PS Magazine - TB 43-PS-727
PS, The Preventative Maintenance Monthly
ISSUE 727
JUNE 2013
3
PS 727
JUN 13
c
rewmen, if you think keeping your Stryker’s on board oil exchanger (OBOE) Flled
means you don’t have to check the engine oil—you better think again!
The OBOE works like this: ±or every 10 hours of operation, the OBOE takes
approximately 1 quart of oil from the engine and injects it into the fuel system where
it’s burned off.
Then the OBOE replaces that engine oil from its 1.71-gal reservoir. When it’s
full, the OBOE can continue to replace the burned-off engine oil for about 60 hours
before it runs dry.
When it’s empty, the OBOE will continue to draw oil from the engine for burnoff.
And if there’s not enough oil for the engine, the engine burns up!
To keep that from hap-
pening, check the three sight
glasses on the side of the
²at bottom Stryker’s OBOE.
There’s one at the top, one in
the middle and one near the
bottom. You’re good to go if
you can see oil in the top sight
glass. But if you can’t see oil
in the bottom sight glass, your
OBOE is WAY overdue for a
Fll-up.
On the double V-hull (DVH) Stryker, the OBOE is located toward the front of
the engine compartment and has a single sight glass. If the oil level is at the ±ULL
mark, you are good. But if the oil level falls below the ADD mark, service the OBOE
right away.
Some crewmen wrongly assume that just because they keep the OBOE Flled, they
don’t have to check the engine oil. The
only
way to know if you have an oil leak or
oil contamination is to check the engine oil.
Before checking your Stryker’s
engine oil, make sure the vehicle
is on level ground. And wait at
least 20 minutes after shutting
the engine down before pulling
the dipstick.
The oil level should be in the
crosshatched area of the dipstick.
Look
for
whitish
blobs
that
indicate water contamination. And
take a sniff—if you smell fuel, the
oil could be contaminated.
C
rewmen, it’s easy to put your feet
in the wrong place when you’re
pulling the air Flter on your Stryker
for cleaning. But one wrong step and
a big problem can follow.
The coolant reservoir can’t support
your weight. If you step on it, you
may not see any apparent damage.
But the inner seal can crack, sending
all the coolant to the over±ow tank
and causing an overheated engine.
oil for one
and
one for oil!
Stryker…
Watch Your Step Around the Reservoir
Don’t step
on coolant
reservoir!
Oil
should
be in
cross-
hatched
area
OBOE on ±at bottom Stryker has three sight glasses
While you’re
checking the
oil, be sure to
check the dipstick
tube
closely
for
cracks or leaks.
Oil overfill,
discolored oil
or a cracked
dipstick tube
deadlines
the
vehicle.
I thought
you checked
the OBoe?
but you
didn’t
check my engine
Oil level!!
I
did!
Stryker…
727 02-03.indd
1-2
4/30/13
5:25 PM
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