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Thread: MEP 831 FAQ for owners or potential buyers

  1. #21
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    See page 284 of the TM for more instructions, but it says to use a feeler gauge of .010 inch thickness to check for clearance between the stator and rotor. Honestly, I'm pretty sure the clearance will be OK on it's own. I'm not certain you'll be able to recover a steel feeler gauge.

  2. #22
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    Just trying to give you the benefit of my experience with these sets.
    What I have explained would make it easier to install the rotor onto the engine.
    This is how I've done it hundreds of times.
    I do believe the TM is correct if you don't have a piece of plastic, if you have one it will be easier.
    I don't believe the clearance will be ok on it's own, remember these are very strong magnets that will slam into the stator when trying to install it. The plastic keeps it from sticking to one side or the other.

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  4. #23
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    Quote Originally Posted by Dewie38 View Post
    Just trying to give you the benefit of my experience with these sets.
    What I have explained would make it easier to install the rotor onto the engine.
    This is how I've done it hundreds of times.
    I do believe the TM is correct if you don't have a piece of plastic, if you have one it will be easier.
    I don't believe the clearance will be ok on it's own, remember these are very strong magnets that will slam into the stator when trying to install it. The plastic keeps it from sticking to one side or the other.
    Maybe my post wasn't clear, I was trying to answer the question regarding the acceptable plastic thickness. Per the manual, it could be as thick as .010". I then expanded the answer as I can't see using a steel feeler because I don't know if one can withdraw it. Maybe if the feeler was brass it would be OK. I like your idea (beause I have seen how the stator will try to cock it's self) and have already "borrowed" some sheet protectors from work.
    Last edited by Cord; 02-18-2015 at 22:37.

  5. #24
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    I was looking for the fuel filter info and figured out that the fuel filter setup on the 831 is a Racor 120A with a R12T element.

    If you have a unit missing the main fuel filter you can see what you need in the attached brochure.

    Edit - This is an alternate for the WIX 33583 filter.
    Attached Files Attached Files
    Last edited by DieselAddict; 03-04-2015 at 17:56.
    Chris Medico
    MEP-003a (sold), MEP-803a, MEP-802a, & MEP-831a

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  7. #25
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    I stumbled upon the TM for the engine. Nice resource.

    http://www.liberatedmanuals.com/TM-9-2815-257-24.pdf

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  9. #26
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    Thanks for that TM, cdre.

    Has anyone had trouble with a leaking oil pressure switch? I have a dripping leak from the plastic sensor part (not the metal adapter that threads into the block) and haven't had any luck finding it based on either the part number (SM-2B-15F) or NSN (5930-01-478-0122). The one I'm looking at can be seen on pages C-94 and C-95 of TM 9-6115-639-13P.

    I'm hoping someone has cleared this hurdle before...
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  10. #27
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    There is a fellow selling parts on eBay. I'm sure he has a used one.

  11. #28
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    I am assuming that the battery is needed to run this unit since it has an electric fuel pump. I am also assuming that the unit can be powered by the military slave cable. I don't think the unit will start and run without a power supply of some type. I have the mep 531a that will run without a battery or power source but I don't believe the mep 831a will run without a battery or power source because of the electric fuel pump, the fuel tank is below the engine and the warning lights etc. Some one mentioned a battery charger will run the unit but that is defeating the purpose of having a generator.

  12. #29
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    A battery isn't required if the fuel system is otherwise primed. You can pull start the engine and as soon as it kicks off it will power up the fuel pumps. Just don't forget to turn on the main switch before starting the engine or you will run the fuel line dry and will have to refill it manually. Been there done that.

    Also make sure you put the positive battery terminal on the insulating terminal that should be mounted to the front next to where the battery goes. That will keep you from grounding out the control voltage.
    Chris Medico
    MEP-003a (sold), MEP-803a, MEP-802a, & MEP-831a

  13. #30
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    Thanx DieselAddict. How do you prime the fuel system ?? Do you just fill the tank and fill the fuel pump/seperater ?? Thanx for the response.

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