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Thread: MEP-005 Fuel Injection Pump

  1. #71
    4 Star General Guyfang's Avatar
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    WP_20180319_17_48_49_Pro.jpg

    WP_20180319_17_49_07_Pro.jpg

    Ray, does your injector pump look like this? Your throttle cable is hooked to the back side arm of the IP, the front arm is supposed to be wired to the front of the set. The front arm is only used on the precise set.

    Edit: Also, I have seen the connection between the two arms come loose. Take out the three screws and unhook the fuel inlet line. remove the top. Pay close attention to the "O" ring. It can fall out, and you might not see it. Check/test the check valve, or soak it in carb cleaner. When you replace everything, once again pay attention to the "O" ring, that it doesn't fall out of the top.
    Last edited by Guyfang; 05-20-2019 at 13:45.

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    Thank you Guy, yes that's what I have. The lever is not wired up at all, so I'll take care of that. First I'm going to test the solenoid, if that seems ok I'll take off the cover and see if everything inside is moving freely and l'll clean the check valve while I'm in there. Might be a week or so before I get to it, but will let you know how I make out.

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    4 Star General Guyfang's Avatar
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    Test the solenoid (L1) in place. if you do not get 24 volts at one terminal and 24 back out to ground, the L1 is suspect. I have seen about 4-5 times the L1 being bad, in almost 30 years of doing this. If you don't get 24 volts, just take a wire from the starter over to the L1. Should start right up. Wire # P80N16 should be the + 24VDC wire.

    When the front lever is not in the forward position, then the rear lever can not properly control the IP.
    Last edited by Guyfang; 05-20-2019 at 16:19.

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    Got it. I was able to check the solenoid last night ( in between dodging thunder storms ) and I'm getting 24V on the 2 wires. So opening up the IP cover is my next step.
    Looks like it has tamper resistant torx screws but I have a set somewhere!
    Thanks again!

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    4 Star General Guyfang's Avatar
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    Is the IP the same color as the engine? Maybe a replacement IP? As far as I can remember, the three screws were not tamper resistant.

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    The IP looks pretty old, stained and original, but anything is possible. I tried to take it apart after work today but struck out... They aren't tamper resistant Torx, turns out they are Pentalobe security bolts, 5 point ( not 6 point torx ) with center pin, so I just ordered a bit set, so progress is on hold for a few days!

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    Hello Guy, I received the penta lobe bits today and got the cover off the IP. the fuel solenoid and the control lever all seems to be working fine.
    What does not appear to be working correctly is the throttle lever and linkages.
    From the inside of the IP, the governor rod assembly and the dampener will move freely by hand, but the large hook shaped piece of steel called the throtle shaft lever in the TM does not move. Also, then adjusting the throttle, the lever that the cable attaches to moves freely, but the other arms next to it with the high and low idle screws does not move, should it?
    everything in there looks very clean so I'm wondering if its possible that someone could have turned the high and low idle screws and locked the linkage all the way down at low idle to prevent it from being started after draining all the fluids and removing the filters? I bought this machine from the national guard base and it appears it was functional up until the point that they turned it in.
    I'll play around with it more in a couple days, but any explanation as to what levers I should expect to move with the throttle lever would be appreciated.
    Thanks!

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    So tonight I had a few minutes to poke around on youtube and found a video of a guy rebuilding one of these pumps. It looks like for starters I have a throttle shaft problem.
    The plates with the high / low idle screws in it as well as the "Hook" inside the pump appear as if they should be moving freely with the throttle lever, but mine seems frozen, only the lever where the throttle cable attaches moves on mine, everything else seems stuck right now.

  11. #79
    4 Star General Guyfang's Avatar
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    Quote Originally Posted by Ray70 View Post
    So tonight I had a few minutes to poke around on youtube and found a video of a guy rebuilding one of these pumps. It looks like for starters I have a throttle shaft problem.
    The plates with the high / low idle screws in it as well as the "Hook" inside the pump appear as if they should be moving freely with the throttle lever, but mine seems frozen, only the lever where the throttle cable attaches moves on mine, everything else seems stuck right now.
    Sorry it took so long to get back. The time difference makes it harder, and then I have been out of the net for a few days. Minor OP and then since the doc took some of my butt out, (not much, but enough!) sitting at the computer is "tough" right now.

    Yes, that stuff should move freely. Try this. Remove the plate that lets you aline the IP. Remove the cap under the pump, on the end of the actual pump portion. Let the fuel drain out. Put the parts back on. Pour some carb cleaner into the top, where you removed the solenoid. Let it set a few days. Drain, and see if you get some movement on the levers. It could be simply the lacquer build up in the IP

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    Hi Guy, no worries, hope you are feeling better! I played with it for a few minutes yesterday and found that the throttle linkage was not actually "Frozen" but rather immobilized because the knurled cap ( used for sensitivity adjustment? ) was screwed all the way in. After backing the cap out, the throttle linkage now seems to move correctly.
    I don't know for sure if that is supposed to happen of if something else is not right, but backing the cap all the way out ( for now ) has restored throttle movement.
    From what I can see everything else appears to be moving freely. I'm going to give it one more look over, then put the cover back on and try it again!
    Maybe I'll also watch the video again and see if I can get a good look at the linkage movement inside the IP, while he is explaining things, just to be sure nothing else is wrong.
    Feel Better!
    Ray.

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