Valvetrain Component Overview
Valvetrain Component Overview
1 65 Nm
• Use counter-holder (3036) to loosen and tighten
2 Camshaft pulley for the exhaust camshaft
• Note installation position: The thin rib of camshaft gear points outward and cylinder 1 TDC marking is visible => [ Install camshaft pulley. ] Exhaust Camshaft Seal
3 Exhaust camshaft sealing ring
• Replacing, refer to => [ Exhaust Camshaft Seal ] Exhaust Camshaft Seal.
4 Cylinder Head
• See note, refer to => [ Valvetrain ] Valvetrain
• Check valve guides, refer to => [ Valve Guides, Checking ] Testing and Inspection
• Rework valve seats, refer to => [ Valve Seats, Reworking ] Service and Repair
• The sleeves for the bearing cover must fit inside the cylinder head
• Seal contact surfaces with sealant before installing => [ Seal contact surfaces of double bearing cap/cylinder
head ] Cylinder Head Assembly Overview and => [ Seal contact surfaces of camshaft adjuster/cylinder
head ] Cylinder Head Assembly Overview
5 Valve guide
• Checking, refer to => [ Valve Guides, Checking ] Testing and Inspection
6 Valve stem seal
• Replacing, refer to => [ Valve Stem Seals ] Service and Repair.
7 Valve spring
• Removing and installing, refer to => [ Valve Stem Seals ] Service and Repair
8 Valve spring plate
9 Valve keys
10 Hydraulic valve lifter
• Checking, refer to => [ Hydraulic Valve Lifter, Checking ] Testing and Inspection
• Removing and installing, refer to => [ Valve Stem Seals ] Service and Repair
• Do not interchange
• Place on running surface when setting down
• Before installing, check axial play in camshafts, refer to => [ Camshafts, Checking Axial Clearance ] Camshafts, Checking Axial Clearance
• Lubricate contact surface
11 Intake camshaft
• Check the radial play with Plastigage (valve lifter removed)
• Radial clearance wear limit: 0.1 mm
• Run-out: Max. 0.035 mm
• Checking axial play, refer to => [ Camshafts, Checking Axial Clearance ] Camshafts, Checking Axial Clearance
• Camshaft, removing and installing, refer to => [ Camshafts and Camshaft Adjuster ] Camshafts and Camshaft Adjuster
12 Intake camshaft bearing cover
• Must be located on dowel sleeves
• The sleeves must fit inside the cylinder head
• Note installation position
• Installation order => [ Tighten bearing covers 2 and 4 for the
intake and exhaust camshaft diagonally while paying close attention to the
dowel sleeves. ] Camshafts and Camshaft Adjuster
13 Double bearing cap
• Must be located on dowel sleeves
• The sleeves must fit inside the cylinder head
• Before installing, lightly coat the sealing surfaces with sealant
• Seal contact surfaces of double bearing cap/cylinder head => [ Seal contact surfaces of double bearing cap/cylinder
head ] Cylinder Head Assembly Overview
14 Exhaust camshaft
• Check the radial play with Plastigage (valve lifter removed)
• Radial clearance wear limit: 0.1 mm
• Run-out: max. 0.035 mm
• Checking axial play, refer to => [ Camshafts, Checking Axial Clearance ] Camshafts, Checking Axial Clearance
• Camshaft, removing and installing, refer to => [ Camshafts and Camshaft Adjuster ] Camshafts and Camshaft Adjuster
15 Exhaust camshaft bearing cover
• Must be located on dowel sleeves
• The sleeves must fit inside the cylinder head
• Note installation position
• Installation order => [ Tighten bearing covers 2 and 4 for the
intake and exhaust camshaft diagonally while paying close attention to the
dowel sleeves. ] Camshafts and Camshaft Adjuster
16 10 Nm
17 10 Nm
18 Drive chain
• Check for wear
• Removing and installing, refer to => [ Camshafts and Camshaft Adjuster ] Camshafts and Camshaft Adjuster
• If the old drive chain is going to be used again, mark the installation position before removing it => [ If re-using the old drive chain: ] Camshafts and Camshaft Adjuster
19 Camshaft adjuster
• With camshaft adjustment valve 1 (N205)
• Before removing, secure with chain tensioner retainer (3366)
• Removing and installing, refer to => [ Camshafts and Camshaft Adjuster ] Camshafts and Camshaft Adjuster
• Seal contact surfaces of camshaft adjuster/cylinder head => [ Seal contact surfaces of camshaft adjuster/cylinder
head ] Cylinder Head Assembly Overview
• Check the camshaft adjustment in "Guided Fault Finding".
20 Rubber/metal seal
• Coat with sealant before installing => [ Replace the camshaft adjuster bonded rubber
seal and lightly coat the with sealant. ] Camshafts and Camshaft Adjuster
21 Gasket
• Replace
22 Exhaust valve
• With sodium filling
• Always observe the instructions for disposing of sodium filled valves, refer to => [ Valve Dimensions ] [1][2]Specifications
• Do not rework, only lapping is permitted
• Valve dimensions, refer to => [ Valve Dimensions ] [1][2]Specifications
• Check valve guides, refer to => [ Valve Guides, Checking ] Testing and Inspection
• Rework valve seats, refer to => [ Valve Seats, Reworking ] Service and Repair
23 Intake valve
• Do not rework, only lapping is permitted
• Valve dimensions, refer to => [ Valve Dimensions ] [1][2]Specifications
• Check valve guides, refer to => [ Valve Guides, Checking ] Testing and Inspection
• Rework valve seats, refer to => [ Valve Seats, Reworking ] Service and Repair
24 Intake camshaft sealing ring
• Replacing, refer to => [ Intake Camshaft Sealing Ring ] Intake Camshaft Sealing Ring.
25 Cover for Camshaft Position (CMP) Sensor
• Note installation position: Insert the tab into the notch in the camshaft
26 Washer
• With taper
• Note installation position
27 25 Nm
28 Camshaft position sensor (G40) housing
29 10 Nm