BMW 1989-1995 525i Service Manual page 134

117-14
CAMSHAFT TIMING CHAIN
13. Apply a light coat of sealer to the two upper camshaft
timing chain cover gaskets. Set the gaskets into position
on the cover. Apply a sealer (Three Bond Silicon 1207.
or equivalent) to each corner of the cylinder head/upper
timing chain cover surface area. See Fig. 31.
Fig . 31. Apply s ater (arro w s) to corners be are installing c hain cover.
14. Apply a light coat of engine oil to the lip of the camshaft
oil seal in the upper liming chain cover. Install the cover
and hand·tighten the mounting bolts. Tighten the bolts
in stages.
NOTE -
Upper timing chain cover mounting bolts vary in size.
See Fig. 29 for correct bolt orientation.
Tightening Torque
• Front timing chain cover to cylinder head
and lower timing chain cover 10 Nm (89 in-Ib)
15. Install the cylinder head cover.
Tightening Torque
• Cylinder head cover
to cylinder head 10 Nm (89 in-Ib)
16. Install the coolant pump pulley.
17. Install all engine drive belts. See 020 Maintenance
Program .
CAMSHAFT TIMING CHAIN
18. Install the radiator fan. fan shroud. thermostat housing.
and refill the cooling system. See 170 Radiator and
Cooling System.
19. Install the ignition components . Use a thread-locking
compound on the ignition rotor adaptor bolt.
Tightening Torque
• Ignition rotor adaptor to camshaft (install with
thread locking compound) . . . 23
±
1 Nm (17
±
1 tt-lb)
20. Reconnect the battery. Check all fluid levels.
To check and adjust camshaft timing
(M60 engine)
Special BMW service tools are needed tor this procedure.
Read the procedure through before beginning the job. II the
camshafts are not properly timed. the pistons can contact the
valves.
1. Disconnect negative (-) battery cable.
CAUTtON -
Disconnecting the battery cables may erase faull
codes stored
111
controt unit memory.
2. Remove radiator cooling tan and fan shroud. See 170
Radiator and Cooling System.
NOTE -
The radiator cooling fan nut (32
mm
wrench) has left-
hand threads.
3. Remove spark plugs. See 020 Maintenance Program.
4. Remove cylinder head covers from left and right cylin -
der heads. See 116 Cylinder Head and Valvetraln.
5. Remove camshaft oil pipes from top of left and right cyl-
inder heads. See Fig. 32.
6. Remove timing chain tensioner from side of right timing
chain cover. Install in its place BMW special tool no. 11
3 390. Thread special tool in until no slack is present in
chain. tightening to 1.3 Nm or 12 in-lb.
NOTE-
• BMW special tool no.
11 3
390
is a
dummy primary
chain tensioner and simulates the function of the hy-
draulic tensioner.
• Assume left fright
otientetion
as
sitting in driver's seat.