Engine Mechanical: Diagnosis Infiniti M45 II

PRECAUTIONS FOR INSPECTION, REPAIR AND REPLACEMENT

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

USE THE CHART BELOW TO HELP YOU FIND THE CAUSE OF THE SYMPTOM.

1. Locate the area where noise occurs.
2. Confirm the type of noise.
3. Specify the operating condition of engine.
4. Check specified noise source.

If necessary, repair or replace these parts.

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Inspection After Installation

1. After installing fuel tubes, make sure there is no fuel leakage at connections in the following steps. Apply fuel pressure to fuel lines with turning ignition switch ON (with engine stopped). Then check for fuel leaks at connections. Start the engine and rev it up and check for fuel leaks at connections.
2. Perform procedures for "Throttle Valve Closed Position Learning" after finishing repairs. Refer to «THROTTLE VALVE CLOSED POSITION LEARNING»(ref-173766-S28593026672005032200000) .
3. If electric throttle control actuator is replaced, perform procedures for "Idle Air Volume Learning" after finishing repairs. Refer to «IDLE AIR VOLUME LEARNING»(ref-173766-S01214225692005032200000) .

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1. Remove heated oxygen sensors as follows: Remove engine cover with power tool. Refer to «ENGINE ROOM COVER»(ref-159010-S24478988662005032300000) . Remove engine undercover with power tool. Remove harness connector of each heated oxygen sensor, and harness from bracket and middle clamp. Using the heated oxygen sensor wrench (SST), remove both left and right heated oxygen sensors. CAUTION: Be careful not to damage heated oxygen sensor. Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.
2. Remove exhaust manifold and three way catalyst (left bank) using the following steps. Remove A/C compressor with power tool and put it a side with piping connected. Refer to «REMOVAL»(ref-171295-S30718111712005020200000) . Remove exhaust front tube with power tool. Refer to «EXHAUST SYSTEM»(ref-180674-S09953288102005072800000) . Remove steering lower joint to enable steering shaft to move freely. Refer to «POWER STEERING GEAR AND LINKAGE»(ref-172964-S23841801082005030800000) . Support and lift up bottom of engine with transmission jack. Remove left engine mounting insulator along with left engine mounting brackets. Remove exhaust manifold cover (left bank). Loosen nuts in reverse order of illustration to remove exhaust manifold and three way catalyst (left bank) with power tool. NOTE: Exclude No. 9 to No. 12 in removal.
3. Remove exhaust manifold and three way catalyst (right bank) using the following steps. Remove battery and tray. Refer to «BATTERY»(ref-172770-S16764588022005030300000) . Remove radiator reservoir tank and bracket. Refer to «RADIATOR»(ref-172473-S36708261232005022800000) . Remove exhaust front tube with power tool. Refer to «EXHAUST SYSTEM»(ref-180674-S09953288102005072800000) . Remove nuts on bottom of right engine mounting insulator, and lift up right side of engine approximately 3 cm (1.18 in) with transmission jack. Remove starter motor with power tool. Refer to «REMOVAL AND INSTALLATION»(ref-172770-S07623634902005030300000) . Support and lift up bottom of engine with transmission jack. Remove right engine mounting insulator along with right engine mounting brackets. Remove exhaust manifold cover (right bank). Loosen nuts in reverse order of illustration to remove exhaust manifold and three way catalyst (right bank) with power tool. NOTE: Exclude No. 9 to No. 12 in removal.

Inspection After Removal

Clean oil strainer if any object attached.

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1. Install oil strainer.
2. Install oil pan as follows: Use scraper to remove old liquid gasket from mating surfaces. Also remove the old liquid gasket from mating surface of cylinder block. Remove old liquid gasket from the bolt holes and threads. CAUTION: Do not scratch or damage the mating surfaces when cleaning off old liquid gasket. Apply liquid gasket thoroughly as in illustration. Use Genuine RTV Silicone Sealant or equivalent. Refer to «RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS»(ref-180766-S18255399172005072900000) . Install new O-ring to oil pump and timing chain case side. Tighten bolts in numerical order as shown. No. 11 and 17 indicate double tightening of bolts 1 and 2. NOTE: Refer to the below for locating bolts. M6 x 30 mm (1.18 in): No. 18, 19 M8 x 100 mm (3.97 in): No. 5, 9 M8 x 45 mm (1.77 in): Except the above Tighten transmission joint bolts. Refer to «REMOVAL AND INSTALLATION»(ref-170821-S39496478632005011800000) . Install rear plate cover.
3. Install oil pan drain plug with new drain plug washer. Refer to illustration of components of former page for installation direction of washer. Refer to «REMOVAL AND INSTALLATION»(ref-159010-S02388737412005032300000) .
4. Install in the reverse order of removal. NOTE: Pour engine oil at least 30 minutes after oil pan is installed.

