BMW 5251 Service Manual page 117

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Cylinder Head Removal and Installation
1
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Remove complete air filter housing assembly with mass air
flow sensor:
Loosen intalte duct hose clamp (A) at throttle assembly.
Loosen clamp and remove idle control line from intake duct
(B)
and disconnect idle speed control valve electrical har-
ness connector.
Disconnect electrical harness connector (C) from mass air
flow sensor.
Remove air filter housing mounting screw (D).
Disconnect vent tube (E).
.
Loosen air intalte duct clamp (F).
Carefully lifl air filter housing, mass air flow sensor, and in-
take duct hose out of engine bay.
4
Disconnect positive battery cable and remove intake rnani-
fold cover:
Remove protective cover from positive (+)jumper post.
Loosen and remove battery lead mounting nut (A).
Remove lead and push down through intake manifold.
* Remove trim covers (arrows) from fuel injector cover.
Remove cover hold down fasteners and lifl off cover.
4
Worlting above engine, disconnect the following:
Vent line from cylinder head cover. To remove, pinch clips
(arrows).
Electrical harness connector from VANOS solenoid valve
(A).
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Remove oxygen sensors and exhaust manifolds. See 180
Exhaust System.
CAUTION-
Remove oxygen sensors before removing exhaust mani-
fold to prevent damage.
Label oxygen sensor harness connectors so that they
can be reassembled correctly Do not interchange con-
nectors.
NOTE-
Front exhaust manifold must be removed before rear
manifold.