Overview - Valve Train, 1.8L Engine

Fig 1: Exploded View Of Valve Train, 1.8L Engine

Courtesy of AUDI OF AMERICA, LLC

1. Exhaust Valve
   • Do not rework, only lapping is permitted
   • Valve Dimensions. Refer to VALVE GUIDES, CHECKING .
   • Valve Guides, Checking. Refer to VALVE GUIDES, CHECKING .
2. Cylinder Head
3. Valve Guide
   • Checking. Refer to VALVE GUIDES, CHECKING .
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
   • Do not interchange
   • Lubricate the contact surface
9. Exhaust Camshaft
   • Removing and installing. Refer to CAMSHAFT, REMOVING AND INSTALLING, 1.8L ENGINE 
   • Check the radial clearance using Plastigauge^® (roller rocker lever removed)
   • Radial clearance: 0.024 to 0.066 mm
   • Run-out: maximum 0.04 mm
10. Cylinder Head Cover
    • With integrated camshaft bearings
    • Removing and installing. Refer to CAMSHAFT, REMOVING AND INSTALLING, 1.8L ENGINE 
    • Clean the sealing surface, reworking is not permitted.
    • Remove old sealant residue.
    • Only replace together with the cylinder head
11. Bolt
    • Tightening specification and sequence. Refer to Fig 3.
    • Always replace after removing
    • Loosening. Refer to Fig 2.
12. O-ring
    • Always replace after removing
    • Lubricate with engine oil
13. Plug
14. Intake Camshaft
    • Removing and installing. Refer to CAMSHAFT, REMOVING AND INSTALLING, 1.8L ENGINE 
    • Check the radial clearance using Plastigauge^® (roller rocker lever removed)
    • Radial clearance: 0.024 to 0.066 mm
    • Run-out: maximum 0.04 mm
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 GUIDES, CHECKING .
    • Valve Guides, Checking. Refer to VALVE GUIDES, CHECKING .

Fig 2: Cylinder Head Cover Loosening Sequence (1 of 2)

Courtesy of AUDI OF AMERICA, LLC

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

Fig 3: Cylinder Head Cover Tightening Sequence (2 of 2)

Courtesy of AUDI OF AMERICA, LLC

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