Engine Cooling System: Removal & Installation Nissan Pathfinder III

INSTALLATION

Installation is in the reverse order of removal.

REMOVAL

1. Remove air duct. Refer to " «REMOVAL AND INSTALLATION»(ref-272536-S36331754392007112100000) ".
2. Remove the engine front undercover.
3. Remove the upper and lower radiator shrouds. Refer to " «REMOVAL AND INSTALLATION»(ref-272537-S33268225802007112100000) ".
4. Remove drive belts. Refer to " «REMOVAL AND INSTALLATION»(ref-272536-S38793331262007112100000) ".
5. Remove cooling fan.

Installation is in the reverse order of removal.

1. Install cooling fan with its front mark "F" facing front of engine. Refer to " «REMOVAL AND INSTALLATION (CRANKSHAFT DRIVEN TYPE)»(ref-272537-S23126790332007112100000) ".

Installation is in the reverse order of removal.

1. Cooling fan is controlled by ECM. For details, refer to " «COOLING FAN OPERATION»(ref-272533-S22107609442007112100000) ".

Identifying Water Pump Components With Torque Specifications. Scheme 13

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Scheme 19

1. Remove undercover with power tool.
2. Remove drive belts. Refer to " «REMOVAL AND INSTALLATION»(ref-272536-S38793331262007112100000) ".
3. Drain engine coolant. Refer to " «ENGINE COOLANT»(ref-272537-S37144720002007112100000) ". CAUTION: Perform this step when engine is cold. Do not spill engine coolant on drive belts.
4. Remove radiator hoses (upper and lower) and cooling fan assembly. Refer to " «ENGINE COOLING FAN»(ref-272537-S26451072492007112100000) ".
5. Remove chain tensioner cover and water pump cover from front timing chain case, using Tool. Tool number: KV10111100 (J-37228) see scheme 25: Identifying Chain Tensioner Cover And Water Pump Cover
6. Remove timing chain tensioner (primary) as follows: Loosen clip of timing chain tensioner (primary), and release plunger stopper. (1) Insert plunger into tensioner body by pressing slack guide. (2) Keep slack guide pressed and hold plunger in by pushing stopper pin through the tensioner body hole and plunger groove. (3) see scheme 26: Identifying Timing Chain Tensioner Turn crankshaft pulley clockwise so that timing chain on the timing chain tensioner (primary) side is loose. see scheme 27: Turning Crankshaft Pulley Clockwise Remove bolts and remove timing chain tensioner (primary). CAUTION: Be careful not to drop bolts inside timing chain case. see scheme 28: Identifying Bolts And Timing Chain Tensioner (Primary)
7. Remove water pump as follows: Remove three water pump bolts. Secure a gap between water pump gear and timing chain, by turning crankshaft pulley counterclockwise until timing chain looseness on water pump sprocket becomes maximum. (Scheme 14): Identifying Water Pump Screw M8 bolts [pitch: 1.25 mm (0.049 in) length: approx. 50 mm (1.97 in)] into water pumps upper and lower bolt holes until they reach timing chain case. Then, alternately tighten each bolt for a half turn, and pull out water pump. CAUTION: Pull straight out while preventing vane from contacting socket in installation area. Remove water pump without causing sprocket to contact timing chain. Remove M8 bolts and O-rings from water pump. CAUTION: Do not disassemble water pump. NOTE: Do not reuse O-rings. (Scheme 15): Identifying M8 Bolts

Scheme 20

1. Check for badly rusted or corroded water pump body assembly.
2. Check for rough operation due to excessive end play.
3. Replace water pump, if necessary. (Scheme 16): Checking End Play

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1. Install new O-rings to water pump. NOTE: Apply engine oil to O-rings. Locate O-ring with white paint mark to engine front side. (Scheme 17): Identifying O-Rings To Water Pump
2. Install water pump. CAUTION: Do not allow timing chain case to nip O-rings when install water pump. Make sure that timing chain and water pump sprocket are engaged. Insert water pump by tightening bolts alternately and evenly. (Scheme 18): Identifying Water Pump
3. Install timing chain tensioner (primary) as follows: Remove dust and foreign material completely from backside of timing chain tensioner (primary) and from installation area of rear timing chain case. Turn crankshaft pulley clockwise so that timing chain on the timing chain tensioner (primary) side is loose. Install timing chain tensioner (primary) with its stopper pin attached. CAUTION: Be careful not to drop bolts inside timing chain case. Remove stopper pin. (Scheme 19): Identifying Timing Chain Tensioner (Primary) With Stopper Pin Make sure again that timing chain and water pump sprocket are engaged.
4. Install chain tensioner cover and water pump cover as follows: Before installing, remove all traces of old liquid gasket from mating surface of water pump cover and chain tensioner cover using scraper. Also remove traces of old liquid gasket from the mating surface of front timing chain case. (Scheme 20): Identifying Chain Tensioner Cover And Water Pump Cover Apply a continuous bead of liquid gasket, to mating surface of chain tensioner and water pump cover, using Tool. Tool number: WS39930000 ( - ) Use Genuine RTV Silicone Sealant or equivalent. Refer to " «RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS»(ref-272531-S39642641642007112100000) ". CAUTION: Attaching should be done within 5 minutes after coating. Tighten bolts to specified torque. Refer to " «REMOVAL AND INSTALLATION»(ref-272537-S03814309652007112100000) ". (Scheme 21): Applying Continuous Bead Of Liquid Gasket
5. Refill engine coolant system. Refer to " «REFILLING ENGINE COOLANT»(ref-272537-S17627096762007112100000) ". Apply liquid gasket to the thread of water drain plug (front). Use Genuine RTV Silicone Sealant or equivalent. Refer to " «RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS»(ref-272531-S39642641642007112100000) ".
6. Installation of the remaining components is in the reverse order of removal after this step. After starting engine, let idle for three minutes, then rev engine up to 3,000 rpm under no load to purge air from the high-pressure chamber of chain tensioner. Engine may produce a rattling noise. This indicates that air still remains in the chamber and is not a matter of concern.

Installation is in the reverse order of removal, paying attention to the following.

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

1. Completely drain engine coolant. Refer to " «DRAINING ENGINE COOLANT»(ref-272537-S20500383622007112100000) ". CAUTION: Perform this step when engine is cold. Do not spill engine coolant on drive belts.
2. Remove A/T fluid charging pipe Refer to " «TRANSMISSION ASSEMBLY»(ref-272543-S14939942792007112100000) ".
3. Remove the rocker cover (right bank). Refer to " «REMOVAL AND INSTALLATION»(ref-272536-S13313581702007112100000) ".
4. Remove engine coolant temperature sensor as necessary. CAUTION: Be careful not to damage engine coolant temperature sensor.
5. Remove water outlet, heater pipe, water bypass hoses and water pipe.

Installation is in the reverse order of removal, paying attention to the following.

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