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: