MEP-002A, will Start, Run then dies....any suggestions?

[1FAST4]

One thing to note: The IP rebuild instructions in the generator's TM are incorrect, they are for the PSU injection pump, not the Ambac M-50 that you have, but I have the instructions and diagrams for the M-50 if you need them. I assume the Ambac manuals etc. are also available in the TM section, but not positive.

Ray,
I'll happily take any instructions, guides, diagrams, pointer or anything else you would like to provide that would be helpful. Also, in this post of yours (Click Here) you mentioned you made a few tools that "made it a lot easier" for you...I'm pretty handy with a Mig welder and Plasma Torch so if you could send me any Pic's, descriptions and/or drawing of the tools you made....even a stick figure drawing on a nappkin would work, it would be greatly appreciated.

Sending you a PM with my contact info now.

 

[1FAST4]

Ray,
I'll happily take any instructions, guides, diagrams, pointer or anything else you would like to provide that would be helpful. Also, in this post of yours (Click Here) you mentioned you made a few tools that "made it a lot easier" for you...I'm pretty handy with a Mig welder and Plasma Torch so if you could send me any Pic's, descriptions and/or drawing of the tools you made....even a stick figure drawing on a nappkin would work, it would be greatly appreciated.

Sending you a PM with my contact info now.

Ray, PM sent

 

[Ray70]

Great news that you can fabricate things. I will send info to your email, but for others here, the most helpful tool I made was to take a 5/8" deep socket and cut out about 1/3 of it, essentially creating a slot all the way down 1 side ( looks like an oxygen sensor removal socket ) then welded the socket to a large C-clamp ( 8" I think ) This tool makes removing and installing the 2 small retaining clips that hold the bottom spring onto the plunger. With the large hex cap on the hydraulic head, use the clamp to compress the spring, then go in through the "window" cut in the socket with a magnetic pick to retrieve the clips.
Press against item #4 to compress the spring #3 then pick out #9, allowing the gear to come off the plunger and giving access to the plunger guide, #11 which in many cases will either be split in half ( if your IP is not delivering any fuel ) or if you engine runs but is hard starting, runs poorly, stalls or gets hot quickly, it may have skipped on the plunger, causing it to be orientated wrong.

 

[2Pbfeet]

Great news that you can fabricate things. I will send info to your email, but for others here, the most helpful tool I made was to take a 5/8" deep socket and cut out about 1/3 of it, essentially creating a slot all the way down 1 side ( looks like an oxygen sensor removal socket ) then welded the socket to a large C-clamp ( 8" I think ) This tool makes removing and installing the 2 small retaining clips that hold the bottom spring onto the plunger. With the large hex cap on the hydraulic head, use the clamp to compress the spring, then go in through the "window" cut in the socket with a magnetic pick to retrieve the clips.
Press against item #4 to compress the spring #3 then pick out #9, allowing the gear to come off the plunger and giving access to the plunger guide, #11 which in many cases will either be split in half ( if your IP is not delivering any fuel ) or if you engine runs but is hard starting, runs poorly, stalls or gets hot quickly, it may have skipped on the plunger, causing it to be orientated wrong.
View attachment 939285

Do you have a photo of your spring clamp tool? Just curious. I'm visualizing something like a better version of a valve compression tool.

All the best,

2Pbfeet

 

[Ray70]

I could take a picture when I get home from work tonight. Essentially it works on the same idea as a valve spring compressor, only with a screw clamp rather than a squeeze clamp. In the Ambac service manual they basically show a tube with a hole cut in the side being used in an arbor press to do the same task, but I found it easier to clamp the pump in a vise ( I clamp it upside down by the large hex cap that covers the delivery valve ) and use the modified c-clamp.
Only reason I welded the socket directly to the clamp is to keep everything aligned, so you don't need 4 hands to hold everything in place.

 

[2Pbfeet]

I could take a picture when I get home from work tonight. Essentially it works on the same idea as a valve spring compressor, only with a screw clamp rather than a squeeze clamp. In the Ambac service manual they basically show a tube with a hole cut in the side being used in an arbor press to do the same task, but I found it easier to clamp the pump in a vise ( I clamp it upside down by the large hex cap that covers the delivery valve ) and use the modified c-clamp.
Only reason I welded the socket directly to the clamp is to keep everything aligned, so you don't need 4 hands to hold everything in place.

@Ray70 Thanks! The description above helped me understand the whole process a lot better as well. Thank you.

I have a vague memory of working on an engine with a set of similar split retaining rings. What I chiefly remember was what a pain it was. Herding cats doesn't do it justice.

All the best,

2Pbfeet

 

[Ray70]

Yup, they work on exactly the same principle are a pair of valve spring retainer, just 20X smaller and 100X harder to grab with ANYTHING!
The trick I found was to pick them out with something magnetized, like a small pick etc. just don't drop one and loose it in the mess on and around the workbench... , been there....
But putting them back in is a whole other chore, magnetized tools won't let you release them and drop the into place, so I use a pair of tweezers and just drop them into the cavity, then lift unscrew the clamp slowly, watching to see if they fall into place as the spring and retainer come up around the plunger.
Just don't drop one into the space on the outside of the spring....

 

[2Pbfeet]

FWIW: I have used reverse forceps, also known as Dieffenbach for those fiddly items. For me, the forceps can do the holding while I do the maneuvering. (Less of "pat your head while rubbing your tummy thing" for me.) These days you can get them in all sorts of sizes and strengths. For those with better coordination, I am sure that it is probably unnecessary, but I need all the help that I can get...

All the best,

2Pbfeet