Overview - VALVETRAIN, Engine Without Camshaft Adjustment

WARNING: This page is about a different car, the 2018 Audi Q3 Quattro, 2018 Audi Q3, 2017 Audi Q3 Quattro, and 2017 Audi Q3. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Valvetrain, Engine Without Camshaft Adjustment Exploded View

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
- Overview. Refer to OVERVIEW - CYLINDER HEAD .
Valve Guide
- Checking. Refer to Vehicle Diagnostic Tester.
Valve Stem Seal
- Replacing. Refer to VALVE STEM SEALS, REMOVING AND INSTALLING .
Valve Spring
Valve Spring Retainer
Valve Retainers
Hydraulic Lifter
- With roller rocker lever
- Mark the installed position for reinstallation.
- Lubricate the running surfaces before installing
Exhaust Camshaft
- Radial clearance: 0.024 to 0.066 mm
- Run-out: maximum 0.04 mm
- Check the radial clearance using Plastigauge^® (roller rocker lever removed)
- Removing and installing. Refer to CAMSHAFT, REMOVING AND INSTALLING, ENGINE WITHOUT CAMSHAFT ADJUSTMENT .
Cylinder Head Cover
- With integrated camshaft bearings
- Clean the sealing surface, reworking is not permitted.
- Remove old sealant residue.
- Only replace together with the cylinder head
- Removing and installing. Refer to CAMSHAFT, REMOVING AND INSTALLING, ENGINE WITHOUT CAMSHAFT ADJUSTMENT .
Bolt
- Tightening specification and sequence. Refer to Fig 2.
- Always replace after removing.
- Loosening. Refer to 16.
O-ring
- Always replace after removing.
- Lubricate with engine oil
Plugs
Intake Camshaft
- Radial clearance: 0.024 to 0.066 mm
- Run-out: maximum 0.04 mm
- Check the radial clearance using Plastigauge^® (roller rocker lever removed)
- Removing and installing. Refer to CAMSHAFT, REMOVING AND INSTALLING, ENGINE WITHOUT CAMSHAFT ADJUSTMENT .
Cap
- Always replace after removing.
- 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 .

-- Loosen the cylinder head cover in the sequence -1 through 6-.

Fig 2: Cylinder Head Cover Loosening Sequence

Courtesy of AUDI OF AMERICA, LLC

-- Tighten the bolts in the steps shown in the sequence:

Step	Bolts	Tightening Specification/Additional Turn
1.	-1 to 6-	Install all the way in multiple steps by hand
2.	-1 to 6-	8 Nm
3.	-1 to 6-	90° additional turn

TIP:

Make sure that the cylinder head cover is not tilted.