50dn Alternator Oil Leak

TheHollands! · July 11, 2015, 07:43:54 PM

I have an oil leak coming from 1 of the screws in the cover plate on my oil cooled 50n alternator. Is this something I can repair in place or does the alternator have to be refurbished? If it can be done in place, what is required? Thanks Craig

chessie4905 · July 12, 2015, 03:42:43 AM

Did you try to tighten it a little? If you do, go easy. You can replace the gasket in place.Oil circulates through the recess when engine runs to cool the diodes used to convert a.c. to dc current. Oil cooling allows the high current output.
Here:
http://www.ebay.com/itm/Delco-1976514-Diode-Cover-Gasket-50DN-Series-Bus-/321448231079

TheHollands! · July 12, 2015, 04:56:39 PM

Hey thanks Chessie, I'll order one and try it this way. Beats having to remove it. Craig

Scott & Heather · July 12, 2015, 08:34:52 PM

So, the alternator is really a generator? It initially puts out ac voltage? If so how much? You do know where I'm going with this right?

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eagle19952 · July 13, 2015, 05:53:56 AM

Quote from: Scott Bennett on July 12, 2015, 08:34:52 PM
So, the alternator is really a generator? It initially puts out ac voltage? If so how much? You do know where I'm going with this right?

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The generator, on your Grampa's old 1946 automobilr actually made DC current.
An alternator on you toad or bus makes AC current that is converted to DC.

Where are you going ?

chessie4905 · July 13, 2015, 07:48:57 AM

GM calls it a generator in the shop manual. The 4104 used the old design dc generators with voltage regulators with relays to control voltage, amperage, and output. Near the last years of production, they offered an (alternator)generator similiar to what we have today. I don't know if they used different terms for the two in the 4104 supplement manual. My 4905 outputs 240 amps at rated speed.yrmv.
Btw, my coach uses an o-ring to seal the cover. Don't know when the upgrade from a gasket began.

Scott & Heather · July 13, 2015, 07:51:46 AM

Eagle, ignore me. I'm lost. I was thinking 120v ac but realized its putting out 24 volts. Duh

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eagle19952 · July 13, 2015, 09:24:11 AM

Quote from: Scott Bennett on July 13, 2015, 07:51:46 AM
Eagle, ignore me. I'm lost. I was thinking 120v ac but realized its putting out 24 volts. Duh

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Scott & Heather · July 13, 2015, 11:33:49 AM

Really!?

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eagle19952 · July 13, 2015, 01:55:12 PM

Quote from: Scott Bennett on July 13, 2015, 11:33:49 AM
Really!?

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Yes...120v is (relatively) easy... it's the hertz that hurts...

chessie4905 · July 13, 2015, 04:34:46 PM

I forgot to mention....remove hex plug below cover before taking it off. There is about 1 qt of oil in the diode cavity behind the cover. Don't need to refill; engine will fill it. Just put the oil back in engine if it is clean

Scott & Heather · July 13, 2015, 04:53:50 PM

So it's not 60, how many is it? I mean can we run 120 into our coaches and avoid generator install?

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eagle19952 · July 13, 2015, 07:18:36 PM

Quote from: Scott Bennett on July 13, 2015, 04:53:50 PM
So it's not 60, how many is it? I mean can we run 120 into our coaches and avoid generator install?

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my limited knowledge is this, it would be somewhere around 400Hz.

Light bulbs don't care.

747's use similar Hz. I think...

you could not do this with your existing Alternator.

Scott & Heather · July 15, 2015, 04:56:53 PM

Ok. Another bubble burst

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