PS Magazine - TB 43-PS-694
PS, The Preventative Maintenance Monthly
ISSUE 694
SEPTEMBER 2010
14
PS 694
SEP 10
15
PS 694
SEP 10
•
At normal oil change intervals, allow the oil to drain from the oil pan for at least
20 minutes.
i
f your unit has FMTVs with serial number 100,001 or higher, listen up! Trucks equipped
with C7 engines can experience oil blow-by problems due to over±lling.
Over±lling engines can blow the extra oil out of the engine breather tube. That’s
why Caterpillar and TACOM have decided to lower the engine oil levels in the C7 engine
crankcases from 24 to 22 quarts. This should solve the problem.
During normal PMCS oil change intervals, or whenever needed, units can re-mark
their current C7 dipsticks, NSN 6680-01-568-9447, PN 252-0507, to the new 22-qt range or
purchase a new 22-qt dipstick, NSN 6680-01-568-9447, PN 348-6030. FMTV LTAS (long term
armor strategy) trucks with serial number 705248 and above should already have this new
dipstick. They were installed at the factory.
FMTV TM
Changes
to Come
Helpful Hint
Never
add oil to an engine that has just been shut down. Wait at least 20 minutes to
allow the oil level to stabilize in the crankcase. Checking and adding oil when the engine
is ±rst shut off will likely result in over±lling the engine!
•
After removing and wiping the dipstick, insert and remove it and observe the new oil
“Full” level. If the oil level does not line up with the original dipstick “Full” range marks,
etch a new “Full” line on the backside of the dipstick.
–
Caution: Before re-marking your dipstick, ensure your original dipstick has part
number 252-0507 stamped on the lower end.
–
Note: Due to unknown quantities of residual oil draining back from engine
components and cavities, re-marking of the dipstick may not always be necessary.
•
If a new “Full” line was made, measure
1
/
2
inch down from that line and etch a new
“Add” line.
•
Using a suitable tool, make the old range markings on the front side of the dipstick
unreadable.
•
If the dipstick has been modi±ed, keep future oil capacity levels between the new
“Full & Add” marks made on the backside.
•
Fill the C7 engine with 22 quarts of oil.
•
Start and run the engine for at least 10 minutes and then
shut it off.
•
Wait at least 20 minutes before checking the oil level again.
•
Remove and
replace the engine
oil ±lter and use
Caterpillar oil ±lter,
NSN 2910-01-519-
3768, PN 1R1807.
Do not remove engine oil ±lter while engine is hot. Failure
to comply may result in severe injury to personnel.
FMTV…
oil over-
filling
fix
Make sure you have the right
dipstick before re-marking
here are
some of
the pmcs
changes
you’ll see
in the tms
later…
this
warning
applies
to
oil,
too!
hey, buddy,
{ahem} did you
know you were
leaking oil?
it’s not
my
fault…
someone put
too much
oil in me!
694.14-15.indd
1-2
8/4/10
11:28:29 AM
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