MBE4000 APPLICATION AND INSTALLATION
The highest single source heat load to the coolant generally occurs during the no fuel braking
mode in applications that use retarders. The amount of heat generated from a retarder is dependent
upon its frequency and duration of application. The heat load source is from the retarder oil
cooler, but engine friction heat also exists. The cooling system
must
be able to control maximum
engine coolant temperature regardless of the mode of operation.
Additional Heat Loads to Air
The following factors or components will raise the temperature of the radiator inlet air or increase
restriction to air
fl
ow when selecting a radiator and fan. The following are some of the common
factors:
□
Air-to-air coolers
□
Oil-to-air coolers
□
Hydraulic coolers
□
Transmission coolers
□
Recirculated radiator discharge air
□
Engine radiated heat (blower fans)
□
Air conditioning condenser
□
Engine compartment con
fi
guration
□
Fuel coolers
Coolant Type
The type of coolant chosen for a cooling system can have an effect on the system performance.
Water pump output and heat transfer characteristics are different for water than for antifreeze
because the
fl
uids have different densities, viscosities and thermal conductivity. The heat
exchanger manufacturer is the best source for determining what the difference in performance
would be from one type of coolant to the next.
Plumbing
Consider the following requirements for all water connections made between the engine and the
radiator, deaeration tank, heaters,
fi
lters, etc.:
□
All connections
must
be as direct as possible, durable, and require minimal maintenance.
□
Pipe and hose connections
must not
be necked down or be smaller than the engine
inlet(s) and outlet(s). Fitting size
must
be considered so minimum hose inside diameter
requirements are not exceeded.
□
The number of connections
must
be kept to a minimum to reduce potential leakage.
□
Use short and straight sections of hose only. Use formed tubes when bends are required.
Otherwise the use of formed tubes is not recommended.
All information subject to change without notice.
(Rev. 03/06)
7-21
7SA250 0603
Copyright © 2006 DETROIT DIESEL CORPORATION