Need diode help

Discussion in 'General Electronics Chat' started by Spraygun, Oct 11, 2014.

  1. Spraygun

    Thread Starter New Member

    Oct 11, 2014
    6
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    I have a diesel marine generator that has a couple of bad diodes. I need to get replacements. I am looking for a replacement for a 6QD4.That # doesn't come up anywhere I search. I would appreciate any help.
     
  2. Papabravo

    Expert

    Feb 24, 2006
    10,163
    1,796
    It is probably a custom OEM part for which there are no datasheets and no replacements. They do this on purpose to frustrate do-it yourself repairmen. For the company there are liability issues for equipment that is not repaired in a factory authorized manner. Can you contact the manufacturer of the generator?

    BTW -- why does a marine generator need diodes?
     
  3. ISB123

    Well-Known Member

    May 21, 2014
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    Maybe he means alternator?
     
  4. Dr.killjoy

    Well-Known Member

    Apr 28, 2013
    1,190
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    Google 6qD4 Diode
     
  5. Spraygun

    Thread Starter New Member

    Oct 11, 2014
    6
    1
    No it is not an alternator. It is a 4KW genset. It has a diesel engine that has a generator head attached to it. The unit is used to supply A/C current to our boat. Anyway, it has a couple of different diodes. One reason that it needs diodes,is that it also generates its own 12v power. I did find a website that sells one that I need. I might be able to contact Kohler. But they do not service this unit anymore or sell parts for it. So a diode may be a long shot. Its clear that in marine world they don't like DIY service. I do appreciate any advice.
     
  6. ISB123

    Well-Known Member

    May 21, 2014
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    Can you take a picture of that diode?
     
  7. Dr.killjoy

    Well-Known Member

    Apr 28, 2013
    1,190
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    Its a Semicon Components Inc Silicon Avalanche rectifier ..
    Check out 6qD4 Silicon Avalanche rectifier for the datasheet ..
     
  8. Spraygun

    Thread Starter New Member

    Oct 11, 2014
    6
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    Here's a pic.Also this is the unit that it goes in.Not that it matters.
     
  9. ISB123

    Well-Known Member

    May 21, 2014
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    Those look like high current fuses but it could be custom made diode so I'm clueless.
     
  10. Spraygun

    Thread Starter New Member

    Oct 11, 2014
    6
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    I actually found them last night.The production numbers have changed three times since it was new.it took several hours of research. Thanks to everyone for trying to help.
     
    ErnieM likes this.
  11. Cocaine

    New Member

    Feb 24, 2015
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    I'm having the same problem. What where the numbers you found? Can you give me some leads?
    Thanks.
     
  12. Spraygun

    Thread Starter New Member

    Oct 11, 2014
    6
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    Can you be more specific.For instance,do you need the exact same diode?Or do you have a similar generator?
     
  13. Cocaine

    New Member

    Feb 24, 2015
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    I have a similar diode. It's base the same aarow mark with 4 A next to it, and 6QD4 under it.
    Thanks for the help.

    Its off a generator, but I don't know the make.
     
  14. Spraygun

    Thread Starter New Member

    Oct 11, 2014
    6
    1
    I went to partsfortechs.com. They had everthing I needed.Look in the rectifier and diode section.I do not have my parts at my hand right now.But I believe I got the Kohler 233959 which replaced the 241739.They were less than $5 each.So I purchased about 4-5.
     
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