Part I
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For Valvetrain, Engine With Two Camshaft Adjusters - Part II. Refer to PART II .
- 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
- Valve Stem Seal
- There are different versions. Refer to Fig 4 .
- Replacing. Refer to VALVE STEM SEALS, REMOVING AND INSTALLING .
- Valve Spring
- Valve Spring Retainer
- Valve Retainers
- Hydraulic Lifter
- Do not interchange
- Lubricate the contact surface
- Clip
- For hydraulic lifter
- Roller Rocker Lever
- Mark the installed position for reinstallation.
- Check the roller bearing for ease of movement
- Lubricate the running surfaces before installing
- Removing and installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
- Exhaust Camshaft
- Radial clearance: 0.024 to 0.066 mm
- Run-out: maximum 0.04 mm
- Check the radial clearance using Plastigage® (roller rocker lever removed)
- Removing and installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
- Spring
- No replacement part
- Ball
- For sliding bar
- Installing. Refer to SLIDING BAR BALL, INSTALLING .
- Cylinder Head Cover
- With integrated camshaft bearings
- Clean the sealing surface, reworking is not permitted.
- Remove old sealant residue.
- Removing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
- Bolt
- Intake Camshaft
- Radial clearance: 0.024 to 0.066 mm
- Run-out: maximum 0.04 mm
- Check the radial clearance using Plastigage® (roller rocker lever removed)
- Removing and installing. Refer to CAMSHAFT, REMOVING AND INSTALLING .
- Alignment Pin
- Alignment Pin
- 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-.
- Replace the bolts that were tightened with an additional turn after removing them.
- Pay attention that the cylinder head cover is not tilted.
-- 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 |
A - Valve Stem Seal With A Sealing Lip -A-
- For Intake And Exhaust Side
B - Valve Stem Seal With Two Sealing Lips -B-
- Only for exhaust side, specific engines. Refer to the parts information for the allocation.