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So after more measuring, I’m getting a 3.412” across the thrust face of the piston. Looking in the manual, standard is supposed to be around 3.384”, then add the .75mm (.029”), gets me to the above number. These are definitely .75mm oversize pistons. my conversions might be a bit off going from...

yes I did, got a few things coming from them that I couldn’t source locally

Do you know if they make them bigger ? I’m gonna have to bore out the block to get rid of pitting, especially on cylinder #2.

They didn’t match either when I looked

I pulled the pistons and they say 751-42670/0.750/5 And 72 10-10 Are these oversize or stock pistons ? After measuring im leaning to 10 over. what do you guys think ?

I tried the mystery oil, it would help but but then the next day back to square one. just pulled piston number 2, the cylinder bore has a few rust spots, and I’ll post a pic of the cylinder. The cylinder leak down was the final nail in the coffin for me, especially listening to the air escape...

So got home from work and made the adapter for a leak down test. All 4 cylinders at tdc compression failed, can clearly hear air escaping from the oil fill port on each. Guess the rings are shot I guess it’s rebuild time. Can anyone recommend a good kit to get ???

compressions all good. going to do a leak down test tonight just as extra insurance.

The saga continues. Took apart the oil pressure regulator, looks decent. Only thing is I swear I read in another post on here there’s supposed to be some kind of steel ball that’s in here ? Not seeing one, also the spring looks deformed on one end ? Is this normal ?

these rats or whatever it was really made a mess of things. The worst part is the smell, still trying to air it out. I really hit the jackpot with this unit

Hopefully it was just stuck rings and the oil got them loose and they’ll behave from now on. now to deal with all the wires chewed by the rats that had a palace set up in there lol.

I think it’s a faulty fuel pump, #3 fuel pump in 1 and 2 spot causes fuel to come out of it while cranking the engine.

Hey guys so finally did a compression test yesterday, # 4 was around 450 psi, 1,2 and 3, not even registering. poured some oil into each cylinder and let it sit over night. holy crap, every cylinder almost at 500 psi right now. I couldn’t find a compression adapter for this engine, so made...

Cool, figured it was a typo. Glad to confirm. Thank you

Yes it did

The fuel pumps work ok, when I press the spring, they pump out fuel. curiosity got the best of me lol, took out one of the known good pumps from #3, zip tied that shim pack together and measured it. 1 and 2 are no where close to this measurement. Somebody definitely messed with the shims. Gonna...

Looks like these pumps are a Delphi ? Maybe there was another manufacturer they used ?

Sorry about that. I only have one other thread. https://www.steelsoldiers.com/threads/mep-803-fuel-pump-shimming.213554/ That one was about the shims for the fuel pump. I made this one for the length of the fuel pump body. Figured they were two different topics. again sorry, didn’t mean to...

Somebody was messing with the fuel pumps, looks like 1 and 2 had shims added. I went and pulled the injectors and took them apart. 3 out of 4 were pretty rusty inside. Getting to the point where I’m just gonna junk this whole damn thing, who knows what else is wrong with it. so much for the...

yes I did, it compresses by hand and fuel comes out. Looking at it more, it seems like there’s too many shims for this pump. I’m gonna take #1 pump off tomorrow and measure those shims. what’s The best way to get the pin aligned on the pump with the fuel rack when putting it back in ? I’m...