[mdrohan]

I took my 2004 F350 in for service, and long story short, I had to replace two warped cylinder heads. I ordered "new" remaned heads from a company that will for now remain nameless, and after the Ford dealership installed them, two push rods were bent and the rocker arm cracked.

My problem is now it is another 2k+ for the teardown, and everyone is pointing fingers. The Dealer showed me on the dissasembled truck where the valves actually struck the top of the piston. Their claim is that when remilled, the machine shop did not properly raise the valves when they resurfaced the heads, thereby causing the damage. In turn, the machine shop said the rocker arm was overtighted and caused the damage. To me this does not sound possible? could an overtighted rocker arm force two valves into a piston?

 

[dannyboy950]

If the push rods were not actually seated in the lifter pockket and were instead against the block when tightened it would keep the respective valves partially open all the time.

When the cylinder came up to TDC the piston would indeed hit the valves, useually bending the valves, pushrods and damageing the piston to some degee.

I am afaid it is still assembler error. The few thousandsth that they can shave the head shouldn't allow the valve to protrude enough to hit the piston.