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Thread: The Eternal Alternator Choice Topic

  1. #101
    JPerkins's Avatar
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    Default Re: The Eternal Alternator Choice Topic

    Quote Originally Posted by Gilbert Pierce View Post
    J, Voltage regulators use off/on switching to control output voltage via the rotor coil current. Some alternators, most notably Delco use a capacitor across the VR inside the alternator case to quiet it down.
    Well, I'll keep looking for a voltage regulator, maybe even straight from denso.
    If anyone has a line on one let me know.

    Sent from my SM-G930V using Tapatalk
    Jason Perkins

  2. #102

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    Default Re: The Eternal Alternator Choice Topic

    I don't know anything about Denso other than I will not install one. I had one spin the nut and pulley off. Normal direction of rotation on the one that failed loosens the nut and there was no provision for a key on the shaft or pulley... just a set screw to hold the pulley when the nut came loose. My guess is the pulley nut was not properly torqued but, without a keyed shaft to keep the pulley from turning against the nut, I certainly wasn't going to install another one. There was no model number or ID plate on this one maybe other models have a keyed shaft.
    "Good judgement comes from experience, and experience comes from bad judgement." - Fred Brooks

  3. #103

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    Default Re: The Eternal Alternator Choice Topic

    Quote Originally Posted by Jeff J View Post
    I don't know anything about Denso other than I will not install one. I had one spin the nut and pulley off. Normal direction of rotation on the one that failed loosens the nut and there was no provision for a key on the shaft or pulley... just a set screw to hold the pulley when the nut came loose. My guess is the pulley nut was not properly torqued but, without a keyed shaft to keep the pulley from turning against the nut, I certainly wasn't going to install another one. There was no model number or ID plate on this one maybe other models have a keyed shaft.
    I made that post working off the assumption the problem alternator is a Denso because the auto parts store could not identify it and someone told me that is what it is (from a tractor). However, it does not look like any of the Denso alternators pictured in this thread. There was no documentation for the installation.
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    "Good judgement comes from experience, and experience comes from bad judgement." - Fred Brooks

  4. #104
    JPerkins's Avatar
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    Default Re: The Eternal Alternator Choice Topic

    Looks like a motorcraft alternator to me. Also every alternator I know of does not have a keyway and works off the clamping force of the nut. If it spun off then it was likely not torqued properly.
    Jason Perkins

  5. #105

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    Default Re: The Eternal Alternator Choice Topic

    I thought all alternators use a woodruff key. I don't have experience with non-aviation components and haven't had to remove many pulleys over the years since they come installed. I chose Plane-Power because their drawing shows a slot for one in the pulley. I didn't disassemble it to confirm it though. The Hartzell and Kelly alternators do for sure because checking the woodruff key for damage is a step in replacing the fan.

    I don't have one to look at here but I was thinking Motorcraft had a fan under the pulley. The rear connections on this thing are different too. That is what was throwing off the guy at the parts store.
    Last edited by Jeff J; 10-11-2017 at 06:24 PM.
    "Good judgement comes from experience, and experience comes from bad judgement." - Fred Brooks

  6. #106
    Rick-CAS's Avatar
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    Default Re: The Eternal Alternator Choice Topic

    I had one like that on my RV-3. It's a Mitsubishi alternator. I think it was made by Nippendenso before they became Denso. Mine had a Mitsubishi logo cast on the back. It beat the rear bearing out of it but it never failed just was making noise during the condition inspection.

  7. #107

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    Default Re: The Eternal Alternator Choice Topic

    Thanks Rick, I had been wondering about that thing. No markings on it other than the standard wire connection letters and a sticker from the shop that did the last rebuild. It didn't truly fail, I just found the pulley laying on top of the carb heat box after flight and it had ruined the threads on the shaft before it came off. Judging from the shop sticker on the side it likely had less than 20 hours since rebuild but I don't know if the previous owner or the shop installed the pulley.
    "Good judgement comes from experience, and experience comes from bad judgement." - Fred Brooks

  8. #108

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    Default Re: The Eternal Alternator Choice Topic

    I thought I would seek confirmation from Plane-Power on the drawing that I thought showed a keyed pulley so I sent them an email. I was disappointed to learn none of their belt driven alternators use a keyed shaft.
    "Good judgement comes from experience, and experience comes from bad judgement." - Fred Brooks

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