How to Replace timing chain in cylinder head on VW Polo 9N 1.8 GTI

Special tools

• Camshaft sprocket holding tool – Tool No.3036.
• 1,8 engine: Chain tensioner/camshaft adjuster retaining tool – Tool No.3366.
• 2,0 engine: Chain tensioner/camshaft adjuster retaining tool – Tool No.T10092.

General precautions

• Disconnect battery earth lead.
• Remove spark plugs to ease turning engine.
• Turn engine in normal direction of rotation (unless otherwise stated).
• Observe tightening torques.
• If fitted: Mark position of crankshaft position (CKP) sensor before removal.
• Do NOT turn crankshaft via camshaft or other sprockets.
• Do NOT turn crankshaft or camshaft with timing chain removed.

Valve timing procedures

• Removal/refitting requires:
  • Remove timing belt.
• Engine at TDC on No.1 cylinder [1] or [2] .
• Ensure timing marks on camshaft rear sprockets aligned [3] .
• Remove camshaft front sprocket. Use tool No.3036.
• Fit chain tensioner/camshaft adjuster retaining tool. Tool No.3366 or T10092 [4] or [5] .

  NOTE: DO NOT overtighten chain tensioner/camshaft adjuster retaining tool as damage may occur.

• If reusing timing chain: Mark chain links with paint against timing marks on sprockets [6] & [7] .

  NOTE: Chain link on exhaust camshaft sprocket slighty offset from camshaft sprocket timing mark [6] .

• Ensure camshaft timing marks separated by 16 link rollers, with link rollers 1 and 16 aligned with timing marks as shown [6] & [7] .
• Remove and refit chain tensioner/camshaft adjuster complete with camshafts.
• Tighten chain tensioner/camshaft adjuster bolts. Tightening torque: 10 Nm.

NOTE: Allow 30 minutes after installing camshafts before starting engine to prevent engine damage.