Posted by Owen Aaland on December 01, 2014 at 16:41:18 from (216.47.34.37):
In Reply to: IH 3514 generator posted by undoctor on December 01, 2014 at 13:38:40:
The Delco 10SI and 12SI are very similar alternator. The difference is the 12SI was designed for higher output and so has better cooling. The rectifier bridge has a bit larger heat sink. The rear frame has more ventilation slot area. The fan is more efficient at moving air.
When replacing a generator with an alternator there really is no advantage to using a higher output unit since even the smallest alternator will put out more amps than the original generator. The biggest problem with those alternators on farm equipment is vibration. The 10SI alternator is available with swing brushes rather than the original sliding brushes which greatly increases their life and pretty much eliminates the brushes hanging up in the holder. I have seen 12SI alternators with the swing brush assembly but what they are is the rear frame, brushes, and rectifier bridge from a 10SI mated with a 12SI front frame. There is not much advantage to that unit unless you are looking at a 100 amp unit.
Back of the 10SI type 110 with sliding brushes
Back of the 10SI type 116 with the swing brush assembly. Note the additional screw and relocated slot for the brush retainer pin use for assembly. It also has additional reinforcement webs for the rear bearing.
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