Alternative Fuel Engine, 6.0 L and 6.6 L
See Fig. when performing the following procedure.
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Overflow Bottle
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Overflow Bottle Fill Neck
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Radiator Fill Neck
Fig. 1, Overflow Bottle
Warning: Never remove the radiator cap while the engine is operating or while the engine and radiator are still hot. Scalding fluid and steam can blow out under pressure if the cap is taken off too soon. Failure to follow these precautions could result in serious personal injury from heated coolant spray.
- When the engine is cool, remove the radiator cap.Turn the cap slowly counterclockwise until it reaches a "stop." Do not press down while turning the cap. Wait until any remaining pressure (indicated by a hissing sound) is relieved, then press down on the cap and continue turning it counterclockwise.
- When the cap is removed, run the engine until the upper radiator hose is hot. This shows that the thermostat is open and that the coolant is flowing through the system.
- Shut down the engine. Remove the lower radiator hose and drain the coolant. Draining may be speeded up by removing the plug from the bottom of the water inlet.
- Connect the lower radiator hose and install the plug in the bottom of the water inlet. Add water until the system is filled and run the engine until the upper radiator hose is hot again. The system must be filled slowly to prevent air locks. Wait 2 to 3 minutes to allow air to be vented, then add water to bring the level to the top.
- Repeat the last two steps several times until the drained liquid is nearly colorless.
- Drain the system, then close the radiator and block the drain valves.
- Disconnect the hose from the coolant overflow bottle. Remove the bottle and pour out any fluid. Scrub and clean the inside of the overflow bottle with soap and water. Flush it thoroughly with clean water, then drain it. Reinstall the overflow bottle and hoses.
- Fill the system with a 50/50 mixture of antifreeze and
water to the base of the filler neck. Refer to the coolant label on
the vehicle or the engine manufacturer’s service literature
for approved coolants. Coolant used must be compatible with the engine
manufacturer’s coolant specifications.For Cummins engine service
literature, refer to the Cummins Online website, see https://www.cummins.com/support/manuals or scan the QR code. See Fig.. For Detroit™ engine service
literature, refer to the Detroit Diesel link on the DTNA TechLit
website, see https://www.dtnatechlit.com/portal-public or scan
the QR code. See Fig..
Fig. 2, Cummins QR Code
Fig. 3, TechLit QR Code
- With the radiator cap removed, start the engine and run it at low idle for 60 seconds. Increase engine speed to 1200 rpm for 60 seconds, then decrease engine speed to low idle for 60 seconds. Top off the coolant level to the base of the radiator fill neck. Install the radiator cap. Fill the coolant overflow bottle to the COLD MAX line. Install the cap on the overflow bottle. Shut down the engine.
Notice: During filling, air must be vented from the engine coolant passages. Any air trapped in the system can cause severe engine damage.
Note: The maximum fill rate of the radiator is 2 gallons per minute.
Note: The maximum fill rate of the radiator is 2 gallons per minute.