BMW 5251 Service Manual page 529

1
Exhaust ~vsteml
NOTE-
The front exhaust manifold must be removed before the rear
manifold.
-
Installation is reverse of removal.
Coat exhaust mounting studs with CRC or equivalent cop-
per paste.
Use new gasltets and self-locking nuts.
Tightening torques
Exhaust manifold to cylinder head 20 Nm
(15
ft-lb)
Front exhaust pipe to manifold 30 Nm
(22
ft-lb)
Oxygen sensor to manifold 50 Nrn (37
ft-lb)
Exhaust manifolds, removing and installing
(M62 engine)
Always use new retaining nuts and gasltets when removing
and installing the exhaust manifolds.
NOTE-
Access to manifolds is extremely limited. I f removing exhaust
manifolds as part of additional engine worlc (such as cylinder
head removal), it may be easier to first remove engine.
-
With exhaust system cold, raise and support car for access
to exhaust system.
WARNING
-
Do not work undera lifted car unless it is solidly supported on
jaclt stands designed for the purpose. Never worlc undera car
that is supportedsolely by a jack.
-
Remove exhaust system. See Exhaust system, removing
and installing.
-
Removing right side exhaust manifolds (cylinder bank 1-4):
Remove heat baffle plate.
Disconnect plug connection to oxygen sensor.
securing exhaust manifolds to head.
Remove manifolds towards bottom.
-
Installation is the reverse of removal.
Coat exhaust mounting studs with CRC or equivalent
copper paste.
Use new gasltets and self-loclting nuts.