Saab SONETT III Service Manual page 55

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Disassembling the alternator to exchange the bearing
1. Hold the belt pulley securely in a suitable tool and un-
screw the nut with a 7/8" (22 mm) wrench. Remove
the pulley and fan disc.
2. Mark the position of the tension lug on the drive bear-
ing housing. Undo the bearing housing retaining screws
and withdraw the rotor together with the bearing hous-
ing from the stator.
3. Place the drive bearing housing on a suitable backing
surface and carefully press out the rotor. The bearing
can then be removed. Take care that the rotor does
not fall to the floor and suffer damage when it comes
free of the bearing housing.
4. Use a suitable puller to remove the ball bearing from
the slip ring side.
Assembling the alternator
The length of the brushes must be checked before the
alternator is assembled. The minimum is 0.354 in. (9 mm),
but if they are under 0.551 in. (14 mm) they should be
replaced. See section on "Changing brushes".
1. Pack the ball bearings with Bosch Ft 1 v 34 grease.
Press the ball bearing into the housing with the en-
closed side facing the drive end.
2. Press the drive bearing housing on to the rotor.
3. Press on the ball bearing on the slip ring side (see il-
lustration). The enclosed side faces the slip rings.
PRESSING THE SLIP RING BALL BEARING INTO POSITION
4. Put the spring washer into the bearing seat. Push up
the brushes and secure them with the brush springs
(this is easier if the brush unit assembly is removed).
BRUSHES PUSHED UP AND SECURED
5. Insert the rotor and screw the assembly together.
Make sure that the drive bearing housing is correctly
positioned relative to the slip ring bearing hou sing.
Press the brushes down from the outside with a screw-
driver or similar.
PRESSING DOWN THE BRUSHES
6. Fit the fan and belt pulley. The large spacer is to be
placed between the fan and the belt pulley. The small
spacer is to be placed between the belt pulley and the
spring washer. Tignten the nut to a torque of 23-29
ft.lb . (34-39 Nm, 3.5— 4 kpm).
321-5
SAAB
Nov. 1972