Cylinder Head: Installing

WARNING: This page is about a different car, the 2010 Audi Q7, 2009 Audi Q7, 2008 Audi Q7, and 2007 Audi Q7. However, it is still accessible from the selected car via links, so may be relevant.

Tightening specifications. Refer to CYLINDER HEAD OVERVIEW , Figure, CAMSHAFT TIMING CHAIN OVERVIEW .

CAUTION:

The sealing surfaces could be damaged.

Carefully remove sealant residue from cylinder head and cylinder block.
Make sure that no long scrapes or scratches result.

Risk of damaging cylinder block.

No oil or coolant must be in the cylinder head bolt blind holes in the cylinder block.

Risk of leaks in cylinder head seal.

Carefully remove all grinding and sanding residue.
Only unpack new cylinder head gasket immediately prior to installation.
To prevent cylinder head seal silicone layer and recessed area from being damaged, always handle seal extremely carefully.

Risk of damaging open valves.

If a replacement cylinder head is installed, only remove plastic base right before cylinder head is installed to protect open valves.

Risk of damaging valves and piston heads after working on valvetrain.

To ensure valves do not strike pistons when starting, carefully rotate engine at least 2 full revolutions.

NOTE:

Replace bolts which have been tightened to torque.

Replace self-locking nuts as well as sealing rings and seals.

If a replacement cylinder head is installed, the contact surfaces between the hydraulic adjusting elements, roller rocker levers and cam running surfaces must be lubricated before installing the cylinder head cover.

Secure all hose connections with hose clamps appropriate for the model.

During installation, all cable ties must be installed at the same location.

The engine oil and coolant must be changed if the cylinder head or cylinder head seal are replaced.

-- Check whether camshafts of both cylinder heads stand in Top Dead Center (TDC) position.

Fig 1: Mounting Camshaft Locating Tool T40070 To Both Cylinder Heads

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T40070 must be installed on both cylinder heads and tightened to 25 Nm.

3242 must be screwed in.

Fig 2: Identifying Crankshaft Holder 3242 Into Hole, Removal/Installation
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-- Position cylinder head gasket.

Pay close attention to alignment bushings in cylinder block -arrows-.

Fig 3: Identifying Alignment Bushings In Cylinder Block
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Pay attention to installation position of cylinder head gasket, marking "oben" (top) or part number must face toward cylinder head.

-- Install cylinder head.

-- Tighten cylinder head bolts. Refer to Figure.

Fig 4: Cylinder Head Bolts Tightening Sequence

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NOTE:

Bolts must not be tightened after repairs.

-- Tighten locking bolt -arrow-.

Fig 5: Identifying Locking Bolt

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-- Check whether camshaft timing chain tensioner guide rail is secured with Locking PinT40071.

Fig 6: Pressing Left/Right Camshaft Timing Chain Guide Rail Inward And Securing Chain Tensioner With Locking Pin T40071

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NOTE:

If the tensioning element is to be removed from the chain tensioner, observe the installed position: Hole in housing floor faces toward chain tensioner, piston faces toward tensioning rail.

Disregard -arrow-.

-- Clean chain tensioner oil screen -2- if necessary.

Fig 7: Identifying Chain Tensioner Oil Screen, Gasket & Chain Tensioner

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-- Place a new gasket -3- onto the rear of the chain tensioner -1-.

-- Set the chain tensioner in place and install the camshaft timing chain, as shown in the illustration.

-- Tighten bolts -1 and 2-.

Fig 8: Identifying Bolts For Left Chain Tensioner And Left Camshaft Timing Chain

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The rest of the installation is in reverse order of removal, note the following:

-- Install camshaft timing chains Installing .

-- Install left and right timing chain covers Installing .

-- Install rear coolant pipe. Refer to REAR COOLANT PIPE .

-- Install left coolant pipe. Refer to LEFT COOLANT PIPE .

-- Install right coolant pipe. Refer to RIGHT COOLANT PIPE .

-- Install cylinder head cover. Refer to LEFT CYLINDER HEAD COVER , RIGHT CYLINDER HEAD COVER .

-- Install intake manifold. Refer to INTAKE MANIFOLD, REMOVING AND INSTALLING .

-- To tighten SW 14 union nut at fuel rail, use V.A.G 1331 with V.A.G 1331/8 .

Fig 9: Fastening High-Pressure Line At Fuel Rail Using Torque Wrench V.A.G 1331 With Open End Wrench Socket V.A.G 1331/8

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-- To tighten SW 17 union nut at fuel rail, use the V.A.G 1331 with V.A.G 1331/6. .

Fig 10: Identifying SW 17 Union Nut At Fuel Rail, Torque Wrench V.A.G 1331 And SW 17 Socket V.A.G 1331/6

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-- Install left primary catalytic converter. Refer to LEFT PRIMARY CATALYTIC CONVERTER .

-- Align exhaust system free of tension. Refer to EXHAUST SYSTEM, INSTALLING .

-- Change engine oil.

-- Replace coolant. Refer to COOLING SYSTEM, DRAINING AND FILLING .