What caused this damage to the piston and head?

Asked by Oct 05, 2016 at 06:20 PM about the 2007 Jeep Grand Cherokee Overland 4WD

Question type: General

I am trying to figure out what caused the damage to this piston and head. I
also found little pieces of metal in the intake plenum. not sure what they are
either? Valves, rockers, springs, rods all look okay.

8 Answers

26,525

is the plug gap/s closed??? how long has it sat without starting? did you ever here knocking///pre. ign !

26,525

also what does the top of the pistion look like... ?

the plug gap is not closed. It was driven every day. The only knocking was when it died.

piston matches the head damage.

pic

head

chunks found in intake plenum

dropped a valve guide

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