The armature

The armature

Apart from reconditioning the commutator, there is little which can be done to the armature itself. Never try to straighten a bent shaft and do not machine the armature core. Armature windings are tested with equipment normally not available to the car owner. The only check for a suspected faulty armature which the owner can do is to substitute an armature which is known to be satisfactory.

Generator bearings

1. Commutator end head bearings. Remove the ballbearing outer race stop bracket mounting screw and nut, ease out the stop brackets and the ballbearings.
2. Fan end head bearing. Remove the ballbearing retainer mounting screw nuts and ease out the retainers and the seals. Using a suitably sized drift remove the ballbearing.

Reassembly is the reverse procedure to dismantling in both cases.

Reassembly and refitting the generator

This is the reverse procedure to dismantling. The following points should however be noted.

1. The commutator end head ballbearing outer race stop bracket mounting screw nut must be tightened to a torque wrench setting of .80 lb ft.
2. The pulley and fan-to-generator armature shaft self-locking nuts must be tightened to a torque wrench setting of 14.5 lb ft.
3. To assemble the commutator end bracket to the yoke, partially withdraw the brushes and trap them in this position by letting the springs bear on the sides of the brushes. Fit the bracket to the armature shaft and when it is about 1/2 inch from the yoke face, lift the springs using a thin screwdriver or a piece of hooked wire and this will let the brushes drop onto the commutator. Check that the springs now bear correctly on the tops of the brushes and push the bracket fully home.
4. Pack all ballbearings with Fiat Jota 3 grease or an equivalent grade grease.