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Engine Cooling System (VK50VE): Removal & Installation Infiniti FX50 II

Cooling System (Mechanical) 8 illustrations ~790 words

REMOVAL

WARNINGNever remove radiator cap when engine is hot. Serious burns could occur from high-pressure engine coolant escaping from water inlet. Wrap a thick cloth around the cap. Slowly turn it a quarter of a turn to release built-up pressure. Carefully remove radiator cap by turning it all the way.

Scheme 7

Scheme 7
Scheme 7

Scheme 8

Scheme 8
Scheme 8

Scheme 9

Scheme 9
Scheme 9

Scheme 10

Scheme 10
Scheme 10
  1. Remove the following parts: Engine under cover with power tool. Engine cover and engine room cover (RH and LH): Refer to «EXPLODED VIEW»(ref-368868-S19442311672010081300000) . Air cleaner case: Refer to «EXPLODED VIEW»(ref-368868-S08552748242010081300000) . Air duct (inlet): Refer to «EXPLODED VIEW»(ref-368868-S08552748242010081300000) . Hood lock stay assembly and horn: Refer to «EXPLODED VIEW»(ref-368903-S26550917982010081300000) and «EXPLODED VIEW»(ref-368908-S12487376492010081300000) .
  2. Remove condenser. Refer to «EXPLODED VIEW»(ref-368877-S26669634392010081300000) .
  3. Drain engine coolant from radiator. Refer to «DRAINING»(ref-368881-S40778601372010081300000) . CAUTION: Perform this step when the engine is cold. Never spill engine coolant on drive belts.
  4. Disconnect A/T fluid cooler hoses from radiator. Install blind plug to avoid leakage of A/T fluid.
  5. Remove radiator hoses (upper and lower) and reservoir tank hose. CAUTION: Be careful not to allow engine coolant to contact drive belts. Never loosen radiator water inlet pipe mounting screw (A). If loosened, replace radiator (1).
  6. Rotate two radiator upper mount brackets 90 degrees in direction as shown below, and remove them.
  7. Remove radiator as per the following: CAUTION: Be careful not to damage radiator core. Lift up and pull the radiator (1) forward, and then remove the mounting rubber (lower) (3) from the radiator core support (2). Remove radiator (1) from front of radiator core support (2).

INSTALLATION

Installation is the reverse order of removal.

  1. Drain engine coolant. Refer to «DRAINING»(ref-368881-S40778601372010081300000) .
  2. Remove reservoir tank. Refer to «EXPLODED VIEW»(ref-368881-S32071869332010081300000) .
  3. Remove air cleaner case. Refer to «EXPLODED VIEW»(ref-368868-S08552748242010081300000) .
  4. Remove mounting bolt from high pressure flexible hose bracket. Refer to «EXPLODED VIEW»(ref-368877-S10406692962010081300000) .
  5. Remove radiator hose (upper). Refer to «EXPLODED VIEW»(ref-368881-S32071869332010081300000) .
  6. Disconnect harness connector from cooling fan control modules, and move harness to aside.
  7. Remove cooling fan assembly. CAUTION: Be careful not to damage or scratch on radiator core.

Note the following, and install in the reverse order of removal.

CAUTIONOnly use genuine parts for cooling fan mounting bolt and observe the specified torque (to prevent radiator from being damaged).

