Engine Cooling System: Removal & Installation Nissan Quest IV

REMOVAL

Note. When removing components such as hoses, tubes/lines, etc., cap or plug openings to prevent fluid from spilling.

Scheme 9

1. Drain engine coolant from radiator. Refer to " «DRAINING»(ref-672622-S03082931862014112400000) ". CAUTION: Perform this step when the engine is cold. Never spill engine coolant on drive belt.
2. Remove the following parts: Air duct (inlet): Refer to " «EXPLODED VIEW»(ref-672620-S30704453622014112400000) ". Front grille: Refer to " «EXPLODED VIEW»(ref-672623-S00574874582014112400000) ". Hood lock: Refer to " «HOOD LOCK: REMOVAL AND INSTALLATION»(ref-672619-S24588708002014112400000) ".
3. Disconnect reservoir tank hose from radiator pipe (upper).
4. Disconnect CVT fluid cooler hoses from radiator. Install blind plug to avoid leakage of CVT fluid.
5. Separate low pressure flexible hose from low pressure pipe and move the separated hose. Refer to " «LOW-PRESSURE FLEXIBLE HOSE: REMOVAL AND INSTALLATION»(ref-672613-S14563742322014112400000) ".
6. Remove radiator cap adapter and each radiator hoses (upper and lower) and radiator pipe (upper) assembly. CAUTION: Be careful not to allow engine coolant to contact drive belt.
7. Remove condenser. Refer to " «EXPLODED VIEW»(ref-672613-S09693576242014112400000) ". CAUTION: Be careful not to damage condenser core.
8. Remove each radiator upper clips (2) by pulling the tabs (A) outside to release the lock (B) and then remove each mounting rubbers (upper) (1). CAUTION: Never pull the tabs outside excessively to prevent it from damping.
9. Lift up and remove radiator from front of radiator core support. CAUTION: Be careful not to damage or scratch on radiator core.

INSTALLATION

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

Note. When installing radiator core support (upper), check that the upper and lower mounts of radiator and air condenser are securely inserted in each mounting hole of radiator core support (upper and lower).

1. Remove the following parts. Engine under cover Air duct (inlet): Refer to " «EXPLODED VIEW»(ref-672620-S30704453622014112400000) ". Oil level gauge: Refer to " «EXPLODED VIEW»(ref-672620-S02052188792014112400000) ". Battery and battery tray: Refer to " «REMOVAL AND INSTALLATION»(ref-672612-S30598946682014112400000) ".
2. Drain engine coolant from radiator. Refer to " «DRAINING»(ref-672622-S03082931862014112400000) ". CAUTION: Perform this step engine is cold. Never spill engine coolant on drive belt.
3. Remove radiator cap adapter and each radiator hoses (upper) and radiator pipe (upper) assembly. Refer to " «EXPLODED VIEW»(ref-672622-S30559909872014112400000) ".
4. Disconnect harness connector from crash zone sensor, and move harness to aside. Refer to " «EXPLODED VIEW»(ref-672639-S25440696782014112400000) ".
5. Disconnect harness connector from fan motors (RH and LH), and move harness to aside.
6. 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.

Note. Cooling fans are controlled by ECM. For details, refer to " COOLING FAN CONTROL: SYSTEM DESCRIPTION ".

Removal and Installation

Scheme 10

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Scheme 14

1. Remove the following parts. Cowl top extension. Engine under cover Front road wheel and tire Splash guard (RH): Refer to " «EXPLODED VIEW»(ref-672623-S22478781722014112400000) ".
2. Drain engine coolant from radiator. Refer to " «DRAINING»(ref-672622-S03082931862014112400000) " CAUTION: Perform this step when the engine is cold. Never spill engine coolant on drive belt.
3. Remove drive belt. Refer to " «REMOVAL AND INSTALLATION»(ref-672620-S17250281432014112400000) ".
4. Remove idler pulleys and harness bracket. Refer to " «REMOVAL AND INSTALLATION»(ref-672620-S17250281432014112400000) ".
5. Remove torque rod (upper). Refer to " «REMOVAL AND INSTALLATION»(ref-672620-S00497577782014112400000) ".
6. Remove water drain plug (front) on water pump side of cylinder block to drain engine coolant from engine inside.
7. Remove valve timing control cover (bank 1) and water pump cover from front timing chain case. Use the seal cutter [SST: KV10111100 (J-37228)] to cut liquid gasket for removal.
8. Remove timing chain tensioner (primary) (1) as follows: Remove lower mounting bolt (A). CAUTION: Be careful not to drop mounting bolt inside timing chain case. Loosen upper mounting bolt (B) slowly, and then turn chain tensioner (primary) on the mounting bolt so that plunger (C) is fully expanded. NOTE: Even if plunger is fully expanded, it is not dropped from the body of timing chain tensioner (primary). Remove timing chain tensioner (primary). Refer to " «REMOVAL AND INSTALLATION»(ref-672620-S32563752882014112400000) ". Turn crankshaft pulley clockwise so that timing chain on the timing chain tensioner (primary) side is loose.
9. Remove water pump as follows: NOTE: The use of the following item simplifies the procedure. Thin plastic sheet cut as shown in the figure below. Remove three water pump mounting bolts. Turn the crankshaft pulley counterclockwise to slack the water pump side timing chain for allowance. With the timing chain around water pump sprocket held with fingers, turn crank pulley counterclockwise to the position where the timing chain cannot be pulled in cylinder head direction. Insert sheet (A) between timing chain and water pump sprocket (1) of water pump housing. Screw bolts (B) of size M8 x 1.25 (threads length: approx. 50 mm) into the upper and lower bolt holes used for mounting water pump and tighten the bolts alternately by half turn all the way to pull out water pump (1). Pull out water pump straight to protect the mounting part from damage caused by vane. Do not allow sprocket to interfere with timing chain.
10. Remove M8 bolt and two O-rings from water pump.

