How to replace timing chain on Vauxhall/Opel Agila A 1.2 Twinsport

Special tools

• Camshaft locking tool – No.KM-953.
• Camshaft position (CMP) sensor disc setting tool – No.KM-954.
• Crankshaft locking pin – No.KM-952.
• Timing chain tensioner locking pin – No.KM-955-1.

General precautions

• Disconnect battery earth lead.
• Remove spark plugs to ease turning engine.
• Turn engine in normal direction of rotation (unless otherwise stated).
• DO NOT use special tools listed above to lock engine when slackening sprocket or pulley bolts.
• 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

• Turn crankshaft until just before TDC mark on No.1 cylinder [1] .
• Remove blanking plug from cylinder block.
• Slowly turn crankshaft clockwise until locking pin can be inserted in crankshaft [2] . Tool No.KM-952.
• Insert locking tool in rear of camshafts [3] . Tool No.KM-953.
• Install camshaft position (CMP) sensor disc setting tool [4] . Tool No.KM-954.
• Remove blanking plug from timing chain front cover [5] .
• Compress timing chain tensioner and lock with tool [6] . Tool No.KM-955-1.
• If necessary, slacken bolt of each camshaft sprocket to adjust valve timing position [7] .
• Fit new bolts to camshaft sprockets [7] .
• Tighten bolt of each camshaft sprocket as follows [7] :
  • Stage 1 – 10 Nm.
  • Stage 2 – 50 Nm + 60°.
• Tighten crankshaft pulley bolts to 8 Nm [8] .
• Fit new crankshaft pulley centre bolt.
• Tighten crankshaft pulley centre bolt [9] . Tightening torque: 150 Nm + 45°.
• Refit blanking plug for cylinder block. Tightening torque: 50 Nm.
• Refit blanking plug for timing chain front cover [5] . Tightening torque: 50 Nm.