Charging Systems: Generators: Overhaul: Reassembly

Clean and inspect all parts. Assemble parts in reverse order of disassembly, noting the following points:

1. After installing end plates on fan and commutator ends, install spacer rings with repair press and adapters (VW 401, 412, & 421 or equivalents). For Types I & II 12 volt only.
2. If cables on terminals D+ and D- are interchanged, even for a short time, the generator polarity will be reversed and this will damage the regulator.
3. Tighten fan nut with a torque wrench and 36 mm socket to a torque of between 40-70 ft. lbs. (5.5-6.5 mkg).
4. After assembling, especially after a new armature or new field coils have been installed, the generator must be polarized. This is done by letting the generator run briefly as a motor to give the pole shoes the necessary residual magnetism of the correct polarity. To do this, connect generator to a battery with positive battery lead connected to D+ and negative lead connected to DF and D-terminal of generator.
   Fig 1: Type I & II Generator (Typical)

   Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.