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Delco and other Low Voltage DC Light Plants Antique Generators, Light Plants, Typically 24, 32 or 48 volt although some are 110 volt. DC Lamps, Motors and appliances.

Delco and other Low Voltage DC Light Plants

Delco 8C3 Light Plant


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  #1  
Old 10-10-2014, 10:44:13 AM
lc361 lc361 is offline
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Photo Delco 8C3 Light Plant

I have just cleaned up my Delco 8C3 (Photos Attached)
I removed dozens of years of hard packed dust.
It appears to have been repainted and not run since.
Can anyone tell me whether it is an old restoration or a factory rebuild, or something else.

On turning the flywheel I can detect no compression.
What may be the cause of this?
What can I do about it.

Thanks for any help.
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  #2  
Old 10-10-2014, 01:18:54 PM
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John Newman, Jr. John Newman, Jr. is offline
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Default Re: Delco 8C3 Light Plant

These are pretty low compression engines to begin with. Are the rocker arms adjusted to allow the valves to close fully? At TDC on the compression stroke, you should have some clearance between the valve stem and the rocker arm. Somewhere around .010" would be my guess. Try putting a little oil in the cylinder to see if that gives you any better compression. If so, your rings may be stuck in their grooves or just worn out.
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  #3  
Old 05-22-2015, 07:56:28 PM
lc361 lc361 is offline
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Default Re: Delco 8C3 Light Plant

I have been able to get this engine to run. It starts easily from the battery.
However, it tries to run away as if there is no load on it. It does not change over from starter to generator.
Any help on getting this fixed will be greatly appreciated.
I have been trying to determine how much this plant has been used. I decided that wear on the commutator is a good guide. Is this reasonable?
I can measure almost no (< 0.01") wear there.
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Old 05-22-2015, 10:34:48 PM
Vanman Vanman is offline
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Default Re: Delco 8C3 Light Plant

I've never had the pleasure of tinkering with one of these, so these are just some general thoughts. If the shunt winding circuit was open, it may be able to run away as a series motor during cranking. Also in that case it would never reach a voltage higher than battery voltage, and the controls may well depend upon this to cut out the cranking circuit. Does it sound like it's still firing when it's running too fast?

I've heard from others on the group that the red ones were factory overhauled.

Keith
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Old 05-26-2015, 07:27:00 PM
lc361 lc361 is offline
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Default Re: Delco 8C3 Light Plant

When cranked the engine runs. The ammeter goes from discharge to zero.
I can control the engine rpm by manually retarding the throttle.
The generator function does not work. I am considering siring a manual switch so that I can switch from starter to generator and see if this works.

Thanks for the tip on the rebuild color. This may explain why this plant shows little wear.
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Old 06-02-2015, 12:37:58 PM
John SH John SH is offline
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Default Re: Delco 8C3 Light Plant

I don't see you have an answer to your issue with charging. I also have the same issue.

At first, I couldn't get the unit to run, (although it would crank) with the original coil. I added an old automotive coil and condenser, wiring it into the circuit through the points. It runs fine with this addition but will not charge.
It seems we have a similar problem with the charging.

My question, does anyone know if the original coil is integral to the charging circuit?

Also, where would I install a new condenser so I could use the original coil?
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