Removing and installing inlet side balance shaft — VW

🧭 Before you start

Fits: platform codes AU1, BX5

• Renewed: idler gear, oil seal for balance shaft

Don't miss

• Mark faces of gear teeth of idler gear with paint (arrow).
• Insert idler gear; marking on balance shaft must be positioned between markings on faces of gear teeth.

🔧 Engine codes this applies to

📐 74 workshop diagrams for BZB

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

📋 Procedure

1. Remove toothed belt for coolant pump .
2. Remove upper timing chain cover .
3. Remove lower timing chain cover .
4. Remove camshaft timing chain .
5. Remove drive chain for balance shafts .

6. Remove bolt (2).
7. Detach drive sprocket (1) for toothed belt for coolant pump.
8. Remove intermediate shaft pulley (1).
9. Unscrew bolt (2) for balance shaft on inlet side and pull out balance shaft.
10. Lubricate bearing points of balance shaft (arrows) with engine oil.
11. Install balance shaft for inlet side and tighten bolt (2).
12. Renew O-ring (1) and lubricate with engine oil.
13. Lubricate bearing mounting with engine oil and install; dowel pin (arrow) for bearing mounting must engage in bore in cylinder block. [Note: It is essential to renew the idler gear. Otherwise, no tooth backlash is set, resulting in engine damage.The new idler gear is coated with a solid film lubricant that wears off after a short period and thus automatically sets the tooth backlash.]
14. Mark faces of gear teeth of idler gear with paint (arrow).
15. Insert idler gear; marking on balance shaft must be positioned between markings on faces of gear teeth.
16. Tighten bolt (1) for idler gear; tightening sequence .
17. Check markings on idler gear and balance shaft (arrow).
18. Install drive chain for balance shafts .
19. Install camshaft timing chain .
20. Install timing chain cover (bottom) .
21. Install timing chain cover (top) .
22. Renew oil seal for balance shaft on inlet side .
23. Fit toothed belt for coolant pump .

Other VW procedures

• Renewing combustion chamber ring seal (teflon ring seal)
• Removing and installing coolant temperature sender G62 – Audi
• Checking fuel delivery rate (engine codes CAWA, CAWB, CBFA, CCTA, CCTB, CGYA, BZB)
• Removing and installing camshaft control valve 1N205 · 1 torque figures
• Checking intake manifold change-over – VW Golf IV / Bora
• Removing engine · 41 torque figures
• Removing and installing camshaft – VW Golf Cabriolet · 47 torque figures
• Adjusting valve timing – VW Passat B5 · 83 torque figures
• Removing and installing camshafts – VW Passat B6 · 39 torque figures
• Removing and installing coolant pump · 53 torque figures