Cylinder Head, Installing: Notes

WARNING: This page is about a different car, the 2018 Audi A6 Quattro, 2017 Audi A6 Quattro, and 2016 Audi A6 Quattro. However, it is still accessible from the selected car via links, so may be relevant.

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 sealant residue from cylinder head and cylinder block. Make sure that no long scrapes or scratches result.
Carefully remove all grinding and sanding residue.
Only unpack new cylinder head gasket immediately prior to installation.
To prevent cylinder head gasket silicone layer and recessed area from being damaged, always handle seal extremely carefully.

Risk of damaging open valves.

If a replacement cylinder 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 valve train.

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

NOTE:

Replace the bolts that were tightened with an additional turn.

Replace the self-locking nuts, sealing rings, seals and O-rings after removal.

Note different sealant for cylinder head sealing surfaces and bolts. Refer to the parts information.

If a replacement cylinder 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.

The coolant and engine oil must be changed whenever replacing the cylinder head or cylinder head seal.

If the connection -arrow- is loosened of removed, it must be replaced.

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Camshafts on the right cylinder head secured in "TDC" using the :T40133/1 bolts -arrows- (25 Nm).

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The :T40133/1 is correctly positioned when the holes for the cylinder head bolts remain free.

Camshafts on the left cylinder head secured in "TDC" using the :T40133/2 bolts -arrows- (25 Nm).

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The :T40133/2 is correctly positioned when the holes for the cylinder head bolts remain free.

Crankshaft -1- secured in "TDC" using :T40069 .

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-- Install the new seals on the coolant pipe.

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-- Position the cylinder head gasket.

Installed position: the marking "oben" (top) or the part number must be legible.
Pay close attention to alignment bushings in cylinder block -arrows-.

-- Set the cylinder head in place.

-- Tighten the cylinder head bolts. .

-- Tighten the bolts -arrows-.

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NOTE:

It is not necessary to retighten the cylinder head bolts after repairs.

Installation is performed in reverse order of removal, while noting the following:

-- Install the camshafts. Refer to CAMSHAFT, REMOVING AND INSTALLING .

-- Install the left front coolant pipe. Refer to FRONT LEFT COOLANT PIPE, REMOVING AND INSTALLING .

-- Install the MPI injection fuel line. Refer to FUEL LINE, REMOVING AND INSTALLING .

-- Install the upper coolant pipe. Refer to UPPER COOLANT PIPE, REMOVING AND INSTALLING .

-- Install the right front coolant pipe. Refer to RIGHT FRONT COOLANT PIPE, REMOVING AND INSTALLING .

-- Electrical connections and wiring routing. Refer to the Appropriate Wiring Diagram.

-- Change the engine oil.

-- Change the coolant. Refer to COOLANT, DRAINING AND FILLING .