Audi Workshop Service and Repair Manuals

Removing and installing cylinder head

Special tools and workshop equipment required

t	Support bracket -10 - 222 A-

t	Hook -10 - 222 A /10-

t	Adapters -10 - 222 A /19-

t	Spark plug socket and extension -3122 B-

t	Counterhold tool -3415-

t	Dial gauge -VAS 6079-

t	Retainer -T10014-

t	Puller -T10094 A-

t	Adapter for dial gauge -T10170-

t	Camshaft clamp -T10171 A-

t	Counterhold tool -T10172-

t	Locking pin -T10340-

t  Hose clip pliers -VAS 6362-

t  Assembly tool -T10118-

t  Locking pin -T40011- Removing –  Reduce fuel pressure in high-pressure section of injection system → Rep. gr.24. –  Remove catalytic converter with centre silencer → Chapter. –  Remove thermostat housing with coolant pipe (rear) → Chapter. –  Remove bracket for air conditioner compressor → Rep. gr.87.

–  Disconnect fuel supply line -2- (pull release ring).   Note Disregard -item 1-.

–  Unplug electrical connector -2-. –  Detach vacuum hoses -1-.

–  Unplug electrical connector -4-. –  Remove bolts -1 and 3-. –  Press release tabs and disconnect crankcase breather hoses -arrows-. –  Release hose clip -2- and disconnect hose at activated charcoal filter. –  Detach hoses.

–  Remove bolts -arrows- and ball stud -1-.

–  Unscrew bolts -arrows- and detach bracket -1-.

–  Pull out oil dipstick -1- and sleeve -2-.

–  Remove bolts -arrows- and detach oil return line -1- for turbocharger.

–  Apply puller -T10094 A- to all ignition coils, pull out ignition coils and at the same time unplug electrical connectors at ignition coils for cylinders 1 ... 4. –  Remove spark plug for cylinder 1 with spark plug socket and extension -3122 B-.

–  Unplug electrical connectors -1, 2, 4-, detach wiring duct -3- from camshaft housing and swivel to left side. –  Remove bolt -arrow- for earth wire.

WARNING The fuel system operates at extremely high pressure. This can cause injury. The fuel pressure in the high-pressure section of the injection system must be reduced to a residual pressure prior to opening the system. –  Remove union nuts -arrows- and bolt -1- and detach high-pressure pipe. –  Unplug electrical connector -2- on fuel pressure regulating valve -N276-.

–  Move wiring guide -1- clear -arrows-. –  Unplug electrical connectors at injectors and move clear.

–  Using assembly tool -T10118-, unplug electrical connector -arrow- at oil pressure switch -F1-.

–  Screw adapter for dial gauge -T10170- into spark plug hole as far as the stop. –  Insert dial gauge -VAS 6079- with extension -T10170/1- as far as the stop and secure using locking nut -arrow-. –  Rotate crankshaft in normal direction of rotation to „TDC“. l  „TDC“ = maximum measured value on dial gauge.

–  Remove bolts -arrows- and detach sealing caps -1- and -2-.

l  The threaded holes -arrows- in the camshafts must be positioned as shown in illustration. Turn crankshaft one turn (360°) if necessary.

–  Insert camshaft clamp -T10171 A- into holes in camshafts as far as stop. l  The locking pins -arrows 1- must engage in the holes -arrows 2-. l  The inscription „TOP“-arrow 3- should be legible from above.

–  To secure the camshaft clamp -T10171 A-, screw in an M6 bolt -arrow- hand-tight, but do not tighten.   Caution Avoid damage to camshafts. The camshaft clamp -T10171 A- must not be used as a counterhold tool.

–  Unscrew plug -arrow- for „TDC“ hole on cylinder block.

–  Screw locking pin -T10340- into cylinder block as far as stop and tighten to 30 Nm.   Note The locking pin -T10340- locks the crankshaft only in the direction of engine rotation.

Caution Risk of damage to engine. To prevent the crankshaft chain sprocket from slipping off the drive lug, do not rotate the crankshaft after the poly V-belt pulley has been detached. –  Loosen bolt for poly V-belt pulley using counterhold tool -3415- with pin -3415/1-. –  Remove bolt and take off poly V-belt pulley.

–  Set up support bracket -10 - 222 A- on top edges of body flanges (left and right) and longitudinal member (right-side), as shown in illustration. –  Attach hook -10 - 222 A /10- in right engine lifting eye and tighten spindle slightly to take up weight of engine/gearbox assembly.   Note Spindle -10 - 222 A /11- is not used at this stage. –  Remove timing chain cover → Chapter.

–  Insert bearing bush -2- and screw in crankshaft pulley bolt -1- hand-tight to secure chain sprocket on crankshaft.

–  Press tensioning rail -2- in direction of -arrow- and use locking pin -T40011- to lock piston for chain tensioner -1-.   Caution If a used timing chain rotates in the opposite direction when it is refitted, this can cause breakage. Mark running direction of timing chain with coloured arrows for re-installation. Do not mark timing chain by means of centre punch, notch or the like. Avoid damage to camshafts. The camshaft clamp -T10171 A- must not be used as a counterhold tool. Risk of damage to thread. The camshaft adjuster central bolt has a left-hand thread.

