BMW 1989-1995 525i Service Manual page 123

CAMSHAFT TIMING CHAIN
117-3
8 1112 1
Fig. 5. 01 bailie cover toeing rernov d.
10. Disconnect the coolant hose from behind the oil filter
housing. See Fig. 6.
Fig. 7. Dnve tensioner rolle' boll b 1119 rernoved .
12. Remove the coolant pump pulley.
13. Remove the reference/speed sensor from its mounting
on the front timing chain cover and set it aside.
,-
8 11120
14. Set the engine to approximate TDC by rotating the en-
gine in the normal operating direction until the cam-
shaft lobes at cylinder no. 1 are facing each other. See
Fig. 8.
NorE -
II may be easier to turn the engme over by first remov-
ing the spa rk plugs.
15. Set the engine to TDC by aligning the "O /T' mark
(O' TDC) on the front vibration damper with the cast
boss on the lower timing chain cover. See Fig. 9.
16. Remove the vibration damper mounting bolts and reo
move the vibration damper and pulley. See Fig. 10.
17. Secure the crankshaft hub to prevent the crankshaft
from turning. Using a 22 mm socket. loosen but do not
remove the crankshaft hub boll.
Fig. 6.
001 " " 1
nose ill
011
i,lIer
!10USlfUJ
rarro w ).
11. Remove the drive belt tensioner roller (upper). See Fig.
7. Then remove the tensioner mounting bolts and re-
move the tensioner assembly.
CAUTlON-
Store the removed dove tens ioner m an upright
"installed" position. The tens ioner is filled with oil
and may leak if stored mcorreclly.
No rE -
The cran kshaft hub center boll
is
tightened
10
a
torque
of 4 10 Nm (300
n-u».
A heavy dUly holding device.
such
as
BMW
soeaet
1 001no.
112
150. should be used
10
hold the crankshaft hub steuone ry while the nul is
loosened. Use
a
heavy dUly 3 '4 -mch dove socket and
breaker bar to break the nul free.
CAMSHAFT TlMfNG CHAIN