Engine Cooling System: Removal & Installation Infiniti M45 II

REMOVAL OF LIQUID GASKET SEALING

1. After removing the mounting bolts and nuts, separate the mating surface using a seal cutter and remove the liquid gasket sealing.

1. In areas where the cutter is difficult to use, use a plastic hammer to lightly tap the area where the liquid gasket is applied.

Scheme 1

Scheme 2

Scheme 3

Scheme 4

1. Using a scraper, remove the old liquid gasket adhering to the gasket application surface and the mating surface. Remove the liquid gasket completely from the groove of the liquid gasket application surface, mounting bolts, and bolt holes.
2. Wipe the liquid gasket application surface and the mating surface with white gasoline (lighting and heating use) to remove adhering moisture, grease and foreign materials.
3. Attach the liquid gasket tube to the tube presser. Use Genuine RTV Silicone Sealant or equivalent. Refer to "RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS " .
4. Apply the liquid gasket without breaks to the specified location with the specified dimensions. If there is a groove for the liquid gasket application, apply the liquid gasket to the groove. As for the bolt holes, normally apply the liquid gasket inside the holes. Occasionally, it should be applied outside the holes. Within five minutes of liquid gasket application, install the mating component. If the liquid gasket protrudes, wipe it off immediately. Do not retighten after the installation. After 30 minutes or more have passed from the installation, fill the engine oil and engine coolant. CAUTION: If there are specific instructions, observe them.

Removal and Installation

Scheme 5

Scheme 6

1. Drain engine coolant from the radiator. Refer to " «CHANGING ENGINE COOLANT»(ref-181178-S24700179582005080100000) ".
2. Remove cooling fan shroud. Refer to " «REMOVAL AND INSTALLATION»(ref-181178-S24284457122005080100000) ".
3. Remove A/T oil cooler hoses. Install blind plug to avoid leakage of A/T fluid.
4. Remove bolts of both right/left end of radiator core (2 bolts for each).
5. Lift the air conditioner condenser up approximately 2 cm (0. 79 in). Remove the clips from the right and left flange parts of the air conditioner condenser.
6. Lift up and remove the radiator. CAUTION: Do not damage or scratch radiator core when removing. After removing the radiator, fix the air conditioner condenser on the vehicle side with a rope or similar means. This is to prevent a load being applied to the air conditioner piping.

INSTALLATION

1. Install in the reverse order of removal.
2. Align ID marks to install clips of both right/left end of radiator core. Refer to radiator component illustration on top page.

Scheme 7

Scheme 8

1. Pull the negative pressure valve to open it, and check that it closes completely when released. Check that there is no dirt or damage on the valve seat of the radiator cap negative-pressure valve. Check that there are no abnormalities in the opening and closing conditions of the negative-pressure valve.
2. Check radiator cap relief pressure. Standard : 78 - 98 kPa (0. 8 - 1. 0 kg/cm 2 , 11 - 14 psi) Limit : 59 kPa (0. 6 kg/cm 2 , 9 psi) When connecting the radiator cap to the radiator cap tester adapter (SST) and radiator cap tester, apply water or LLC to the cap seal part. Replace the radiator cap if there is an abnormality in the negative-pressure valve, or if the open-valve pressure is outside of the standard values.

REMOVAL

1. Remove air duct and air cleaner case. Refer to "Removal and Installation ".
2. Remove engine undercover with power tool.
3. Drain engine coolant from the radiator. Refer to " «CHANGING ENGINE COOLANT»(ref-181178-S24700179582005080100000) ". CAUTION: Perform when the engine is cold. Never remove the radiator cap when the engine is hot. Serious burns could occur from high pressure fluid escaping from the radiator.
4. Disconnect the radiator hoses (upper/lower).
5. Remove the following parts from the fan shroud: coolant temperature sensor harness, coolant reservoir tank hose, A/T oil cooler hose, mounting bolts for the cooling fan fluid hose bracket.
6. Drain the cooling fan fluid. Because there is no drain plug on the reservoir tank or piping, drain the fluid from the reservoir tank oil inlet and pipe division points. Prepare a container with a volume of approximately 1 l (2-1/8 US pt, 1-3/4 Imp pt) to drain the fluid into.
7. Remove the cooling fan fluid reservoir tank.
8. Disconnect the hoses between the cooling fan motor and cooling fan pump (joined with the water pump), and the hose between the cooling fan motor and the oil cooler. Fluid will leak, so have shop cloths ready.
9. Remove the cooling fan shroud mounting bolts.
10. Remove the radiator mounting bracket. With the radiator moved toward the vehicle front, lift up and remove the cooling fan. CAUTION: Be careful not to scratch or damage the radiator core. When removing the cooling fan pump, remove it together with the water pump. (They can not be separated.) Refer to " «REMOVAL AND INSTALLATION»(ref-181178-S15365028622005080100000) ". When removing the cooling fan fluid cooler, be careful not to scratch or damage the air conditioner condenser core.

Install in the reverse order of removal referring the following.

1. For bleeding the air from the cooling system, refer to " «REFILLING ENGINE COOLANT»(ref-181178-S27520643502005080100000) ".

Attaching the fluid pipe fixing clip

If the fluid pipe fixing clip has been removed from the installation holes, it must be replaced with a new clip.

Adding cooling fan fluid and bleeding air

The procedure below is for adding cooling fan fluid and bleeding air from the piping.

