Overview - VALVETRAIN, Engine Without Camshaft Adjustment

Fig 1: Valvetrain, Engine Without Camshaft Adjustment Exploded View

Courtesy of AUDI OF AMERICA, LLC

1. Exhaust Valve
   • Do not rework, only lapping is permitted
   • Valve Dimensions. Refer to VALVE DIMENSIONS .
   • Valve Guides, Checking. Refer to VALVE GUIDES, CHECKING .
2. Cylinder Head
   • Overview. Refer to OVERVIEW - CYLINDER HEAD .
3. Valve Guide
   • Checking. Refer to Vehicle Diagnostic Tester.
4. Valve Stem Seal
   • Replacing. Refer to VALVE STEM SEALS, REMOVING AND INSTALLING .
5. Valve Spring
6. Valve Spring Retainer
7. Valve Retainers
8. Hydraulic Lifter
   • With roller rocker lever
   • Mark the installed position for reinstallation.
   • Lubricate the running surfaces before installing
9. 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 .
10. 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 .
11. Bolt
    • Tightening specification and sequence. Refer to Fig 2.
    • Always replace after removing.
    • Loosening. Refer to  16.
12. O-ring
    • Always replace after removing.
    • Lubricate with engine oil
13. Plugs
14. 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 .
15. 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 .
16. 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:

TIP: 

Make sure that the cylinder head cover is not tilted.