Paccar MX-11, Operator'S Manual

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The use of approved biodiesel fuel does
not affect the PACCAR engine warranty.
Failures caused by the use of non-
approved biodiesel fuels or other fuel
additives that are of unacceptable quality
or do not meet specified industry standards
are not considered as defects of parts or
workmanship by PACCAR and therefore
will not be covered by the PACCAR engine
warranty.
PACCAR recommends that customers
intending to use biodiesel blends become
familiar with the additional handling
considerations of these fuels such as
aging, metal compatibility and tendency to
absorb water. Please reference the fuel
supplier’s technical information or industry
guidelines such as the American Trucking
Association Truck Maintenance Council
document RP 357.
In particular, operators should be aware
that biodiesel blends are more prone to
cold flow (gelling) and filter plugging issues
compared to conventional diesel fuel. If
vehicles are expected to be operated in
temperatures below freezing, care should
be taken to ensure that both the biodiesel
fuel used and the appropriate vehicle fuel
system accessory heaters are utilized.
Operators should also be aware that
biodiesel energy content (by volume) is lower than diesel which can reduce fuel
economy by up to two percent.
Recommendations to
Avoid Fuel Gelling
To avoid fuel gelling in cold weather:
• Use appropriate fuel grade/blend
for conditions
• Spec your vehicle with proper cold
weather equipment (12V electric
pre-heater, fuel/coolant heater, 12V
fuel line heaters and fuel tank
heaters)
PACCAR does not recommend the use of
fuel additives, however, should a customer
decide there is a need for temporary use of
a winter fuel additive, PACCAR offers the
following guidance:
• Use an industry known, high quality
product (EPA-approved)
• Check the product label to ensure it
is compatible with ultra-low sulfur
diesel fuel and aftertreatment
systems
• Only use the additive for the
minimum time needed
• Follow the additive manufacturer's
instructions exactly
Maintenance Procedures
Engine Oil Level
To check engine oil level, park vehicle on
level ground and wait 15 minutes after
shutting off engine. After the engine is shut
off it will take at least 15 minutes for all the
engine oil to return to the sump.
NOTE
It takes approximately 15 minutes for
all the oil to run into the sump when
the engine is ‘warm.’ If the level is
checked immediately after switching
off the engine, the dipstick will show a
low oil level.
Make sure that the vehicle suspension is
sitting flat, both lengthwise and crosswise.
Check this carefully on a vehicle with air
suspension.
Engine coolant should be at or above the
operating temperature of 180°F (82°C).
This procedure should be followed as part
of routine maintenance checks.
ENGINE MAINTENANCE - Recommendations to Avoid Fuel Gelling
66 Y53-1166-1M1 (10/2020)
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