Engine Cooling System: Removal & Installation Infiniti EX35 I

REMOVAL

Scheme 9

Scheme 10

Scheme 11

Scheme 12

1. Remove the following parts: Engine under cover with power tool. Engine cover: Refer to " «Exploded View»(ref-368797-S08623518782010081300000) ". Air cleaner case (RH and LH): Refer to " «Exploded View»(ref-368797-S19785767342010081300000) ". Reservoir tank: Refer to " «EXPLODED VIEW»(ref-368795-S35101085722010081300000) ". Hood lock cover, hood lock stay assembly and horn: Refer to " «Exploded View»(ref-368800-S10815232042010081300000) ".
2. Remove condenser. Refer to " «Exploded View»(ref-368782-S02837808102010081300000) ".
3. Drain engine coolant from radiator. Refer to " «DRAINING»(ref-368795-S05263292432010081300000) ". CAUTION: Perform this step when the engine is cold. Never spill engine coolant on drive belt.
4. Disconnect A/T fluid cooler hoses from radiator. Install blind plug to avoid leakage of A/T fluid.
5. Remove radiator hoses (upper and lower) and reservoir tank hose. CAUTION: Be careful not to allow engine coolant to contact drive belt. Never loosen radiator water inlet pipe mounting screw (A). If loosened, replace radiator (1).
6. Remove cooling fan assembly. Refer to " «EXPLODED VIEW»(ref-368795-S34258236372010081300000) ". CAUTION: Never damage or scratch radiator core when removing.
7. Rotate two radiator upper mount brackets 90 degrees in direction as shown in the figure, and remove them.
8. Remove radiator as follows: CAUTION: Be careful not to damage radiator core. Lift up and pull the radiator (1) forward, and then remove the mounting rubber (lower) (3) from the radiator core support (2). Remove radiator (1) from front of radiator core support (2).

INSTALLATION

Installation is the reverse order of removal.

1. Remove engine under cover with power tool.
2. Drain engine coolant. Refer to " «DRAINING»(ref-368795-S05263292432010081300000) ".
3. Remove reservoir tank. Refer to " «EXPLODED VIEW»(ref-368795-S35101085722010081300000) ".
4. Remove air cleaner case (LH and RH). Refer to " «Exploded View»(ref-368797-S19785767342010081300000) ".
5. Remove mounting bolt from high pressure flexible hose bracket. Refer to " «Exploded View»(ref-368782-S15125114082010081300000) ".
6. Remove radiator hose (upper). Refer to " «EXPLODED VIEW»(ref-368795-S35101085722010081300000) ".
7. Disconnect harness connector from cooling fan control module, and move harness to aside.
8. 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.

Removal and Installation

Scheme 13

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1. Remove engine cover. Refer to " «Exploded View»(ref-368797-S08623518782010081300000) ".
2. Release the fuel pressure. Refer to " «Inspection»(ref-368796-S03735697402010081300000) ".
3. Disconnect the battery cable from the negative terminal.
4. Remove air duct and air cleaner case assembly (RH and LH). Refer to " «Exploded View»(ref-368797-S19785767342010081300000) ".
5. Remove reservoir tank. Refer to " «EXPLODED VIEW»(ref-368795-S35101085722010081300000) ".
6. Separate engine harness removing their brackets from front timing chain case.
7. Remove engine undercover with power tool.
8. Drain engine oil. Refer to " «Draining»(ref-368815-S00680489972010081300000) ". CAUTION: Perform this step when the engine is cold. Never spill engine oil on drive belt.
9. Drain engine coolant from radiator. Refer to " «DRAINING»(ref-368795-S05263292432010081300000) ". CAUTION: Perform this step when the engine is cold. Never spill engine coolant on drive belt.
10. Remove radiator hose (lower). Refer to " «EXPLODED VIEW»(ref-368795-S35101085722010081300000) ".
11. Remove cooling fan assembly. Refer to " «EXPLODED VIEW»(ref-368795-S34258236372010081300000) ".
12. Remove front timing chain case. Refer to " «Exploded View»(ref-368797-S18777869772010081300000) ".
13. Remove timing chain tensioner (primary) as follows: Remove lower mounting bolt (A). Loosen upper mounting bolt (B) slowly, and then turn chain tensioner (primary) (1) on the upper 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 upper mounting bolt, and then remove timing chain tensioner (primary).
14. Remove water pump as follows: Remove three water pump mounting bolts. Secure a gap between water pump gear and timing chain, by turning crankshaft counterclockwise until timing chain looseness on water pump sprocket becomes maximum. Screw M8 bolts (A) [pitch: 1.25 mm (0.0492 in) length: approximately 50 mm (1.97 in)] into water pumps upper and lower mounting bolt holes until they reach timing chain case. Then, alternately tighten each bolt for a half turn, and pull out water pump (1). 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: Never disassemble water pump.

