Valvetrain Assembly Overview
Valvetrain Assembly Overview
1 Bolt, 8 Nm + 90° (1/4) additional turn
• Replace
2 Guide Frame
• Removal and installation, refer to => [ Camshafts ] Service and Repair.
• With integrated camshaft bearings.
• Clean the sealing surface, reworking is not permitted.
• Remove old sealant residue.
3 Exhaust Camshaft Sprocket
4 Bolt, 60 Nm + 90° (1/4) additional turn
• Replace
5 Bolt, 60 Nm + 90° (1/4) additional turn
• Replace
6 Intake Camshaft Adjuster
7 Seals
• For the camshaft adjuster.
• Note the installed position, refer to => [ Camshafts ] Service and Repair.
8 Timing Chain
• Removing from the sprocket/actuator, refer to => [ Valve Timing, Adjusting ] Adjustments.
9 Cylinder Head
• Do not grind the valve seats, only lapping is permitted.
10 Hydraulic Valve Play Balancing Element
• Do not interchange
• Lubricate the contact surface.
11 Valve Keepers
12 Top Valve Spring Retainer
13 Valve Spring
14 Valve Stem Seal
• Replacing, refer to => [ Valve Stem Seals ] Service and Repair.
15 Valve Guide
• Checking, refer to => [ Valve Guides, Checking ] Testing and Inspection.
16 Intake Valve
• Do not grind, only lapping is permitted.
• Valve dimensions, refer to => [ Valve Dimensions ] [1][2]Specifications.
• Checking valve guides, refer to => [ Valve Guides, Checking ] Testing and Inspection.
17 Exhaust Valve
• Do not grind, only lapping is permitted.
• Valve dimensions, refer to => [ Valve Dimensions ] [1][2]Specifications.
• Checking valve guides, refer to => [ Valve Guides, Checking ] Testing and Inspection.
18 Sealing Plugs
• Replace
• Installing, refer to => [ Camshafts ] Service and Repair.
19 Intake Camshaft
• Removal and installation, refer to => [ Camshafts ] Service and Repair.
• Check radial clearance using Plastigage(R) (roller rocker lever removed).
Wear limit: 0.1 millimeter (mm)
• Runout: Max. 0.035 mm
• Axial clearance: Max. 0.17 mm
20 Exhaust Camshaft
• Removal and installation, refer to => [ Camshafts ] Service and Repair.
• Check radial clearance using Plastigage(R) (roller rocker lever removed).
Wear limit: 0.1 mm
• Runout: Max. 0.035 mm
• Axial clearance: Max. 0.17 mm