1998 BMW 540i Ac system

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1 19-1 7
Lubrication System
Disconnect electrical harness connect01
sensor.
. (arrow)
4 Remove lower oil pan bolts (arrows) and pan, oil
level
CAUTION-
If the lowerpan does not separate easily from upperpan, a
few taps with a rubber mallet should break it free. Do not pry
the oil pan loose.
Remove
NC drive belt tensioner.
Remove adjustment bolt
(B).
Remove retaining bolt (A) and remove tensioner from oil
pan.
- Remove power steering pump from engine block, leaving hy-
draulic lines connected. Suspend from chassis using stiff
wire. See
320 Steering and Wheel Alignment.

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119-18
I Lubrication System
4 Working at lefl side of engine, remove oil dipstick guide tube 1 mounting bracket and remove dipstick tube.
NOTE-
Replace dipstick O-ring seal.
< Working at right side of engine, remove oil return line from
upper section of oil pan.
4 Separate lower steering column from steering box:
Remove retaining bolt
(arrow) from lower steering column
universal joint.
Slide lower steering column up and off of connection at
steering box.
- Remove support bracket for hydraulic line at subframe.

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Lubr~cat~on System r- -
Working at lower rear of engine, remove oil pan retaining
bolts
(arrows).
- If necessary, remove oil cooler bracket from oil pan.
- Remove remaining oil pan bolts. Slide upper section of oil
pan forward to remove.
- Installation is reverse of removal, noting the following:
Clean sealing surfaces of debris.
- Coat joints with Three Bond 1209 O sealant.
Use new gaskets.
Install all oil pan bolts first, installing bolts at transmission
end without preload.
Tighten oil pan bolts at front end, then tighten bolts at rear
of engine.
Be sure to reinstall all oil
pump fasteners, including the
sprocl - After adding engine oil, start and run engine. Raise engine
speed to
2,500 rpm until oil pressure warning light goes out
(about
5 seconds).
Tightening torques
AIC drive belt tensloner
M6 10 Nm (7.5 it-lb)
M8 24 Nm (18 ft-lb)
Front axle
subframe to chassis
(Use new fasteners) 77 Nm (57 ft-lb)
Oil drain
line to upper oil pan 30 Nm (22 ft-lb)
Oil pump to crankcase 34 Nm (25 ft-lb)
Oil pan fasteners
(upperllower)
M6 8.8 10 Nm (7.5 ft-lb)
M6 10.9 (replace)
I2 Nm (9 ft-lb)
M8 8.8 22 Nm (16 ft-lb)
Steering column universal joint to
steering box (replace) 19 Nm (14 ft-lb)
Oil pressure warning switch, replacing
(&cylinder and V-8)
- In all models, the oil pressure warning switch is located at the
base of the oil filter housing.

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/Lubrication System
Oil pump, removing and installing
(&cylinder)
Oil pump assembly
(6-cylinder from 9/98)
CAUTIOI\C
Oil pump sproclcet nut has left-hand threads. Turn clockwise
to loosen.
4 Version 1, M52 oil pump assembly.
1. Oil pump pressure relief control valve
2. Oil pump suction tube
3. Suction tube support bracket
4. Oil pump assembly
5. Oil pump drive sprocltet
6. Oil pump drive chain
7. Oil pump drive sprocket nut (left hand threads)
4 Version 2, M52 TU oil pump assembly.
1. Oil pump pressure relief control valve assembly
2. Oil pump suction pick-up and seal
3. Oil pump
4. Oil pump drive sprocket
5. Oil pump shaft locking nut (left-hand thread)
6. Oil pump drive chain
Version
3, M54 oil pump assembly,
1. Drive chain
2.
MlO x 1 nut
Tighten to 25 Nm (18 ft-lb)
3. Oil pump sprocket
4. Inner pump rotor
5. Outer pump rotor
6. Oil pressure relief valve assembly
7. M8 bolt.
Tighten to 23 Nm
(17 it-lb)
8. Oil pump housing
9. Locating dowels
10. Pickup tube sealing O-ring
11. Pickup tube
12. M6 pickup tube mounting bolts
Tighten to
10 Nm (89 in-lb)

