CHASSIS INFORMATION - 10
198
CAYMAN 2007
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
specifi cations. Lowered intake air temperatures
reduce exhaust emissions, improve fuel
economy and increase horsepower. The CAC
will continually expand and contract up to ¼" as
throttle increases and decreases.
Cleaning and Maintenance:
Regular maintenance includes draining
the engine coolant, fl ushing/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 fi ns. If the motorhome
develops an oil leak, there is a possibility
that the oil will coat the fi ns of the CAC.
Dust will adhere to the oil fi lm, clog the
fi ns and reduce cooling effi ciency. When
the oil leak is repaired, the CAC must be
thoroughly cleaned.
During each oil change
inspect
the
engine side of the radiator/CAC
assembly for foreign objects that may
cause restriction.
Spraying degreaser on the charge air
cooler, as well as using a steam cleaner,
will not damage the CAC.
However
,
pressure washer and steam cleaner
nozzles placed too close to the CAC
can bend the fi ns
. The recommended
cleaning procedure for the CAC and the
radiator is to use a bucket of mild soap
and water. Carefully wash with a bristle
brush then rinse using a garden hose,
with minimum water pressure, standing
back a distance to avoid bending the fi ns.
When performing maintenance, it is also
necessary to
inspect
other components
of the cooling system. The charge
air cooler and radiator also requires
an
inspection
for cracks, broken
welds, secure mounting, and general
cleanliness.
Coolant Hoses:
Rotten, swollen and worn hoses, as well
as loose connections, are frequent causes of
coolant system problems. Overheating can be
caused by a collapsed hose or a clog caused by
rubber shedding from a rotten hose. Replace any
hose found to be cracked, swollen or damaged.
Connections should be
inspected
periodically
and hose clamps tightened.
Every 12 months:
Inspect
all hoses, clamps, and fi ttings for
leaks due to cracking, softness, and loose
clamps/fi ttings. Look for signs of fl uid leaks,
damaged end fi ttings, ballooning, chafed,
kinked, or crushed hoses, and loose clamps and
fi ttings. Correct any defi ciencies found.
TRANSMISSION
The Allison World transmission incorporates
the
World Transmission Electronic Control
(WTEC)
system. The system consists of fi ve
major components connected by a wiring
harness: the Electronic Control Unit (ECU),
engine throttle position sensor, three-speed
sensors, remote shift selector (keypad) and
the control module. The ECU processes
information received from the throttle position
sensor, speed sensor, pressure switch and shift
selector to provide optimum shift quality. This
is accomplished by matching transmission and
engine RPM during a shift to establish a desired
shift profi le within the ECU. Another feature
of the transmission is the ability to “learn” or
“adapt.” The electronic control system optimizes
shift quality by using “Adaptive Shifting.”
A wide variety of varied shift conditions
is required before optimizing shift quality.
Generally, fi ve typical shifts of a consistent shift
type are needed to optimize shift quality.
Summary of Contents for CAYMAN 2007
Page 12: ...GENERAL INFORMATION 1 CAYMAN 2007 8 NOTES...
Page 14: ......
Page 16: ......
Page 52: ...DRIVING SAFETY 2 CAYMAN 2007 48 NOTES...
Page 80: ...EXTERIOR INTERIOR CARE 3 CAYMAN 2007 76 NOTES...
Page 100: ...APPLIANCES 4 CAYMAN 2007 96 NOTES...
Page 132: ...WATER SYSTEMS 6 CAYMAN 2007 128 NOTES...
Page 160: ...ELECTRICAL SYSTEMS HOUSE 8 156 CAYMAN 2007 NOTES...
Page 226: ...INDEX 222 CAYMAN 2007 NOTES...