Exhaust Manifolds, Removing And Installing (M52 Engine) - BMW 5251 Service Manual

Exhaust
system1
Exhaust manifold removal procedures are organized accord-
ing to engine code. If necessary, see 100 Engine-General
for engine code and application information.
Exhaust manifolds, removing and installing
(M52 engine)
4
Exhaust manifolds for the M52 engine.
Always use new retaining nuts and gaskets when removing
and installing the exhaust manifolds.
-
With exhaust system cold, raise and support car for access
to exhaust system.
WARNING
-
Do not work under a lined car unless it is solidly supported on
jack stands designed for that purpose. Never work under a
car that is supported solely by a jack.
-
Disconnect secondary air check valve and pipe from exhaust
manifold.
-
Unbolt front exhaust pipe@) from exhaust rnanifold(s)
-
Remove exhaust support bracket from transmission.
-
Loosen and remove nuts from exhaust manifolds and remove
manifolds. Discard nuts and gaskets.
NOTE-
On cars with oxygen sensors mounted in the exhaust mani-
folds, use care when removing manifolds. To be safe, remove
the sensors from the manifolds before removing manifolds.
-
Installation is reverse of removal
Coat exhaust manifold mounting studs with copper paste
before installing new nuts.
Install manifold gaskets with arched side facing manifolds.
Tightening
torque
Exhaust manifolds
to
cylinder head
20
Nm
(15 ft-lb)