Engine Cooling System (MR20DE): Other Nissan Sentra B16 рестайлинг

Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER"

The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.

Information necessary to service the system safely is included in SUPPLEMENTAL RESTRAINT SYSTEM and SEAT BELTS articles.

PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS

Precaution Necessary for Steering Wheel Rotation After Battery Disconnect

Note. This Procedure is applied only to models with Intelligent Key system and NATS (NISSAN ANTI-THEFT SYSTEM). Remove and install all control units after disconnecting both battery cables with the ignition knob in the "LOCK" position. Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.

If DTC is detected, perform trouble diagnosis according to self-diagnostic results.

For models equipped with the Intelligent Key system and NATS, an electrically controlled steering lock mechanism is adopted on the key cylinder.

For this reason, if the battery is disconnected or if the battery is discharged, the steering wheel will lock and steering wheel rotation will become impossible.

If steering wheel rotation is required when battery power is interrupted, follow the procedure below before starting the repair operation.

Special Service Tool

The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.

SPECIAL SERVICE TOOL REFERENCE Tool number (Kent-Moore No.) Tool name Description WS39930000 (-) Tube pressure Pressing the tube of liquid gasket EG17650301 (J-33984-A) Radiator cap tester adapter Adapting radiator cap tester to radiator cap and radiator filler neck 28 (1.10) dia. 31.4 (1.236) dia. 41.3 (1.626) dia. Unit: mm (in) KV10111100 (J-37228) Seal cutter Removing chain tensioner cover and water pump cover KV991J0070 (J-45695) Coolant Refill Tool Refilling engine cooling system - (J-23688) Engine coolant refractometer Checking concentration of ethylene glycol in engine coolant

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Commercial Service Tool

COMMERCIAL SERVICE TOOL REFERENCE Tool name Description Power tool Loosening bolts and nuts Radiator cap tester Checking radiator and radiator cap

Scheme 22

CHECKING COOLING SYSTEM HOSES

Check hoses for the following

1. Improper attachment
2. Leaks
3. Cracks
4. Damage
5. Loose connections
6. Chafing
7. Deterioration

Scheme 23

1. Check if the reservoir tank engine coolant level is within the MIN to MAX range when the engine is cool.
2. Adjust the engine coolant level as necessary.

CHECKING COOLING SYSTEM FOR LEAKS

To check for leaks, apply pressure to the cooling system using suitable tool and Tool.

Tool number : EG17650301 (J-33984-A)

Testing pressure : 157 kPa (1.6 kg/cm 2 , 23 psi)

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1. Inspect the radiator cap. Replace the cap if the metal plunger cannot be seen around the edge of the black rubber gasket. Replace the cap if deposits of waxy residue or other foreign material are on the black rubber gasket or the metal retainer. NOTE: Thoroughly wipe out the radiator filler neck to remove any waxy residue or foreign material.
2. 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.
3. Check radiator cap relief pressure using suitable tool and Tool. Tool number : EG17650301 (J-33984-A) Standard: 78 - 98 kPa (0.8 - 1.0 kg/cm 2 , 11 - 14 psi) When connecting the radiator cap to the tester, apply water or coolant to the cap seal surface. 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.

CHECKING RADIATOR

Check radiator for mud or clogging. If necessary, clean radiator as follows.

1. Be careful not to bend or damage the radiator fins.
2. When radiator is cleaned without removal, remove all surrounding parts such as cooling fan shroud and horns. Then tape the harness and electrical connectors to prevent water from entering.

1. Apply water by hose to the back side of the radiator core, with the hose pointed vertically downward.
2. Apply water again to all radiator core surfaces once per minute.
3. Stop washing if any stains no longer flow out from the radiator.
4. Blow air into the back side of radiator core, with the air hose pointed vertically downward. Use compressed air lower than 490 kPa (5 kg/cm 2 , 71 psi) and keep distance more than 30 cm (11.8 in).
5. Blow air again into all the radiator core surfaces once per minute until no water sprays out.
6. Check for leaks.

Changing Engine Coolant

Scheme 27

1. Remove the engine under cover. Refer to " «REMOVAL AND INSTALLATION»(ref-367309-S07728457182010072700000) ".
2. Open the radiator drain plug (1) at the bottom of the radiator, and remove the radiator filler cap. This is the only step required when partially draining the cooling system (radiator only). <= Front CAUTION: Perform this step when engine is cold. Do not spill engine coolant on drive belt.
3. Follow this step for heater core removal/replacement only. Disconnect the upper heater hose at the engine side and apply moderate air pressure [103.46 kPa (15 psi, 1.055 kg/cm 2 ) maximum air pressure] into the hose for 30 seconds to blow the excess coolant out of the heater core.
4. When draining all of the coolant in the system, remove the reservoir tank and drain the coolant, then clean the reservoir tank before installation.
5. When draining all of the coolant in the system for engine removal or repair, open the drain plug on the cylinder block. Refer to " «COMPONENT»(ref-367306-S28720226612010072700000) ".
6. Check the drained engine coolant for contaminants such as rust, corrosion or discoloration. If the coolant is contaminated, flush the engine cooling system. Follow the " «FLUSHING COOLING SYSTEM»(ref-367308-S30435186222010072700000) " procedure.

