I bought the in my sig and made it 10 miles and lost oil pressure. This truck was running warm when it happened. Yesterday I pulled it out and tore it down.

My findings were: thermostat in backwards(cause of the heating problem), all bearings are done( no copper left on the bearing halves). On the bearings it looked like something nasty went thought #2 main bearing.

This truck has 292k kliks on it.

Now on the good side: still a crosshatch on the cylinder walls There is no scoring to the crankshaft from the bearing failure. From what I have heard of these engines this is not common.

Could the thermostat being in backwards have caused the bearing failure?

As I took apart the engine I noticed that the injection pump has been played with, looks like the smoke screw cover has been removed and put back on. The idle screw has been adjusted.

Do I just take my time after I have it back together and have guages installed and work the pump to crank it up?

I will take pictures later on and post them for you to see.

Sorry for being so long winded, but I just wanted everyones opinions.

 

I don't think the thermostat and the bearing are related. Usually an overheated Cummins will wipe out #5 & #6 piston, and the bearings will be unharmed. As you said, something nasty went through there. Question is, how did it get there? What kind of oil filter was on the engine? I would inspect the oil pump closely and replace the oil cooler with a new one when you put the engine back together.

Definitely put gauges on before messing with the pump. I don't think any of the problems you've had are related to overfueling.

 

There was a Lubrefiner filter on there. As for #5 + 6 being wiped out, are you talking about the crown of the piston or the skirts? There was debris (silicone, old gasket) in the oil pickup.

So far for a list I am looking at putting in this engine is: bearings, oil pump, rings, stat, oil cooler, ARP studs, complete gasket set

 

No, I mean the full flow filter. What brand was it? None of that crap should have made it through the full flow filter.

The pistons stick and score the cylinder walls on a bad overheat.

I'd leave the rings alone, just put the pistons back in the same holes (or don't even take them out). These engines routinely have good ring seal at 500k miles.

 

The brand name of the oil filter was Lubrifiner(sp?).

I did see some vertical scoring (very light) in the cylinder walls, so I figured to use a honing stone and remove the marks. I figured that if I saw that it would be safer to replace the rings.

I don't know the history of this truck, and don't believe much of what I heard from the PO. I am in there and don't want to pull this out again. Before I pulled it out it was smoking, not black smoke, but bluish smoke.

 

I am actually gonna go and pull the pistons and see if the rings are moving freely in the lands of the piston. Better safe than sorry!

 

any damage in the front cover maybe that kdp got you or like almost happened to me lost a bolt on front cove found pieces of it in oil pan
just something to check out

 

Huh, I didn't know they made full flow filters, I thought they were only into bypass stuff. If you still have it, cut it open and see if the element is torn or cracked.

Vertical scoring is not uncommon and if you can't catch it with your fingernail I would not worry about it.

If the rings aren't stuck they will seal better than a new set in the old bores. It's better to leave them alone if they look happy.

 

Well took out the pistons and #1 and #6 are done - they are leaving piston skirting on the cylinder walls. #2 - 5 are fine and the rings move freely. I am gonna try tomorrow night to use the cylinder hone and get the aluminum off the cylinder walls with using brake cleans and trans fluid as the cutting fluid.

I had checked the KDP earlier and it is still in its home. I will fix it before I complete the engine.

I will cut open the oil filter tomorrow. And tomorrow I will get the bad news of how much this is gonna cost me, direct from Cummins(dealer is a hour away).

 

After you hear that you might start looking for a used engine. Too bad about the pistons.

 

The problem is that there are no used engines around right now in this area. I have looked for the last month, along with the father in law. I am gonna take my chances and see what it is going to cost for just two pistons and rings, and the rest of the stuff needed.

There are a few other avenues to go down for the pieces too. I took pics but forgot the cable for my phone at work, so I will upload the pics tomorrow.

 

Well got the prices today, pistons aren't that bad in price! The gaskets from Cummins is unreal though. Jobber prices for the gaskets are 1/4! Should have all the pieces on Thursday and have the engine back in on Friday. At least that is the plan!

 

Here is the pic of the piston. The skirt of the piston on the right got hot and left some metal on the cylinder walls. The rings don't move freely in the lands. As I mentioned #1 and #6 were this way. #6 was by far the worst.

This sure shows that a little knowledge is Dangerious!

 

there was a low km engine in one of the papers lately,could have been the bargin hunter for 2500,but it sounds like u ave it covered. I found my local caseih dealer is alot cheaper for parts than cummins. Good luck

 

Well I have busted my hump this week and got the engine back together! Got the engine in the truck tonight.

Just a side note: It is a pain in the edit putting the engine in with a front end loader, but it does work!

Got the beast running!!!!

I just had one cylinder that the valves weren't set right, but other than that it was good!

Overall the cost and the time wasn't that bad. If you take the time to price out everything and look around for the parts you can rebuild for a not bad price.

Now on to my next headache, overcharging . Gonna have to go through the wiring mess that the PO has done and work from there.