Ford's answers to the NHTSA 6.7 Investigation

NewsW wrote:
Hypothesis #1

Pump failure originates at the point of maximum friction between the cam, roller, and piston.

Failure is at the coating first, then become catastrophic.

snip...

Add that the point of contact is a high impact place and bet at the
same spot of the cam 'always'

Impact because the piston/cylinder goes max PSI at the end of the
compression stroke

Then as the piston retracts for the intake stroke...a large vacuum
is created...to then have a cavitation event occur.

When that bubble collapses the piston is somewhere in the cycle of
compression or still in-taking.

Does that lift the follower off the cam?

As the follower is held on the cam via a spring of some sort (no info
to date on that, yet)

Since the cam follower alignment to the cam is patented, asked if it
is some sort of caster...so does it realign correctly after that
cavitation event?

That reminds me, still no answer if the rest of the pump innards are
plated or not. Looking for H2O and oxidation in that witches brew
To then release debris, ever so small, into the shaft/cam/follower
arena to plow/gouge the DLC..which will then release more debris and
become too high a friction spot(s) to cascade further to blow up...