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1. Install the radiator drain plug. Install the reservoir tank and cylinder block drain plug, if removed for a total system drain or for engine removal or repair. The radiator must be completely empty of coolant and water. Apply sealant to the threads of the cylinder block drain plugs. Use Genuine High Performance Thread Sealant or equivalent. Refer to " «RECOMMENDED CHEMICAL PRODUCT AND SEALANT»(ref-367300-S11705964442010072700000) ". Radiator drain plug : Refer to " «COMPONENT»(ref-367308-S36236308522010072700000) ". Cylinder block drain plug : Refer to " «REMOVAL AND INSTALLATION»(ref-367322-S41249865712010072700000) ".
2. If disconnected, reattach the upper radiator hose at the engine side.
3. Set the vehicle heater controls to the full HOT and heater ON position. Turn the vehicle ignition ON with the engine OFF as necessary to activate the heater mode.
4. Install the Tool by installing the radiator cap adapter onto the radiator neck opening. Then attach the gauge body assembly with the refill tube and the venturi assembly to the radiator cap adapter. Tool number : KV991J0070 (J-45695)
5. Insert the refill hose into the coolant mixture container that is placed at floor level. Make sure the ball valve is in the closed position. Use Genuine NISSAN Long Life Anti-freeze coolant or equivalent, mixed 50/50 with distilled water or demineralized water. Refer to " «ANTI-FREEZE COOLANT MIXTURE RATIO»(ref-367307-S01440857592010072700000) ". Engine coolant capacity (with reservoir tank) : Refer to «RECOMMENDED FLUIDS AND LUBRICANTS»(ref-367307-S27183005892010072700000) .
6. Install an air hose to the venturi assembly, the air pressure must be within specification. Compressed air supply pressure : 549 - 824 kPa (5.6 - 8.4 kg/cm 2 , 80 - 119 psi) CAUTION: The compressed air supply must be equipped with an air dryer.
7. The vacuum gauge will begin to rise and there will be an audible hissing noise. During this process open the ball valve on the refill hose slightly. Coolant will be visible rising in the refill hose. Once the refill hose is full of coolant, close the ball valve. This will purge any air trapped in the refill hose.
8. Continue to draw the vacuum until the gauge reaches 28 inches of vacuum. The gauge may not reach 28 inches in high altitude locations, use the vacuum specifications below based on the altitude above sea level. Altitude above sea level Vacuum gauge reading 0 - 100 m (328 ft) : 28 inches of vacuum 300 m (984 ft) : 27 inches of vacuum 500 m (1,641 ft) : 26 inches of vacuum 1,000 m (3,281 ft) : 24 - 25 inches of vacuum
9. When the vacuum gauge has reached the specified amount, disconnect the air hose and wait 20 seconds to see if the system loses any vacuum. If the vacuum level drops, perform any necessary repairs to the system and repeat steps 6 - 8 to bring the vacuum to the specified amount. Recheck for any leaks.
10. Place the coolant container (with the refill hose inserted) at the same level as the top of the radiator. Then open the ball valve on the refill hose so the coolant will be drawn up to fill the cooling system. The cooling system is full when the vacuum gauge reads zero. CAUTION: Do not allow the coolant container to get too low when filling, to avoid air from being drawn into the cooling system.
11. Remove the Tool from the radiator neck opening.
12. Fill the cooling system reservoir tank to the specified level and install the radiator cap. Run the engine to warm up the cooling system and top up the system as necessary.

Thermostat

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1. Install thermostat while making rubber ring (1) groove fit to thermostat flange (A) around the whole circumference.
2. Install thermostat (1) into the thermostat housing (2) with jiggle valve (A) facing upwards.

Thermostat Housing

1. Securely insert the rubber ring into the mating groove of thermostat housing and install it.
2. Install the thermostat housing to the cylinder block without displacing the gasket from the gasket position.

Water Control Valve

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1. Install water control valve while making rubber ring (1) groove fit to water control valve flange (A) around the whole circumference.
2. While the mark (A) points to up, install water control valve (2) with frame center (B) facing straight upward into water outlet (1).

Water Outlet

Install the water control valve to the cylinder head without displacing the valve from the valve position.

Water Hoses (M/T Models)

Install water hoses (3),(5) as shown in illustration.

Scheme 34

1. Electric throttle control actuator (1)
2. Clamp (2)
3. Water outlet (4)
4. Paint mark (A)
5. Clamp shall not interfere with the bulged area (B)
6. <=: Engine front

Water Hoses (CVT Models)

Install water hoses (3),(5) as shown in illustration.

Scheme 35

1. Electric throttle control actuator (1)
2. Clamp (2)
3. Water outlet (4)
4. Paint mark (A)
5. Clamp shall not interfere with the bulged area (B)
6. <=: Engine front

THERMOSTAT SPECIFICATION

WATER CONTROL VALVE SPECIFICATION

RADIATOR

RADIATOR SPECIFICATION