Scheme 15

Scheme 16

1. Install new O-rings to water pump. Apply engine oil to O-ring (1) and engine coolant to O-ring (3) as shown in the figure. Locate O-ring with yellow paint mark (A) to front side. Locate O-ring with light blue paint mark (B) to rear side.
2. Install water pump. CAUTION: Never allow cylinder block to nip O-rings when installing water pump. Check timing chain and water pump sprocket are engaged. Insert water pump by tightening mounting bolts alternately and evenly.
3. Install timing chain tensioner (primary) as follows: Turn crankshaft clockwise so that timing chain on the timing chain tensioner (primary) side is loose. Pull plunger stopper tab (A) up (or turn lever downward) so as to remove plunger stopper tab from the ratchet of plunger (D). NOTE: Plunger stopper tab and lever (C) are synchronized. Push plunger into the inside of tensioner body. Hold plunger in the fully compressed position by engaging plunger stopper tab with the tip of ratchet. To secure lever, insert stopper pin (E) through hole of lever into tensioner body hole (B). The lever parts and the tab are synchronized. Therefore, the plunger will be secured under this condition. NOTE: Figure shows the example of 1.2 mm (0.047 in) diameter thin screwdriver being used as the stopper pin. Install timing chain tensioner (primary). Remove dust and foreign material completely from backside of timing chain tensioner (primary) and from installation area of rear timing chain case. Remove stopper pin. Check again that timing chain and water pump sprocket are engaged.
4. Install in the reverse order of removal for remaining parts. 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.

Scheme 17

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 18

1. Check valve seating condition at ordinary room temperatures. It should seat tightly.
2. Check valve operation. Thermostat (Standard) : Refer to " «THERMOSTAT»(ref-368795-S19514782782010081300000) ". 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 engine undercover with power tool.
2. Drain engine coolant. Refer to " «DRAINING»(ref-368795-S05263292432010081300000) ". CAUTION: Perform this step when the engine is cold. Never spill engine coolant on drive belt.
3. Remove engine cover. Refer to " «Exploded View»(ref-368797-S08623518782010081300000) ".
4. Remove air duct and air cleaner case assembly (RH and LH). Refer to " «Exploded View»(ref-368797-S19785767342010081300000) ".
5. Remove intake manifold collector. Refer to " «Exploded View»(ref-368797-S15585949212010081300000) ".
6. Remove intake manifold. Refer to " «Exploded View»(ref-368797-S39805602922010081300000) ".
7. Remove reservoir tank. Refer to " «EXPLODED VIEW»(ref-368795-S35101085722010081300000) ".
8. Remove oil level gauge and guide. Refer to " «Exploded View (2WD)»(ref-368797-S38575075692010081300000) " or " «Exploded View (AWD)»(ref-368797-S35437469302010081300000) ".
9. Remove radiator hose (upper) and heater hose.
10. Remove water outlet (front) and water outlet pipe.
11. Separate engine harness removing their bracket from water outlet (rear).
12. Remove engine coolant temperature sensor if necessary. CAUTION: Be careful not to damage engine coolant temperature sensor.
13. Remove heater pipe, water bypass pipe, and water outlet (rear).

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 outlet pipe and water bypass pipe into water outlet, apply neutral detergent to O-ring.