–  Loosen bolt -2- for camshaft adjuster -1- and bolt -4- for camshaft chain sprocket -5-, using counterhold tool -T10172- to counterhold on camshaft chain sprocket. –  Detach camshaft chain sprocket together with camshaft timing chain -3-.   Note Leave camshaft adjuster on camshaft.

–  Loosen locking nut -arrow- and detach adapter for dial gauge -T10170- with dial gauge -VAS 6079-.

–  Pull tensioning rail -1- and guide rail -2- off mounting pins.

–  Slacken camshaft housing bolts in the sequence -15 ... 1-.   Note Bolt -6- below turbocharger remains in camshaft housing. –  Carefully detach camshaft housing towards rear. –  Mark original positions of roller rocker fingers and compensation elements for reinstallation. –  Remove roller rocker fingers together with compensation elements and put down on a clean surface.

–  Secure retainer -T10014- in threaded hole in cylinder block as shown in illustration and tighten to 40 Nm.

–  Attach spindle -10 - 222 A /11- of support bracket to retainer -T10014- with hook -10 - 222 A /2- and partly take up weight with spindle.

–  Detach hook -10 - 222 A /10- and move clear to one side.

–  Slacken cylinder head bolts in the sequence -1 ... 10-. –  Remove bolts and carefully take off cylinder head. –  Place cylinder head onto soft surface (foam plastic). Installing Tightening torques l  → Chapter „Cylinder head - exploded view“. l  → Fig. „„Cylinder head - tightening torque and sequence““. l  → Fig. „„Camshaft housing - tightening torque and sequence““. l  → Chapter „Turbocharger - exploded view“.   Caution Avoid damage to sealing surfaces. t  Carefully remove sealant residue from cylinder head and cylinder block. t  Ensure that no long scores or scratches are made on the surfaces. Avoid damage to cylinder block. No oil or coolant must be allowed to remain in the blind holes for the cylinder head bolts in the cylinder block. Risk of leaks at cylinder head gasket. t  Carefully remove any remaining emery and abrasive material. t  Do not remove new cylinder head gasket from packaging until it is ready to be fitted. t  Handle the cylinder head gasket very carefully to prevent damage to the silicone coating or the indented area of the gasket. Avoid damage to open valves. When installing an exchange cylinder head, the plastic protectors fitted to protect the open valves should not be removed until the cylinder head is ready to be fitted.   Note t  Renew the bolts tightened with specified tightening angle. t  Renew self-locking nuts as well as seals, gaskets and O-rings. t  Renew oil strainer in cylinder head. t  When installing an exchange cylinder head, the contact surfaces between the hydraulic compensation elements, roller rocker fingers and cams must be oiled before installing the cylinder head cover. t  Secure all hose connections with the correct type of hose clips (same as original equipment) → Electronic parts catalogue. t  After fitting a new cylinder head or cylinder head gasket, change the engine oil and the coolant in the entire cooling system.   Caution Protect lubrication system and bearings against contamination. Cover exposed parts of the engine. –  Remove sealant residue on cylinder head and camshaft housing. –  Clean surfaces; they must be free of oil and grease. –  Check that crankshaft is still positioned at „TDC“ and then turn back in the opposite direction of engine rotation by approx. 45°. –  Place cylinder head gasket in position. l  Installation position: Part No. must be visible. l  Note position of dowel sleeves in cylinder block. –  Fit cylinder head.

–  Tighten cylinder head bolts → Fig..   Note Cylinder head bolts do not have to be torqued down again later after repair work.

l  Camshaft clamp -T10171 A- must be fitted and secured with a bolt -arrow- before installing camshaft housing.

–  Ensure all roller rocker fingers contact the valve ends -1- correctly and are clipped into their respective support elements -2-.

Caution Make sure lubrication system is not clogged by excess sealant. The sealant bead must not be thicker than specified. –  Apply a thin and even layer of sealant to the clean sealing surface of the camshaft housing at grey-shaded areas -1 ... 5- shown in illustration.   Note The camshaft housing must be installed within 5 minutes after applying the sealant.

–  Fit new oil strainer -1- into cylinder head. –  Fit 4 seals -2- into cylinder head.

Caution Make sure remnants of oil are removed before fitting, otherwise leakage can occur. Make sure sealing surfaces are free of oil when fitting camshaft housing. –  Carefully fit the camshaft housing vertically onto the dowel pins -arrows- on cylinder head from above.   Note Make sure that camshaft housing is kept straight.

–  Tighten camshaft housing bolts → Fig..   Note After fitting camshaft housing, allow sealant to dry for approx. 30 minutes.

–  Fit tensioning rail -1- and guide rail -2- onto mounting pins. –  Install camshaft timing chain → Anchor. Installation is carried out in the reverse order; note the following: –  Install high-pressure pipe → Rep. gr.24. –  Electrical connections and routing → Current flow diagrams, Electrical fault finding and Fitting locations. –  Install bracket for air conditioner compressor → Rep. gr.87. –  Install thermostat housing with coolant pipe (rear) → Chapter. –  Install catalytic converter with centre silencer → Chapter.   Caution Avoid damage to valves and piston crowns after working on valve gear. Turn the engine carefully at least 2 rotations by hand to ensure that none of the valves make contact when the starter is operated.