Camshaft, Lifters and Push Rods: Service and Repair

Valvetrain Overview






1 Nut

• 5 Nm + 45° (1/8) additional turn.

2 Exhaust Camshaft Bearing Cap

• Installation sequence, refer to => [ Camshafts ] Service and Repair.

3 Seal

• If the seal is leaking, replace all of them.

• Lightly lubricate the contact surface of the seals when installing the control housing.

• Do not spread the seals excessively when installing.

4 Exhaust Camshaft

• Checking radial clearance using Plastigage, Wear limit: 0.1 mm

• Run-out: maximum 0.04 mm

• Checking axial play, refer to => [ Camshaft Axial Play, Checking ] Service and Repair.

• Identification and timing, refer to => [ Camshaft Identification, Valve Timing ] Service and Repair.

• Removing and installing, refer to => [ Camshafts ] Service and Repair.

5 Control Housing

• Lightly lubricate the contact surfaces of the oil seals before installing.

• Overview, refer to => [ Control Housing Disassembling and Assembling ].

• Check the control housing strainer for contamination before installation. Refer to => [ Control Housing, Checking Strainer for Contaminants ].

• Removing and installing, refer to => [ Camshafts ] Service and Repair.

6 Camshaft Timing Chain

• Mark the direction of rotation before removing (installed position). Refer to => [ Timing Chain Marks ] Chain Drive and Cylinder Block and Lubrication Overview.

• Installing, refer to => [ Intermediate Shaft and Timing Chains, Installing ] Intermediate Shaft and Timing Chains, Installing.

7 Exhaust Camshaft Adjuster

• Identification: 32A

• Rotate engine only with camshaft adjuster and chain installed

• Installing, refer to => [ Camshaft Adjuster with Camshaft Timing Chain, Installing ] Camshaft Adjuster with Camshaft Timing Chain, Installing.

8 Bolt

• Replace

• 60 Nm + 90° (1/4) additional turn

• Contact surface of adjuster and bolt head must be dry when installing.

• To remove and install, counter hold at the camshaft using a 32 mm open end wrench. Refer to => [ Camshafts ] Service and Repair.

9 Intake Camshaft Adjuster

• Identification: 24E

• Rotate the engine only with the camshaft adjuster and chain installed.

• Installing, refer to => [ Camshaft Adjuster with Camshaft Timing Chain, Installing ] Camshaft Adjuster with Camshaft Timing Chain, Installing.

10 Cylinder Head Height

• Minimum height: a = 139.9 mm

11 Valves

• Do not grind, only lapping is permitted.

• Valve dimensions, refer to => [ Valve Dimensions ] Service and Repair.

12 Cylinder Head

• Check for distortion, refer to => [ Checking Cylinder Head for Distortion ] Cylinder Head and Cover Overview.

• Removing and installing, refer to => [ Cylinder Head ] Cylinder Head.

• Refacing valve seats, refer to => [ Valve Seat, Refacing ] Service and Repair.

• After replacing replace entire amount of coolant

13 Support Element

• Before installing, check the camshaft axial play. Refer to => [ Camshaft Axial Play, Checking ] Service and Repair.

• Do not interchange

• With hydraulic valve clearance compensation

14 Valve Stem Seal

• Replacing, refer to => [ Valve Stem Seals ] Service and Repair.

15 Clip

• Check the clip for secure seating.

16 Roller Rocker Lever

• Before installing, check the camshaft axial play. Refer to => [ Camshaft Axial Play, Checking ] Service and Repair.

• Do not interchange

• Check roller for ease of movement

• Lubricate contact surface

• Use securing clip to clip onto the support element when installing

17 Valve Spring

• Note the installed position.

• Removing and installing, refer to => [ Valve Stem Seals ] Service and Repair.

18 Valve Spring Plate

19 Valve Retainers

20 Intake Camshaft Bearing Cap

• Installation sequence, refer to => [ Camshafts ] Service and Repair.

21 Intake Camshaft

• Checking radial clearance using Plastigage, Wear limit: 0.1 mm

• Runout: maximum 0.04 mm

• Checking axial play, refer to => [ Camshaft Axial Play, Checking ] Service and Repair.

• Identification and timing, refer to => [ Camshaft Identification, Valve Timing ] Service and Repair.

• Removing and installing, refer to => [ Camshafts ] Service and Repair.

Control Housing Disassembling and Assembling





1 Guide rail: clipped to the control housing
2 Control housing
3 Camshaft adjustment valve 1 (N205)
4 Exhaust camshaft adjustment valve 1 (N318)
5 8 Nm (using locking adhesive (D 000 600 A2) )

Control Housing, Checking Strainer for Contaminants





- Unclip the strainer - 2 - at the rear side of the control housing - 1 - and remove any possible contamination.