Disconnect the engine crankcase ventilation hose "2" by pressing the release buttons. Remove the air duct hose by loosening the hose clamp "1" for this purpose.
Unscrew bolts -1 and "3" of the EGR radiator. Ignore "Pos. 2". Remove the toothed belt from the camshaft toothed belt pulley and the high-pressure pump toothed belt pulley. Remove the cylinder head cover.
Unscrew bolts "1" and remove the camshaft timing belt gear.
Unscrew bolt "1" of the camshaft hub, holding it with counter support "T10051". Unscrew the bolt by about 2 turns.
If the hub cannot be removed by hand: place the "T10052" puller on the camshaft hub and screw bolts "1" into the hub. To remove the camshaft hub, screw in bolt "2" and hold it by the hexagon (30) of the puller. Remove the hub from the camshaft cone. Remove the vacuum pump.
Loosen the camshaft frame bolts in the sequence "24...1". Unscrew the bolts and carefully peel off the camshaft frame. Mark for reinstallation and remove the camshafts.
Installation
Risk of damage to the thrust bearing in the support frame. The camshafts must only be installed using the camshaft installation device "T40094" as described below. Risk of contamination of the lubrication system and bearings. Cover open engine parts. Remove sealant residues from the cylinder head and support frame, e.g. with 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: screw the supports "T40094/9" and "T40094/10" (with "T40094/11") onto the main plate, as shown in the figure. If necessary, unscrew the screwed supports at this point.
Install support "T40094/1" to position "F" and support "T40094/2" to position "A".
Place the intake camshaft on supports "T40094/1" and "T40094/2". Turn the intake camshaft so that it can be locked with the lock in the "TDC" position "arrow 1". The concavity "arrow 2" of the cylinder head bolt must be facing outward.
Place the exhaust camshaft on the supports "T40094/9" and "T40094/10". Secure the exhaust camshaft with the cover "T40094/11". Protrusion "1" of the cover must enter groove "2" in the camshaft. Install the clamping tool "T40096/1" on the gear engagement of the exhaust camshaft so that each journal of the clamping device engages on each half of the gear. The wide journal must enter the wide half of the gear. Tighten the clamping device with a knurled wheel until the tooth profiles are flush. Push the intake camshaft toward the exhaust camshaft so that their teeth engage "arrows".
Install the frame onto the camshafts. All camshaft bearings must be on the camshafts. Install the camshaft stand "T40095" and secure the camshafts in the frame as shown in the figure. Remove the cover "T40094/11".
Take into account the expiration date of the sealant. Cut off the tube tip along the front mark (hole diameter approx. 2mm). Risk of contamination of camshaft bearings due to excess sealant. Sealant strips must not be thicker than the specified size. Apply a strip of sealant to the clean cylinder head mounting surfaces as shown in the figure. Sealant strip thickness: 2...3 mm. Install and tighten the camshaft frame without delay, as the sealant begins to harden immediately. After installing the crankshaft frame, allow the sealant to harden for about 30 minutes.
Remove the camshafts together with the frame, the T40095 camshaft stand and the T40096/1 clamping tool from the T40094 camshaft stand and carefully insert them into the cylinder head. Screw in the camshaft frame bolts in the sequence "1...24" evenly by hand and until they stop. The frame must fit against the cylinder head over the entire mating surface. Tighten the bolts. Remove the T40095 camshaft installation tool and the T40096/1 clamping device. Install in the reverse order, while taking into account the following. Install the camshaft lip seal. Press the new cover into the cylinder head using a suitable mandrel to a depth of 1...2 mm. Install the vacuum pump. Install the cylinder head cover.
(This article was copied from an online resource «audimanual.ru»)