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Home >> Volkswagen >> 2018 >> Beetle S, 2D Hatchback >> Repair and Diagnosis >> External Pages >> Different car >> Section 164 (2.5L - Cylinder Head & VALVETRAIN - Engine Code(S): CBTA & CBUA (Hatchback)) >> 15 Cylinder Head, VALVETRAIN >> Description And Operation >> VALVETRAIN Overview

VALVETRAIN Overview

WARNING: This page is about a different car, the 2014 Volkswagen Beetle, 2013 Volkswagen Beetle, and 2012 Volkswagen Beetle. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:

Cylinder heads with cracks between the valve seats, or between the valve seat and the spark plug threads, can continue to be used without reducing the service life, as long as the cracks have a width of maximum 0.3 mm, or only the first 4 threads of the spark plug threads are cracked.

The cylinder head and guide frame must be replaced together.

Do not mill the valve seats in the cylinder head. Only lapping the valves is permitted.

Do not start the engine for approximately 30 minutes after installing the camshafts. The hydraulic adjusting elements must seat themselves (otherwise the valves will seat themselves on the pistons).

After working on the valvetrain and lifters, carefully rotate the crankshaft by hand at least 2 full revolutions before starting to be sure that valves do not strike the pistons.

Always replace the gaskets and seals.

Fig 1: Identifying Valvetrain, Assembly Overview
GWWM15-0170Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
  1. Bolt
    • 8 Nm + 90° turn
    • Replace after removing
  2. Guide Frame
    • Removing and installing, refer to CAMSHAFT .
    • With integrated camshaft bearings
    • Clean sealing surface, reworking is not permitted.
    • Remove old sealant residue.
  3. Chain Sprocket
    • For the exhaust camshaft
  4. Bolt
    • 60 Nm + 90° turn
    • Replace after removing
  5. Bolt
    • 60 Nm + 90° turn
    • Replace after removing
  6. Camshaft Adjuster
    • For the intake camshaft
  7. Seals
    • for camshaft adjuster
    • Installation position, refer to CAMSHAFT 
  8. Timing Chain
  9. Cylinder Head
    • Do not re-grind valve seats, only hand-lapping is permitted.
  10. Hydraulic Valve Play Balancing Element
    • Do not interchange
    • Lubricate contact surface
  11. Valve Retainers
  12. Upper Valve Spring Retainer
  13. Valve Spring
  14. Valve Stem Seal
  15. Valve Guide
  16. Intake Valve
  17. Exhaust Valve
  18. Plug
    • Installing, refer to CAMSHAFT .
    • Replace after removing
  19. Intake Camshaft
    • Removing and installing, refer to CAMSHAFT .
    • Check radial clearance using Plastigage® (roller rocker lever removed)

      Wear limit: 0.1 mm

    • Run-out: maximum 0.035 mm
    • Axial play: maximum 0.17 mm
  20. Exhaust Camshaft
    • Removing and installing, refer to CAMSHAFT .
    • Check radial clearance using Plastigage® (roller rocker lever removed)

      Wear limit: 0.1 mm

    • Run-out: maximum 0.035 mm
    • Axial play: maximum 0.17 mm
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