Overview - VALVETRAIN
WARNING: This page is about a different variant/trim than selected.
NOTE:
The cylinder head for cylinder bank 2 (left) is shown in the illustration.
- Sealing Plug
- Install with sealant.
- Cylinder Head
- Valve guides, checking. Refer to VALVE GUIDES, CHECKING
- Valve Stem Seal
- Replacing with the cylinder head installed. Refer to VALVE STEM SEALS, CYLINDER HEAD INSTALLED, REMOVING AND INSTALLING .
- Replacing with the cylinder head removed. Refer to VALVE STEM SEALS, REMOVING AND INSTALLING WITH CYLINDER HEAD REMOVED .
- Valve Spring
- Installed position. Refer to Fig 2
- Hydraulic Adjusting Element
- Clipped into roller rocker lever -item 8-
- Checking. Refer to HYDRAULIC ADJUSTING ELEMENTS, CHECKING
- Mark the installed position for installation later
- Lubricate the running surfaces before installing
- Valve Spring Retainer
- Valve Keepers
- Roller Rocker Lever
- Mark the installed position for installation later
- Check roller for easy movement
- Lubricate the running surfaces before installing
- To assemble, clip onto the hydraulic adjusting element -item 9- with securing clip -item 5-
- Clip
- Not available individually
- Make sure it is secure
- Intake Camshaft
- Removing and installing. Refer to CAMSHAFTS, REMOVING AND INSTALLING
- Axial play, measuring. Refer to CAMSHAFTS, CHECKING AXIAL CLEARANCE
- Radial play, measuring. Refer to CAMSHAFT, MEASURING RADIAL CLEARANCE
- Maximum run-out: 0.04 mm
- Bolt
- Replace
- Tightening specification and sequence. Refer to Fig 3
- Guide Frame
- With integrated camshaft bearings
- Removing and installing. Refer to CAMSHAFTS, REMOVING AND INSTALLING
- Flat Ring
- Flat Ring
- Exhaust Camshaft
- Removing and installing. Refer to CAMSHAFTS, REMOVING AND INSTALLING
- Axial play, measuring. Refer to CAMSHAFTS, CHECKING AXIAL CLEARANCE
- Radial play, measuring. Refer to CAMSHAFT, MEASURING RADIAL CLEARANCE
- Maximum run-out: 0.04 mm
- Oil Screen
- Installed depending on the version.
- Intake Valve
- Do not rework, only lapping is permitted
- Mark the installed position for installation later
- Checking. Refer to VALVES, CHECKING
- Valve dimensions. Refer to VALVE DIMENSIONS
- Valve guides, checking. Refer to VALVE GUIDES, CHECKING
- Exhaust Valve
- Do not rework, only lapping is permitted
- Mark the installed position for installation later
- Checking. Refer to VALVES, CHECKING
- Valve dimensions. Refer to VALVE DIMENSIONS
- Valve guides, checking. Refer to VALVE GUIDES, CHECKING
- The tight spring coils -arrow- face toward the cylinder head.
NOTE:
The guide frame for the left cylinder head camshaft is shown in the illustration. The right cylinder head is identical.
Replace any bolts that were tightened with an additional turn.
-- Tighten the bolts in three steps and in the sequence shown:
| Step | Bolts | Tightening Specification/Additional Turn |
|---|---|---|
| 1. | -1 to 21- | Install all the way in by hand.
|
| 2. | -1 to 21- | 8 Nm |
| 3. | -1 to 21- | Tighten 90° additional turn |