I thought these things were bullet proof??

[sondogg12]

got one in for oil leaks and runs rough.had codes for cylinder 2 cont. and missfire #2. had koeo for glowplug #2.powerbalance #2 droping.relative compression down some on cylinder 2 and 7,which #7 prob caused by readings of #2 since its next in the firing order.sft cylinder 2 at 25.pulled out glowplug and found tip melted.I just figured injector overfueled and washed cylinders down some.I was hoping after installing new injector theyll pick back up.It didn't.Did manual compression test,cylinder 2 150psi. inspected valve train,nothing broken.Removed cab for first time.Not that bad,made it pretty simple.removed turbocharger and removed bank 2 cylinder head.Found piston melted.Melted a hole in the piston.There sending me a complete,since threre are no short or long blocks available yet.

[sondogg12]

oh yea. the oil leak was coming from the front seal.Seal stickin out a 1/4 in.out of housing.probley pushed out by all that crankcase pressure... /forums/images/%%GRAEMLIN_URL%%/thumbup.gif

[Keith Browning]

Wow, a 6.4 with melted pistons. No idea what caused it? In the 6.0L over boosting was the primary suspect but a HotLine engineer once told me it was caused by "fueling issues." I don't see how something in the fuel system could cause a bunch of #3 & #5 pistons to melt. On a 6.0 those are the cylinders I usually find melted. Fortunately I haven't seen much iron lately... knock on wood.

[sondogg12]

maybe overfueling.?

[Diesel Jay]

When it comes to HPCR, if an injector tip breaks off or sticks open, the cylinder will overfuel and it becomes pretty easy to melt a piston and/or cause other kinds of damage. The trick is in crafting the diagnostics to quickly detect the condition and prevent damage, but it's far easier said than done.

 

Beyond that, you have to rely on the QC of the injector mfg'er (Siemens) to prevent the injectors from failing.

 

- Jay