Ford's answers to the NHTSA 6.7 Investigation

TriumphGuy wrote:
snip...

I won't pretend to know all that I should to delve into this but...

Do you think going to DLC on one side just was another in a long line of cost reduction moves?

Don't know the sequence, but IIRC, the the DLC was added to both surfaces

Then they removed it from one surface

Would you expect if both were not coated at all there would be improved film strength (such that we'd see longer pump life)? Or would it really matter that much since we're talking about ULSD?

Diesel is a fuel that has some lubrication properties. The only other
application that I know of that uses fuel as a lube is in a 2 cycle ICE

Strange for me to look at that cam and follower, knowing that diesel fuel is flowing in there while I'm accustomed to seeing something more viscous (i.e. engine oil) in that sort of mechanism. But I confess I don't look at pump innards every day.

I'm left wondering if there are other similar applications of cam/followers that have been successful without (what I'd think of as) adequate lubrication...

Am sure there are, but to keep it in context, the PSI on the mating
surfaces must the the same. Ditto surface foot per minute, etc

Anyone know of other Bosch applications of DLC?

• OEMs have replaced the whole injector system, why?
• What is in the debris..DLC?
• Why did they remove DLC from one surface...is that the surface that degraded in 'most' of the failures
• H2O...catalyst to cavitation?
• Piston not captured to follower...hammering of the piston bottom to follower common
• ???