MBE4000 APPLICATION AND INSTALLATION
7.7
COOLING SYSTEM PERFORMANCE REQUIREMENTS
Engine heat transferred to the coolant
must
be dissipated at a suf
fi
cient rate so engine coolant
temperature does not exceed established safe limits under all operating conditions. The typical
maximum engine coolant temperature is 221°F (105°C) for on-highway engines as listed in
Table 7-1. Speci
fi
c requirements are is listed in the “Technical Data” section of this manual
(refer to section 14).
Engine
Maximum Engine Coolant Temperature
On-highway
105°C (221°F)
Table 7-1
Maximum Engine Coolant Out Temperature
The maximum ambient temperature at which these requirements are met is referred to as ambient
capability. Operating with antifreeze, at high elevation, or other severe environmental conditions
will require increasing the cooling capability of the system so the maximum allowable engine
coolant temperature is not exceeded.
7.7.1
SYSTEM FILL
The cooling system
must
have suf
fi
cient venting (air bleeding) to permit
fi
lling at a minimum
continuous rate of 8 L/min (2 gal/min) and on an interrupted basis using a 10 liter (2-3 gallon)
bucket. Upon
fi
rst indication of a full system, the amount of coolant needed to complete the
fi
ll
must not
exceed the satisfactory drawdown amount. This is also a requirement for interrupted
fi
ll. Refer to section 7.7.5 for drawdown capacity information.
7.7.2
SYSTEM DRAIN
Suf
fi
cient drains, strategically located,
must
be provided so the cooling system can be drained to:
□
Prevent freeze problems during cold weather storage
□
Remove all contaminated coolant during system cleaning
□
Minimize re
fi
ll problems due to trapped air or water pockets
7.7.3
DEAERATION
The cooling system
must
be capable of expelling all entrapped air within 10 minutes varying
engine speed between idle and rated speed after an initial
fi
ll with blocked open thermostats.
The water pump
must not
become air bound.
NOTICE:
An air bound pump cannot adequately circulate coolant. This can
lead to overheating and severe engine damage.
All information subject to change without notice.
(Rev. 03/06)
7-13
7SA250 0603
Copyright © 2006 DETROIT DIESEL CORPORATION