Maybe in the market for a nhc250

[505m818]

I just got an m818 in non running condition. It had a small hole in the oil pan below no.1 cylinder. Basically I knew it wasn’t a rod so I got it started and it ran fine minus the huge oil leak. I took the pan off to repair the hole and found tons of quarter to 50 cent pieces of the cylinder liner. Basically where the liner hanges down below the block is all broken off flush with the block. My plan was to just replace no1 piston and liner but…. Should I be pricing engines? Anyone know where I can find one?

 

[Elijah95]

Wes has some good options on the table, I’d recommend booting the wheezing 250 to the curb and toss something in that’ll actually last


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[Bill Nutting]

I hear some say they don’t like the NHC250. I’m wondering why. In 2019 I was in Utah and had to make a mad dash home to Michigan. I put my foot on the floor, only stoped for food, fuel and a little shut eye. I beat that engine for two and half days at full throttle. If these are bad engines, it’s lost on me…

 

[98G]

I hear some say they don’t like the NHC250. I’m wondering why. In 2019 I was in Utah and had to make a mad dash home to Michigan. I put my foot on the floor, only stoped for food, fuel and a little shut eye. I beat that engine for two and half days at full throttle. If these are bad engines, it’s lost on me…

Concur. I just drove one KS to IL to NM , dragging a loaded semi trailer.

@EricTheHoly may have a take out in the not so distant future.

 

[WillWagner]

There are enough take outs around. Look up the belly and see if the cam is damaged. If you can see the lower liner receiver, look to see it is not all beat up. If both of those are serviceable, pull the head and see what happened. Liners don't just break, something happened. Possible over heat, you can look at the parts of the liner in the pan to determine that, there will be heavy score marks and usually metal transfer to the liner if it stuck a piston. I have seen keepers and retainers pop off/break away from the valve and the top of valve stems break off. When that happens, the valve follows the piston down to BDC, falls out of the guide and when the piston starts it's upward travel, the valve causes the piston to cock in the bore and you get the type of parts in the pan you have. The valve looks like a pretztel and is embedded into the crown of the piston, looks kinda cool! Pull it down and see what happened, we like pictures!

 

[Nomadic]

In for more pics of carnage.

 

[505m818]

These pics are from under the oil pan. Hopefully you can see the sleeve broken off

 

[Bill Nutting]

There are enough take outs around. Look up the belly and see if the cam is damaged. If you can see the lower liner receiver, look to see it is not all beat up. If both of those are serviceable, pull the head and see what happened. Liners don't just break, something happened. Possible over heat, you can look at the parts of the liner in the pan to determine that, there will be heavy score marks and usually metal transfer to the liner if it stuck a piston. I have seen keepers and retainers pop off/break away from the valve and the top of valve stems break off. When that happens, the valve follows the piston down to BDC, falls out of the guide and when the piston starts it's upward travel, the valve causes the piston to cock in the bore and you get the type of parts in the pan you have. The valve looks like a pretztel and is embedded into the crown of the piston, looks kinda cool! Pull it down and see what happened, we like pictures!

If this happens, can the engine be saved or does it become scrap?

 

[simp5782]

Inframe with new liners. Best to go thru and do it all.

 

[US6x4]

My neighbor said he put 2 million miles on his small cam but he said you have to be smart with your foot to keep from burning a piston.

 

[WillWagner]

If this happens, can the engine be saved or does it become scrap?

As long as the block isn't beat up at the lower receiver and the cam is good, you can one or two hole it. But, it has been a bit, but I do not remember if you can mix 3 and 4 ring pistons. New stuff, from Cummins, will be 3 ring type. There might be aftermarket parts made that are 4 ring.

Edit, looked at the pics, the block looks like it wasn't hit. Wonder what got in there> Roll the engine over to put the piston at BDC and have a look at the skirt to see if it is scored.

 

[505m818]

Had a local mechanic pull the liner today. Yes it defiantly ate up the liner!!!! But the rod bearing push tubes and rod all looked great so in with another and let’s see what happens!!!

 

[Nomadic]

Those are big jugs.