Front Centering Guide. Replacing - BMW 5251 Service Manual

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On installation, drive new center bearing firmly to stop.
Reassemble driveshaft using matchmarks made prior to
disassembly.
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Clean threads and install bolt securing driveshaft halves.
Use thread locking compound LoctiteO or equivalent.
Tightening torque
Driveshaft front half to rear half
(use thread locking compound) 97 Nm (72
fl-lb)
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Install driveshaft as described earlier.
Front centering guide, replacing
The front centering guide centers the driveshafl in relation to
the transmission. The guide is press-fit into a cavity in the
front of the driveshafl and slides onto the transmission output
shaft.
No specifications are given forwear of the guide, but general-
ly the guide should fit snugly on the transmission output shafl.
NOTE-
Some driveshafts have a dust cap installed on the end of the
driveshaft, over the centering guide. The dust cap may be-
come bent or distorted when the driveshaft is removed or in-
stalled. Damage to the dust cap should not affect the
centering guide and should not be mistaken for guide wear.
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Remove driveshafl as described earlier
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Pack cavity behind centering guide with heavy grease until
grease is flush with bottom edge of guide.
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Insert 14 mm (approximately 9/16 in.) diameter mandrel or
metal rod into guide. Strike guide with hammer to force cen-
tering guide out.
NOTE-
Tlie mandrel should fit snugly in the centering guide so that
the grease cannot escape around the sides of the mandrel.
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Remove old grease from driveshaft, lubricate new centering
guide with molybdenum disulfide grease (MolykoteO, Long-
term8 2 or equivalent) and drive it into driveshaft.
4
When installing new driveshafl centering guide, be sure seal-
ing lip of guide faces outward. Drive guide into driveshaft to
a protrusion depth of 4
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6mm (0.16
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0.24 in.).
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Install driveshaft as described earlier.