollow bolt; 30 - oil pipeline; 36 - EMC; 37 - ring (17x3); 38 - piston; 39 - spring; 40 - cylinder head; 41 - metal seal; 42 - executive unit; 43 - oil filler cap; 44 - head cover
Seal replacement (12, 13, 14) engine cylinder head covers must be carried out in the following order. Remove the upper protective soundproof casing (3), shutting down the engine. Remove ignition coils. Unclip wiring harness for ignition coils and move to one side.
Press the latches and disconnect the crankcase ventilation hose from the cover (44). Remove jumpers (pic. 3.64) connections with «weight».
Loosen fastening (15 pcs.) cylinder head covers, unscrew them and remove the cover.
Clean the sealing surfaces of the cylinder head, head cover from the remnants of the old seal. Use a hardwood scraper to clean surfaces (beech, hornbeam, oak).
Before installing the head cover, in places with a crash - between the cylinder head and the final control units of the D-VANOS system on the left and right sides (arrow, fig. 3.65,a); in the places of rounding of the actuating unit (arrows, fig. 3.65,b) and at the rounding points at the rear of the cylinder head (arrows, fig. 3.65,in) Apply a thin, even coat of sealant such as Drei Bond 1209.
Check the condition of the gaskets and replace if necessary. Make sure the gasket is installed correctly (arrows, fig. 3.66) at the rear and front of the cylinder head.
Insert cover bolts and align cover with cylinder head. Screw in all bolts (M6) fastening the cover by hand, but without tightening them completely. Check the alignment of the cover, and tighten the cover fastening bolts in a crosswise order, moving from the middle to the edges.