BMW 5251 Service Manual page 105

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Cylinder Head Removal and Installation
1
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Remove intake throttle valve and ASC throttle assemblies:
Disconnect ASC throttle cable (A).
-
Remove ASC throttle housing mounting fasteners
(B).
NOTE-
It i s not necessary to disconnect coolant hoses (C)
01
bowden cables (D).
Remove intake throttle housing mounting hardware, pull
throttle housing off intake manifold, and set aside.
-
Working under intake manifold, disconnect the following:
Engine oil dipstick tube support.
Oil separator return line from dipstick tube.
Intake air temperature sensor electrical harness connector
(underside of intake manifold near throttle body).
* Fuel tank vent line and electrical harness at canister vent
valve.
Remove lower intake manifold supports (arrows).
-
Disconnect coolant line retaining bracket at cylinder block.
4
Remove manifold mounting hardware (arrows).
-
Remove intake manifold from cylinder head while carefully
checking for electrical connections or hoses.
NOTE-
Fuel rail is removed with intake manifold,
CAUTIOI\C
Stuff clean rags into open intake ports to prevent any parts
from falling into Nie engine intake.
-
Drain cooling system (engine block and radiator), then re-
move radiator cooling fan and fan shroud. See 170 Radiator
and Cooling System.
-
Disconnect coolant hoses from thermostat housing.