Section 05: COOLING SYSTEM
PA1553
6
4. COOLANT
4.1 COOLANT LEVEL VERIFICATION
Coolant level is correct when cold coolant is
visible through the surge tank sight glass
(Fig. 4). If coolant level is low, fill cooling system.
FIGURE 4: SURGE TANK SIGHT GLASS 05094
4.2 COOLANT LEVEL SENSOR
This warning device consists of a fluid level
probe mounted on the surge tank. The probe
sends a signal to the ECM to indicate coolant
level. If the coolant level drops below the probe,
the "Check Engine" light flashes and a
diagnostic code is registered (see section 01"
ENGINE").
CAUTION
Do not run engine with the “Check Engine”
light flashing.
The level probe is mounted on the R.H. side of
the surge tank while the electronic module is
mounted inside the rear electric junction box.
4.3 THAWING COOLING SYSTEM
If the cooling system becomes frozen solid,
place the coach in a warm area until the ice is
completely thawed. Under no circumstances
should the engine be operated when the cooling
system is frozen, as it will result in engine
overheating due to insufficient coolant.
Once thawed, check engine, radiator and
related components for damage caused by
expansion of frozen coolant fluid.
4.4 COOLANT REQUIREMENTS
The coolant provides a medium for heat transfer
and controls the internal temperature of the
engine during operation. In an engine having
proper coolant flow, some of the combustion
heat is conveyed through the cylinder walls and
the cylinder head into the coolant. Without
adequate coolant, normal heat transfer cannot
take place within the engine, and engine
temperature rapidly rises. Coolant must
therefore be carefully selected and properly
maintained.
Select and maintain coolant in order to meet the
following basic requirements:
o Provide for adequate heat transfer.
o Provide protection from cavitation damage.
o Provide a corrosion and erosion resistant
environment within the cooling system.
o Prevent formation of scale or sludge
deposits in the cooling system.
o Be compatible with the cooling system hose
and seal materials.
o Provide adequate freeze protection during
cold weather operation.
Combining suitable water with reliable inhibitors
satisfies the first five requirements. When freeze
protection is required, a solution of suitable
water and antifreeze containing adequate
inhibitors will provide a satisfactory coolant fluid.
Ethylene glycol-based antifreeze is
recommended for use in Series 60 engines. The
cooling system capacity is 24 US gal (91 liters).
NOTE
In general, antifreeze does not contain
adequate inhibitors. For this reason,
supplemental coolant additives are required.
For a complete overview of engine coolants
used with Detroit Diesel Engines, refer to
"Coolant Selections" For Engine Cooling
Systems Guide at the end of this section
(#7se298).
4.5 COOLING SYSTEM RECOMMENDATIONS
Always maintain cooling system at the proper
coolant level. Check daily.
The cooling system must be pressurized to
prevent localized boiling of coolant. The system
must be kept clean and leak-free. The filler and
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