Overview - VALVETRAIN

WARNING: This page is about a different car, the 2016 Audi Q3 Quattro, 2016 Audi Q3, 2015 Audi Q3 Quattro, and 2015 Audi Q3. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

The cylinder head and the cylinder head cover must be replaced together.

Do not start the engine for approximately 30 minutes after installing the camshafts. The hydraulic equalization elements must seat themselves (otherwise the valves will crash into the pistons).

After working on the valvetrain and lifters, carefully rotate the crankshaft by hand at least two full revolutions before starting to be sure that valves do not strike the pistons.

Always replace the gaskets and seals.

Courtesy of AUDI OF AMERICA, LLC

Exhaust Valve
- Do not rework, only lapping is permitted
- Valve dimensions. Refer to VALVE DIMENSIONS .
- Valve guides, checking. Refer to VALVE GUIDES, CHECKING .
Cylinder Head
Valve Guide
- Checking. Refer to VALVE GUIDES, CHECKING .
Valve Stem Seal
- Replacing: with the cylinder head installed. Refer to VALVE STEM SEALS, REMOVING AND INSTALLING, CYLINDER HEAD INSTALLED .
- Replacing with the cylinder head removed. Refer to VALVE SHAFT SEALS, REMOVING AND INSTALLING, CYLINDER HEAD REMOVED .
Valve Spring
Valve Spring Retainer
Valve Retainers
Hydraulic Adjusting Element
- With roller rocker lever
- Do not interchange
- Lubricate contact surface
Exhaust Camshaft
- Removing and installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
- Check radial clearance using Plastigauge^® (roller rocker lever removed)
- Use old bolts for radial clearance measurement. Tightening sequence. Refer to Fig 1
- Replace bolts for the final assembly
- Radial clearance: 0.024 to 0.066 mm
- Runout: maximum 0.04 mm
Cylinder Head Cover
- With integrated camshaft bearings
- Clean sealing surface, reworking is not permitted.
- Remove old sealant residue.
Bolt
- Always replace
- Loosening. Refer to 16
- Tightening specification and sequence. Refer to Fig 1.
O-Ring
- Always replace
- Coat with engine oil
Plug
Intake Camshaft
- Removing and installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
- Check radial clearance using Plastigage^® (roller rocker lever removed)
- Use old bolts for radial clearance measurement. Tightening sequence. Refer to Fig 1
- Replace bolts for the final assembly
- Radial clearance: 0.024 to 0.066 mm
- Runout: maximum 0.04 mm
Cover
- Always replace
- Removing: with the cylinder head cover installed, pierce through one side of the cover with an awl and pry it out
- Installing. Refer to Installing
Intake Valve
- Do not rework, only lapping is permitted
- Valve dimensions. Refer to VALVE DIMENSIONS .
- Valve guides, checking. Refer to VALVE GUIDES, CHECKING .

Courtesy of AUDI OF AMERICA, LLC

-- Loosen the cylinder head cover in the following sequence: -1 to 6-.

Fig 1: Cylinder Head Cover Loosening Sequence

Courtesy of AUDI OF AMERICA, LLC

-- Replace the bolts.

-- Hand-tighten bolts in several steps in -1 to 6- sequence.

-- Tighten the bolts in a -1 to 6- sequence to 8 Nm using a torque wrench.

-- Tighten the bolts an additional 90° using a rigid wrench in the sequence -1 to 6-.

NOTE:

Make sure the cylinder head cover is not tilted.