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Lubrication System
- Lower front suspension and remove oil pan, as described
earlier, to gain access to oil pump.
Remove oil pump
sprocket mounting nut (left-hand thread)
(arrow). Lift sprocket off together with drive chain.
Engines produced to 9/98: Remove oil pump with pick-up
tube. Pick-up tube is bolted to side of oil pump.
Engines produced from 9/98 to 01/00: Remove pick-up
tube, scraper tray and oil pump as a unit.
Engines produced from 01/00: Remove oil pump pick-up
tube bolts and remove pick-up tube before removing pump.
Remove mounting bolts from oil pump. Withdraw pump.
NOTE-
Record location of any spacers between pump and engine
bloclc Note positions of locating dowels.
- Remove cover from oil pump and check for wear or scoring.
Spin oil pump shaft and
check that gears turn smoothly. Re-
place pump if gears spin with difficulty
orany wear is present.
- Inspect oil pressure relief valve as described later.
- Installation is reverse of removal, noting the following:
Replace pick-up tube O-ring (if applicable).
- Align sprocket splines to oil pump shaft spl~nes before
tightening sprocket nut.
- After adding engine oil, start and run engine. Raise engine
speed to 2,500 rpm until oil pressure warning light goes out
(about 5 seconds).
Tightening torques Oil drain plug to oil pan 25
Nm (18 ft-lb)
Oil pan to engine
bloclc
M6 (8.8 grade)
M6 (10.9 grade)
M8 (8.8 grade)
10 Nm (89 in-lb)
12
Nrn (9 ft-lb)
22 Nm (16 ft-lb)
Oil pump sprocket to oil pump shait
(M10 x 1) (left hand thread)
25 Nm (1 8 it-lb)
Oil pump to crankcase (ME) 22 Nm (1 6 it-lb)
Oil pump pickup tube to cranltcase (M6) 10 Nm (89 in-lb)

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11 9-24
Lubrication System
Oil pump, removing and installing (V-8)
CAUTION-
V8 engines: The oil pump fasteners (including the sprocket
retaining nut) are known to vibrate loose. This can result in oil
starvation and engine failure. Be sure to
checlc oil bolts and
nut tighness whenever the oil pump is accessible. If any fas-
teners are found to be loose, remove them and reinstall with
Loctite
8 and torque to specifications.
- Remove upper oil pan, as described earlier, to gain access to
oil pump.
4 If fitted, remove oil pump sprocket cover fasteners (arrows).
Remove cover.
* Unclip oil return line (A).
4 Remove oil pump sprocket nut (arrow) and sprocket together
with drive chain.
Unbolt oil pump mounting fasteners (arrows) and remove
pump.
Remove oil pressure relief valve and inspect as described
later.

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Lubrication System
4 Replace O-ring seals (arrows) on engine oil pipes. Oil seals
lightly.
CAUTIO&
During reinstallation, do not damage O-rings on sharp edges
of engine
blocl<.
4 Replace sealing O-ring (A) in oil pump.
Turn threaded spacer on pump fully to stop
(arrow).
Reinstall pump. Coat pump mounting fasteners (arrows)
with Loctite 8 or equivalent thread locking product. Install
and tighten.
Coat pump sprocltet shafl threads with Loctite
8. Reinstall
pump sprocltet with drive chain and tighten mounting nut.
Tightening torques
Oil pump cover to oil pump (M6) 10 Nm (89 in-lb)
Oil pump sprocket to shaft
(M10) 45 Nm (33 ft-lb)
Oil pump to engine block
M8 (8.8 grade) 22 Nm (16 ft-lb)

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11 9-26
/Lubrication System
< Use Allen wrench to adjust chain slaclc (B) by turning thread-
ed spacer
(A).
Oil pump chain adjustment
Slack
10 52 mrn (0.394i0.079 in)
- Coat remaining oil pump mounting fastener with Loctite 03. In-
stall and tighten.
- Remainder of assembly is reverse of disassembly.
- After adding engine oil, start and run engine. Raise engine
speed to
2,500 rpm until oil pressure warning light goes out
(about
5 seconds).
Tightening torques
Lower oil pan to upper oil pan
M6 (8.8 grade) 10
Nm (89 in-ib)
M6 (10.9 grade) 12
Nm (9 ft-lb)
M8 (8.8 grade) 22
Nrn (1 6 ft-lb)
Oil drain plug to oil pan (M12) 25 Nm (I8 ft-lb)
Oil pump cover to oil pump
(M6) 10 Nrn (89 in-lb)
Oilpump sprocket to shaft TKO) 45 Nm (33 it-lb)
Oil pump to engine bloclc
M8 (8.8 grade) 22 Nrn (16 ft-lb)
Oil pressure relief valve (&cylinder)
Remove oil
pump as described earlier. The oil pump pressure
relief valve is held in the side of the
oil pump with a circlip.
< Inspect oil pump relief valve components and bore for scor-
4. Sleeve
5. Circlip
- Install using a new circlip.
Oil
pressure relief valve assembly
,- ..., !~. -.-~. - ~- -~!~~-% h. .- .,, /to-cy~~noer engrnej ing or other damage.
1. Control plunger
2. Spring
3. Sealing O-ring