Camshaft, Lifters and Push Rods: Description and Operation

Valvetrain Overview





1 Valve

• Replace if there are signs of wear on the stem and seating surface.

• Do not grind, only lapping is permitted.

• Mark the installed position for installation later.

• Valve dimensions, refer to => [ Valve Dimensions ] [1][2]Specifications.

• Valve guide checking, refer to => [ Valve Guide, Checking ] Testing and Inspection.

2 Cylinder Head

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

3 Valve Stem Seal

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

4 Valve Spring

5 Valve Spring Plate

6 Valve Retainers

7 Camshaft Seal

• Replacing, refer to => [ Camshaft Seal ] Service and Repair.

8 Bolt

• 9 Nm

• Observe the tightening sequence, refer to => [ Camshafts ] Camshafts.

9 Nut

• 9 Nm

• Observe the tightening sequence, refer to => [ Camshafts ] Camshafts.

10 Guide Frame

• With integrated camshaft bearings.

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

11 Intake Camshaft

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

• Checking axial play, refer to => [ Camshaft Axial Clearance, Checking ] Testing and Inspection.

• Check radial clearance using Plastigage (roller rocker lever removed).

• New radial clearance: 0.035 to 0.085 mm

• Radial clearance wear limit: 0.1 mm

• Runout: maximum 0.01 mm

12 Exhaust Camshaft

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

• Checking axial play => [ Camshaft Axial Clearance, Checking ] Testing and Inspection.

• Check radial clearance using Plastigage (roller rocker lever removed).

• New radial clearance: 0.035 to 0.085 mm

• Radial clearance wear limit: 0.1 mm

• Runout: maximum 0.01 mm

13 Roller Rocker Lever

• Mark the installed position.

• Do not interchange.

• Check the roller for ease of movement.

• Lubricate the contact surface.

14 Hydraulic Adjusting Elements

• Mark the installed position.

• Checking, refer to => [ Hydraulic Adjusting Element, Checking ] Testing and Inspection.

• Lubricate the running surfaces before installing.

15 Pressure Relief Valve

• 25 Nm

• For lubricating points in the cylinder head.