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6.5 Diesel Issue. Any ideas what happened?

J

Jeff NWOH

Member
Bought this project under the assumption that it blew a head gasket or cracked a head. Obviously a little more serious than that. I'm just kind of curious how a piston just self destruct like this. I had a duramax project a few years ago that melted a piston from a bad injector, but this looks nothing like it.

It shows a little over 300k on the odometer, although the title is marked with an odo discrepancy. If I had to guess, I'd say there is probably less on the truck.
a149846.jpg

a149847.jpg

a149848.jpg
 
I have a piston out of an old Cummin's diesel that looks a lot like that one and it was caused by a crack sleeve letting antifreeze into that cylinder which is said to have been caused by to much starter fluid causing the sleeve to crack
 
Maybe engine was pushed too hard and the EGT got too high. When I put a chip on my Duramax instruction say the chip will automatically defuel the engine when the EGT (exhaust Gas Temperature) hits 1500 and it does. Factory just lets it go.
Did you loose the whole thing or just that piston and rod?
 
I have seen piston skirts break twice like that. Both times the sleeves cracked first and the cylinder started ingesting coolant. I never determined why the sleeves cracked, but I can't rule out ether.
 
had that happen on a cab over Chevy truck one time. gas engine started knocking a little. 292 6 engine. pulled the head couldn't see anything wrong, pulled the pan used a yard stick to push the piston out of the block. No either on it, no over reving, just broke in the bottom ring grove. don't know what happened
 
The 6.5's are notorious for cracks in the main bearing webs but cracked cylinder bores occur occasionally.
that piston puked cause of coolant leaking in.
 
Just a guess. Check out the gasket sealing area on the block at about 7:00 on that cylinder. Looks like a coolant leak. Eventually enough gets in that it hydraulics and starts breaking parts and splits the cylinder wall. The piston top is really clean. That's an indication of a coolant leak. At any rate the block is done and maybe the crank too.

Greg
 
could be starting fluid, as thats my bet with looking at the broken piston. could be reved out cold. the first piston has marks on it also. they cant be driven like a gas engine. this this was totally abused.
 
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