Engine Mechanical: Diagnosis Infiniti FX45 I

PRECAUTIONS FOR INSPECTION, REPAIR AND REPLACEMENT

Before repairing or replacing, thoroughly inspect parts. Inspect new replacement parts in the same way, and replace if necessary.

Inspection After Installation

1. Perform the "Throttle Valve Closed Position Learning" when harness connector of electric throttle control actuator is disconnected. Refer to «THROTTLE VALVE CLOSED POSITION LEARNING»(ref-159528-S41354254532003121500000) .
2. Perform the "Idle Air Volume Learning" and "Throttle Valve Closed Position Learning" when electric throttle control actuator is replaced. Refer to «IDLE AIR VOLUME LEARNING»(ref-159528-S04618917772003121500000) .

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Inspection After Removal

Clean oil strainer if any object attached.

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1. Install oil strainer.
2. Install axle pipe to oil pan, if removed. Lubricate O-ring groove of axle pipe, O-ring, and O-ring joint of oil pan with new engine oil. Right/left O-ring diameters differ from each other. O-ring with identification paint mark is installed on front drive shaft (left) installing side. Install axle pipe to oil pan from (left) side. CAUTION: Insert it with care to prevent O-ring from sliding.
3. Install oil pan as follows: Install new O-rings to oil pump and front cover side. Apply a continuous bead of liquid gasket with tube presser [SST: WS39930000 ( - )] to the cylinder block mating surface of oil pan to a limited portion as shown in the figure. Use Genuine RTV Silicone Sealant or equivalent. Refer to RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS . CAUTION: Attaching should be done within 5 minutes after coating.
4. Install oil pan. Tighten bolts in numerical order as shown in the figure. NOTE: Tighten bolts No. 1 and No. 2 in two steps. The numerical order No. 11 and No. 17 shown second steps. There are three types of mounting bolts. Refer to the following for locating bolts. M6 x 30 mm (1.18 in): 18, 19 M8 x 100 mm (3.94 in): 5, 9 M8 x 45 mm (1.77 in): Except the above
5. Tighten transmission joint bolts. Refer to «REMOVAL AND INSTALLATION (AWD MODELS)»(ref-171001-S14766714062005012500000) .
6. Install rear plate cover.
7. Install oil pan drain plug with new drain plug washer. Refer to the figure of components of former page for installation direction of drain plug washer. Refer to «REMOVAL AND INSTALLATION»(ref-158963-S02987407412005020300000) .
8. Install in the reverse order of removal after this step. NOTE: At least 30 minutes after oil pan is installed, pour engine oil.

1. Refer to the figure of components of former page for installation direction of drain plug washer. Refer to «REMOVAL AND INSTALLATION»(ref-158963-S02987407412005020300000) .

1. Check engine oil level and add engine oil. Refer to ENGINE OIL .
2. Start engine, and check there is no leak of engine oil.
3. Stop engine and wait for 15 minutes.
4. Check engine oil level again. Refer to ENGINE OIL .

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1. Remove engine cover with power tool. Refer to «ENGINE ROOM COVER»(ref-158963-S06074735262005020300000) .
2. Remove air duct (inlet), air cleaner case and mass air flow sensor assembly, air duct and resonator assembly. Refer to «AIR CLEANER AND AIR DUCT»(ref-158963-S32645370962005020300000) .
3. Disconnect harness connector from ignition coil.
4. Remove ignition coil. CAUTION: Do not shock it.

Use standard type spark plug for normal condition.

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1. Gap (Nominal): 1.1 mm (0.043 in)

Hot type spark plug is suitable when fouling occurs with standard type spark plug under conditions such as

1. Frequent engine starts
2. Low ambient temperatures

Cold type spark plug is suitable when spark plug knock occurs with standard type spark plug under conditions such as

1. Extended highway driving
2. Frequent high engine revolution

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1. Before starting engine, check the levels of engine coolant, lubrications and working fluid. If less than required quantity, fill to the specified level.
2. Run engine to check for unusual noise and vibration.
3. Warm up engine thoroughly to make sure there is no leakage of engine coolant, engine oil and working fluid, fuel and exhaust gas.
4. Bleed air from passages in pipes and tubes of applicable lines, such as in cooling system.
5. After cooling down engine, again check amounts of engine coolant, engine oil and working fluid. Refill to specified level, if necessary.

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1. Remove engine assembly from vehicle. Refer to «ENGINE ASSEMBLY»(ref-158963-S21545795282005020300000) .
2. Remove timing chain. Refer to «TIMING CHAIN»(ref-158963-S26827489122005020300000) .
3. With hexagonal part of camshaft locked with wrench, loosen bolts securing camshaft sprocket to remove camshaft sprocket. CAUTION: After removing timing chain, do not turn crankshaft and camshaft separately, or valves will strike the piston head.
4. Remove intake and exhaust camshaft brackets. Mark camshafts, camshaft brackets and bolts. Place in the same position and direction for installation. Equally loosen camshaft brackets and bolts in several steps in reverse order as shown in the figure. Lightly tapping with plastic hammer, remove camshaft bracket (No. 1) and camshaft bracket (No. 6). NOTE: The bottom surface of each bracket will be stuck to cylinder head because of liquid gasket.
5. Remove camshaft.
6. Remove adjusting shim and valve lifter if necessary. Identify installation positions, and store them without mixing them up.

