Removing and installing toothed belt - engine code CZCA: Audi A1 (CPTA, CZCA, CZDB, CZEA)

🧭 Before you start

Fits: Audi A1 (8X, 2010–2018)

• Timing position: the crankshaft or camshaft is set and locked during this job
• Special tools named: T10527/1, T10494, T10487, T10172/1, locking pin, torque wrench
• Renewed: o-ring of plug

Don't miss

• Disregard (arrows).
• Disregard (item 2).
• The locking pin T10340 locks the crankshaft only in the direction of engine rotation.
• It should be possible to insert the camshaft clamp T10494 easily.Do not knock camshaft clamp into place with any kind of tool.
• If it is not possible to insert the camshaft clamp T10494 easily:Press down toothed belt (arrow) using assembly tool T10487 and then insert camshaft clamp T10494 into camshafts as far as stop and hand-tighten bolt.

🔧 Engine codes this applies to

🔩 Torque settings

Values can differ between engine variants — check the code stamped on your block.

ℹ️ Always cross-check the exact figure against your vehicle's factory manual before final tightening — a wrong torque can damage the engine. These values are extracted from workshop data and may not cover every variant or revision.

📐 44 workshop diagrams for CPTA

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. Loosen hose clips (1, 2) and remove air pipe.
2. Unplug electrical connector (1) at charge pressure sender G31. [Note: Disregard (arrows).]
3. Move air hoses clear at air pipe.
4. Release fasteners (arrows) with release tool T10527 and T10527/1, and detach air pipe.
5. Press release tabs and disconnect hose (1) for activated charcoal filter.

6. Remove bolts (arrows) and detach crankcase breather hose.
7. Unscrew bolts (arrows) using socket Torx T30T10405 and detach connection (1). [Note: Disregard (item 2).]
8. Move clear electrical wiring harness (arrows).
9. Unscrew bolts (1, 3) and remove cover (2) for toothed belt for coolant pump.
10. Unscrew bolts (arrows) and detach sealing cap (1).
11. Move clear hoses at bracket (3).
12. Remove bolt (2).
13. Release clips (arrows) and detach toothed belt cover (top) (1).
14. Unscrew plug for "“TDC”" hole on cylinder block.
15. Screw locking pin T10340 into cylinder block as far as stop and tighten to 30 Nm. — 30 Nm (22 lb-ft)
16. Rotate crankshaft in normal direction of rotation as far as stop. [Note: The locking pin T10340 locks the crankshaft only in the direction of engine rotation.] [Note: The camshafts have two pairs of grooves: one positioned symmetrically and one positioned asymmetrically. In TDC position, the asymmetrically positioned pair of grooves must be above the imaginary horizontal centre line.]
17. ⚠ Risk of damage to engine.If the locking pin T10340 cannot be screwed in as far as the stop, the crankshaft is not in the correct position.In this case proceed as follows:Remove locking pin.Turn crankshaft by 90° in direction of engine rotation.Screw locking pin T10340 into cylinder block as far as stop and tighten to 30 Nm.Turn crankshaft further in normal direction of rotation as far as stop. — If camshafts are not positioned as described, unscrew locking pin T10340, turn crankshaft one rotation further and return to TDC position. [Note: It should be possible to insert the camshaft clamp T10494 easily.Do not knock camshaft clamp into place with any kind of tool.] — 30 Nm (22 lb-ft)
18. When camshafts are positioned as described, insert camshaft clamp T10494 into camshafts as far as stop and hand-tighten bolt (arrow). [Note: If it is not possible to insert the camshaft clamp T10494 easily:Press down toothed belt (arrow) using assembly tool T10487 and then insert camshaft clamp T10494 into camshafts as far as stop and hand-tighten bolt.]
19. Remove poly-V-belt pulley .
20. Remove bolts (arrows) and detach toothed belt cover (bottom).
21. ⚠ Avoid damage to camshaft.The camshaft clamp T10494 must not be used as a counterhold tool. — Unscrew plug (1) on camshaft sprocket on intake side using counterhold tool T10172 A with adapters T10172/1.
22. Loosen bolts (1, 2) approx. 1 turn using counterhold tool T10172 A with adapters T10172/1.
23. Loosen bolt (1) using insert tool, 13 mm T10500 and release tensioning roller on eccentric adjuster (2) using special wrench, 30 mm T10499.
24. ⚠ If a used belt runs in the opposite direction when it is refitted, this can cause breakage.Before removing, mark direction of rotation of toothed belt with chalk or felt-tip pen for re-installation. — Take off toothed belt.
25. Detach crankshaft sprocket (1)(arrow). [Note: Renew bolts tightened with specified tightening angle.Renew O-ring of plug if damaged.]
26. Check "“TDC”" position of camshaft and crankshaft:
27. ⚠ Avoid damage to camshafts.The camshaft clamp T10494 must not be used as a counterhold tool. — Fit new bolts (1, 2) for camshaft sprockets, but do not tighten.
28. Fit crankshaft sprocket onto crankshaft.
29. Fit toothed belt in the specified sequence.
30. Install toothed belt cover (bottom section).
31. Install poly-V-belt pulley .
32. Using special wrench, 30 mm T10499, turn eccentric adjuster (2) of tensioning roller in direction of (arrow) until adjustment indicator (3) is positioned approx. 10 mm to the right of adjustment window.
33. Turn eccentric adjuster back until adjustment indicator is positioned exactly in adjustment window.
34. ⚠ Risk of damage to engine if tightening torque is incorrect.Torque wrenchVAS 6583 must be used to tighten the bolts.When setting the tightening torque on the torque wrenchVAS 6583, the reading on the insert tool, 13 mm T10500 must be entered in the torque wrench. — Hold eccentric adjuster in this position and tighten bolt (1) using insert tool, 13 mm T10500 with torque wrenchVAS 6583. [Note: Turning the engine further or running the engine may lead to slight differences in the position of the adjustment indicator (3) in relation to the adjustment window. This does not affect the toothed belt tension.]
35. Tighten bolts (1, 2) initially to 50 Nm using counterhold tool T10172 A with adapters T10172/1. — 50 Nm (37 lb-ft)
36. Remove locking pin T10340.
37. Remove bolt (arrow) and detach camshaft clamp T10494.
38. Turn crankshaft 2 rotations in normal direction of engine rotation (arrow).
39. Screw locking pin T10340 into cylinder block as far as stop and tighten to 30 Nm. — 30 Nm (22 lb-ft)
40. Rotate crankshaft further in normal direction of rotation as far as stop. [Note: The locking pin T10340 locks the crankshaft only in the direction of engine rotation.] [Note: It should be possible to insert the camshaft clamp T10494 easily.Do not knock camshaft clamp into place with any kind of tool.]
41. Insert camshaft clamp T10494 into camshafts as far as stop and hand-tighten with bolt (arrow). [Note: If it is not possible to insert the camshaft clamp T10494 easily:Press down toothed belt (arrow) using assembly tool T10487 and then insert camshaft clamp T10494 into camshafts as far as stop and hand-tighten bolt.]
42. Adjust valve timing again .
43. Remove locking pin T10340.
44. Remove bolt (arrow) and detach camshaft clamp T10494.
45. Tighten bolts (1, 2) to final tightening torque using counterhold tool T10172 A with adapters T10172/1.
46. Tighten plug (1) using counterhold tool T10172 A with adapters T10172/1.

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