Note. The total fluid volume is 777 ml (26. 3 US floz, 27. 4 Imp floz) (with the cold maximum on the level gauge when the engine is cold).

Scheme 9

1. Add fluid to the reservoir tank until the fluid reaches the upper limit of the "HOT" level on the level gauge. For the fluid level, refer to " «INSPECTION AFTER INSTALLATION»(ref-181178-S32576783842005080100000) ".
2. Start the engine.
3. Run the engine at idle speed for a few minutes. Then check the fluid level. If the level has decreased, add fluid. CAUTION: Be careful not to touch the fan while it is rotating. Be sure to add fluid as necessary. If the fluid runs out in the reservoir tank, air will be taken in. NOTE: With the engine operating, the reservoir tank cap can be removed to check the fluid level. Immediately after starting, certain noise will come from the fluid pump. This is caused by air taken in to the piping and will gradually disappear.
4. Continue with step 3 until the level of the fluid stops decreasing.
5. Stop the engine and disconnect the harness connector for the cooling fan speed control solenoid valve. NOTE: When the solenoid valve harness is disconnected, the fan will operate at full speed.
6. Start the engine. Repeat step 3 until the fluid level stops decreasing and air bubbles stop coming out.
7. Stop the engine. Connect the harness connector for the cooling fan speed control solenoid valve.

Scheme 10

1. Check that there is no fluid leakage from any hose connection or any other part.
2. Check the fluid level with the level gauge on the reservoir tank cap. If there is too much or too little, adjust the amount of fluid.
3. Check that under the fluid temperature conditions below, the fluid level is within the "COLD" or "HOT" range on the level gauge. COLD : Fluid temperature 0 - 30 °C (32 - 86 °F) HOT : Fluid temperature 50 - 80 °C (122 - 176 °F) NOTE: There is no specified timing for replacing the fluid. Refer to "DTC P1480 COOLING FAN SPEED CONTROL SOLENOID VALVE " for control of cooling fan.

Scheme 11

Scheme 12

1. Remove fan. CAUTION: Reverse screws are used for the fan attachment nuts. When removing or attaching, turn the nut the opposite way as for a normal screw. Do not remove the balancer clip from the fan. For the case if the balancer clip is removed, make an alignment mark for the installation position on the fan side.
2. Remove cooling fan motor from cooling fan shroud.

Scheme 13

1. Drain engine coolant so that no engine coolant comes out from water pump fitting hole.
2. Remove below the parts. Engine undercover Air duct and engine room cover For removing engine room cover, refer to "Removal and Installation ". CAUTION: Leave the fixed auto tensioner pulley in its fixed position when removing the drive belt. Alternator, water pump and A/C compressor belt. For removing drive belt, refer to "Removal and Installation ".
3. Disconnect the harness connector for the cooling fan speed control solenoid valve (joined with the water pump).
4. Remove the water pump pulley.
5. Disconnect the cooling fan fluid hose. Because there is no drain plug, drain the fluid from the hose separation point. Prepare a receptacle with a volume of approximately 1 l (2-1/8 US pt, 1-3/4 Imp pt).
6. Remove the water pump. Engine coolant will leak from the cylinder block, so have a receptacle ready below. CAUTION: Handle the water pump vane so that it does not contact any other parts. Do not disassemble the water pump (including the cooling fan pump and cooling fan speed control solenoid valve).

Scheme 14

1. Visually check that there is no significant dirt or rusting on the water pump body and vane.
2. Check that there is no looseness in the vane shaft, and that it turns smoothly when rotated by hand.
3. Visually check that there is no fluid leakage from the cooling fan pump part and the cooling fan speed control solenoid valve part.
4. If there are any unusualness, replace the water pump assembly.

1. Install in the reverse order of removal.
2. Apply Genuine Nissan Power Steering Fluid II (the cooling fan fluid) or equivalent to the O-ring of the cooling fan fluid hose (on the feed side). Then insert the O-ring to the water pump so that it does not come out of the attachment groove.
3. For bleeding the air from the cooling system, refer to " «REFILLING ENGINE COOLANT»(ref-181178-S27520643502005080100000) ".
4. For bleeding the air from the cooling fan fluid, refer to " «INSTALLATION»(ref-181178-S28799179172005080100000) ".

Scheme 15

Removal of Thermostat

1. Drain engine coolant from the radiator. Refer to " «CHANGING ENGINE COOLANT»(ref-181178-S24700179582005080100000) ".
2. Remove air duct and engine room cover. For removing engine room cover, refer to "ENGINE ROOM COVER ".
3. Remove water suction hose from water inlet side.
4. Remove water inlet and thermostat.

Removal of Water Control Valve

1. Remove engine room cover with power tool. Refer to "ENGINE ROOM COVER ".
2. Disconnect heater hose (heater core side).
3. Remove heater hose bracket.
4. Remove vacuum tank.
5. Remove water connector and water control valve.

Scheme 16

1. 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 the thermostat.)
2. The valve opening temperature is the temperature at which the valve opens and falls from the thread.
3. Continue heating. Check the full-open lift amount. NOTE: The full-open lift amount standard temperature for the water control valve is the reference value.
4. After checking the full-open lift amount, lower the water temperature and check the valve closing temperature.

Scheme 17

Install in the reverse order of removal.

Installation of thermostat and water control valve

Scheme 18

Scheme 19

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

Installation of water outlet pipe and heater pipe

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

Scheme 20

Scheme 21

Scheme 22

Scheme 23

Scheme 24