Pulley And Fan Removal; Separation Of Drive Shield And Collector End Shield - Bosch T1 Alternator Repair And Testing Instructions

2. Connect Multimeter MMD 302 (Bosch Number 0 684 500 302) or equivalent to the lead of the suppression
capacitor and the B- terminal of the alternator. (Figure 8)
3. Measure the capacitance of the suppression capacitor. If the capacitance does not read between 1.8 and
2.6 lF (microfarad), the capacitor must be replaced.
4. Remove the screw that secures the suppression capacitor and remove capacitor.
Note: After removing the suppression capacitor from the alternator, the capacitor lead should be shorted to the
capacitor-mounting strip to discharge the capacitor. Failure to do so may cause the capacitor to discharge
while being cleaned.

9.4 Pulley and Fan Removal

1. Using a 14-mm hex socket to hold the rotor shaft. Loosen and remove pulley-retaining nut with a box
wrench. (Figure 9)
Note: Do not use an air impact gun to remove the nut as the force of the impact may cause
damage to the alternator bearings.
2. Remove the pulley and cooling fan from the alternator.

9.5 Separation of Drive Shield and Collector End Shield

Note: With a scribe, mark the relationship between the drive end shield and the collector ring end shield. This
will assist in the realigning of the two shields upon reassembly.
1. Loosen and remove the four (4) outer Oval-head screws which hold the end shields together. (Figure 10)
All rights rest with Robert Bosch Corp, including patent rights. All rights of use of reproduction and publication rest with R. B. Corp.
UA/ASV
Repair and Testing Instructions for T1
Alternator 0120 689 552
Figure 9 Pulley and Fan Removal
04.12.98
Figure 8 Testing of Suppression Capacitor
Page 17
Edition 001
T1ALTFinal.DOC