Installing timing chain: VW 1.2 (CBZA, CBZB)

🧭 Before you start

Fits: platform code AJ5

• Timing position: the crankshaft or camshaft is set and locked during this job

Don't miss

• Securing bolt is not tightened by a 1/4 turn (90°) further until after timings have been checked at end of procedure.
• Turn crankshaft 2 revolutions in normal direction of rotation.

🔧 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.

📐 50 workshop diagrams for CBZA

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

📋 Procedure

1. Place timing chain (1) onto front ring gear (2) from underneath and guide timing chain upwards between guide rail and tensioning plate.
2. Prevent timing chain from falling down, e.g. using a screwdriver (3).
3. Place timing chain (1) onto chain sprocket (2).
4. Tighten new securing bolt for camshaft sprocket only hand-tight.
5. Tighten chain tensioner (arrow) to 60 Nm. — 60 Nm (44 lb-ft)

6. Tighten bolt (1) to 50 Nm. [Note: Securing bolt is not tightened by a 1/4 turn (90°) further until after timings have been checked at end of procedure.] — 50 Nm (37 lb-ft)
7. When doing this, hold camshaft toothed belt pulley with counter-hold tool T10172.
8. Remove locking pin T10414 from camshaft.
9. Unscrew locking pin T10340 from cylinder block.
10. Turn crankshaft 2 revolutions in normal direction of rotation.
11. Check valve timing
12. Install valve timing housing (bottom) .
13. Put cover (1) onto oil pump.
14. Install sump .
15. Install crankshaft pulley .
16. Install poly V-belt .
17. Install valve timing housing (top) .
18. Fill coolant system with coolant .

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