BMW 5251 Service Manual page 153

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Cylinder Head Removal and Installation
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Disconnect the following electrical harness connectors:
Knock sensors (A).
Thermostat (6).
Throttle position sensor and idle valve (C).
Camshaft position sensor (D).
Ignition coils (E).
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Remove mounting nuts (arrows) from wiring harness ducts.
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Release fuel injector connectors by releasing spring clip
(arrow) on each injector.
Lift up and remove electrical ducts and set to one side