Hi All,
This is a great source of expertise. I'm trying to get my 57 back on the road after 23 years of rest. It was born in Feb of 57.
I just pulled the dynamo because it wasn't working. It seems to pass the tests but only puts out about 9V (eliminating the control box). I get 5.9 ohms from the field coils and .3-.4 ohms at the commutator and no apparent ground faults so I'm stumped. I'm going to try putting a cheap off brand in temporarily and in the mean time, I also discovered that the dynamo is a C40 (22704) with a 62 date code. I want to try to find a C39 (22258) with an appropriate date code (late 56) but would like the additional amperage of the C40. Questions for the experts...
1) I want to confirm that if/when I get a C39 yoke, can rebuild the C39 with C40 parts? I realize that there are differences between the two in terms of nuts and woodruff key but if I swap everything but the yoke, I get the extra amps with a correct date. I'm pretty certain that the armature and field coils will fit.
2) Does anyone know of a C39 yoke with a late 56 or Jan 57 date code?
3) Are all 22258's the same? I found some for other uses and parts (like International tractors) that I can get cheap for temporary then spare usage.
Thanks for your expertise. I'm sure I'll have other questions for you all.
GC
This is a great source of expertise. I'm trying to get my 57 back on the road after 23 years of rest. It was born in Feb of 57.
I just pulled the dynamo because it wasn't working. It seems to pass the tests but only puts out about 9V (eliminating the control box). I get 5.9 ohms from the field coils and .3-.4 ohms at the commutator and no apparent ground faults so I'm stumped. I'm going to try putting a cheap off brand in temporarily and in the mean time, I also discovered that the dynamo is a C40 (22704) with a 62 date code. I want to try to find a C39 (22258) with an appropriate date code (late 56) but would like the additional amperage of the C40. Questions for the experts...
1) I want to confirm that if/when I get a C39 yoke, can rebuild the C39 with C40 parts? I realize that there are differences between the two in terms of nuts and woodruff key but if I swap everything but the yoke, I get the extra amps with a correct date. I'm pretty certain that the armature and field coils will fit.
2) Does anyone know of a C39 yoke with a late 56 or Jan 57 date code?
3) Are all 22258's the same? I found some for other uses and parts (like International tractors) that I can get cheap for temporary then spare usage.
Thanks for your expertise. I'm sure I'll have other questions for you all.
GC