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SECTION 8
MAl
NTENANCE
Page
16
•
COOLING SYSTEM
The cooling system operates under pressurewhich is con-
trolled by a pressure-relief valve in the radiator cap.
CARE OF THE SYSTEM
Proper cooling is assuredonly when the system is sealed;the
radiator cap gasket is in good condition; the pressure-relief
valve and thermostats are operating properly; the system is
free of coolant and air-flow restrictions; and the system is
filled to the proper level.
To keep the system internally free of rust and sludge,usethe
proper coolants as specified in your Cummins Engine Opera-
tor's Manual.
Drain and thoroughly flush the system at least twice a year.
The appearanceof rust or sludge in the system indicates the
rust and sludge inhibitor additives are weakenedand must be
replaced. Refer to "CLEANING
THE SYSTEM" in this
section.
CHECKING COOLANT LEVEL
1. Check the coolant level at the sight gauge(1IIust. 21) in the
top tank of the radiator. The ball must be floating at the top
of the sight gauge.
2. If the ball is not at the top of the sight gauge,add coolant.
Refer to "FILLING THE SYSTEM."
lIIust.
21
Radiator Sight Gauge.
DRAINING THE SYSTEM
1.
Run the engineuntil the enginecoolant temperature gauge
is in the "RUN" area,then shut the enginedown.
2. Removethe radiator cap. UseCAUTION. Refer to "RADI-
ATOR CAP."
3. Open the radiator drain valve (Illust. 22) located just ahead
of the fuel tank on the far right side.
•
4. Removethe crankcasedrain plugs.
5. Allow the system to drain completely. Do not let the drain
outlets plug up during draining.
6. Reinstall the crankcase drain plugs and close the radiator
drain valve.
•
•
lIIust.
22
Radiator Drain Valve.
FILLING THE SYSTEM
Do not add coolant into the radiator of an overheatedengine
unlessabsolutely necessary.However, if necessary:
____
Remove the radiator cap (lllust. 23) carefully;
refer to "RADIATOR
CAP" in this section.
•
____
Coolant must be added to radiator slowly with
engine running at low idle speed.
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