Engine Cooling System - Hobart 60CU20 Operation And Maintenance Manual With Illustrated Parts List

OM-2226 / Operation and Maintenance Manual
60CU20 / Series 500062 / 400 Hz. Generator Set

6) Engine Cooling System

a) General
Cooling system service requires more than maintaining the proper coolant level in the radiator and
protecting the system against freezing. Water should by clean and free of any corrosive chemicals
such as chloride, sulfate, and acids. It should be kept slightly alkaline with a pH value in the range of
8.0 to 9.5. Any water, which is suitable for drinking, can be used in the engine when properly treated
as described in engine manufacturer's operation manual. The engine manufacturer's representative
should be consulted regarding the selection of satisfactory brand, permanent-type antifreeze for use
in the cooling system.
b) Radiator Cap
(1) General
A pressure relief valve is built into the radiator cap. It is designed to open at a pressure of
approximately 15 psi (103.4 Kpa).
WARNING
When removing cap from a very hot radiator, do not turn cap past safety stop until the
pressure or steam has escaped.
(2) Removal
To remove, turn the cap to the left (counterclockwise) to the safety stop. When all pressure is
released, press down on the cap and continue to turn until the cap is free to be removed.
CAUTION
Allow engine to cool before adding coolant.
CAUTION
Do not attempt to repair the valve in a radiator cap in case of failure. Replace with a
new cap.
(3) Installation
When installing the cap, be sure it is turned clockwise as far as it will go so that the pressure
retaining valve will be functional.
c) Coolant
The preparation and maintenance of the coolant solution is important to engine life and is completely
covered in the engine manufacturer's operation manual. For information regarding coolant
specifications, testing equipment, antifreeze, etc., refer to engine manufacturer's operation manual
that accompanies the equipment manufacturer's manual or consult the local engine manufacturer's
representative.
May 2, 2013 Chapter 2-2
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