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
I wonder if the "first fill" may be a major contributor to the failures.
Common statement
Lubricity: It is essential that the lubricity of the fuel as measured by the HFRR test specified in ISO
12156-1 meets the requirement of a wear scar diameter not greater than 460 microns. In addition, it is
recommended by the Diesel FIE manufacturers, that “first fill” of the fuel tank should be with fuel with
good lubricity characteristics (HFRR < 400 µm) in order to guarantee good “run-in” of the injection system
components. The US diesel specification (ASTM D 975-09) includes a lubricity value of 520 µm maximum
(according to ASTM D 6079). It is expected that the useful operating lifetime of any mechanical
component will be adversely affected by fuel with a lubricity exceeding 460 microns.
Common statement
Lubricity: It is essential that the lubricity of the fuel as measured by the HFRR test specified in ISO
12156-1 meets the requirement of a wear scar diameter not greater than 460 microns. In addition, it is
recommended by the Diesel FIE manufacturers, that “first fill” of the fuel tank should be with fuel with
good lubricity characteristics (HFRR < 400 µm) in order to guarantee good “run-in” of the injection system
components. The US diesel specification (ASTM D 975-09) includes a lubricity value of 520 µm maximum
(according to ASTM D 6079). It is expected that the useful operating lifetime of any mechanical
component will be adversely affected by fuel with a lubricity exceeding 460 microns.
