Overview - Valve Train, 1.8L Engine

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

Courtesy of AUDI OF AMERICA, LLC

Exhaust Valve
- Do Not Rework, Only Lapping Is Permitted
- Valve Dimensions. Refer To VALVE GUIDES, CHECKING .
- Valve Guides, Checking. Refer To VALVE GUIDES, CHECKING .
Cylinder Head
Valve Guide
- Checking. Refer To VALVE GUIDES, CHECKING .
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
- Do Not Interchange
- Lubricate The Contact Surface
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
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
Bolt
- Tightening Specification And Sequence. Refer To Fig 3.
- Always Replace After Removing
- Loosening. Refer To Fig 2.
O-ring
- Always Replace After Removing
- Lubricate With Engine Oil
Plug
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
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 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:

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

NOTE:

Make Sure That The Cylinder Head Cover Is Not Tilted.