Cummins ISX11.9 CM2250 – Service Manual 008-011   Coolant Heater

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

WARNING  Do not remove the pressure cap from a hot engine. Wait until the coolant temperature is below 50°C [120°F] before removing the pressure cap. Heated coolant spray or steam can cause personal injury.

WARNING  Coolant is toxic. Keep away from children and pets. If not reused, dispose of in accordance with local environmental regulations.

• Disconnect the batteries. Refer to the OEM service manual.
• Drain the cooling system. Refer to Procedure 008-018 in Section 8.
• Disconnect the block heater electrical cord.

Remove the block heater retaining capscrews.

Remove the block heater from the cylinder block.

Clean the cup plug bore (or hole) thoroughly with a clean cloth.

Make sure there are no burrs, metal shavings, or sharp edges that can possibly cut the o-ring.

Clean the coolant heater thoroughly with a clean cloth. Make sure the heating element is free of debris and buildup. Make sure the sealing area is clean.

Check the coolant heater for cracks on the element.

Check the o-ring for cracks.

WARNING  To reduce the possibility of personal injury, due to electrical shock, do not touch the electrical supply wires or component while the testing procedure is in action.

Test the coolant heater resistance.

NOTE: The following specification is for a 220 volt coolant heater (1500 watts).

Lubricate the new heater o-ring with vegetable oil.

Install the heater with the heating element in the upward direction.

Tighten the retaining capscrew.

WARNING  Coolant is toxic. Keep away from children and pets. If not reused, dispose of in accordance with local environmental regulations.

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

• Fill the engine cooling system. Refer to Procedure 008-018 in Section 8.
• Connect the batteries. Refer to the OEM service manual.
• Operate the engine to normal operating temperature and check for leaks.