BMW 5251 Service Manual page 109

Cylinder Head Removal and Installation
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Use a spanner tool to rotate exhaust sprocket until stop on in-
take sprocket is contacted.
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Slide VANOS control unit forward to remove
Remove primary chain tensioner (arrow)
WARNING
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Remove tensioner slowly
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it is under spring pressure.
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Working at the intake side of cylinder 1 :
Detach electrical harness connector for camshaft position
sensor and remove sensor.
Detach electrical harness connector for coolant tempera-
ture sensor.
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Remove exhaust manifolds. D~scard nuts. See 180 Exhaust
System.
Disconnect heating system hoses (arrows) from back of cyl-
inder head.