What caused this damage to the piston and head?
20

Asked by jmeech 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.

9 Answers
70,965

Kelly answered 8 years ago

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

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20

jmeech answered 8 years ago

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

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Guru93ZWT7 answered about a year ago

it is a valve seat, probably got the engine too hot and as it expanded the seat dropped and got broken up. That is what happened to mine.

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