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  1. D

    MEP 803a failure

    On an aside, did you see any smoke coming from behind any panels, or from the generator itself while running, or only from the engine exhaust? This is a lot of current going somewhere, and something is severely overheating with this much power. Also, don't run the generator. In case it is a...
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    MEP 803a failure

    The 133% is telling me that the generator is producing power when it's running, but it's going somewhere else. I would definitely pull the top off the machine, and inspect the wires between the generator the voltage selector switch (the big switch behind the back panel), and contactor. Look at...
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    MEP 803a failure

    This sounds suspicious. Did the meter read 130% with the output contactor open or closed? The current transformer that measures this is located in the generator output wiring. This would indicate that the generator was producing power, but feeding an overload or short circuit. I would pull the...
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    MEP-802a House hookup

    If you don't want to get new connectors, you could reverse your setup, with the cable coming out of the panel (assuming that's legit in your area), and the receptacle installed on the generator. That is how I set up my 802, since I use it for other uses besides backup power, so I can just plug...
  5. D

    MEP-802a House hookup

    Is that pin and sleeve connector a male or female receptacle? The one in your post looks like a female receptacle, and male plug. You don't want to have hot pins on the plug, if the male end is on the generator. That would create a potential safety/shock hazard.
  6. D

    Mep 803a voltage regulator

    Basler makes excellent equipment, although also with an "excellent" price tag. Dewy must have liked their quality AVR's, since my four MEP-531A's all came with a Basler AVR.
  7. D

    Percent current meter

    Do you have the amp meter selector set to the correct position? Is the machine configured for 1 or 3 phase? Try rotating the amp meter switch to try and clean it up; spray some contact cleaner in it if you have any. If it doesn't help, try connecting your load to a different lug, and see if the...
  8. D

    Mep531a.wont start or hit

    Since you got it with so much oil that it was pouring out, I suspect the previous owner overfilled the crankcase with oil. Drain some of it out, to the middle of the markings on the dipstick (with the dipstick screwed in). The Yanmar 48's are very sensitive to too much oil, and will run like...
  9. D

    Mep531a.wont start or hit

    When you say filling the crankcase with fuel" , how much fuel are you getting in there? There are only two ways for fuel into the crankcase; through the pump, or past the piston/rings. The pump only pumps about a drop per injection cycle. You would have to crank the engine for quite a while to...
  10. D

    USMC MMG25 Generator question

    Are you sure this is a 120/240 volt unit, and not a 480 volt / three phase?
  11. D

    I need help with a fuel problem with a MEP 802A

    and I think it is the check valve that is stuck shut. The little part sticking out the right side of the part you are pointing at, is the check valve (delivery valve). That part should freely move within the part you are pointing at (valve seat). If it's stuck (usually gummed up), soaking it in...
  12. D

    Bringing diesel generators back into service?

    Just some random thoughts I am throwing out here. - Do the commercial units have the control panels (excitation controls)? From a safety perspective the voltage is what is dangerous for you. The high KVA/Amp ratings only make problems more spectacular. (We used to power construction sites and...
  13. D

    Mep802a coolent

    That sludge looks the same I had in my T-stat housing and water pump (802A) when I opened it. It is gelled leak sealer. Apparently my unit had a leak at the hose to radiator connection, and someone filled the unit with leak stop, instead of soldering the radiator inlet pipe. This stuff cleaned...
  14. D

    Dewey MEP 531a running horrible

    If it's being bogged down by the generator, it's either mechanical or an electrical overload. I doubt it's mechanical, since you would hear that and most likely see sparks. To rule out a generator internal electrical problems I would disconnect the voltage regulator, and tape off the leads, then...
  15. D

    MEP-531A not working due to electrical issues

    Thank you for sharing that info. Definitely beats $650 for four from the Gov. supplier. I just ordered some off their site as well. Here is the page that shows the brush (last one on the page). http://www.carbonbrush.com/springloaded3.htm
  16. D

    MEP-531A not working due to electrical issues

    That's an understatement. I just (4 May) received a quote from Aerobase for 4 (Four) spare brushes. $159.99 ea. 4 for $639.96. Over $600 for four pieces of glorified pencil lead!
  17. D

    Dewey MEP 531a running horrible

    Question: You say - when manipulating throttle anything over half throttle it dies out - Are you manually holding the throttle to start the engine? On the 531's, the throttle lever is either on - latched, or off -tripped. Some things to think about: The pegged hertz gage - do you have a way...
  18. D

    MEP-531a

    More filter parts. I just searched e-bay for a new filter and multiple listings for a filter, bowl and gasket came up, for less than $20 for the set. Search for " New Yanmar Fuel Filter with O-ring & BOWL 104500-55710 ".
  19. D

    Dewey MEP 531a running horrible

    Have you tried removing the stainless steel spark arrester on the muffler. If that is plugged it could cause too much backpressure at full throttle. This is the easiest test before you dig into the machine further.
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