C4, TM 9-2350-230-12
TABLE 5-4. DRAINING COOLANT AND FUEL SYSTEMS
STEP
PROCEDURE
FIG/ITEM
DRAINING COOLANT SYSTEM (NORMAL TEMPERATURES TO -400F)
1
Traverse turret sideways and open engine left exhaust grille.
2
Remove surge tank filler cap.
CAUTION: If vehicle was previously operated, open surge tank filter
cap slowly to allow steam to escape.
3
Remove coolant drain plug hull access plug.
4
Remove coolant drain plug.
NOTE.
1. In temperate areas where the local ambient temperature is between
+80 and +32', use 50% water and 50% antifreeze. Refer to
the recommended antifreeze is not available, use rust inhibitor
FSN 6850-753-4967 with clean soft water.
2. When operating vehicle with expected temperatures between +32F to
-40F, coolant system mixture is 50%water and 50%; antifreeze.
Start engine immediately after refilling to mix water and antifreeze.
Refer to paragraph 1-6c for proper antifreeze to be used.
3. When operating in temperatures of +80F or over, fill with
6 gallons of clear water. Dissolve 22-1/2 ounces of inhibitor
(6850-753-4967) in 1 gallon of warm water and add to system while
engine is idling. Add sufficient water to fill system to operating
level. Record contents of coolant system on DD Form 1397 tag.
DRAINING COOLANT SYSTEM (-40F. TO -650F TEMPERATURE)
1
Open engine left and right exhaust grilles.
2
Follow steps 2 through 4 above.
NOTE. Allow system to drain, then proceed to following steps.
3
Remove engine oil filter hull access plug and open drain cock on bottom
5-7/9, 10
of oil cooler.
4
Reach down over engine and open engine block left and right drain cocks.
5
Open thermostat housing drain cock.
NOTE. When operating vehicle with expected temperatures between
-40F. to -65F., use full strength antifreeze; refer to paragraph
i-6c.
DRAINING FUEL SYSTEM
1
Open 2 fuel tank valves.
2
Remove fuel tank drain hull access plug.
3
Remove fuel tank outlet hose drain plug, and drain fuel into suitable
container.
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