BMW 5251 Service Manual page 343

Lubrication System
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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)