2014 Jeep Wrangler JK Factory Service Manual 07 - Cooling

PUMP, Water

DESCRIPTION

A centrifugal water pump (2) circulates coolant through the water jackets, passages, intake manifold, radiator core, cooling system hoses and heater core. The pump is driven from the engine crankshaft by a single serpentine main drive belt.

The water pump impeller is pressed onto the rear of a shaft that rotates in bearings pressed into the housing. The housing has two small holes to allow seepage to escape. The water pump seals are lubricated by the antifreeze in the coolant mixture. No additional lubrication is necessary.

The water pump (1) is mounted directly to the timing chain cover and is equipped with a non serviceable integral pulley.

WATER PUMP

The water pump is used to circulate coolant through the cooling system. The coolant is pumped through the engine block, cylinder head, heater core, EGR cooler, viscous heater, and radiator.

WATER PUMP


LOOSE IMPELLER



NOTE:

Due to the design of the engine water pumps, testing the pump for a loose impeller must be done by verifying coolant flow in the radiator. To accomplish this refer to the following procedure.

DO NOT WASTE reusable coolant. If solution is clean, drain coolant into a clean container for reuse.

  1. Drain coolant until the first row of cores is visible in the radiator (Refer to 07 - Cooling - Standard Procedure) .

    2.  
  2. Leaving the radiator cap off, start the engine. Run engine until thermostat opens.

    3.  
  3. While looking into the radiator through the radiator fill neck, raise engine rpm to 2000 RPM. Observe the flow of coolant from the first row of cores.

    4.  
  4. If there is no flow or very little flow visible, replace the water pump.

    5.  

INSPECTING FOR INLET RESTRICTIONS

Inadequate heater performance may be caused by a metal casting restriction in the heater hose inlet.

DO NOT WASTE reusable coolant. If solution is clean, drain the coolant into a clean container for reuse.

WARNING:

Do not loosen the radiator draincock with the system hot and under pressure. Serious burns from the coolant can occur.

  1. Drain sufficient coolant from the radiator to decrease the level below the heater hose inlet.

    2.  
  2. Remove the heater hose.

    3.  
  3. Inspect the inlet for metal casting flash or other restrictions.

    4.  

STANDARD PROCEDURE - COOLANT AIR EVACUATION

Evacuating or purging air from the cooling system involves the use of a pressurized air operated vacuum generator. The vacuum created allows for a quick and complete coolant refilling while removing any airlocks present in the system components.



NOTE:

To avoid damage to the cooling system, ensure that no component would be susceptible to damage when a vacuum is drawn on the system.

WARNING:

ANTIFREEZE IS AN ETHYLENE GLYCOL BASE COOLANT AND IS HARMFUL IF SWALLOWED OR INHALED. IF SWALLOWED, DRINK TWO GLASSES OF WATER AND INDUCE VOMITING. IF INHALED, MOVE TO FRESH AIR AREA. SEEK MEDICAL ATTENTION IMMEDIATELY. DO NOT STORE IN OPEN OR UNMARKED CONTAINERS. WASH SKIN AND CLOTHING THOROUGHLY AFTER COMING IN CONTACT WITH ETHYLENE GLYCOL. KEEP OUT OF REACH OF CHILDREN. DISPOSE OF GLYCOL BASED COOLANT PROPERLY. CONTACT YOUR DEALER OR GOVERNMENT AGENCY FOR LOCATION OF COLLECTION CENTER IN YOUR AREA. DO NOT OPEN A COOLING SYSTEM WHEN THE ENGINE IS AT OPERATING TEMPERATURE OR HOT UNDER PRESSURE; PERSONAL INJURY CAN RESULT. AVOID RADIATOR COOLING FAN WHEN ENGINE COMPARTMENT RELATED SERVICE IS PERFORMED; PERSONAL INJURY CAN RESULT.

WARNING:

WEAR APPROPRIATE EYE AND HAND PROTECTION WHEN PERFORMING THIS PROCEDURE.


NOTE:

The service area where this procedure is performed should have a minimum shop air requirement of 80 PSI (5.5 bar) and should be equipped with an air dryer system.


NOTE:

For best results, the radiator should be empty. The vehicle's heater control should be set to the heat position (ignition may need to be turned to the on position but do not start the motor).

