BMW 5251 Service Manual page 115

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Cylinder Head Removal and lnstallation
NOTE-
B e Sure the secondary timing chain tensioner is locked down
and the exhaust camshaif mounting bolts are loose before
proceeding.
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Install VANOS control unit. See VANOS control unit, install-
ing (M52 engine) in 117 Camshaft Timing Chain.
CAUTION--
Incorrect installation ofthe VANOS control may result in dam-
age to the engine valvefrain.
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Install exhaust manifolds using new gaskets and nuts. Coat
manifold studs with copper paste prior to installing nuts.
Install intake camshaft cover and cylinder head cover.
Check for correct seating of half-moon seals (A) in back of
cylinder head cover.
Use a small amount of Three Bond 1209 O or equivalent
sealant at corners (6) of half-moon cutouts.
Seat gasket and seal corners in front of cylinder head at
VANOS unit.
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Installation of remaining parts is reverse of removal, noting
the following:
Reinstall electrical harness connectors for oil pressure
switch and coolant temperature sensor before installing in-
take manifold.
Refill cooling system as described in 170 Radiator and
Cooling System.
Change engine oil and filter as described in 020 Mainte-
nance.
If necessary, adjust accelerator cable.
Reconnect battery last.
Tightening Torques
VANOS oil line
32 Nm (24 ft-lb)
VANOS solenoid to control unit
30
Nm (22 ft-lb)
Coolant drain plug to cylinder block
25 Nm
(18
ft-lb)
Cylinder head cover to cylinder head
10
Nrn
(89
in-lb)
(M6
bolts)
intake manifold to cylinder head
15
Nm ( I
1
ft-lb)
Radiator cooling fan to coolant pump
40
Nm (30 ft-lb)
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. .
Radiator drain screw to radiator
2.5
Nm (22
in-lbl