Mep-803A needs replacement engine

[Blackbear]

Well, I have a mep803-A that has the original onan 4 cylinder engine, that's now seized and I will need to replace it, any ideas where I can get one to swap it out?

 

[DieselAddict]

How much of your wallet do you need to have leftover? The price for a LPW4 as a good condition runner can be pretty high.

Edit - sorry. No eBay links. My bad.

Search ebay and you'll see engines are not cheap. More than I pay for nice fully running generators.

Personally I think your best bet is to buy one that looks beat to crap at an auction and use it for parts. That in my opinion will be your low cost option.

 

[davidhdale]

Dont know if this is what you need whiteowls has a 4cy. 6 hp engine 375. Web site whiteowls military surplus kinston nc

 

[Suprman]

I have seen several that are seized due to water getting in the exhaust and rusted stuck over time. Sometimes you can take it apart and free it up.

 

[DieselAddict]

Dont know if this is what you need whiteowls has a 4cy. 6 hp engine 375. Web site whiteowls military surplus kinston nc

I took a quick look through their online inventory and I didn't see any engines. The LPW4 is more of a 20hp engine.

 

[Blackbear]

That's exactly it!

 

[Blackbear]

I have seen several that are seized due to water getting in the exhaust and rusted stuck over time. Sometimes you can take it apart and free it up.

thats what happened, trying to get it free now.

 

[DieselAddict]

Soak the cylinders with PB Blaster or your favorite penetrating oil and gently work it back and forth. Hopefully it I'll break free.

 

[jamawieb]

I just had a unit with the exhaust flap missing and the motor was seized. Took the injectors out and poured transmission fluid into the cylinders, left it for a week and freed it up. Make sure your outside and away from everything with the first startup, because when it starts, it throws junk way up into the air.

 

[Blackbear]

I just had a unit with the exhaust flap missing and the motor was seized. Took the injectors out and poured transmission fluid into the cylinders, left it for a week and freed it up. Make sure your outside and away from everything with the first startup, because when it starts, it throws junk way up into the air.

Thank you, will now hope for the best.

 

[Guyfang]

Send Daybreak a PM. He might have one.

 

[Guyfang]

I just had a unit with the exhaust flap missing and the motor was seized. Took the injectors out and poured transmission fluid into the cylinders, left it for a week and freed it up. Make sure your outside and away from everything with the first startup, because when it starts, it throws junk way up into the air.

Let me add to this. Remove the injectors. Insert wonder fluid to loosen things up. Let soak for a few days. Then turn the fan by hand, back and forth to get things loose. THEN crank the engine over for a short time, with the injectors still removed. This is where jamawieb's warning comes in. Stuff WILL be evacuated from the cylinders at a very high rate of speed and pressure. It can hurt you. So be warned. It also doesn't taste worth a darn.

 

[Bmxenbrett]

I believe theres one localy for sale to me on craigslist.

 

[Daybreak]

Send Daybreak a PM. He might have one.

Howdy,
Nope, no DN4M engines here.

I have a new in the crate DN2M engine ready to go.

 

[novaman]

I just got an 803 from govplanet said cranked but doesn't start. I assumed fuel issue. when I got it and cranked it fuel was pouring from every hose. So I felt pretty good that it was a fuel issue. But it did sound a little different from the others while cranking. So i fixed all the hoses and tried again. but no cigar. plenty of smoke from the exhaust but no even try to fire.
opened the oil fill while cranking and it was as bad as the exhaust. so my guess is it was froze up but they broke it loose and just let the rings shatter themselves to pieces. I'm probably going to try the above recommendation and look for a beater and take the motor from it. seams like the $300 beaters are still selling for way too much now a days. Are people not aware of what they are buying and just burning themselves or who the **** is buying up all the parts units and then not selling the parts? I'm going to pop the head off and take a look at the cylinder walls if there not super bad MAYBE ill ball hone it and toss some rings in it but who has the time. not me these days. newborn ...

 

[Guyfang]

oday, I looked at a place here in germany that sells army crap. They had at least 20-30 DN2M engines, and in the backround i saw about that many DN4M's also. I sure wish I could get a hold of them. But he shipping from here to the states would kill me.

 

[novaman]

In my experience id be taking this to the sunnen hone.
Im going to try to hit it with a ball hone on a drill to see if i can get the big scale off with the pistons still in it. if it looks promising then maybe ill tear it down
https://youtu.be/rwGCVnyWaZo
https://youtu.be/pN6gZjuo7ig

 

[Guyfang]

Give it a try. Wont cost you much, and then you can give it a good eyeball. You might just get lucky.

 

[eatont9999]

I dunno, it looks pretty nasty. I guess it depends on how bad the rust is on the cylinder bore and if any crosshatch is left. It may need to be bored out and larger rings installed. Before you go through that expense, make sure the bottom end is not damaged. All it takes is water in a cylinder and someone cranking it not knowing, to do some damage.

Not sure if these engines have wet or dry liners but it looks to me like wet liners. You could replace those if the bore needs to increase past what oversized rings can go to.

 

[Daybreak]

Howdy,
You might want to go thru this entire thread.

Picked up 3 MEP-802A gensets and will be documenting making them all runners here

He is very detailed in what he did to the cylinders. Like leaving ATF sit in them, or a product called Evapo-Rust. It really did a clean-up on the rust.