Coulda spun a bearing.

I've seen a few older Cummins spin bearings when they break in nicely (100K miles) and then get a power adder. Within a few thousand miles it's knock-knock-knock.

It shouldn't cost maybe $3k to fix a bearing and $7k to fix a melted piston. If you do the work yourself, and the machine shop isn't too greedy.

You have to pull the motor to do a bearing.

Merrick

 

Hey just do some hand sanding and a little duct tape you can fix it? Good kill. What do you do? Drag home a house? Vette bashing?

$10k, what else was broken?

 

How did you check the injectors? Did you cut them out manually while the truck was running? Have you noticed that your oil pressure has changed since the knock? Valve noise and bottom end noise to me are quite different.

 

I Put In My Injecter Set I Run In The Summer , No Didnt Try To Cut Them Out Manually Good Thinking I Will Try That ,no Mis In The Motor And The Oil Pressure Has Not Changed, Iv Been Drag Raceing For 15 Years ,gas Cars And I Have Seen Weird Things And This Is A Sound That Is Just Like A Rod Knock Its In The Top And Front Rockers Are Good Lash Is Good .yes The Two Sounds Are 'quite ' Different I Know What It Sounds Like I Just Cant Believe What Its Doing .im Going To Think About It For A Day Or So , I"ll Take The Head Off And Look And Then The Oil Pan. Theres No Blow By Like A Smoked Piston Would Make .its Not Smokeing Out The Ex Pipe . Wish And Hope Its Something Different Then It Sounds Like Thanks For All The Replys Ther Helping Me Think

 

DD, I don't know if you can rent one of these or if it would even fit through the injector hole but it might be worth a try before you pull the head. Maybe you know a plumber that has one. http://www.ridgid.com/Tools/SeeSnake-micro

 

Jack the engine up a couple of inches and drop the pan

you may want to get your oil analized that can see a lot too

You can rebuild yourself for about 3k if you go back stock I just did it 6 months ago

 

Good point, a oil analysis should be able to at least point you in the right area to look.

 

I have worked on large industrial diesel engines that had what I would have sworn was a rod knocking. Most of the time it turned out to be a failed nozzle or injector dumping un atomized fuel. What does your smoke look like?

 

.7" diameter MIGHT fit-- but it would be close.

That has to be one of the coolest tools I've ever seen. Easily a million uses for that thing!

Thanks for posting that.

Justin

 

What were you doing to melt that piston?

Jim

 

You're welcome Justin.

 

well i got the head off and hole #6 has some marks down low on the right and left sides of the bore and i can put the piston to the top and move it in the bore might be that it broke a ring top of the piston looks good what do you think

 

Are you able to move it side to side or front to back?

 

#6 always runs the hottest!

 

we've got an engine torn down at school that melted #5 but 6 is just fine.