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1. Put V-block on precise flat table, and support No. 2 and No. 5 journal of camshaft. CAUTION: Do not support journal No. 1 (on the side of camshaft sprocket) because it has a different diameter from the other three locations.
2. Set dial indicator vertically to No. 3 journal.
3. Turn camshaft to one direction with hands, and measure camshaft runout on dial indicator. (Total indicator reading) Limit : 0.02 mm (0.0008 in)
4. If it exceeds the limit, replace camshaft.

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1. Measure camshaft cam height with micrometer. Standard cam height Intake : 44.865 - 45.055 mm (1.7663 - 1.7738 in) Exhaust : 43.925 - 44.115 mm (1.7293 - 1.7368 in) Cam wear limit: 0.2 mm (0.008 in)
2. If wear is beyond the limit, replace camshaft.

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1. Measure outer diameter of camshaft journal with micrometer. Standard: No. 1 : 25.938 - 25.955 mm (1.0212 - 1.0218 in) No. 2, 3, 4 : 25.953 - 25.970 mm (1.0218 - 1.0224 in)

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1. Tighten camshaft bracket bolt with specified torque. Refer to «INSTALLATION»(ref-158963-S13612294542005020300000) for the tightening procedure.
2. Measure inner diameter "A" of camshaft bracket with bore gauge. Standard : 26.000 - 26.021 mm (1.0236 - 1.0244 in)

Inspection

In cases of removing/installing or replacing camshaft and valve-related parts, or of unusual engine conditions due to changes in valve clearance (found malfunctions during starting, idling or causing noise), perform inspection as follows

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1. Warm up engine. Then stop it.
2. Remove rocker covers (right and left bank). Refer to «ROCKER COVER»(ref-158963-S03766277342005020300000) .
3. Measure valve clearance as follows: Set No. 1 cylinder at TDC of its compression stroke. Rotate crankshaft pulley clockwise to align TDC identification notch (without paint mark) with timing indicator on front cover. Make sure that both intake and exhaust cam noses of No. 1 cylinder (engine front side of left bank) are located as shown in the figure. If not, turn crankshaft one revolution (360 degrees) and align as shown in the figure. Measure valve clearance with feeler gauge. Valve clearance standard: Hot Intake : 0.304 - 0.416 mm (0.012 - 0.016 in) Exhaust : 0.308 - 0.432 mm (0.012 - 0.017 in) Cold (Approximately 20°C (68°F)) Intake : 0.26 - 0.34 mm (0.010 - 0.013 in) Exhaust : 0.29 - 0.37 mm (0.011 - 0.015 in) CAUTION: If inspection was carried out with cold engine, make sure values with fully warmed up engine are still within specifications. By referring to the figure, measure valve clearances at locations marked "X" as shown in the table below (locations indicated with black arrow in figure). NOTE: Firing order is 1-8-7-3-6-5-4-2 No. 1 cylinder compression TDC Rotate crankshaft pulley clockwise (when view from engine front) by 270 degrees from the position of No. 1 cylinder compression TDC to align No. 3 cylinder at TDC of its compression stroke. NOTE: Crankshaft pulley mounting bolt flange has a angle mark every 90 degrees. They can be used as a guide to rotation angle. By referring to the figure, measure valve clearances at locations marked "X" as shown in the table below (locations indicated with white arrow in figure) No. 3 cylinder compression TDC Rotate crankshaft pulley clockwise (when view from engine front) by 90 degrees from the position of No. 3 cylinder compression TDC to align No. 6 cylinder at TDC of its compression stroke. By referring to the figure, measure valve clearances at locations marked "X" as shown in the table below. No. 6 cylinder compression TDC
4. For measured value are out of the standard, perform adjustment. Refer to «ADJUSTMENT»(ref-158963-S39009489342005020300000) .

1. Before starting engine, check the levels of engine coolant, engine oil and working fluid. If less than required quantity, fill to the specified level.
2. Use procedure below to check for fuel leakage. Turn ignition switch "ON" (with engine stopped). With fuel pressure applied to fuel piping, check for fuel leakage at connection points. Start engine. With engine speed increased, check again for fuel leakage at connection points.
3. Run engine to check for unusual noise and vibration.
4. Warm up engine thoroughly to make sure there is no leakage of engine coolant, engine oil, working fluid, fuel and exhaust gas.
5. Bleed air from passages in pipes and tubes of applicable lines, such as in cooling system.
6. After cooling down engine, again check amounts of engine coolant, engine oil and working fluid. Refill to specified level, if necessary.

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