Scheme 15

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Scheme 19

1. Install new O-rings to water pump. CAUTION: Do not reuse O-rings. Clean mounting grooves of O-ring to remove foreign matter. Install O-ring with a white identification mark to the engine front side (sprocket side) and O-ring with no identification mark to the engine rear side (vane side). CAUTION: Each O-ring is made of different material. Always install appropriate O-ring to the correct position.
2. Install water pump. Insert water pump by widening timing chain (1) with sheet (A) so as not to allow O-ring to interfere with timing chain and the corner of cylinder block. Apply engine oil around the O-ring with a white identification mark. Apply LLC around the O-ring with no identification mark. Insert water pump direct to cylinder block. Do not allow O-ring to be displaced. Press into water pump by tightening the mounting bolts alternately and evenly. Check timing chain and water pump sprocket for proper engagement.
3. Install timing chain tensioner (primary) as follows: Completely remove dust and foreign matter from the back of chain tensioner (primary) and the mounting surface on the rear timing chain case. Turn crank pulley (1) clockwise (direction shown by arrow) to loosen timing chain on the chain tensioner (primary) side. Lift self-locking pawl (A) to obtain allowance between the pawl and the ratchet of plunger (D). Press plunger into tensioner body. Fix self-locking pawl at the tip of ratchet and maintain plunger in its maximum compression. Insert stopper pin (E) into the tensioner body hole (B) to fix lever (C). Plunger becomes fixed at this step because of the interlock between the lever and self-locking pawl. NOTE: The figure shows a work example of using a precision screw driver of axis diameter ø1.2 mm as a stopper pin. Install chain tensioner (primary). Completely remove dust and foreign matter from the back of chain tensioner (primary) and the mounting surface before installing chain tensioner. After the installation, remove stopper pin (A) to release plunger. Check again that water pump sprocket and timing chain are engaged.
4. Install cam sprocket cover (Bank 1). Refer to " «REMOVAL AND INSTALLATION»(ref-672620-S32563752882014112400000) ".
5. Install water pump cover as per the following instructions: Remove old liquid gasket on the back of cover, the front timing chain case mounting surface, mounting bolt threads, and the bolt hole, by using a scraper. Clean the mounting surface with white gasoline. Apply liquid gasket evenly without any gap and overlap. Refer to " «LIQUID GASKET»(ref-672622-S27214278822014112400000) " Tighten mounting bolts.
6. Install water drain plug (front). Apply liquid gasket to the threads and tighten the screw.
7. Install the following items in the reverse order of removal. NOTE: When starting the engine or immediately after an engine start after the removal/installation procedure of chain tensioner (primary), slapping sound may be heard. This is not a malfunction. The slapping sound is generated due to decrease in oil pressure of the chain tensioner (primary) and eliminated as oil pressure increases.

Scheme 20

1. Check for badly rusted or corroded water pump body assembly.
2. Check for rough operation due to excessive end play.
3. If anything is found, replace water pump.

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

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

Scheme 21

1. Check valve seating condition at ordinary room temperatures. It should seat tightly.
2. Check valve operation. Thermostat (Standard): Refer to " «THERMOSTAT»(ref-672622-S23266592432014112400000) ". If the malfunctioning condition, when valve seating at ordinary room temperature, or measured values are out of the standard, replace water inlet and thermostat assembly.

1. Remove air duct (inlet), air cleaner cases (upper and lower) with mass air flow sensor and air duct assembly. Refer to " «EXPLODED VIEW»(ref-672620-S30704453622014112400000) ".
2. Remove engine cover. Refer to " «EXPLODED VIEW»(ref-672620-S40358377172014112400000) ".
3. Drain engine coolant from radiator drain plug at the bottom of radiator, and from water drain plug at the front of cylinder block. Refer to " «DRAINING»(ref-672622-S03082931862014112400000) " and " «ENGINE STAND SETTING»(ref-672620-S08475330862014112400000) ". CAUTION: Perform this step when the engine is cold. Never spill engine coolant on drive belt.
4. Remove battery and battery tray. Refer to " «REMOVAL AND INSTALLATION»(ref-672612-S30598946682014112400000) ".
5. Remove CVT fluid charging pipe and CVT fluid level gauge. Refer to " «EXPLODED VIEW»(ref-672620-S21429898042014112400000) ".
6. Remove oil level gauge. Refer to " «EXPLODED VIEW»(ref-672620-S21429898042014112400000) ".
7. Move CVT control cable aside. Refer to " «EXPLODED VIEW»(ref-672632-S20394282012014112400000) ".
8. Remove vacuum tube (front) mounting bolt from water outlet. Refer to " «EXPLODED VIEW»(ref-672622-S39090581092014112400000) ".
9. Remove radiator hose (upper) from water outlet.
10. Remove water hoses and heater hoses.
11. Remove harness bracket.
12. Disconnect harness connectors, and move harness to aside.
13. Remove engine coolant temperature sensor if necessary. CAUTION: Be careful not to damage engine coolant temperature sensor.
14. Remove reservoir tank. Refer to " «EXPLODED VIEW»(ref-672622-S30559909872014112400000) ".
15. Remove alternator bracket. Refer to " «EXPLODED VIEW»(ref-672637-S31460156662014112400000) ".
16. Remove water outlet, heater pipe, water bypass pipe and water connector.

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

1. Securely insert each hose, and install clamp at a position where it does not interfere with the pipe bulge.
2. When inserting water bypass pipe and heater pipe into water connector, apply neutral detergent to O-ring.