Removal and Installation

CAUTIONWhen removing water pump assembly, be careful not to get engine coolant on drive belt. Water pump cannot be disassembled and should be replaced as a unit. After installing water pump, connect hose and clamp securely, then check for leakage using the radiator cap tester (commercial service tool) and the radiator cap tester adapter (commercial service tool).
  1. Remove following parts: Engine undercover (power tool) Engine cover, and engine room cover (RH and LH). Refer to «EXPLODED VIEW»(ref-368868-S19442311672010081300000) . Air duct (inlet): Refer to «EXPLODED VIEW»(ref-368868-S08552748242010081300000) . Reservoir tank. Refer to «EXPLODED VIEW»(ref-368881-S32071869332010081300000) .
  2. Loosen water pump pulley mounting bolts.
  3. Remove alternator, water pump and A/C compressor belt: Refer to «REMOVAL AND INSTALLATION»(ref-368868-S35367859502010081300000) .
  4. Remove water pump pulley.
  5. Drain engine coolant from drain plugs on radiator and cylinder block. Refer to «DRAINING»(ref-368881-S40778601372010081300000) and «SETTING»(ref-368868-S34036213152010081300000) . CAUTION: Perform this step when engine is cold. Never spill engine coolant on drive belt.
  6. Remove water pump. Refer to «EXPLODED VIEW»(ref-368881-S15472963732010081300000) . Engine coolant will leak from cylinder block, so have a receptacle ready under vehicle. CAUTION: Handle the water pump vane so that it does not contact any other parts. Never disassemble water pump.

Install in the reverse order of removal.

Scheme 11

Scheme 11: INSPECTION AFTER REMOVAL
Scheme 11: INSPECTION AFTER REMOVAL
  1. Visually check that there is no significant dirt or rusting on water pump body and vane (A).
  2. Check there is no slack in vane shaft, and that it turns smoothly when rotated by hand.
  3. If anything is found, replace water pump.
  1. Remove engine cover and engine room cover (RH and LH). Refer to «EXPLODED VIEW»(ref-368868-S19442311672010081300000) .
  2. Remove air duct (inlet). Refer to «EXPLODED VIEW»(ref-368868-S08552748242010081300000) .
  3. Remove reservoir tank. Refer to «EXPLODED VIEW»(ref-368881-S32071869332010081300000) .
  4. Remove engine undercover with power tool.
  5. Drain engine coolant from drain plugs on radiator and cylinder block. Refer to «DRAINING»(ref-368881-S40778601372010081300000) and «SETTING»(ref-368868-S34036213152010081300000) . CAUTION: Perform this step when engine is cold. Never spill engine coolant on drive belts.
  6. Disconnect radiator hose (upper and lower). Refer to «EXPLODED VIEW»(ref-368881-S32071869332010081300000) .
  7. Remove intake manifold. Refer to «EXPLODED VIEW»(ref-368868-S17875645502010081300000) .
  8. Remove water suction pipe and water suction hose.
  9. Remove water inlet and thermostat.
  10. Remove water connector, heater pipes and heater hoses.
  11. Remove thermostat housing.

Note the following, and install in the reverse order of removal.

CAUTIONBe careful not to spill engine coolant over engine room. Use rag to absorb engine coolant.

Thermostat

Scheme 12

Scheme 12
Scheme 12

Scheme 13

Scheme 13
Scheme 13
  1. Install thermostat with the whole circumference of each flange part (A) fit securely inside rubber ring (1).
  2. Install thermostat with jiggle valve (A) facing upwards. The position deviation may be within the range of 20 degrees (b).

Water Connector and Heater Pipe

  1. First apply a neutral detergent to O-rings, then quickly insert the insertion parts of the water connector and heater pipe into the installation holes.

Scheme 14

Scheme 14: INSPECTION AFTER REMOVAL
Scheme 14: INSPECTION AFTER REMOVAL
  1. Check that valve in thermostat is completely closing at normal temperature.
  2. Place a thread (A) so that it is caught in the valve of the thermostat. Immerse fully in a container filled with water. Heat while stirring.
  3. The valve opening temperature is the temperature at which the valve opens and falls from the thread.
  4. After checking the maximum valve lift, lower the water temperature and check the valve closing temperature. Thermostat (Standard): Refer to «THERMOSTAT»(ref-368881-S02943653772010081300000) .
  5. If the malfunctioning condition, when valve seating at ordinary room temperature, or measured values are out of the standard, replace thermostat.

More articles — Engine Cooling System (VK50VE)