Bleeding Air From Cooling System

CAUTION: Explosive release of fluids from pressurized cooling system can cause serious burns.

Shut off engine. Only remove cap when cool enough to touch with bare hands. Slowly loosen cap to first stop to relieve pressure before removing completely.

TS281
TS281-UN-23AUG88

RG14831
RG14831-UN-05APR06

EGR CoolerVent Plug

A - Plug to Bleed Air from EGR Cooler (if equipped)

IMPORTANT: Use coolant as specified in Fuel, Lubricants and Coolant section.

  1. Remove cap from top tank (de-aeration tank) of cooling system.

  2. Remove EGR cooler (if equipped) vent plug (A) from rear of cooler.

  3. Fill high pressure coolant circuit at top tank.

  4. Begin filling coolant recovery tank (if equipped).

  5. When air is purged and coolant is visible coming out of vent hole on EGR cooler (if equipped), reinstall EGR cooler vent plug and tighten to specification.

    ItemMeasurementSpecification
    EGR Cooler (if equipped) Vent Plug to CoolerTorque20 N•m (15 lb-ft)

  6. Complete filling coolant recovery tank (if equipped) to Full Hot mark.

  7. NOTE: Coolant level in recovery tank will drop the first few cycles unless there is a leak.

    Install top tank (de-aeration) cap. Start engine and run at idle for 1 to 5 minutes.

  8. Shut off and remove top tank cap. Fill high pressure circuit tank and reinstall cap.

  9. Start engine and warm up for 15 minutes. If coolant recovery tank loses coolant to ground, repeat previous step and top off top tank until coolant loss stops. Loosing coolant to ground indicates air in high pressure system is being discharged through coolant recovery tank.

  10. IMPORTANT: If coolant level does not drop below Full Hot, there is a leak in cooling system. Engine damage may result.

    Shut off engine and allow to cool. Observe coolant level dropped below Full Hot in recovery tank (if equipped).

  11. NOTE: It is normal for coolant level to go down with first few cycles and then range between Full Hot and Full Cold.

    IMPORTANT: It is normal for top (de-aeration) tank to be partially full of air when cap is removed and system completely de-aerated. When inspecting top tank, if it is at least 1/2 full, do not add additional coolant. Topping off tank may cause coolant to be expelled onto the ground and may cause coolant pump cavitation.

    Monitor coolant recovery (if equipped) tank for two days. Refill recovery tank or top tank as required.

JG50163,000028D-19-20120413