Camshaft Timing Chains Overview

Fig 1: Engine, Disassembling And Assembling Part I

Courtesy of AUDI OF AMERICA, LLC

1. Control Housing
   • Removing and Installing, refer to CAMSHAFTS, REMOVING AND INSTALLING .
   • Disassembling and Assembling, refer to Figure.
   • Check screen for dirt, refer to Figure.
   • Lightly lubricate contact surfaces of seals before Installation.
2. Bolt
   • 8 Nm
   • Replace
3. Camshaft Timing Chain
   • before Removal, mark direction of rotation with paint, refer to Fig 2.
   • Remove from the camshafts, refer to CAMSHAFT TIMING CHAIN, REMOVAL FROM CAMSHAFTS .
   • Removing and Installing, refer to CAMSHAFT TIMING CHAIN, REMOVING AND INSTALLING .
4. Camshaft Adjuster, Exhaust Side
   • Identification: "32A"
   • Removing and Installing, refer to CAMSHAFT TIMING CHAIN, REMOVAL FROM CAMSHAFTS .
5. O-Ring
   • Replace
6. Oil Pump
   • Removing and Installing, refer to OIL PUMP, REMOVING AND INSTALLING .
7. Bolt
   • Tightening specification, refer to OIL PUMP OVERVIEW .
8. Timing Chain Tensioning Rail
   • remove to remove and install timing chain upper and lower covers.
9. Camshaft Timing Chain Tensioner
   • 50 Nm
   • Removing and Installing, refer to CAMSHAFT TIMING CHAIN, REMOVAL FROM CAMSHAFTS .
   • Only rotate engine with chain tensioner installed.
10. Seal
    • Replace if damaged or leaking.
11. Mounting Pin
    • 18 Nm
    • Without collar
    • For tensioning rail -item 8-.
12. Timing Mechanism Drive Chain Sprocket
    • Removing and Installing, refer to TIMING MECHANISM DRIVE CHAIN, REMOVING AND INSTALLING .
13. Camshaft Timing Chain Sprocket
    • Removing and Installing, refer to TIMING MECHANISM DRIVE CHAIN, REMOVING AND INSTALLING .
14. Bolt
    • 60 Nm + 90° (¹ /₄ ) turn.
    • Replace
    • Use Counterhold - Vibration DamperT10069 on vibration damper to loosen and tighten.
15. Chain Tensioner with Tensioning Rail
    • For drive chain.
    • Before installation release the locking device in the chain tensioner with a small screwdriver and press the tensioning plate against the chain tensioner.
    • Only rotate engine with chain tensioner installed.
16. Drive Chain Sprocket
    • Integral part of crankshaft.
    • Ground down tooth faces in "TDC" position toward bearing joint.
17. Power Take-Off Drive Chain
    • Before Removal, mark direction of rotation with paint, refer to Fig 2.
    • Removing and Installing, refer to TIMING MECHANISM DRIVE CHAIN, REMOVING AND INSTALLING .
18. Timing Mechanism Drive Chain Guide Rail
19. Mounting Pin
    • 10 Nm
    • Without collar
    • For guide rail -item 18-.
20. Mounting Pin
    • 10 Nm
    • With collar
    • For guide rail -item 23-.
21. Bolt
    • 23 Nm
22. Bolt
    • 60 Nm + 90° (¹ /₄ ) turn.
    • Replace
    • To loosen and tighten, counterhold with a wrench at the camshaft wrench surface, refer to CAMSHAFT TIMING CHAIN, REMOVAL FROM CAMSHAFTS .
    • Contact surface of sensor wheel at screw head must be dry when Installation.
23. Camshaft Timing Chain Guide Rail
    • Removing and Installing, refer to CAMSHAFT TIMING CHAIN, REMOVAL FROM CAMSHAFTS .
24. High Pressure Pump Drive Chain Sprocket
    • Different versions
    • On the version for vehicles without the mechanical vacuum pump, lightly lubricate the needle bearing side before Installation.
25. Camshaft Adjuster, Intake Side
    • Identification: "24E"
    • Removing and Installing, refer to CAMSHAFT TIMING CHAIN, REMOVAL FROM CAMSHAFTS .
26. Exhaust Camshaft Adjustment Valve 1 -N318-
    • For the exhaust camshaft.
    • Mark the electrical connector before disconnecting.
27. Camshaft Adjustment Valve 1 -N205-
    • For the intake camshaft.
    • Mark the electrical connector before disconnecting.
28. Camshaft Timing Chain Guide Rail
    • Clipped in at control housing.

Fig 2: Identifying Marks On Roller Chains

Courtesy of AUDI OF AMERICA, LLC

-- Mark timing chain running direction with arrows using paint -arrows- for reinstallation.