Chassis Information --- Section 10
The Executive 2005
489
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 fins. 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 mini-
mum water pressure, standing back a distance to avoid bending the fins.
BRAKE - AUXILIARY (ENGINE BRAKE)
Auxiliary braking systems are designed to supplement the standard air braking system. These devices
are not designed to bring the motorhome to a complete stop; however, can assist in controlling the speed
of the motorhome. Use of the engine braking system can extend the life of pads, shoes, rotors and
drums, saving on costly service brake repairs.
The "Jake" brake is an engine-braking device that operates on a different principle than an
exhaust brake. An engine brake functions by releasing engine compression. The effect of the engine
brake increases with engine speed. When the engine brake is activated the Allison transmission
automatically downshifts, utilizing the gear selected and maximizing the engine braking effect.
When the engine brake activates, an electrical signal is sent to the engine ECM (electronic control
module). The ECM controls a hydraulic circuit that opens the exhaust valves near the end of the
compression stroke. The potential engine braking power depends on turbocharger boost pressure,
engine speed, compression ratio, injector timing and when the exhaust valves open.
Located on the left console is a HI/LOW switch. The HI/LOW switch allows for the selection of
different levels of engine braking power. Selecting LOW activates the engine brake on three cylin-
ders. Selecting the HI setting activates the engine brake on six cylinders.
090388b
090388e
ISX & Series 60 Assembly
ISM Assembly
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