BMW 1989-1995 525i Service Manual page 144

118-4
CAMSHAFT TIMING BELT
4. Using a socket wrench on the center crankshaft bolt.
slowly rotate the engine clockwise through two com-
plete revolutions (720°) until the timing marks are
aligned again. If the marks are not aligned, loosen the
belt tension and repeat the above procedure.
5.
Once the alignment of crankshaft and camshaft timing
marks are correct. first torque the upper and then the
lower tensioner mounting bolts. Tightening to rques are
given below.
NOTE -
Rotating the engine automa tically tensions the belt to
the correct tightness.
The remainder of the installation is the reverse of removal.
When installing the vibration damper. be sure to align the
crankshaft hub locating pin to the hole in the vibration damper.
See Fig. 8.
Fig. 8. Crankshaft hub locating pin
(arrow).
Install the engine V-belts and adjust belt tens ion as de-
scribed in 020 Maintenance Program. Place a label in the
engine compartment noting camshaft drive belt replacement
date and odometer reading. Refill the cooling system as de-
scribed in 170 Radiator and Cooling System.
CAMSHAFT nMING BELT REPLACEMENT (M20 ENGINE)
Tightening Torques
• Cams haft drive belt tensioner
to cylinder block 22
±
2 Nm (16 + 1 ft-Ib)
• Camshaft drive belt covers (upper and lower)
to cylinder block
M6 nuts or bolts 9 to 11 Nm (6.5 to 8 ft-Ib)
M8 nuts or bolts
22
± 2 Nm (16 + 1 ft-Ib)
• Vibration damper to crankshaft hub
M8 bolts 22
±
2 Nm (16
+
1 ft-Ib)
• Camshaft sprocket
to camshaft 65 to 70 Nm (47 to 50 ft-Ib)