Valvetrain Overview
Valvetrain Overview
1 Intake Camshaft
• Check radial clearance with Plastigage, wear limit: 0.1 mm.
• Runout: maximum 0.01 mm
• Checking axial play. Refer to => [ Camshaft Axial Play, Checking ] Testing and Inspection.
• Identification, refer to => [ Camshaft Identification ] Application and ID.
• Removing and installing, refer to => [ Camshafts ] Camshafts.
2 Camshaft Bearing Cap
• Installed position, refer to => [ Installed Position
of Camshaft Bearing Caps ] Camshafts.
• Installation sequence, refer to => [ Camshafts ] Camshafts.
3 Exhaust Camshaft
• Check radial clearance with Plastigage, wear limit: 0.1 mm.
• Runout: maximum 0.01 mm.
• Checking axial play. Refer to => [ Camshaft Axial Play, Checking ] Testing and Inspection.
• Identification, refer to => [ Camshaft Identification ] Application and ID.
• Removing and installing, refer to => [ Camshafts ] Camshafts.
4 Nut
• 5 Nm + 45° (1/8) additional turn.
5 Seal
• If the seal is leaking, replace all.
• Lubricate the contact surfaces of the seals when installing the control housing.
• Do not spread the seals excessively when installing.
6 Control Housing
• Lubricate the contact surface of the seals before installing,
• Camshaft adjustment valves removing and installing. Refer to => [ Camshaft Adjuster Valves ] Camshaft Adjuster Valves.
• Marks for valve timing, refer to => [ Control Housing Marks ] Testing and Inspection.
• Control housing overview, refer to => [ Control Housing Overview ] Service and Repair.
• Check the control housing strainer for contamination before installing. Refer to => [ Checking Control Housing
Strainer for Contaminants ] Service and Repair.
• Removing and installing, refer to => [ Camshafts ] Camshafts.
7 Bolt
• 8 Nm
• Install using locking fluid (D 000 600 A2).
8 Exhaust Camshaft Adjuster
• Identification: 32A.
• Rotate the engine only with the camshaft adjuster and chain installed.
• Installing, refer to => [ Camshaft Adjuster with Timing Chain, Installing ] Camshaft Adjuster With Timing Chain, Installing.
9 Intake Camshaft Adjuster
• Identification: 24E.
• Rotate the engine only with the camshaft adjuster and chain installed.
• Installing, refer to => [ Camshaft Adjuster with Timing Chain, Installing ] Camshaft Adjuster With Timing Chain, Installing.
10 Bolt
• 60 Nm + 90° (1/4) additional turn.
• Replace
• The sensor wheel contact surface on the bolt head must be dry when installing.
• When removing and installing, counter hold the camshaft with a 27 mm wrench, refer to => [ Camshafts ] Camshafts.
11 Cylinder Head Height
• Minimum height: a = 139.9 mm
12 Drive Sprocket for High Pressure Pump
• Without a mechanical vacuum pump.
With needle bearing inside.
Lubricate the needle bearing before installing.
• With a mechanical vacuum pump;
With inner splines.
The bearing shaft fits only in one way.
13 Bearing Shaft
• Without a mechanical vacuum pump.
Ring groove in shaft points forward.
• With mechanical vacuum pump.
The bearing shaft fits only in one way.
Lubricate the bearing shaft before installing.
14 Valves
• Exhaust valve is filled with sodium.
• Do not regrind, only lapping is permitted.
• Valve dimensions, refer to => [ Valve Dimensions ] [1][2]Specifications.
15 Alignment Bushing
16 Cylinder Head
• Checking for distortion. Refer to => [ Cylinder Head, Checking
for Distortion ] Cylinder Head Overview.
• Removing and installing, refer to => [ Cylinder Head ] Cylinder Head.
• Refacing the valve seats. Refer to => [ Valve Seat, Refacing ] Service and Repair.
• After replacing, replace the entire amount of coolant.
17 Pump Plunger
• Note the installed position, refer to => [ Intake Manifold ] One Piece Intake Manifold.
18 Support Element
• Before installing, check the camshaft axial play. Refer to => [ Camshaft Axial Play, Checking ] Testing and Inspection.
• Do not interchange.
• With hydraulic valve clearance compensation.
19 Valve Stem Seal
• Replacing, refer to => [ Valve Stem Seals ] Service and Repair.
20 Camshaft Timing Chain
• Mark the direction of rotation before removing (installed position). Refer to => [ Marking the Direction
of the Camshaft Timing and Primary Chain ] Service and Repair.
• Installing, refer to => [ Primary Chain, Installing ] Service and Repair.
21 Securing Clip
• Check the clip for secure seating.
22 Roller Rocker Lever
• Before installing, check the camshaft axial play. Refer to => [ Camshaft Axial Play, Checking ] Testing and Inspection.
• Do not interchange.
• Check the roller for ease of movement.
• Lubricate the contact surface.
• Use the securing clip to clip onto the support element when installing.
23 Valve Spring
• Note the installed position.
• Removing and installing, refer to => [ Valve Stem Seals ] Service and Repair.
24 Valve Spring Plate
25 Valve Retainers