Cracked Piston thread

[Cknox121]

Wow that piston looks like ****. Weird marks on it

Might be because of that oil I run? The injectors checked out okay.


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[Stroked777]

nah that cylinder looks like it was run really hot, looked like coked up soot on there, like ash

 

[Cknox121]

nah that cylinder looks like it was run really hot, looked like coked up soot on there, like ash

That whole side of the motor was run hot then. FWIW I was running H&S hd300 before I yoked the cab.


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[Stroked777]

It was just one side? That definitely looks like ash from soot. That had to get really hot probably causing the piston to crack. I wonder what mine look like. I maxed out my egt reading during a pull one evening LOL I don't have excessive blow by though

 

[Cknox121]

It was just one side? That definitely looks like ash from soot. That had to get really hot probably causing the piston to crack. I wonder what mine look like. I maxed out my egt reading during a pull one evening LOL I don't have excessive blow by though

Yes. Other side had gotten hot to. But when I popped the head off the cylinders filled with coolant and washed some of the ash off.

I didn't have excessive blow by either. Truck was running great other then a blowed bellow. Wasn't until after I popped the head off that I noticed the crack. It won't be long my friend.


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[Autoguns]

Here is mine from cyl 7,I haven't seen one cracking down low like this yet. It must have just started. Lower right side of piston.

I know this is an old thread but this looks a lot line #7 in mine... Haven't took it apart yet but the bore scope should a lot of the same look . Only worse