3406e keeps frying one cylinder

What's the piston look like? Are the rings still semi free in grooves? Cracks around piston top?

 

That is a good question but what does 4 corner scoring indicate?

 

Four corner scoring is usually lack of oil or a tight spot causing heat, swelling etc.

You say it's a 5ek block, but you are using 600 HP kits out if a C15. How bout a piston pack part number?

 

Compression can be a killer with the compound turbos and no IVA valves. I have seen a tight wrist pin cause four corner scoring as well as too much end play or thrust in the crank. Let's it shift enough that it puts the rod in a bind

 

Check the cam lobes for that cylinder.

 

Off topic but while some Cat folks are here. Just bought an injector for a C15 2005 and it cam with a disc. My machine will only read codes on this. Am I SOL?

 

Does the new injector have a trim code on it? I'm assuming you can read codes and change basic parameters

 

Thanks: I can see that now but will have to study up on IVA valves.