BMW 3 Series Service Manual (E39)
.pdf170-25
Radiator and Cooling system]
< Disconnect expansion tank:
Remove expansion tank bleed screw and support clip (A)
Loosen hose clamp (6)and disconnect coolant hose from expansion tank.
Disconnect harness connector from coolant level sensor
(C).
Push top of expansion tank toward engine and disconnect bleed hose.
Lift expansion tank to free it from lower mounts, then lift straight up to remove.
-Installation is reverse of removal, noting the following:
Fill radiator and cooling system as described earlier. See Coolant, draining and filling (6-cylinder models) or Coolant, draining and filling (V-8 models).
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Exhaust System
-With exhaust system fully cold, raise and support car for access to exhaust system.
WARNING-
Donot worlc undera liftedcar unlessit issolidlysupportedon jack stands designedfor that purpose. Never work under a car that is supportedsolely by ajack.
-Disconnect oxygen sensor connector(s).
4 Loosen and remove bolts holding front exhaust pipes to exhaust manifolds (arrows). Right side of V8 model shown.
-Support exhaust system
-Where applicable, disconnect exhaust support bracket assembly from transmission.
<Remove hangers by prying off bracket (arrows).
-Lower exhaust system as a single unit to ground.
NOTE-
If the catalytic converterlfront exhaustpipe assemblyis to be replaced, transfer the oxygen sensors to the new pipe(s).
Tightening torque
Oxygen sensor |
55 Nm (41 ft-lb) |
-installation is reverse of removal.
*Make sure there is at least 20 mm (314 in.) clearance between exhaust system and car body at every point.
Loosely install ail exhaust system mounting hardware and hangers before tightening fasteners to their final torque.
Coat manifold studs with copper paste before installing nuts.
NOTE-
Where applicable, tighten front pipe with semi-flexiblecom- pensator last when installing front pipe to manifolds.
Tightening torques |
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Exhaust manifoldsto cylinder head |
22 Nm (17 It-lb) |
Front exhaust pipe to manifolds |
30 Nm (22 ft-lb) |
To prevent exhaust system rattles and vibration, the system should be slightly preloaded by pushingthe rear clamping bracketsforward about 7 mm (114 in).
Exhaust system1
Exhaust manifold removal procedures are organizedaccording to engine code. If necessary, see 100 Engine-General for engine code and application information.
Exhaust manifolds, removingand installing (M52engine)
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-
Donot work undera linedcar unlessitissolidlysupportedon jack stands designedfor that purpose. Never work undera car that is supportedsolelyby ajack.
-Disconnectsecondary air check valve and pipe from exhaust manifold.
-Unbolt front exhaust pipe@)from exhaust rnanifold(s)
-Remove exhaust support bracket from transmission.
-Loosenand remove nuts from exhaust manifolds and remove manifolds. Discard nuts and gaskets.
NOTE-
On cars with oxygen sensors mounted in the exhaust manifolds, 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) |
180-6
Exhaust System
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Exhaust manifolds, removingand installing |
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(M52 TU and M54 engines) |
I Exhaust manifolds with converters |
I 4 The exhaust manifolds incorporate the catalytic converters. |
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Two precatalyst and two post-catalyst oxygen sensors are |
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mounted in the exhaust manifold assembly. |
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Under normal conditions, the catalytic converters do not re- |
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quire replacement unless damaged. Always use new retain- |
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ing nuts and gaskets when removing and installing the |
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exhaust manifolds. |
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4 Using engine support equipment (BMW special tools 00 0 |
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200. 00 0 201. 00 0 202.00 0 204.00 0 208 or equivalent). |
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/I |
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connect to lifting eye on front of engine. Rhise engine approx. |
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5 mm (IHin). |
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With exhaust system cold, raise and support car for access |
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to exhaust system. |
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WARNING- |
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Donot worlc undera liftedcar unlessitis solidlysupportedon |
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jack stands designed for that purpose. Never worlc undera |
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car that is supported solely by ajaclc. |
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in order to avoid damaging oxygen sensors: |
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- Detach oxygen sensor harness connectors, |
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Remove oxygen sensors from exhaust manifolds as de- |
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scribed later in this group. |
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CAU T I O G |
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- -Removing left side exhaust manifolds (cylinder bank 5-8):
030
Install BMW special tools 00 0 200,OO 0 201,OO 0 202,OO 0 204, and 00 0 208 or other suitable engine lifting support above engine and attach to lifting eye on left head.
NOTE-
The supports on special tool 00 0 208 must rest on the screws on the fenders.
-Remove nut at top of engine support on left side
-Raise engine at front suspension lug a maximum of 25 mm ( I .O in).
Release clamping bolt and nut (arrow) and slide universal joint off steering gear.
4 Remove nuts securing left exhaust manifold to head,
Raise front of manifold as high as possible past end position of steering gear and feed out towards bottom.
-Installation is reverse of removal.
Coat exhaust mounting studs with CRC or equivalent copper paste.
Use new exhaust gaskets and self-locking nuts.
Install new self-locking nuts on engine mount and steering shaft bolt.