I just got a MEP 002a from GL, it was one of the more tired ones out of Pa last month. The recent WIKI posting on these is very usefull. Went though the usual filter stuff, tank cleaning. I was spoiled with my last year's purchase of a mep 701a, which had over 400 hrs, but started and charged with just oil, fuel and battery. This new one is another story. Needing sheet metal work, starter rewiring and selector switch unstuck. Still don't know if it makes power. The fuel tank had the smell of stale gasoline. To make it short, the IP shaft turned out to be snapped. I cranked it over with glow plugs out after doing the oil & fuel filters, but before I freed up the IP. When it did not send fuel to injectors, I worked the throttle linkage and tried to unstick pump as outlined in the Wiki. I will never know if the shaft was broken before or after I spun the engine. Looking for a replacement pump. On the bright side, I now know my way around this rig a lot better than the one that worked from the start.
I just got one with 2.2 hours on it couldnt get it to start had fuel to the IP but nothing to the lines one of our members here gave me a list of things it may be and low and behold got her started today. Turns out the fuel shut off solenoid rod was stiff from sitting so long a little PB blaster and it fired up right away after getting the rod to move freely.
The injection pump is prone to seizing the control collar mechanism, either the collar seizes on the piston(collar slides to regulate injected quantity) or the shaft seizes in the precision bore. The precise fit of the shaft in the bore is what seals the 8 PSI of fuel from leaking. It doesn't take much to seize this shaft.
If the collar is seized, forcing it with the control lever can break the pawl. The control shaft and pawl can be removed with the injection pump installed, saving the timing procedure. It is difficult to access the two screws and more importantly, bend the locking tabs out. And it takes even more patience and a dental mirror to reinstall the control lever and get the pawl into the slot on the control collar. It can be done. Use grease to retain the pawl in the control lever shaft, it too is a precise fit.
When the generator (002A) is consuming 1/2 gallon per hour, the stroke length of the injector pump is about 0.015". The maximum stroke is about 0.045". Just keep that in mind when working on the injection pump. Clearances are on the 1/10,000th of an inch or less. The injection pump doesn't react well to dirt.
Lessons from my 002a
