VALVETRAIN Component Overview

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

CAUTION:

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

The motor must not be started for about 30 minutes after installing 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: Valvetrain Component Overview

Courtesy of AUDI OF AMERICA, LLC

Camshaft Adjuster, Exhaust Side
- Identification: "32A"
- Removal and installation, refer to CAMSHAFT TIMING CHAIN
Bolt
- For removal and installation, counter-hold at camshaft hex head with open-end spanner, refer to CAMSHAFT TIMING CHAIN
- Replace
- Tightening specifications -23- TIMING CHAIN COMPONENT OVERVIEW Bolt
Camshaft Adjuster, Intake Side
- Identification: "24E"
- Removal and installation, refer to CAMSHAFT TIMING CHAIN
Control Housing
- Removal and installation, refer to CAMSHAFTS
- Check control housing strainer for contamination before installation, refer to Fig 7.
- Lightly lubricate contact surfaces of oil seals before installing
- Disassembling and assembling, refer to Fig 6
Valve Stem Seal
- Replacing, refer to VALVE STEM SEALS WITH CYLINDER HEAD INSTALLED, REPLACING .
Valve Spring
- Installation position: Larger diameter down
Valve Spring Plate
Valve Keys
Compression Ring
- 3 per camshaft
- Replace if leaking
- When replacing compression rings, do not spread too widely
- Install with gaps offset 120°
- When installing control housing -4-, lightly lubricate compression ring contact surface
Nut
- Tightening specifications and tightening sequence, refer to Fig 5
Bearing Cap
- Installed location, refer to Fig 4
- Installation order, refer to Fig 4
Intake Camshaft
- Identification, refer to Fig 2
- Removal and installation, refer to CAMSHAFTS
- Measuring axial play, refer to CAMSHAFT, MEASURING AXIAL PLAY
- Radial clearance, measuring, refer to CAMSHAFT, MEASURING RADIAL PLAY
- Run-out maximum 0.01 mm
Exhaust Camshaft
- Identification, refer to Fig 2
- Removal and installation, refer to CAMSHAFTS
- Measuring axial play, refer to CAMSHAFT, MEASURING AXIAL PLAY
- Radial clearance, measuring, refer to CAMSHAFT, MEASURING RADIAL PLAY
- Run-out maximum 0.01 mm
Roller Rocker Lever
- Do not interchange
- Check roller bearing
- Before installing, check axial play in camshafts, refer to CAMSHAFT, MEASURING AXIAL PLAY
- Lubricate contact surface
- For assembly, clip to the hydraulic adjusting element with securing clip -15-
Securing Clip
- Check for secure seat
Hydraulic Adjusting Elements
- Do not interchange
- Before installing, check axial play in camshafts, refer to CAMSHAFT, MEASURING AXIAL PLAY
- Lubricate contact surface
Cylinder Head
- Check valve guides, refer to VALVE GUIDES, CHECKING
- Reface valve seats, refer to VALVE SEATS, REFACING
Intake Valve
- Do not rework, only lapping is permitted
- Valve dimensions, refer to VALVE DIMENSIONS
- Check valve guides, refer to VALVE GUIDES, CHECKING
- Rework valve seats, refer to VALVE SEATS, REFACING
Exhaust Valve
- Do not rework, only lapping is permitted
- Valve dimensions, refer to VALVE DIMENSIONS
- Check valve guides, refer to VALVE GUIDES, CHECKING
- Rework valve seats, refer to VALVE SEATS, REFACING
Bolt
- 8 Nm

Fig 2: Camshaft Identification, Valve Timing

Courtesy of AUDI OF AMERICA, LLC

The camshaft marking is located between the cylinder 4 and 5 cam pair.

A - Exhaust camshaft; Identification 022 - Index 101

B - Intake camshaft; Identification 022 - Index 102

Fig 3: Coating Bearing Caps 7 And 8 Contact Surface With Adhesive Lubricating Paste

Courtesy of AUDI OF AMERICA, LLC

-- Lightly coat contact surface -shaded- on bearing cap 7 and 8 with adhesive lubricating paste; adhesive lubricating paste.

Fig 4: Identifying Points Of Intake And Exhaust Camshaft Bearing Cap Face Outwards

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Tops of intake and exhaust camshaft bearing caps -arrow A- face toward outside.

Fig 5: Camshafts - Tightening Specifications And Tightening Sequence

Courtesy of AUDI OF AMERICA, LLC

-- Tighten nuts on intake camshaft -A- in 5 stages as follows:

Install bearing cap 5 and 9 nuts alternately and diagonally as far as stop.
Tighten the bearing cap nuts 5 and 9 to 5 Nm plus an additional 45° (¹ /₈ turn).
Tighten the bearing cap nuts 1 and 13 to 5 Nm plus an additional 45° (¹ /₈ turn).
Tighten the bearing cap nuts 7 to 5 Nm plus an additional 45° (¹ /₈ turn).
Tighten the bearing cap nuts 3 and 11 to 5 Nm plus an additional 45° (¹ /₈ turn).

-- Tighten nuts on exhaust camshaft -B- in 5 stages as follows:

Install bearing cap 6 and 10 nuts alternately and diagonally as far as stop.
Tighten the bearing cap nuts 6 and 10 to 5 Nm plus an additional 45° (¹ /₈ turn).
Tighten the bearing cap nuts 2 and 14 to 5 Nm plus an additional 45° (¹ /₈ turn).
Tighten the bearing cap nuts 8 to 5 Nm plus an additional 45° (¹ /₈ turn).
Tighten the bearing cap nuts 4 and 12 to 5 Nm plus an additional 45° (¹ /₈ turn).

Fig 6: Control Housing, Assembly Overview

Courtesy of AUDI OF AMERICA, LLC

Guide track, clipped in at control housing
Control housing
Camshaft Adjustment Valve 1 -N205-
Camshaft Adjustment Valve 1 (exhaust) -N318-
Bolt

Fig 7: Backside Of Control Housing & Screen

Courtesy of AUDI OF AMERICA, LLC

-- Unclip screen -2- on back side of control housing -1- and remove dirt.