MEP105A Gen Starts and dies

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ICAT

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I work for a small municipality and we have a generator that just starts and dies. Fuel filters have been changed. Speed switch and oil pressure switch have been checked according to the -12 manual. Any help would be great.
 

155mm

Chief and Indian
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Guymon, OK
First thing i can think, holding start switch in start position until oil pressure comes up
 

Guyfang

Well-known member
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Burgkunstadt, Germany
OK, now I got you. The precise power model. Now we are on the same page.

Need some backround info.

Have you ever seen it work right? Did someone work on it before it started doing this? Is that all that was done, fuel filters changed?

Also, does it shut off as soon as you let the S2 start switch go? Or will it run a bit longer before shutting down?
 
Last edited:

ICAT

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Location
Idaho
Found it. It was the check valve on top of the injector pump. Took off the t-fitting on top of the injector pump and it started right up. Shot fuel everywhere but it started and ran. So I took it back to my shop and empty a can of brake cleaner on it and the ball started to move. There was a lot of rust and crappolla in it. Thanks for the replies
 

Guyfang

Well-known member
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Burgkunstadt, Germany
That's a pretty normal fault for this set. Dump a few cans of carburetor or injector cleaner in the fuel supply. The L1, (Engine fuel shut off solenoid) and the FL-1 and FL-2, (fuel level switch)and the L2, (Day Tank solenoid) tend to also get gummed up with the lacquer.

I am surprised that you have a MEP-105A! Its the rarest of birds in the Army power generation world. They bought thousands of MEP-006A's and many hundreds of the MEP-115A, (400 hertz) but very few MEP-105A. There simply wasn't enough need for a precise power gen set at the time, other then the 400 hertz generators. I spent almost 30 years working on army gen sets, and saw very few, maybe 10-12 sets. I assume yours has the electronic governor and actuator set up. The OLD, OLD, OLD Hyd governor and actuator were a nightmare to work on. If you look in the -24P you can still find this gear, but we changed over in 1980 I think. I worked more then 8 years on the 115A model. Its the same as the 105A, just a different main gen and a few other parts. GOOD gen set!
 

ICAT

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Location
Idaho
it was purchased from a federal surplus as a emergency generator. We have had it installed for a year. This is the first problem we have had so we are pleased with it
 

Guyfang

Well-known member
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Location
Burgkunstadt, Germany
This gen set likes a full load. If you run it under 50-60%, it will begin to wet stack real fast. The crankcase blow by will begin to slobber like a professional drunk. If you can, keep it at least at 75-80%, even if you have to use a load bank. As a matter of fact, you will see in the TM's that the set had an optional load bank that was mounted on top of the set. We always set it for about 15 KW, then ran our normal loads. If the gen set went into the close to overload state, the load bank automatically kicked out. If the fuel tank is a steel tank, take a look see in it for water and rust. That's the reason the Army went to plastic tanks. If I remember right, the tank drain is the rear of the set. Take a gallon glass jar and drain out a gallon. Then you will see if its got water in it. The same with the day tank. Every 6 months or so, take a look see if your fuel supply is not real clean. Don't forget the fuel strainers in the 2 electric fuel pumps. I would run the set 2-3 times a year at as close to full load as I could for at least 3-4 hours. It will love you for it!
 

Chainbreaker

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Location
Oregon
Since you earlier said this about the check valve "There was a lot of rust and crappolla in it." I would blow out all the fuel lines while the injection pump is out for the rebuild if you haven't done so already.

Not knowing how often it was brought into service at your municipality and how many hours was put on it since purchased I'm guessing the fuel is OK...no water in fuel, no gumming of fuel and fuel tank is reasonably clean?
 
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