BMW 3 (E46). Manual — part 74
119-3
Component
Replacement
Oil pressure warning switch
The pressure warning switch is located
under the intake manifold, in the rear of
the oil filter housing.
Note:
Switch removal may require intake
manifold removal.
Tightening torque
Oil pressure switch
to oil filter housing
27 Nm (20 ft-lb)
Oil level warning switch
The oil level warning switch is located
at the bottom of the engine oil pan.
Note:
Anytime the oil level warning switch is
removed, be sure to replace the sealing
O-ring between switch and oil pan.
Oil pump, removing and
installing
Note:
Oil pump removal requires lowering the
front suspension subframe to remove
the oil pan.
-
Drain oil as described in
020
Maintenance
.
-
Remove oil pan as described
earlier.
Remove oil pump sprocket mounting
nut (left-hand thread) (arrow). Lift
sprocket off together with drive chain.
Remove mounting bolts from oil pump
(7) and oil pump pickup tube (12).
Withdraw pump.
1 - Drive chain
2 - Nut M10x1left-hand thread
-tighten to 25 Nm (18 ft-lb)
3 - Oil pump sprocket
4 - Inner rotor
5 - Outer rotor
6 - Oil pressure relief valve assembly
7 - Bolt M8 -tighten to 22 Nm (16 ft-lb)
8 - Oil pump housing
9 - Locating dowels
10 - Sealing O-ring
11 - Oil pick-up pipe
12 - Bolt M6 -tighten to 10 Nm (89
in-lb)
-
On engines with integrated oil
pump and oil scraper: Remove oil
pump with scraper.
-
On engines with separate oil
pump and scraper:
First remove mounting bolts and
withdraw oil pump intake pipe.
Remove oil pump mounting bolts.
Remove oil pump assembly.
Note:
Note any spacers between pump
and engine block.
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. Replace pump if
gears spin with difficulty or any
wear is present.
-
Installation is reverse of removal,
noting the following:
Align sprocket splines to oil pump
shaft splines before tightening
sprocket nut.
Tightening torques
Oil drain plug to oil
25 Nm (18 ft-lb)
Tightening torques
pan (M12)
Oil pan to engine block
M6, 8.8 grade
10 Nm (89 in-lb)
M6, 10.9 grade
12 Nm (106
in-lb)
M8, 8.8 grade
22 Nm (16 ft-lb)
Oil pump to engine
block (M8)
22 Nm (16 ft-lb)
Oil pump sprocket to oil pump shaft
M10x1 left-hand
thread
25 Nm (18 ft-lb)
Transmission bellhousing to oil pan
M8 Allen
24 Nm (17 ft-lb)
M8 Torx
21 Nm (15 ft-lb)
Oil pump pressure relief valve
The oil pump pressure relief valve is
held in the side of the oil pump with a
circlip.
1 - Control plunger
2 - Spring
3 - Sealing O-ring
4 - Sleeve
5 - Circlip
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