Cylinder Head, Installing, M52 Tu And M54 Engine - BMW 5251 Service Manual

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Cylinder Head Removal and Installation
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Remove bolts (arrows) holding timing chain cover to cylinder
head. (Photo shows camshafts and camshaft bearing caps in
place).
4
Using BMW special tool 11 2 250 or equivalent, loosen cylin-
der head bolts in several stages, in sequence shown. Discard
head bolts.
NOJE-
BMW special tool 11
2
250 is a thin-walled Torx E l 2 socket
with an extended reach. The cylinder head bolts are re-
cessed into the head below the camshaft towers with little
working space.
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Lift off cylinder head. Refer to 116 Cylinder Head and Val-
vetrain for cylinder head reconditioning information.
Cylinder head, installing, M52 TU and M54
engines
Clean cylinder head and gasket surfaces of cylinder bloclc
and all timing chain covers.
CAUTION-
Remove foreign matter and liquid from bolt holes. Trapped oil
or coolant in bolt holes can cause damage to blocl~,
CAUJION-
Do not use a metal scraper or wire brush to clean the alumi-
num cylinder head or pistons. If necessary, use a hard wood-
en orplastic scraper. Also available are abrasive discs to be
used in conjunction with an electric drill. Be sure to use the
correct disc for the type of metal being cleaned.
Evaluate cylinder head as shown in 116 Cylinder Head and
Valvetrain.
NOTE-
If the cylinder head has been machined, a special 0.3 mm
(0.01 1 in.) thicker gasket should be installed. The thicker
gasket is available from an authorized BMW dealer and
should be marked accordingly
Cylinder head and valve specifications are covered in 116
Cylinder Head and Valvetrain.