Update on engine analysis

[f350flatbed]

So I don't know how many are following this but I threw a rod and I have been working on the engine to see what happened. So I now have the heads off and the broken piston out. Three things of note:
1. There was a lot of particulate matter on top of the piston. It's the piston in the back on the driver's side.
2. The piston came out very easily and there doesn't appear to be any scoring on the cylinder wall about where the rings create a seal. There is lower down where it appears that the broken rod struck it. The top of the piston also appears to be in good shape, beside a large amount of deposits.
3. I removed the broken rod and the crankshaft still will not budge.
I will be taking the crank out at some point to see what's next.

Paul B

 

[hesutton]

How bad is the scoring? Hone take care of that........or will need a new sleeve? Do you have the other pistons and rods out? If so and the crank still won't move.. What are these deposits and where do you think they came from?

Keep us updated.

Heath

 

[f350flatbed]

I only got the one piston out for now. The deposits look like carbon and there also are some white powdery like deposits. The junk in the blown cylinder was like two tablespoons of black/brownish powder. The scoring isn't bad, I bet a honing will take care of it.

Paul B

 

[smoking89IDI]

Pics please!!
Was there any other deposits on any other pistons? How did the intake look?

 

[h2odrx]

When I took mine apart it looked like this.....

 

[Agnem]

Pictures if you can provide them! May help us analyze your situation.

 

[f350flatbed]

Sorry guys, I've been at work overnight keeping an eye on something. I brought the driver's side head in and took some of it apart. All I have here is a webcam, so no comments on the quality of the photos, please! Here are some shots,

http://www.oilburners.net/forums/vbpicgallery.php?do=big&p=467
http://www.oilburners.net/forums/vbpicgallery.php?do=big&p=468
http://www.oilburners.net/forums/vbpicgallery.php?do=big&p=469
http://www.oilburners.net/forums/vbpicgallery.php?do=big&p=470

The head looks to be in great shape. I am going to get both of them serviced and then I am going to try porting them. The white looking areas indicate high heat, right? And the two cylinders on the right are "wetter" looking, i.e. they look lubricated, whereas the back two are very dry. I read somewhere that if you are having oil come into the intake that it will go to the back pistons more and make them burn hotter. Well, the intake was positively nasty, so I'm pretty sure that's what was going on. But the piston is not burned or damaged (except on the bottom). Also, someone mentioned that if the rod breaks within 2" of the top that it was overreved? I was doin' about 55mph when this happened, unloaded, in 5th gear. Anyway, I am going to keep at it and see what all else I can find in the bottom of the engine.

Paul B

 

[smoking89IDI]

Well just by how clean that one cylinder is it looks like it was maybe burning coolant. Maybe it hydrolocked at one point but there was enough leakage to let the coolant pass but it may have bent the rod slightly and then broke later. Can you get a picture of the fracture, maybe we can see any beach marks to see if it was a low cycle or high cycle fatigue, or it could have been a ductile/brittle fracture(really fast break), from the one pic of the rod I can't tell if the line on the bottom is a beach mark or the heat treat/case hardening. Just my opinion and I could be wrong as I have been many many times before but from the pics that is what it looks like to me. Im sure others with more diesel failure analysis skills will chime in.

 

[f350flatbed]

As requested.
http://www.oilburners.net/forums/vbpicgallery.php?do=big&p=472
http://www.oilburners.net/forums/vbpicgallery.php?do=big&p=473
http://www.oilburners.net/forums/vbpicgallery.php?do=big&p=474
I had cleaned the piston already, it was covered with black soot and other particulate matter. I have checked and it doesn't look like I'm having a coolant issue. I began to put the SCA's to it as soon as I got it, but there's no telling what the people before did with it. Thanks for the help guys, I think I will have a much clearer picture of what happened when I finally get the bottom taken apart.

Paul B

 

[smoking89IDI]

Do you see any beach marks on the fractured end of the rod?

The following pics illustrate what beach marks are if you don't know . Beach marks are a type of fatigue crack that propagates fairly slowly and can happen over years (I.E. firewall crack near clutch) or as fast as seconds (I.E. spinning/rotating assembly at a decent speed). If any of it looks like it is ***** it is ductile and is still a pretty fast break but slower than brittle, a fatigue crack will start out with beach marks and will end in ductile or brittle depending on load, brittle is the fastest break and is usually very sparkly not dull like ductile. Just trying to give you an idea if this started a long time ago or just recently.

This site will give a good idea on beach marks (don't worry it is short).
http://www.resnapshot.com/MP1198.htm

Let us know what else you find and I hope this helps!

I just now realized that the failure analysis class I took at work actually sunk in!!!

Mouse over the pics for the name.