John Berryman wrote:
On Apr 6, 2006, at 11:49 AM, Christopher McCann wrote:
So there is NO moving part in an IP that is lubricated with JUST
fuel? engine oil lubricates everything? Cant't see how that could
be...I'm probably wrong, but would like a little more info/
confirmation.
The parts of the pump that come in contact with the fuel are
lubricated by the sulphur in the fuel. There is no mixing (or rather
shouldn't be any mixing) of motor oil with fuel. Most of the IP is
lubed by motor oil. Viewing a cut-away of an IP may help you
comprehend the above statement.
Correction: Sulfur lubricates NOTHING! When refining to remove sulfur
from the fuel, often other fractions that are lubricants are also
removed. Unless they are replaced (they often weren't when low sulfur
diesel was first produced) the fuel will have less lubricity. #1 diesel
has the same sulfur content as #2 but #1 has MUCH, MUCH poorer
lubricity. ULSD has almost NO sulfur but better lubricity than than ANY
#1 diesel and than MOST #2.
Marshall
--
Marshall Booth (who doesn't respond to unsigned questions)
"der Dieseling Doktor" [EMAIL PROTECTED]
'87 300TD 182Kmi, '85 190D 2.0 161Kmi, '87 190D 2.5 turbo 237kmi, '84
190D 2.2 229Kmi (retired)