  1. Refer to the Chrysler Pentastar Service Equipment (Chrysler PSE) Coolant Refiller #85-15-0650 or equivalent tool's operating manual for specific assembly steps.

    2.  
  2. Choose an appropriate adapter cone that will fit the vehicle's radiator filler neck or reservoir tank.

    3.  
  3. Attach the adapter cone (2) to the vacuum gauge (1).

    4.  
  4. Make sure the vacuum generator/venturi ball valve (3) is closed and attach an airline hose (2) (minimum shop air requirement of 80 PSI/5.5 bar) to the vacuum generator/venturi (1).

    5.  
  5. Position the adaptor cone/vacuum gauge assembly into the radiator filler neck or reservoir tank. Ensure that the adapter cone is sealed properly.

    6.  
  6. Connect the vacuum generator/venturi (2) to the positioned adaptor cone/vacuum gauge assembly (1).

    7.  
  7. Open the vacuum generator/venturi ball valve.

    NOTE:

    Do not bump or move the assembly as it may result in loss of vacuum. Some radiator overflow hoses may need to be clamped off to obtain vacuum.


    8.  
  8. Let the system run until the vacuum gauge shows a good vacuum through the cooling system. Refer to the tool's operating manual for appropriate pressure readings.

    NOTE:

    If a strong vacuum is being created in the system, it is normal to see the radiator hoses to collapse.


    9.  
  9. Close the vacuum generator/venturi ball valve.

    10.  
  10. Disconnect the vacuum generator/venturi and airline from the adaptor cone/vacuum gauge assembly.

    11.  
  11. Wait approximately 20 seconds, if the pressure readings do not move, the system has no leaks. If the pressure readings move, a leak could be present in the system and the cooling system should be checked for leaks and the procedure should be repeated.

    12.  
  12. Place the tool's suction hose into the coolant's container.

    NOTE:

    Ensure there is a sufficient amount of coolant, mixed to the required strength/protection level available for use. For best results and to assist the refilling procedure, place the coolant container at the same height as the radiator filler neck. Always draw more coolant than required. If the coolant level is too low, it will pull air into the cooling system which could result in airlocks in the system.


    13.  
  13. Connect the tool's suction hose (1) to the adaptor cone/vacuum gauge assembly (2).

    NOTE: View typical

    14.  
  14. Open the suction hose's ball valve to begin refilling the cooling system.

    15.  
  15. When the vacuum gauge reads zero, the system is filled.

    NOTE:

    On some remote pressurized tanks, it is recommended to stop filling when the proper level is reached.


    16.  
  16. Close the suction hose's ball valve and remove the suction hose from the adaptor cone/vacuum gauge assembly.

    17.  
  17. Remove the adaptor cone/vacuum gauge assembly from the radiator filler neck or reservoir tank.

    18.  
  18. With heater control unit in the HEAT position, operate engine with container cap in place.

    19.  
  19. After engine has reached normal operating temperature, shut engine off and allow it to cool. When engine is cooling down, coolant will be drawn into the radiator from the pressure container.

    20.  
  20. Add coolant to the recovery bottle/container as necessary. Only add coolant to the container when the engine is cold. Coolant level in a warm engine will be higher due to thermal expansion. Add necessary coolant to raise container level to the COLD MINIMUM mark after each cool down period.

    21.  
  21. Once the appropriate coolant level is achieved, attach the radiator cap or reservoir tank cap.

    22.  

3.6L

NOTE:

The water pump on 3.6L engines is bolted directly to the engine timing chain case cover.

  1. Disconnect negative battery cable from battery.

    2.  
  2. Disconnect the intake air temperature sensor (2).

    3.  
  3. Loosen the clamps (1, 4). Remove the air intake hose and resignator (3) assembly .

    4.  
  4. Drain the cooling system (Refer to 07 - Cooling - Standard Procedure) .

    5.  
  5. Remove the accessory drive belt (Refer to 07 - Cooling/Accessory Drive/BELT, Serpentine - Removal) .

    WARNING:

    Constant tension hose clamps are used on most cooling system hoses. When removing or installing, use only tools designed for servicing this type of clamp. Always wear safety glasses when servicing constant tension clamps.


    CAUTION:

    A number or letter is stamped into the tongue of constant tension clamps (4). If replacement is necessary, use only an original equipment clamp with matching number or letter.


    6.  
  6. Remove the lower heater hose (1) at the water pump and position aside.

