BMW 1989-1995 525i Service Manual page 97

CYLINDER HEAD REMOVAL AND INSTALLATION
113-25
4. lightly lubricate new cylinder head bolts. Loosely in-
stall bolts with washers. Thread all bolts in finger tight.
CAUTION-
• Tone-type cylinder head bolts should not be re-
used. They are stretch-type bolts and must al-
ways be replaced whenever loosened.
8. Install intake sprocket (right cylinder head) to timing
chain and camshaft with arrow on sprocket pointing up
and dowel pin for camshaft position sensor in lower left.
See Fig. 54.
• Bolt holes in sprocket should be centered to threaded
bores in camshaft. Tighten sprocket bolts finger tight.
• Do not wash protective coaling Irom new bolts.
5. Tighten cylinder head bolts in stages. alternately and
diagonally in the sequence shown. See Fig. Fig. 53.
00 11 507
9. Adjust camshaft timing and tighten sprocket mounting
bolts as described in 117 Camshaft Timing Chain.
Fig . 54. Intake sprocket correctly altgned to cam shaft With arrow
pointing up (1) and sensor pin in lower left (2).
9
3
1
5
7
• cnec«
that all washers lor the head bolts are in
place belore installing bolts. Some washers may
be staked to the cylinder head.
10
4
2
6
8
00 1l !~
• Install front timing chain cover, using new gaskets and
new O-ring for tensioner oil feed (between cover and
cylinder head).
Fig. 53. Cylinder head bolt lightening sequence (MOO engine).
10. Remove protective film from gaskets. Seal lower cor-
ners of cover to cylinder head. Tighten bolts in two
stages, tightening cover-to-cylinder block bolts first.
WARNING-
The use of
a
special tool (BMW Tool No. 11 2 110)
or
a
suitable protractor is required to tig hten head
bolts to
a
specified torque angle. See Fig . 28. given
earlier.
Tightening Torques
• Cylinder head to cylinder block (M60 engines)
stage 1 30 Nm (22 ft-lb)
stage 2 +80 0
stage 3 +80 0
11. Install camshaft timing chain tensioner.
12. The remainder of installation is the reverse of removal.
noting the following special instructions:
• Use new gaskets when mounting the intake manifold.
Tighten nuts finger tight first, then torque to specifica-
tion in stages working diagonally from inside to outside.
• Refill and bleed cooling system as described in 170
Radiator and Cooling System.
• Change the engine oil and filter as described in 020
Maintenance Program.
6. Install chain guide rail and guide rail mounting bolt.
7. Position camshafts and crankshaft at TOC and lock
shafts in position using BMW special tools. See 117
Camshaft Timing Chain.
CAUTION-
To prevent damaging engine electronic systems.
be sure to install all ground wires previousty reo
moved.
NOTE-
Tightening torques are given on the following page.
REM OVING AND INSTALUNG CYLINDER HEAD