devilphrog
Member
- 93
- 5
- 6
- Location
- Melbourne, FL
Hi all, name is Nick and I'm based in central FL. I purchased a couple of MEP-803A generators, 1 with 7k on the clock, and one with 9k (reset 2010 and put directly into storage, don't think MCB Albany changed the Hobbs meter out, but it's pristine and I got it for a smoking price, considering what these units are going for now. I don't think anybody caught the rebuild tags in the photo, and was scared of by the Hobbs meter).
The issue I'm having is the 1999 7k hours unit (which I obviously overpaid for, and was in way rougher shape than I thought), was having serious blowby at delivery. Because it was a GP unit, it was run, so I ran it as well. Without a load, the blowby was high enough enough to blow the dipstick out and smokes like a mother.
I initially thought it was a busted ring, and I tore it down, but despite a couple small rust areas on the cylinder walls from sitting (honed out no problem), I've got 2 busted pistons. They are broken between the ring lands, but luckily, they didn't score the cylinder walls.
I think they initially cracked when GP was doing their inspection videos, and I finished the job with 10 minutes of running to try out my home brew load bank of 4 5400w dryer elements, With 2 run in series for a total of 12.5 kw. The unit did handle the load, but was in total mosquito control mode during that quick test, as it was an "eff it" moment as that grey/white smoke was a telling sign of something being amiss.
Something to consider when they hook up the NATO plug and "let 'er rip" in retrospect, rather than dumping oil down the injector holes, soaking, hand cranking, and working up to a dead crank and then start.
In researching the tech pubs, both the DN4M IPC and the Lister Petter IPC, I'm getting differing piston part numbers. The unit has 751-42670/5 pistons installed, and L-P is calling out a 750-41610 in their catalog for latest production.
Like the other forum with pclausen questioning the /5 and being a standard bore, I dropped a set of standard rings in the bores and have .001" clearance, so I'm guessing I'm not oversized here and I still had decent cross hatching in the cylinders before I blasted the ridge with a hone to pull the pistons.
Long story short, does anybody know of a source for a 751-42670/5 pistons or know what else will work? The big auction site has a couple pistons available but I want to make site to get the right part.
I'm not interested in paying $250 a piston as well for a reboxed L-P part?
The issue I'm having is the 1999 7k hours unit (which I obviously overpaid for, and was in way rougher shape than I thought), was having serious blowby at delivery. Because it was a GP unit, it was run, so I ran it as well. Without a load, the blowby was high enough enough to blow the dipstick out and smokes like a mother.
I initially thought it was a busted ring, and I tore it down, but despite a couple small rust areas on the cylinder walls from sitting (honed out no problem), I've got 2 busted pistons. They are broken between the ring lands, but luckily, they didn't score the cylinder walls.
I think they initially cracked when GP was doing their inspection videos, and I finished the job with 10 minutes of running to try out my home brew load bank of 4 5400w dryer elements, With 2 run in series for a total of 12.5 kw. The unit did handle the load, but was in total mosquito control mode during that quick test, as it was an "eff it" moment as that grey/white smoke was a telling sign of something being amiss.
Something to consider when they hook up the NATO plug and "let 'er rip" in retrospect, rather than dumping oil down the injector holes, soaking, hand cranking, and working up to a dead crank and then start.
In researching the tech pubs, both the DN4M IPC and the Lister Petter IPC, I'm getting differing piston part numbers. The unit has 751-42670/5 pistons installed, and L-P is calling out a 750-41610 in their catalog for latest production.
Like the other forum with pclausen questioning the /5 and being a standard bore, I dropped a set of standard rings in the bores and have .001" clearance, so I'm guessing I'm not oversized here and I still had decent cross hatching in the cylinders before I blasted the ridge with a hone to pull the pistons.
Long story short, does anybody know of a source for a 751-42670/5 pistons or know what else will work? The big auction site has a couple pistons available but I want to make site to get the right part.
I'm not interested in paying $250 a piston as well for a reboxed L-P part?
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