To Remove
(Power train removed)
- Drain the engine oil, disconnect the cables to the starter motor, generator and engine oil pressure sensor.
- Remove the oil filler pipe and undo the intake manifold stay.
- Remove the crankcase ventilation pipe with intake manifold and the nuts on the turbocharger (turbo).
- Loosen the bolts on the turbocharger stay slightly and remove the water pipe for the turbocharger from the thermostat housing (turbo).
- Detach the hose for the throttle body preheating and unscrew the thermostat housing cover.
- Disconnect the ignition discharge module electrical connection (turbo) and detach the crankcase ventilation and vacuum hoses from the camshaft cover.
- Remove the cover and ignition cables (B204i) or, alternatively, the ignition discharge module (turbo) and put the module to one side. Remove the spark plugs.
- Remove the camshaft cover. Zero the engine and make sure the camshafts are aligned with their setting markings.
- Remove the chain tensioner.
- Remove the camshaft sprockets and place the chain so that the cylinder head can be removed without problem.
- Remove the cylinder head. Start with the bolts in the timing cover and continue in reverse order to assembly. Use the protective sleeve, part no. 75 19 531, to retrieve the bolts.
- Wipe up any oil that has run out. Make sure that the timing chain dies not obstruct removal and then lift off the cylinder head.
- Remove the protective plate and oil sump. Leave the guide sleeve in the cylinder block. Wipe up any oil that has dripped out.
- Remove the crankshaft pulley. Use the flywheel locking attachment, part no. 83 94 868.
- Remove the water pump and the sleeve with O-rings.
- Remove the belt tensioner, generator and the bolt for the support bearing bracket in the timing cover.
- Remove all the bolts on the timing cover, carefully tap the cover off and remove it.