Oil Pressure Warning Switch. Replacing - BMW 5251 Service Manual

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System
r -
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Working at lower rear of engine, remove oil pan retaining
bolts (arrows).
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If necessary, remove oil cooler bracket from oil pan.
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Remove remaining oil pan bolts. Slide upper section of oil
pan forward to remove.
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Installation is reverse of removal, noting the following:
Clean sealing surfaces of debris.
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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<et retaining nut, using Loctite 8 or equivalent thread
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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) I 2 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)
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In all models, the oil pressure warning switch is located at the
base of the oil filter housing.