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240 voltage regulator question 200

posted by  volvosfive on  Sat Nov 13 16:51 CST 2004
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last visit: Sun Aug 21 08:01 CST 2011
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I took the voltage regulator off of my 86 240 wagon today to try and switch it with another and I noticed that the two long contacts on it are worn unevenly. Could this be the cause of the no charging problem? If not, how difficult is it to rebuild my old alternator?

Thanks,
Dave








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    240 voltage regulator question 200

    posted by  Niel on  Sat Nov 13 21:25 CST 2004
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    last visit: Thu Oct 23 12:56 CST 2014
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    The springs behind the brushes are not precision engineered or matched. They will apply different force, resulting in different wear. No problem/faut.








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    240 voltage regulator question 200

    posted by  B.C. on  Sat Nov 13 18:36 CST 2004
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    last visit: Wed Mar 28 22:28 CST 2012
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    Every set I have ever take out of a 240 alternator had brushes worn unevenly. Why, I do not have a clue.

    If both brushes are at least 5mm long, charging won't be affected.

    If a brush gets really short, it is possible that there will be sparking between the brush and its slip ring. That can cause pitting, making the contact even worse. Pitting can be repaired, but it's not easy and can be done only if the ring thickness after sanding down is within spec.

    Order a new set and install them. Then check the voltage. At the battery is should be around 14 volts with the engine running.


    Good Luck,

    Bob

    :>)







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      240 voltage regulator question 200

      posted by  volvosfive on  Sun Nov 14 02:23 CST 2004
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      last visit: Sun Aug 21 08:01 CST 2011
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      Hi Bob,

      By the brushes, do you mean the two prongs coming off of the alternator? Mine are definately longer than 5mm. If this isn't the problem, is there anything else that I can replace in the alternator to make it work again?

      Thanks,
      Dave








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    240 voltage regulator question 200

    posted by  81242DLB21FCA on  Sat Nov 13 18:09 CST 2004
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    last visit: Thu Oct 23 22:26 CST 2014
    [RELATED]

    Was the alternator putting out anything above 12 Volts at all?








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      240 voltage regulator question 200

      posted by  volvosfive on  Sun Nov 14 02:21 CST 2004
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      last visit: Sun Aug 21 08:01 CST 2011
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      Well the battery is also getting weak so I guess that could have been a factor. I was getting less than 12 volts at the battery with it running (kinda like the car was running off of the battery with no help from the alternator). Can you recommend any good batteries for this thing?

      Thanks,
      Dave








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        240 voltage regulator question 200

        uid 18083's pic
        posted by  lucid on  Sun Nov 14 04:57 CST 2004
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        last visit: Fri Oct 24 12:31 CST 2014
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        "Can you recommend any good batteries for this thing?"

        Don't blame the Battery. It just starts the car. The Alternator is supposed to run the car AND charge the battery.

        With engine running, measure voltage at Alternator and then at the Battery. If Battery measurement is significantly lower (i.e. 1.5 to 2 volts), suspect a poor connection between the two.

        Check this thread from a couple of days ago.

        --
        Bruce Young
        '93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.








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          240 voltage regulator question 200

          posted by  volvosfive on  Sun Nov 14 08:11 CST 2004
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          last visit: Sun Aug 21 08:01 CST 2011
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          Well I'm going to blame the battery because I know it's also bad. Guess I need to replace it first to do some more precise diagnosing of the charging problem. The current battery is a cheap one that someone stuck in before I bought the car. It doesn't even fit the car ( too tall and doesn't have the ledges on the lower part for the battery hold down clamp to anchor onto. My question was: Do you know what the correct size battery is for this '86 240? I'll probably buy an Interstate battery for it.

          Thanks,
          Dave







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