BMW 5251 Service Manual page 213

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Cylinder Head and valvetrain]
Turn engine over twice in direction of rotation until cylinder 1
intake and exhaust camshaft lobes (arrows) face each other.
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Lock crankshaft in TDC position with BMW special tool
11 2 300.
4
Place BMW special tool set 11 3 240 over camshafts and
measure clearances.
NOTE-
@
If the exhaust side of the tool (A) is not flush with the head,
camshaft timing is incorrect. Reset camshaft timing as de-
scribed in 11 7 Camshaft Timing Chain.
Due to flexible sprocket design, VANOS unit tolerances
and play in the VANOS splines, when the camshaft timing
is set correctly, the intake side of special tool set 11
3
240
(B) may be up to 1 mm (0.04 in.) above the suiface of the
cylinder head. This is normal. Reassemble engine. Other-
wise, reset camshaft timing as describedin 1 l?Camshaft
Timing Chain.
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Remove BMW special tool 11 6 150 from front of cylinder
head.
4
Clean contact edges of cylinder head face and VANOS unit
and apply a thin coat of Three Bond 12090 or equivalent
sealing compound to surfaces.
CAUTION-
Male sure all gasket material is removed from face of cyl-
inder head. Clean sealing face and keep free of oil.
Check locating dowel (A) and dowel sleeve (B) at top
of cylinder head for damage or incorrect installation.
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Using a new steel gasket, install VANOS unit to front of cyi-
inder head. See 117 Camshaft Timing Chain.
NOTE-
If VANOS control unit is being replaced, be sure to check and
adjust camshaft timing as described in 117 Camshaft Tim-
ing Chain.
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Reinstall engine lifting eye.
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Reconnect electrical harness connectors to camshaft posi-
tion sensors and VANOS solenoid valves.