SkyTrak 8042 Service Manual - Manual (Page 379)

Engine: Cummins QSB4.5T
7B.12 Model 8042, 10042, 10054 Legacy Rev. 10/03
4. Unlock and open rear engine door. Slowly turn the
radiator cap (1) to the first stop, and allow any
pressure to escape. Remove the radiator cap.
5. Locate the drain tube (2) and petcock (3) on the right
side of the radiator. Place a funnel (4) under the
drain tube (2) and loosen the drain petcock (3).
6. Drain the coolant into a suitable container.
7. Drain the contents of the overflow bottle (6) by
removing the hose (5) from the radiator fill neck. Use
the hose to drain the coolant into a suitable
container.
Note: On vehicles equipped with a cab heater option, a
shut off valve is installed at the engine inlet. Disconnect
hose from shut off valve to drain heater.
8. Flush the system with clean water and allow to drain
again. Upon completion, replace the hose onto the
the radiator fill neck (5) and tighten the drain
petcock (3).
9. Transfer the coolant to a container with a cover, and
label as “Used Antifreeze.” Dispose of the used
coolant at an approved recycling facility.
10. Connect the negative (-) battery cables (7) to the
batteries.
11. Turn the ignition to RUN and turn the heat control
knob to the HOT position to open the heat valve.
12. Fill the radiator completely with a 50/50 mixture of
ethylene glycol and water.
13. Replace the radiator cap (1). Add coolant to the
overflow bottle until the bottle is1/2 to 3/4 full. This
“overfilling” will compensate for any air in the cooling
system.
14. Clean any dirt or debris from the radiator fins and
core.
15. Start the engine and allow to idle for 30 seconds.
Bring engine speed up to 1500 rpm for about one
minute; inspect for leaks.
16. Allow the engine to cool.
17. The overflow bottle should be 1/4 to 1/2 full. If not, fill
to this level with a 50/50 mixture of ethylene glycol
and water.
18. Close and latch the engine door.
WARNING:
Never remove the radiator
cap while the engine is hot. The cooling
system is under pressure. Hot coolant can
cause severe burns or eye injury. Wear
protective clothing and safety glasses.
MH4690
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MH4700
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