Engine Cooling System - VK45DE: Removal & Installation Infiniti M45 III

Removal and Installation

Scheme 8

Scheme 9

Scheme 10

1. Remove the following parts: Front engine undercover (power tool). Engine room cover (RH and LH). Refer to " ENGINE ROOM COVER ". Air duct (inlet) and air cleaner case assembly. Refer to " AIR CLEANER AND AIR DUCT ".
2. Remove front grille and front grille support. Refer to " FRONT GRILLE ".
3. Drain engine coolant from radiator. Refer to , " ENGINE COOLANT ". CAUTION: Perform this step when the engine is cold. Do not spill engine coolant on drive belts.
4. Remove the A/C piping bracket from left side member, and then move the A/C piping out of the way.
5. Disconnect A/T fluid cooler hoses from radiator. Install blind plug to avoid leakage of A/T fluid.
6. Remove radiator hoses (upper and lower) and reservoir tank hose. CAUTION: Be careful not to allow engine coolant to contact drive belts.
7. Remove cooling fan assembly (1). Refer to , " COOLING FAN ". CAUTION: Do not damage or scratch radiator core when removing.
8. Remove radiator as follows: Remove mount bracket (RH and LH). Pull the radiator (1) rearward from the vehicle, and then remove the mounting bolts (3) and A/C condenser (2). NOTE: Figure shows right side. Lift up and pull the radiator (4) rearward, and then remove the mounting rubber (lower) (3) from the radiator core support (2). 1: A/C condenser ARROW: Engine front CAUTION: At this time, A/C condenser is on the lower end of radiator front surface. Minimize the movement to the rear side. Lift up the A/C condenser to disengage the lower end of front surface, and then remove the radiator. CAUTION: Be careful not to damage radiator and A/C condenser core. Minimize the lift of A/C condenser to prevent load from being applied to A/C piping. After removing the radiator, place the A/C condenser on the radiator core support to prevent load from being applied to piping. And then, temporarily secure them using a rope to prevent them from being dropped.

INSTALLATION

Installation is the reverse order of removal.

REMOVAL

1. Remove engine room cover (RH and LH). Refer to " ENGINE ROOM COVER ".
2. Remove air duct (inlet) and air cleaner case assembly. Refer to " AIR CLEANER AND AIR DUCT ".
3. Drain engine coolant from radiator. Refer to , " ENGINE COOLANT ".
4. Disconnect harness connector from cooling fan control module, and move harness to aside.
5. Remove radiator hose (upper). Refer to , " RADIATOR ".
6. Remove cooling fan assembly.

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

1. Remove following parts: Front engine undercover (power tool) Engine cover: Refer to " INTAKE MANIFOLD ". Engine room cover (RH and LH): Refer to " ENGINE ROOM COVER ". Air duct (inlet): Refer to " AIR CLEANER AND AIR DUCT ". Alternator, water pump and A/C compressor belt: Refer to " DRIVE BELTS ".
2. Drain engine coolant from drain plugs on radiator and both side of cylinder block. Refer to , " CHANGING ENGINE COOLANT " and " DISASSEMBLY ". CAUTION: Perform this step when engine is cold. Do not spill engine coolant on drive belts.
3. Remove water pump pulley.
4. Remove water pump. 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. Do not disassemble water pump.

Installation is the reverse order of removal.

1. Remove engine room cover (RH and LH). Refer to " ENGINE ROOM COVER ".
2. Remove engine cover with power tool. Refer to " INTAKE MANIFOLD ".
3. Remove air duct (inlet). Refer to " AIR CLEANER AND AIR DUCT ".
4. Drain engine coolant from drain plugs on radiator and both side of cylinder block. Refer to , " CHANGING ENGINE COOLANT " and " DISASSEMBLY ". CAUTION: Perform this step when engine is cold. Do not spill engine coolant on drive belts.
5. Disconnect water suction hose from water inlet.
6. Remove water inlet and thermostat. CAUTION: Do not disassemble thermostat.
7. Remove intake manifolds (upper and lower). Refer to " INTAKE MANIFOLD ".
8. Disconnect radiator hose (upper) from thermostat housing.
9. Disconnect heater hoses from water outlet and heater pipe.
10. Remove thermostat housing, water outlet pipe, water connector, water control valve, water outlet and heater pipe.

Scheme 11

1. Make sure that valves both in thermostat and water control valve are completely closing at normal temperature.
2. Place a thread so that it is caught in the valves of the thermostat and water control valve. Immerse fully in a container filled with water. Heat while stirring. (The example in the figure shows thermostat.)
3. The valve opening temperature is the temperature at which the valve opens and falls from the thread.
4. Continue heating. Check the maximum valve lift. NOTE: The maximum valve lift standard temperature for water control valve is the reference value.
5. After checking the maximum valve lift, lower the water temperature and check the valve closing temperature. Standard values: VALVE LIFT SPECIFICATION Thermostat Water control valve Valve opening temperature 80 - 84°C (176 - 183°F) 93.5 - 96.5°C (200 - 206°F) Maximum valve lift More than 10 mm/ 95°C (0.39 in/ 203°F) More than 8 mm/ 108°C (0.315 in/ 226°F) Valve closing temperature 77°C (171°F) 90°C (194°F)
6. If the malfunctioning condition, when closing valve at normal temperature, or measured values are out of the standard, replace thermostat and/or water control valve.

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

Scheme 12

1. Install thermostat and water control valve with the whole circumference of each flange part fit securely inside rubber ring. (The example in the figure shows thermostat.)
2. Install thermostat with jiggle valve facing upwards. (The position deviation may be within the range of +/-10 degrees)
3. Install water control valve with the up-mark facing up and the frame center part facing upwards. (The position deviation may be within the range of +/-10 degrees)

Scheme 13