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'Truth table' is a term from logic circuit design. It applies to anything that has a defined set of finite states and multiple variables, like an ignition switch on a car, S2 on an MEP-002A, or, yes, logic circuits. The term comes from the idea that Boolean variables are either 'True' or...

No puddle anywhere? Then it all went through the engine and was burned. Fill the crankcase back up, start it, and do a blow-by check. If it's burning that much oil then I expect a lot of blow-by. If so, you've probably got broken rings, a cracked piston, scored bore(s) or possibly several of...

What he said - as long as there's a solid shaft connecting the gen head and the crankshaft, if it's a four-pole gen head (an MEP-002A/003A is), then 1800 RPM = 60.00 Hz and vice-versa. A quartz crystal based frequency counter (like a Kill-A-Watt) plugged into the convenience outlet is...

Temporarily (for two years now...) my MEP-002A sits on the corner of the parking pad beside the house. Sitting on pavement makes it easy to keep debris out from under/away from it and it dries out quickly after a rain. The generator is oriented so that the control box panel faces almost due...

That's because JPx is not a fuel specific to Diesel engines. JP, in fact, stands for Jet Propellant. USAF used to use JP4, USN used JP5 (which was supposed to be less dangerous on shipboard). JP8 is the NATO standard 'One Fuel to Power Them All' adopted in the 1980s - everything from backpack...

GMC deuce people certainly want special parts like the air pack and PTO from it, as well as common wearing/damaged components like the radiator and gas tank. I'd part it out. Probably save the prime mover, trans, and transfer case if they're decent even if nobody wants them right now. You can...

A Kill-A-Watt meter is cheap, works well, and has many, many other uses once you've got it around. One thing it does very well is plug into the convenience outlet (or near the load) and measure the frequency.

If that pony motor uses an off-the-shelf Wico magneto you're likely to be able to find something that works for points - they're very common. Also try people who work with antique farm tractors, as basically all of them used magneto ignition.

As NDT said, gensets that big were generally stationary-mounted in WWII. A pony motor for starting suggests that it was standby power (able to bootstrap - you wouldn't see this in a lot of stationary applications) and the capacity suggests something like power for a permanent hospital or all of...

The overtemp switch is just that, though - a switch that triggers a high-temperature shutdown. If you're serious about monitoring oil temperature, the easy way would be to screw a sender into the oil filter drain plug hole and mount a gauge for it. The system is hugely overdesigned, though...

Airflow management is pretty simple on these: Lots of air goes in the fan on the front and is mostly ejected out the cooling louvers above the batteries. There's also a small air intake quantity into the air filter and the control box end of the generator, and a warm air exhaust at the...

In summer I've seen mine open to a maximum gap of about 1" at 75% load and 100 F. If you're not working the generator fairly hard they generally won't open more than 1/2 inch over half an hour's runtime. In a quick 5-15 minute run check they generally don't move. If you've seen the size and...

I subbed this thread when Zout started it, just because I knew it was going to be stupid amounts of fun to watch (and he takes great pics). I've read religiously, but lurked all along just because I didn't have anything useful to add. Well I still don't have anything useful to add, but just...

An excellent point! I have, among other things, an assortment of old Chevies. They have the same sort of metal compositions in the transmission that the deuce transmission has. As gear oil formulations have changed, there have been periodic 'panic attacks' among old car people until somebody...

You've got a few different things going on here that keep there from being one correct answer to this question: 1. Yes, deuce engines are an old design, most are well-used, and tolerances aren't as tight as they would be on a newer engine design 2. Yes, old elastomer seals get stiff/dry out...

He's not really going to 'de-sulfate' it, what he's going to do is blast so much current through the short between the plates (which may or may not be sulfate) that it explodes/vaporizes the short and allows the cell to work normally again. In so doing, you can end up with a lot of little...

AFAIK, the only differences between the MEP701A and the MEP-016B are in the wiring for the cooling fans on the ASK housing. The DC charging circuit should be exactly the same, as should be fault testing. Section 4-25 in TM 5-6115-615-12 covers quick diagnosis. See this thread for more detail:

What is rated output on a PE-75? It can't be much, but I'm guessing 1 KW or so? That's a really clean PE-175 you have there - probably the nicest unrestored one I've seen.

If a diode let go like that, I'd be suspicious of a short somewhere. Check all that wiring over carefully for rubbing points against metal, crimped spots, etc. I believe the relays are double-headed, so you just flip them end for end. And yes, the ability to do easy component-level repairs...

The wiring runs from the float switch to a relay in the control box, then to the solenoid. The wiring on these things is not as well protected as it might be - check carefully for exposed conductors and loose connections. Your lowish voltage is also suggestive of a wiring problem. The relays...