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Military MEP and Aircraft Gen-Sets MEP Mobile Electric Power, APU Auxiliary Power Unit and other military surplus generators.

Military MEP and Aircraft Gen-Sets

MEP-016A 4A032 Keeps Shutting Down

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Old 07-20-2018, 10:13:28 PM
nezwick nezwick is offline
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Location: Medina, Ohio, USA
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Default Re: MEP-016A 4A032 Keeps Shutting Down

Well I think I have solved this issue!

I took the carb apart one more time, mainly to assess my homemade gaskets since you mentioned that could be something not quite right.

What I found was, a crack in the carburetor. I had missed this so many other times because it was so small and pretty much just looked like a casting flaw.

My best guess is some fool screwed in the main jet needle way too far and caused stress to the metal around the orifice where the needle tip goes. It was about 3/32" long running from the orifice upwards.

I had some gasoline resistant sealant material laying around so I gave the whole thing another thorough cleaning and then applied the sealant to the crack. Let it cure for about a half hour and then reassembled. And guess what, it runs perfectly now. No stalling, no rich condition, and needle valves actually work.

Ran nicely for about 30 minutes before I had to quit and come inside.

Only time will tell if the repair will actually last, or if I'll have to re-do it with JB weld or some sort of aluminum solder. But for now I'm pretty happy with that result.

On to the next question:

How do I tell if the thing is actually running at 3600 RPM? It sounds good by ear but my tachometer needs to be able to sense the impulses of the spark plug wires, and the shielded wires on this unit prevent that. Is there another wire I can connect the tach to?

I know it's supposed to make 60 Hz at 3600 RPM, but no matter how fast I run the engine, I can't get up higher than 58-59 Hz (unloaded). Ideally it should be 61-62 Hz unloaded and 60 Hz loaded. This might be an issue with the Hz gauge, but I can't figure out how to get my multimeter to display Hz to compare the results.
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Old 07-23-2018, 09:40:08 AM
miltruck miltruck is offline
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Default Re: MEP-016A 4A032 Keeps Shutting Down

I just posted on another thread about the dangers of using ethanol gas in these engines, so I won't repeat myself.

Contact Saturn Surplus (by phone) and check with them about gasket kits. I know they don't have floats in stock and last time I looked the replacement carbs were super expensive but they may have gasket sets. If I recall correctly, the jet well gasket is flat and not so thick, but a small o-ring may work.

Forgot to add:
Harbor Freight sells a non-contact RPM meter for not much money. Very handy for all types of engines/motors/driven machinery that do not have a gauge or meter on them.

I just got Hz/voltage panel mount meter from a vender on E-bay for about $25 shipped. He is in Georgia and sells all sizes of gen set heads and parts. Use this one on a 20Kw 2-53 Detroit that has a variable throttle so loaded running Hz is @ 60 +/-and no load is 61-62 HZ or so. Seems to work fine.
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Old 07-23-2018, 01:00:22 PM
nezwick nezwick is offline
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Default Re: MEP-016A 4A032 Keeps Shutting Down

Thanks for the info about the no-contact RPM meter and source for gauges. I suppose I should probably get a better multimeter that can read Hz if I plan on doing any more gen sets.

And yeah, I would never run ethanol gas in this, or any of our small engines for that matter. One of the benefits of having a farm tank, we just get bulk deliveries of ethanol free 91. There are no gas stations within 25 miles of me that sell ethanol free at the pumps. I think I have called every single one.
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