Gererator and Field Coils

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I finally started on my ’33 836 with the Delco 927-V Generator.

I ran the armature and the field coils up to my trusty guys at Sleepy Hollow Rebuilders.

The bead blasted the armature, put it on a “growler” (luckly it passed), recut the commutator end and sealed the windings with insulating electrical spray. Perfect.

We then got to the field coils and that was a different story. Continuity tests indicated internal shorts where the insulation on the field windings rubbed together. In addition, the cloth tape that wrapped the winding acted like it was from King Tut and just fell off in pieces. The report from the Sleepy Hollow guy (the one with the head) was no bueno.

To be continued

After several calls to normal sources indicated the coils were made of unobtainium, I decided to recoat them my self.

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I carefully noted all the wire locations and started to unwind the wrapping. After removing an inch or so, I put a cable tie around the unwrapped section to keep every thing in place.

The original wrapping was 1/2″ wide and .009″” thick cotton or linen. 3M has a variety of electrical tapes.

The next problem was how to recoat all surfaces with insulation.”

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Since the wire part of the fields are wrapped around a shoe (visible in the first picture to the left and below the armature and in front of the Volt/Ohm meter) that attaches them to the housing, they are like a racetrack with the inner wire having a short wrap and then progressively larger wraps as the go out.

In order to open the wire up enough to reinsulate all the surfaces, I built a tapered tower that was slightly smaller than the inner wrap at the top and then tapered down.

This allowed me to uncoil it like a slinky and spray all the surfaces with electrical insulating spray. I then flipped the coil over, which gave access to the other side of the wire that was facing to the inside on the first pass.

To be continue, I am waiting on my 3M wrapping material

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Here is the insulating spray.

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Nice set up for spraying the wire. I have found friction tape on a lot of coils and that is what I use , most auto parts store still have it. If you run out of the coating I have a couple of cans in the shop and will give you one if you are up near Blue Ridge just call me.

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