Removing valve tappets of cylinder bank 1 - 3

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Move camshafts to basic position. The groove in the camshaft must face outward toward the cylinder head cover.
View from the flywheel side

Fig 1: Identifying Groove In Camshaft - Cylinder Bank 1-3
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Turn engine on assembly support until cylinder bank 1 - 3 faces upwards.
Unscrew chain tensioner of cylinder bank 1 - 3.

Fig 2: Identifying Chain Tensioner Of Cylinder Bank 1 - 3
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Detach and remove oil extraction pump at cylinder head 1 - 3 - on flywheel side.

Fig 3: Removing Oil Extraction Pump At Cylinder Head 1 - 3 - On Flywheel Side
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Unscrew hexagon-head bolts M6 x 20 (2 ea.). Remove closure cap from tensioning element (VarioCam).
Remove cylinder head cover. Loosen hexagon-head bolts from the outside to the inside.
Fasten special tool 9611, holding-down device for camshafts, with auxiliary screws M6 x 45.

Fig 4: Identifying Holding-Down Device For Camshafts
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Relieve camshaft tensioning element with special tool, tensioning screw 9632.

Fig 5: Relieving Camshaft Tensioning Element
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NOTE:
- Screw tensioning screw in only until the chain is slightly relieved.
Unscrew three fastening screws (M6 x 95) for tensioning element.
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.

Fig 6: Locating Four Hexagon-Head Bolts (M6 X 15) On Chain Sprocket
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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.

Fig 7: Connecting Sprocket Wheel And Chain With Tie Wrap
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Detach two bearing saddles. Lever bearing saddles out of the guide sleeves.
Remove holding-down device (special tool 9611) from the camshafts.
Carefully lift the complete unit, camshafts with chain and tensioning element out of the cylinder head. The chain must not jump over.

Fig 8: Identifying Camshafts With Chain And Tensioning Element
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Lift out valve tappets with a magnet.
Detach guide for valve tappet. Undo the pan-head screws (15 ea.) from the outside to the inside, and remove the guide.

Fig 9: Locating Pan-Head Screws
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