Mechanics

CAN BAD SET TIMING CAUSE VALVES TO BREAK AND DESTROY HEAD AND PISTONS?

2002 Ford F-150 • 15,000 miles

Put in rebuilt heads on a 2002 ford f150 4.6 v8. I think the timing chain was put on wrong but not sure. Upon starting car ther was 2 loud knocks. The engine did not turn. Open the heads again and three of the four valves had completely broken with enough force to send 1 valve through a piston an d made a hole. Pistons were damaged and head beyond repair. What could have happened? Any advice would help. THank you
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Adriangallardo
August 16, 2012.



Absolutely. It is an interference engine.

When were the heads installed?

Roy

ASEMaster6371
Aug 16, 2012.