67 Alternator Rotor Color

[Ralph P.]

Need some advice how to obtain & apply the correct "red" coating to a replacement rotor ??

[Wayne M.]

Re: 67 Alternator Rotor Color

Need some advice how to obtain & apply the correct "red" coating to a replacement rotor ??

Ralph -- You must mean "stator", as you can't see any part of the rotor when alternator is on the car. Further, you're probably referring to the alternator (stator) windings. The '65 TIM&JG refers to a "clear to dark caramel colored coating which darkens in color with heat". You'd have to tell us in more detail [for us non-67 types] what the '67 manual calls for.

[Ralph P.]

Re: 67 Alternator Rotor Color

Thanks, Wayne.... I think the stator and rotor were originally coated with that substance . There was a past reference to this coating being possibly available at electrical supply service companies . I haven't been able to find it locally..... wonder if anyone has found it on the web ?

[Wayne M.]

Re: 67 Alternator Rotor Color

Ralph -- here's an NOS stator 1959531, used on 55 amp air cars '63-5 w/o TI. No evidence of anything red. Perhaps what the '67 JM meant is that the copper color shows through the clear coating on the windings, and this might appear to be red.

[Dick W.]

Re: 67 Alternator Rotor Color

I believe the coating was Gyptol (sp)

[Ralph P.]

Re: 67 Alternator Rotor Color

Thanks, Dick.... Gyptol could be it; but, I thought it was more like a varnish substance ? Isn't Gyptol a paint?

[Ridge K.]

Re: 67 Alternator Rotor Color

Ralph, here's a technical web description of the product (Glyptal).

Perhaps you can click onto it (the product number) and acquire additonal data.

1201
Red Alkyd (Brush/Spray/Dip). Bake or air dry. Meets MIL-E22118; used for coils, armatures and other electrical apparatus. Also used as a primer, sealer for screws, pipes, vacuum systems and hydraulic fluid chambers

[Wayne M.]

Re: 67 Alternator Rotor Color

I believe the coating was Gyptol (sp)

Dick -- Yes, per How-to Hotrod BB Chevs, "Glyptal is made by General Electric for coating electric windings in generators and electric motors". I believe the pic below shows this paint (orange enamel) applied under the timing cover (on this motor, anyway) and (for sure) in the lifter valley area to speed oil drainback to the sump.

But I can't imagine that Delco Remy put this stuff anywhere on alternators.

[Jack H.]

Re: 67 Alternator Rotor Color

67 JG text is somewhat similar:

"Insulation on both the alternator windings and the laminated metal plates separating the alternator case halves is a clear to dark caramel colored coating."

I believe the 'strange/unique' substance is shellac. This is a common insulating coating for copper wires used in motor/transformer/inductor windings. The object is to electrically isolate adjacent windings without increasing winding space (as a conventional plastic coating would do).

The same is true of laminated magnetic cores. Keep airborne moisture from getting between the plates and corroding/oxidizing them...

[Ralph P.]

Re: 67 Alternator Rotor Color

Ridge, this looks exactly like what I need !
Thanks

[Dick W.]

Re: 67 Alternator Rotor Color

I'se confused

[Jack H.]

Re: 67 Alternator Rotor Color

Ditto, Dickie! I think he clicked the wrong thread in the sequence to chime in on...

[Alan D.]

Re: 67 Alternator Rotor Color

Here is an original alternator with the finish similar to Wayne's Think it may be a 69 unit however you should check the pn.

[Ralph P.]

Re: 67 Alternator Rotor Color

I'se confused

Sorry Dick.... Ridge was my target !