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Any legacy regulator gurus out there?

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nuckolls.bob(at)cox.net
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Posted: Mon May 19, 2008 7:02 pm Post subject: Any legacy regulator gurus out there?

I received some pictures from a reader who is looking for an

adjustment procedure for a Delco-Remy generator regulator.



http://aeroelectric.com/Pictures/Regulators/12VN7E_Delco-Remy_4.jpg

http://aeroelectric.com/Pictures/Regulators/12VN7E_Delco-Remy_3.jpg

http://aeroelectric.com/Pictures/Regulators/12VN7E_Delco-Remy_2.jpg

http://aeroelectric.com/Pictures/Regulators/12VN7E_Delco-Remy_1.jpg



I've never seen an electro-mechanical regulator that was this

sophisticated. It appears to have airgap adjustments as well

as spring tension adjustments for both the V-reg and I-lim

relays.



I'm wondering if anyone on this IS or KNOWS someone WHO IS

familiar adjustment of these devices. I'm afraid that the

"offical" procedure will require test equipment common to

a generator/regulator overhaul shop. Unless I can find

data specific to this device (I think the 12VN7E

numbers on the base plate are a part number) I'm going

to recommend that he not mess with anything other than

the tension spring on the voltage regulator which can

be adjusted with the engine running and a light load

on the system.

        Bob . . .



        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------

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jetboy

Joined: 22 Jul 2006
Posts: 233

Posted: Tue May 20, 2008 2:21 am Post subject: Re: Any legacy regulator gurus out there?

Sir,  I dont quite want to claim guru status, working on my previous C150A from '61 it was similar and I did reset the V reg to around 14.4 - it was sitting about 13 - and reset the I reg with a wirewound resistor (one of those old monster types with the sliding clamp) to get the output up to 12 amps or so from the 'as found' 6 amps. It was actually a 20 amp generator but 12 is enough when the professional fix would be 100s of miles and $ away



I dont recall whether I altered the gaps or tension for this but I did it after cleaning the contacts from 40 years of pitting with a burnishing tool.



Some time later I had a low charge  again and discovered the aircraft master switch - which thoughtfully includes cutoff contacts for the generator field line - was in need of similar refurbishing. love these old systems because they are actually repairable - just go to where the smoke last escaped from...



Moral of the story for me was I had wrongly assumed I knew enough not to check the aircraft schematics first. In all probability the regulator may have been OK but the worn switch in the field line had reduced the drive. It did no harm checking the regulator and it would have been a shame to have it binned as it looked like new inside just as the ones pictured. So I concur with your notion to have him only mess with the V reg - perhaps after cleaning the contacts and checking the other wiring for hidden resistance.



Ralph

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Ralph - CH701 / 2200a

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