Overview - Valve Train

Fig 1: Valve Train Overview

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1. Bolt
   • 100 Nm
   • Use Counterhold - Crankshaft Sprocket 3415 when loosening or tightening
2. Camshaft Sprocket
3. Sealing Ring
   • Replacing, refer to CAMSHAFT SEAL, REMOVING AND INSTALLING .
4. Woodruff Key
   • Make sure it is secure
5. Bolt
   • 20 Nm
6. Bearing Cap
   • Installed position, refer to Fig 4
   • Installation order, refer to CAMSHAFT, REMOVING AND INSTALLING 
   • Lightly coat the contact surface of bearing cap 1 with SealantAMV 174 004 01.
7. Camshaft
   • Axial Play, Checking, refer to Fig 3.
   • Removing and installing, refer to CAMSHAFT, REMOVING AND INSTALLING .
   • Check radial clearance with Plastigage^®

     Wear limit: 0.1 mm Run-out: max. 0.05 mm

8. Hydraulic Valve Lifter
   • Do not interchange
   • With hydraulic valve clearance compensation
   • Checking, refer to HYDRAULIC VALVE LIFTER, CHECKING .
   • Place on running surface when setting down
   • Before installing, check axial play of camshafts, refer to Fig 3
   • Lubricate contact surface
9. Valve Retainers
10. Upper Valve Spring Retainer
11. Valve Spring
    • Removing and installing:
      • Cylinder head removed using Valve Spring Compressor2037
      • Cylinder head installed, refer to VALVE STEM SEALS, REMOVING AND INSTALLING .
12. Valve Stem Seal
    • Replacing, refer to VALVE STEM SEALS, REMOVING AND INSTALLING .
13. Valve Guide
    • Checking, refer to VALVE GUIDES, CHECKING .
    • Replacing, refer to VALVE GUIDES, REPLACING .
    • Repair guide with shoulder
14. Cylinder Head
    • Resurfacing sealing surfaces, refer to Fig 2
    • Valve seats, reworking, refer to VALVE SEATS, REWORKING .
15. Valves
    • Do not rework, only lapping is permitted
    • Valve dimensions, refer to Fig 5
16. Rear Toothed Belt Guard
17. Bolt
    • 20 Nm
18. Camshaft Position Sensor -G40-

Fig 2: Cylinder Head Reworking Limit

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Reworking dimension, cylinder head:

• -a- = minimum 132.6 mm

Fig 3: Camshaft Axial Clearance, Checking

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Special tools and workshop equipment required 

• Dial Gauge Holder VW387
• Dial Gauge

Test Sequence 

-- Measure with valve lifters removed and with first and last bearing cap installed.

• Wear limit: 0.15 mm

Fig 4: Identifying Correct & Incorrect Bearing Cap Position

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Observe central alignment.

-- Before installing camshaft, set bearing caps in place and determine installation position.

Fig 5: Identifying Valve Dimensions

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