Engine Cooling System: Overhaul Infiniti FX35 I

Disassembly

1. Remove fans from fan motors.
2. Remove fan motors from fan shroud.

Assembly

Install in the reverse order of disassembly.

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1. Remove front engine undercover with power tool.
2. Remove drive belts. Refer to «DRIVE BELTS»(ref-158850-S01616040242005020300000) .
3. Drain engine coolant from radiator. Refer to «CHANGING ENGINE COOLANT»(ref-172368-S19622047562005022400000) . CAUTION: Perform when engine is cold.
4. Remove air duct (inlet), power duct and air cleaner case assembly. Refer to «AIR CLEANER AND AIR DUCT»(ref-158850-S12244247462005020300000) .
5. Remove water drain plug (front) of cylinder block.
6. Remove chain tensioner cover and water pump cover separating the mating surface with a seal cutter [SST: KV10111100(J37228)]. CAUTION: Be careful not to damage the mating surfaces.
7. Remove timing chain tensioner (primary) with the following procedure. Pull the lever down and release plunger stopper tab. Plunger stopper tab can be pushed up to release (coaxial structure with lever). Insert stopper pin into the tensioner body hole to hold lever and keep the plunger stopper tab released. NOTE: An Allen wrench [2.5 mm (0.098 in)] is used for a stopper pin as an example. Insert plunger into the tensioner body by pressing timing chain slack guide. Keep slack guide pressed and hold plunger in by pushing stopper pin deeper through lever and into the tensioner body hole. Turn crankshaft pulley approximately 20 clockwise so that timing chain on the timing chain tensioner (primary) side is loose. Remove mounting bolts and timing chain tensioner (primary). CAUTION: Be careful not to drop mounting bolts inside chain case.
8. Remove three water pump fixing 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.
9. Screw M8 bolts [pitch: 1.25 mm (0.049 in) length: approx. 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. CAUTION: Pull straight out while preventing vane from contacting socket in installation area. Remove water pump without causing sprocket to contact timing chain.
10. Remove M8 bolts and O-rings from water pump. CAUTION: Do not disassemble water pump.

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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.

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1. Install new O-rings to water pump. Apply engine oil and engine coolant to O-rings as shown. Locate O-ring with white paint mark to engine front side.
2. Install water pump. CAUTION: Do not allow cylinder block to nip O-rings when installing water pump. Make sure 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 the following: Remove dust and foreign material completely from backside of chain tensioner 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. Apply engine oil should be applied to the oil hole and tensioner, when installing timing chain tensioner. Install timing chain tensioner (primary). Remove stopper pin.
4. Install chain tensioner cover and water pump cover. Before installing, remove all traces of liquid gasket from mating surface of water pump cover and chain tensioner cover using a scraper. Also remove traces of liquid gasket from the mating surface of front timing chain case. Apply a continuous bead of liquid gasket to mating surface of chain tensioner cover and water pump cover with tube presser [SST: WS39930000 ( - )]. Use Genuine RTV Silicone Sealant or equivalent. RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS .
5. Install water drain plug (front) of cylinder block. 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 .
6. 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.