    7.  
  7. Remove the lower radiator hose (3) from the water pump and position aside.

    8.  
  8. Remove idler pulley (4) (Refer to 07 - Cooling/Accessory Drive/PULLEY, Idler - Removal) .

    9.  
  9. Remove the eleven water pump mounting bolts. Take notice to the four water pump bolts (2) that bolt directly to the timing cover.

    CAUTION:

    Do not pry on the water pump at the timing chain case/cover. The machined surfaces may be damaged resulting in leaks.


    10.  
  10. Remove water pump (1) and seal.

    11.  

2.8L

  1. Disconnect the negative battery cable.

    2.  
  2. Remove the radiator fan (Refer to 07 - Cooling/Engine/FAN, Cooling - Removal) .

    3.  
  3. Drain the cooling system (Refer to 07 - Cooling - Standard Procedure) .

    4.  
  4. Remove the timing belt (Refer to 09 - Engine/Valve Timing/BELT, Timing/Removal) .

    5.  
  5. Remove the inner timing cover.

    6.  
  6. Remove bolts and the pump assembly.

    7.  

CLEANING

Clean the gasket mating surface. Use caution not to damage the gasket sealing surface.

INSPECTION

Inspect the water pump assembly for cracks in the housing, Water leaks from shaft seal, loose or rough turning bearing or impeller rubbing either the pump body or timing chain case/cover.

3.6L

  1. Clean mating surfaces.

    NOTE:

    Take notice the lengths of the mounting bolts. Some M6 bolts mount directly to the timing cover (2).


    2.  
  2. Using a new gasket, position water pump (1) and hand tighten the M6 mounting bolts.

    3.  
  3. Hand tighten the idler pulley (4) bolt.

    4.  
  4. Hand tighten the upper M8 and M10 water pump to engine block mounting bolts.



    NOTE:

    Tightening the water pump fasteners in sequential order, will insure proper sealing surface.


    5.  
  5. Tighten the bolts 1 - 12 in the sequence shown. Tighten the bolts to their respective torque:

    • Tighten M6 mounting bolts to 12 N·m (9 ft. lbs.).
    • Tighten M8 bolts to 25 N·m (18 ft. lbs.).
    • Tighten M10 bolt to 55 N·m (41 ft. lbs.).
    • Repeat the tightening sequence until the proper torque has been met.

    6.  
  6. Spin water pump to be sure that pump impeller does not rub against timing chain case/cover.

    CAUTION:

    A number or letter is stamped into the tongue of constant tension clamps (4). If replacement is necessary, use only an original equipment clamp with matching number or letter.


    7.  
  7. Install the lower radiator hose (2).

    8.  
  8. Install the lower return heater hose (1).

    CAUTION:

    When installing the serpentine accessory drive belt, belt must be routed correctly. If not, engine may overheat due to water pump rotating in wrong direction.


    9.  
  9. Install accessory drive belt (4) (Refer to 07 - Cooling/Accessory Drive/BELT, Serpentine - Installation) .

    10.  
  10. Evacuate air and refill cooling system. (Refer to 07 - Cooling - Standard Procedure) .

    11.  
  11. Install the air intake hose and resignator (3) assembly at the air filter housing (4).

    12.  
  12. Connect the intake air temperature sensor (2).

    13.  
  13. Connect negative battery cable.

    14.  
  14. Check the cooling system for leaks (Refer to 07 - Cooling - Diagnosis and Testing) .

    15.  

2.8L

  1. Clean mating surfaces of water pump housing and engine block as necessary.

    2.  
  2. Place a new O-ring seal in the groove in water pump housing.

    3.  
  3. Install the water pump. Tighten bolts to 32 N·m (24 ft. lbs.).

    4.  
  4. Install the inner timing cover. Tighten bolts to 11 N·m (97 in. lbs.).

    5.  
  5. Install the timing belt (Refer to 09 - Engine/Valve Timing/BELT, Timing/Installation) .

    6.  
  6. Install the radiator fan (Refer to 07 - Cooling/Engine/FAN, Cooling - Installation) .

    7.  
  7. Evacuate air and refill cooling system (Refer to 07 - Cooling/Engine/PUMP, Water - Standard Procedure) .

    8.  
  8. Connect the negative battery cable.

    9.  
  9. Check cooling system for leaks (Refer to 07 - Cooling - Diagnosis and Testing) .

    10.