Cylinder Head: Removing

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.

NOTE:

Removal and installation at left cylinder head is depicted in the following description.

All cable ties opened or cut during engine removal must be reinstalled at the same locations during installation.

-- Drain the coolant. Refer to COOLING SYSTEM, DRAINING AND FILLING .

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

-- Remove electrical connectors -1- and -2- for Knock Sensor (KS) 3 -G198- and KS 4 -G199- from bracket.

Fig 1: Identifying Knock Sensor Electrical Connectors

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-- Version 1: Remove air guide hose to Secondary Air Injection (AIR) combi-valves -arrows-.

Fig 2: Identifying Air Guide Hose To Secondary Air Injection (AIR) Combi-Valves

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-- Version 2: Remove the vacuum hoses -1 and 3- from the secondary air injection combination valves.

Fig 3: Identifying Vacuum Hoses -1- And -3- And Air Guide Hose -2-

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-- Remove the air guide hose -2- to the secondary air injection combination valves -arrows-.

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

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

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

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

-- Remove camshaft timing chains from camshafts. Refer to CAMSHAFT TIMING CHAINS, REMOVING FROM CAMSHAFTS .

-- Remove bolts -1 and 2- and remove right chain tensioner.

Fig 4: Identifying Bolts For Left Chain Tensioner And Left Camshaft Timing Chain

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-- Disconnect electrical connectors -arrows- at fuel injectors.

Fig 5: Disconnecting Electrical Connectors At Fuel Injectors & Removing High Pressure Lines From Connector On Fuel Rail

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-- Remove high pressure line -2- from connector on fuel rail.

-- Remove high pressure line -1- from connector on fuel rail. To do this, counter hold at hex head with and open-end wrench and loosen the union nut.

NOTE:

Do not change the angles of the high pressure lines.

-- Remove locking bolt -arrow-.

Fig 6: Identifying Locking Bolt

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-- Remove the bolts -arrows-.

Fig 7: Cylinder Head Bolts Loosening Sequence

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Refer to Removing .

-- Remove cylinder head bolts and carefully remove cylinder head.

-- Lay cylinder head on a soft surface (foam).