Special tools
- Camshaft sprocket holding tool 1 – No.KM-6347.
- Camshaft sprocket holding tool 2 – No.KM-956-1.
- Camshaft locking tool(s) – No.EN-46781.
- Tensioner locking tool – No.KM-955.
- Crankshaft pulley hub holder – No.KM-662-C.
- Crankshaft locking pin – No.EN-46785.
General precautions
- Disconnect battery earth lead.
- Remove glow 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/installation of timing chain requires:
- Sump removal.
- Remove blanking plugs from camshaft housing [1] .
- Install camshaft locking tools [2] .
- Flat sections on camshaft locking tools must be in horizontal position [3] .
NOTE: Mark position of flat sections on camshaft locking tools with paint before installation [4] .
- Turn crankshaft in direction of rotation until both camshaft locking tools are heard to engage.
- Install crankshaft locking pin in bell housing hole [5] .
- Install tensioner locking tool before carrying out engine repairs [6] .
- Tighten crankshaft pulley hub bolt [7] . Tightening torque:
- A = Agila/Agila-B/Astra-H/Meriva: 230 Nm.
- B = Corsa-C/Combo-C/Corsa-D/Tigra-B: 50 Nm + 90°. Use new bolt.
NOTE: Crankshaft pulley hub bolt has LH thread.