Dieseldude isn't saying that xxxx* is the limit.. he's just saying that a piston will melt before the turbo does... But since he didn't have an EGT gauge, we have NO idea what kidna temps he was running, but I'll bet it was REAL hot!

 

Thank you for understanding my message. I thought I was speaking an unknown language there for a few minutes.

 

I believe your response is accurate to the original question...which melts first. The topic strayed a little and was discussing "what" temps might melt a piston. It is too bad you did not have a EGT gauge to see what you temp was before melt down. Looking at you speed, load, and grade, I bet you were hotter than hades.

 

I looked at the temp gauge and it was reading about 230 or so and by the time I backed out of it, the damage was done and it started knocking (I think the t-stat stuck maybe). I drove it about 300 plus miles after that cause I couldn't get anyone to come get me and I wasn't going to pay a tow bill with a 30 foor GN attached. I figured it would either get me home or fall out on the pavement smoking. It got me all the way home and even made two 50 mile intermediate trips after that until I trailered it out to Indiana. Figured it was already ruined so I used it anyway.
Didn't hurt the block at all but the piston was trashed. Bearings were fine too.

This is mine on the GN pulled by my sons 94 to Indiana.

https://www.dieseltruckresource.com/...cat/500/page/1


This is on the dyno last Friday night at my Claremont Roundup.

https://www.dieseltruckresource.com/...cat/500/page/1

 

Here are the questions again ...

BTW, DD4x4, what did she pull on the dyno?

 

390 and 901. Actually a little more than I wanted.

Here is the link to the piston pics.

https://www.dieseltruckresource.com/...cat/500/page/1

 

Good power. But is there such a thing as too much hp/tq?

Nice job cooking the piston. Do they let you volunteer at the bbq grills....

 

Not too sure about whick melts first,...........
But I'm pretty sure your credit card will melt second.......

Right DD4X4?.......

 

Dieseldude,

Sorry about your experience. I feel your pain. My daughter borrowed the wife's Volvo 850 Turbo to drive 200 mi to her college for a weekend event over the summer. About halfway there, she notices the car is jerking and a funny smell. She finally pulls over and calls me up from her cellphone. She asks me what to do. She says steam is coming off the engine and coolant is pouring out the bottom. After blurting out a few expletives, I started arranging to rent a flatbed trailer to bring it home. When I described the symptoms, the mechanic was pretty sure it was a blown head gasket. Later, when I got a call from the mechanic after he tore it down, he told me he couldn't believe what he saw. She drove it so long while hot that she actually melted the engine BLOCK. He had never seen anything like it. I couldn't even do a shortblock exchange because the core was so bad. So, I bought a used engine (still over $5k installed). Post-mortem said a $24 T-stat was to blame - that and an inattentive 19yr old.

Thanks for confirming what I thought. Piston goes before turbo. That was the general consensus in the PSD world. I just thought maybe the CTD was a different animal based on posts I read here about melting turbos (understanding the difference between "coking" the turbo by hot shutdowns vs. melting them with excessive EGTs).

Neil

 

Should be able to grind sand and fill that thing back to good as new now.



Did you check the oil nozzles? Might be a dumb question.

 

Yes, they did check the oil nozzles and they were fine. That was my first question also.

 

To me it seems a bit strange it would burn up like that unless it took some serious heat more often then that one run.

So the final consensus was high heat on the one cylinder from that single run? That does tell me that we have a big variance of temps from cyl to cyl then.

Which cylinder was it?

Scotty

 

The title of the photo is "top of NUMBER SIX piston" you dummy.

 

I know that ya lil dummy...its a known fact that 6 is hotter then any other.

 

Scotty, apparently Big Blue has never met you eh?

(clue for Big Blue, Scotty's right arm weighs more than you do)