Remove the drive pulley of the toothed belt with the puller "T10320". Remove the left cylinder head cover.
Remove the EGR radiator changeover valve "N345" "pos. 1" from the bracket. Unscrew the bolt "4" and the pin with the ball head "2". Release the wiring harness "3" on the rear left coolant pipe. Ignore the "arrows".
Unscrew the union nut "1" of the high-pressure line. Unscrew the bolts "arrows" and remove the fuel rail from the left cylinder head.
Loosen the bolts and nuts of the crankshaft frame in the sequence "18...1". When removing the camshafts, pay attention to the rocker arms and compensators. Carefully remove the crankshaft frame from the camshafts.
Installation
Risk of damage to the thrust bearing in the crankshaft frame. Install the camshafts strictly according to the description using the camshaft installation tool "T40094". Risk of contamination of the lubrication system. Close open parts of the cylinder head. Remove residual sealant from the cylinder head and camshaft frame, for example, using a rotating brush attachment with plastic bristles. Clean the mounting surfaces; there should be no oil or grease on them. Lubricate the working surface of the camshafts with oil. Equip the camshaft installation tool "T40094" as follows: insert the support "T40094/2" into the socket "A", insert the support "T40094/1" into the socket "D".
Install the exhaust camshaft "1" on the support "T40094/1" and "T40094/2". Turn the exhaust camshaft so that it can be locked with the lock in the "TDC" position "arrow". Install the camshaft installation tool "T40096" on the gear engagement of the exhaust camshaft so that each jaw of the clamping device engages on each half of the gear. Tighten the clamping device with a knurled wheel until the tooth profiles are at the same level.
Install the intake camshaft "2" in the camshaft installation tool "T40094". The locking pin "3" must enter the groove of the intake camshaft. Move the exhaust camshaft "1" toward the intake camshaft "arrows" so that the teeth engage.
Make sure that the camshafts are positioned correctly: the "arrow" recesses on both camshafts must be facing outward.
Install the crankshaft frame "1" on both camshafts. All camshaft bearings must be on the camshafts. Install the camshaft installation tool "T40095" on the camshafts by aligning the gripping pliers and securing with the notched nuts "2". Apply tension to the camshafts by tightening the notched nuts "3" upwards.
Make sure there are "arrow" pins in the cylinder head. If there are no centering pins, insert them.
Consider the expiration date of the sealant. Cut off the tube tip along the front mark (diameter hole approx. 1.5 mm). For better presentation, the crankshaft frame is shown without camshafts. Turn the crankshaft frame over. Risk of clogging the lubrication system channels with excess sealant. The sealant beads must not: be thicker than the prescribed size. Apply a bead of sealant "arrows" to the clean mounting surfaces of the camshaft frame, as shown in the figure. The grooves of the mounting surfaces must be filled with sealant. The sealant beads must protrude above the mounting surface by 1.5... 2.0 mm. Install the crankshaft frame within 5 minutes after applying the sealant.
Risk of engine damage. Check that all roller rocker arms are correctly positioned on the ends of the valve stems and the compensators. Fit the crankshaft frame with both camshafts and the camshaft installation tool "T40095" to the cylinder head. Tighten the crankshaft frame bolts. Remove the camshaft installation tool "T40095" and "T40096". After fitting the crankshaft frame, allow the sealant to harden for approx. 30 min. Refit in reverse order. Fit the left cylinder head cover. Replace the camshaft oil seal. Fit the injection pump toothed belt and the upper section of the intake manifold. Fit the camshaft drive chains. Risk of damage to the valves and piston crowns after working on the valve mechanism. Since the hydraulic compensators must be settled, do not start the engine for approx. 30 min. after fitting the camshafts. To ensure that no valve comes into contact with the cylinder head during operation, carefully turn the engine at least 2 revolutions.