Unscrew union nuts "1" and "2". Unscrew the "arrow" bolts and put aside the fuel rail with the connected fuel hoses.
Release the "arrow" wire harness using a lever "80 - 200". "Pos. 1,2" do not take into account.
Loosen the bolts and nuts of the crankshaft frame in the sequence "17...1". When removing the camshafts, pay attention to the rocker arms and compensators.
Carefully remove the crankshaft frame from the camshafts.
Installation
Replace the front cover of the right cylinder head. 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 the open parts of the cylinder head. Remove the remains of the sealant from the cylinder head and the 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 "B", insert the support "T40094/1" into the socket "C".
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 intake camshaft "2" in the camshaft installation tool "T40094". The locking bridge "3" must enter the groove of the intake camshaft. Install the camshaft tool "T40096" on the teeth of the intake camshaft so that each elbow of the clamping device enters the corresponding half of the toothed gear. Tighten the clamping device with a knurled wheel until the tooth profiles are flush. Slide 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 at the front mark (hole diameter approx. 1.5mm). For better presentation, the crankshaft frame is shown without camshafts. Turn the crankshaft frame over. Risk of clogging the lubrication system channels due to excess sealant. The sealant beads must not be thicker than the specified size. Apply a bead of sealant "arrows" to the clean seating surfaces of the camshaft frame, as shown in the figure. The grooves of the seating surfaces must be filled with sealant. The sealant beads must protrude above the seating 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 installed on the ends of the valve stems and the compensators. Install the crankshaft frame with both camshafts and the camshaft installation tool "T40095" on the cylinder head. Tighten the crankshaft frame bolts. Remove the camshaft installation tool "T40095" and "T40096". After installing the crankshaft frame, allow the sealant to harden for about 30 minutes. Install in reverse order. Install the right cylinder head cover. Press in the new threaded plug with a suitable mandrel until it is flush. Install the camshaft drive chains. Risk of damage to the valves and piston crowns after working on the valve mechanism. Since the hydraulic lifters must be settled, do not start the engine for about 30 minutes after installing the camshafts.
To ensure that no valve comes into contact with the cylinder head during operation, carefully turn the engine at least 2 revolutions.