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2012 Trip
Coolant System - Thawing:
If the coolant system becomes frozen,
the motorhome must be towed. Place the
motorhome in a warm area until completely
thawed. If the engine is operated when the
cooling system is frozen, the engine may
overheat due to insufficient coolant circulation.
Once thawed, check the engine, radiator and
related components for damage caused by
expansion of frozen coolant.
Coolant Hoses:
Inspect coolant hoses and connections when
checking engine or transmission fluids. Look
for any signs of chaffing at hose restraints
or sharp edges. Indications that hoses have
reached the end of service life include cracking
or swelling around clamps and connections.
Oil leaks can also deteriorate hoses.
Overheating can be caused by a collapsed
hose. Old hoses can also deteriorate on the
inside causing partial clogs and reducing
cooling efficiency. Replace any hose found to
be cracked, swollen or damaged. Periodically
check hose clamp torque.
Inspect:
Every 12 months - Inspect all hoses, clamps,
and fittings for leaks due to cracking, softness
and loose clamps/fittings. Look for signs of
fluid leaks, damaged end fittings or ballooning;
chafed, kinked, or crushed hoses, loose clamps
and fittings. Correct any deficiencies found.
Radiator/Charge Air Cooler
The diesel engine uses compression to ignite
the fuel/air charge. To increase compression
inside the combustion chamber (resulting
in increased power output) a turbocharger
is added to the engine. The turbocharger is
a paired housing assembly with impellers
inside each housing connected by a common
shaft. One impeller is propelled by the engine
exhaust which drives the other impeller. The
function of the other impeller is to increase
compression inside the combustion chamber
by forcing air into the intake manifold.
This process works well, however, the
intake air charge is heated two different
ways: through convection by the exhaust
gases driving the turbocharger and when air
is compressed. This negative effect inside the
combustion chamber results in lost power
potential. Therefore, a Charge Air Cooler
(CAC) is installed to cool the intake air before
it enters the engine. The CAC performs the
same function as a radiator, cooling air instead
of liquid. Ambient air passing through the
CAC will cool the engine intake air charge.
After leaving the turbocharger, intake air
is compressed and heated to approximately
300º to 375º F., depending on the engine load
and throttle position. Before air enters the
intake manifold, the CAC cools the intake
air temperature to the engine manufacturer
specifications. Lowered intake air temperatures
reduce exhaust emissions, improve fuel
economy and increase horsepower.
Cleaning and Maintenance:
Regular maintenance includes draining
the engine coolant, flushing/cleaning
the cooling system, inspecting the
water pump standpipe, replacing
the thermostat, gasket and seal, and
replacing the coolant and SCA element.
Inspect the charge air cooler every six
months and remove dirt and debris that
may block the fins. If the motorhome
develops an oil leak, there is a possibility
that the oil will coat the fins of the CAC.
Dust will adhere to the oil film, clog the
fins and reduce cooling efficiency. When
the oil leak is repaired, the CAC must be
thoroughly cleaned.
NOTE:
Refer to the OEM engine manual for
cooling system maintenance schedules.
090388c
Representation of radiator and
charge air cooler
Содержание Trip 2012
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Страница 139: ...134 Wat er Sy stems 6 2012 Trip Notes...
Страница 151: ...146 Pro p ane Sy tems 7 2012 Trip Notes...
Страница 173: ...168 Ho us e Electr ical 8 2012 Trip Notes...
Страница 190: ...185 Chassis Electrical 9 2012 Trip Engine No Start Flow Chart...
Страница 191: ...186 Ch as s is Electr ical 9 2012 Trip Notes...
Страница 237: ...232 Ch assis 10 2012 Trip Notes...