Ford's answers to the NHTSA 6.7 Investigation
There was a request for a link to Ford's answer's to the NHTSA investigation posted on a previous thread, since closed. Here is the link: Ford's NHTSA Answers to the 6.7 investigation This PDF i...
Forum Discussion
NewsW wrote:
Observations on suggested fix of replacing the pump before it fails:
Not recommended.
Reason: as of right now, we cannot find rhyme or reason for the failure.
The only sure thing supported by the data is that it fails in summer, usually after a previous "hot" run.
There is no rhyme or reason as far as mileage goes.
We can't say it last 30,000 miles, so replace it at 28,000.
Yes, then this leads back to H2O and/or cavitation in that poorly
lubed cam cavity and the hammering of the follower and piston
Or just the presence of H2O and/or emulsification of H2O and whatever
that is the final straw to loosen debris
Or the lost lube properties in this very poorly lubed cavity due to
any form of H2O intrusion?
A new thought is that if they had captured/fastened the piston to the
follower, this would not hammer even if the metering valve shuts to
create cavitation in the cylinder head. Then the poor lubed cam cavity
would just be poorly lubed and maybe last longer or long enough...
