Service procedures - engine Group 21
58
Refitting
4
Check the polygon hub and its contact face on the crank-
shaft. Any cutting marks are to be removed with fine emery
cloth.
Grease the crankshaft journal with molybdenum disulfide. Fit
the centering section of drift 884995 on the crankshaft jour-
nal.
5
Polygon hub, replacing
(with the timing gear cover removed)
Special tools: 999 3590, 884994, 884995
Removal
1
Block the flywheel.
2
Heat the polygon hub to a temperature of about 100°C
(212°F). Fit the hub using drift 884995.
6
When the hub has cooled off, torque the crankshaft’s cen-
tral screw to 640 Nm (472.3 ft-lb).
7
Place the vibration damper on the polygon hub before fit-
ting the timing gear cover.
Remove the vibration damper.
3
Undo the central screw on the polygon hub. Counter with
tool 999 3590. Pull off the polygon hub with tool 884994.
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