VALVETRAIN Overview

WARNING: This page is about a different variant/trim than selected.

CAUTION:

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

The motor must not be started for about 30 minutes after installing the camshafts because the hydraulic equalization elements must seat themselves.
To ensure valves do not strike pistons when starting, carefully rotate engine at least 2 full revolutions.

Fig 1: Identifying Cylinder Head, Camshafts, Overview

Courtesy of AUDI OF AMERICA, LLC

Bolt
- Replace
- Loosen and tighten with retainer 3036
- Tightening specifications TOOTHED BELT DRIVE OVERVIEW
Toothed Belt Camshaft Gear
Shaft Seal
- For exhaust camshaft
- Removing and installing, refer to EXHAUST CAMSHAFT SEAL
Cylinder Head
Valve Guide
- Checking, refer to VALVE GUIDES, CHECKING
Valve Stem Seal
- Replace, refer to VALVE STEM SEALS WITH CYLINDER HEAD INSTALLED , VALVE STEM SEALS WITH CYLINDER HEAD REMOVED
Valve Spring
Valve Spring Plate
Valve Keys
Hydraulic Adjusting Elements
- With roller rocker lever and clip
- Mark the installed position for installation later
- Lubricate contact surfaces
Fitted Key
- Make sure it is secure
Exhaust Camshaft
- Removing and Installing, refer to CAMSHAFTS
- Measuring axial play, refer to CAMSHAFT, MEASURING AXIAL PLAY
- Radial clearance, measuring, refer to CAMSHAFT, MEASURING RADIAL PLAY
- Maximum run out: 0.04 mm
Guide Frame
- With integrated camshaft bearings
- Do not rework the sealing surfaces, only clean them.
- Only replace together with the cylinder head.
Bolt
- Replace
- Tightening specification and sequence, refer to Fig 2
Camshaft Adjuster
- Removing and installing, refer to CAMSHAFT ADJUSTER
Bolt
- Replace
- 20 Nm plus an additional 45° turn
Intake Camshaft
- Removing and installing, refer to CAMSHAFTS
- Measuring axial play, refer to CAMSHAFT, MEASURING AXIAL PLAY
- Radial clearance, measuring, refer to CAMSHAFT, MEASURING RADIAL PLAY
- Maximum run out: 0.04 mm
Chain Tensioner
- Removing, refer to CAMSHAFT ADJUSTER
- Before removing, secure with locking pin T10115
Drive Chain
Bolt
- Replace
- 9 Nm
- Self-locking
Bolt
- Tightening specifications CYLINDER HEAD COVER AND CYLINDER HEAD OVERVIEW
Camshaft Position Sensor -G40-
- Illustration does not correspond to version in vehicle
Exhaust Valve
- Do not rework, only lapping is permitted
- For the correct valve dimensions, refer to VALVE DIMENSIONS
- Valve Guides, Checking, refer to VALVE GUIDES, CHECKING
Intake Valve
- Do not rework, only lapping is permitted
- For the correct valve dimensions, refer to VALVE DIMENSIONS
- Valve guides, checking, refer to VALVE GUIDES, CHECKING
Cover
- Replace
- Removing: With the guide frame installed, pierce through one side of the cover with an awl and pry it out.
- Installing: Press in 1 to 2 mm without sealant using the thrust piece 3334

Fig 2: Identifying Cylinder Head Bolts Tightening Sequence

Courtesy of AUDI OF AMERICA, LLC

-- Replace the guide frame bolts.

-- Tighten bolts in 3 stages in -1 to 6- sequence as follows:

-- Install bolts by hand as far as stop.

The guide frame must be in contact with the entire contact surface of the cylinder head.

-- Tighten to 8 Nm.

-- Tighten an additional 90°.