1. Check engine oil level and add engine oil. Refer to «ENGINE OIL»(ref-172635-S14574361462005030200000) .
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»(ref-172635-S14574361462005030200000) .

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1. Use standard type spark plug for normal condition. The hot type spark plug is suitable when fouling occurs with the standard type spark plug under conditions such as
2. Frequent engine starts
3. Low ambient temperatures

The cold type spark plug is suitable when spark knock occurs with the standard type spark plug under conditions such as

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1. Extended highway driving
2. Frequent high engine revolution Gap (Nominal): 1.1 mm (0.043 in) CAUTION: Do not drop or shock spark plug. Do not use a wire brush for cleaning. If plug tip is covered with carbon, spark plug cleaner may be used. Cleaner air pressure: Less than 588 kPa (5.9 bar, 6 kg/cm 2 , 85 psi) Cleaning time: Less than 20 seconds
3. Checking and adjusting plug gap is not required between change intervals.

Check for cracks and any excessive wear at link plates. Replace timing chain if necessary.

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Note. The above figure shows the relationship between the mating mark on each timing chain and that on the corresponding sprocket, with the components installed. Parts with an identification mark (R or L) should be installed on the corresponding bank according to the mark.

Parts with an identification mark

1. Camshaft sprocket (INT)
2. Dowel pin groove of camshaft sprocket (EXH) (camshaft sprocket is same part both banks)
3. Chain tension guide
4. Chain slack guide
5. To install timing chain and associated parts, start with those on right bank. The procedure for installing parts on left bank is omitted because it is the same as that for installation on right bank.

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1. Check that the crankshaft key and dowel pin of each camshaft are facing in the direction indicated. (No. 1 cylinder at compression TDC) NOTE: Though camshaft does not stop at the position as shown in the figure, for the placement of cam nose, it is generally accepted camshaft is placed for the same direction of the figure.
2. Install camshaft sprockets. Install onto correct side by checking with identification mark on surface. Install camshaft sprocket (EXH) by selectively using the groove of dowel pin according to the bank. (Common part used for both banks.) Lock the hexagonal part of camshaft in the same way as for removal, and tighten fixing bolts.
3. Install crankshaft sprockets for both banks. Install each crankshaft sprocket so that its flange side (the larger diameter side without teeth) faces in the direction shown in figure. NOTE: The same parts are used but facing directions are different.
4. Install timing chains and associated parts. Align the mating mark on each sprocket and the timing chain for installation. CAUTION: For the above reason, after the mating marks are aligned, keep them aligned by holding them with a hand. Before installing chain tensioner, it is possible to change the position of mating mark on timing chain for that on each sprocket for alignment. Install chain slack guides and chain tension guides onto correct side by checking with identification mark on surface. Install chain tensioner with plunger fixed as described in its removal. CAUTION: Before and after the installation of chain tensioner, make sure that the mating mark on timing chain is not out of alignment. After installing chain tensioner, remove stopper pin to release tensioner. Check that tensioner is released. To avoid chain-link skipping of timing chain, never move crankshaft or camshafts until front cover is installed.
5. In the same way as for right bank, install timing chain and associated parts on left side.
6. Install oil pump assembly.
7. Install oil pump drive spacer as follows: Insert oil pump drive spacer according to the directions of crankshaft key and the two flat surfaces of oil pump inner rotor. If the positional relationship does not allow the insertion, rotate oil pump inner rotor with a finger to allow the spacer. After confirming that the position of each part is in correct condition to allow for the spacer, force fit the spacer by lightly tapping with a plastic hammer until it contacts and does not go further.
8. Install front oil seal onto front cover. Install new oil seal in the direction shown in the figure. CAUTION: Be careful not to scratch or make burrs on circumference of oil seal. Using the front oil seal drift (commercial service tool) or drift with 54 mm (2.13 in) diameter, force fit front oil seal until it levels with the front end surface of front cover.
9. Install chain tensioner cover onto front cover. Apply liquid gasket as shown in the figure. Use Genuine RTV Silicone Sealant or equivalent. Refer to «RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS»(ref-180766-S18255399172005072900000) .
10. Install front cover as follows: Install new O-rings onto right and left cylinder heads and cylinder block. Apply liquid gasket as shown in the figure. Use Genuine RTV Silicone Sealant or equivalent. Refer to «RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS»(ref-180766-S18255399172005072900000) . Check again that the timing mating mark on timing chain and that on each sprocket are aligned. Then, install front cover. CAUTION: Be careful to avoid interference with the front end of oil pump drive spacer. Such interference may damage front oil seal. Tighten fixing bolts in the numerical order shown in the figure. There are four types of mounting bolts. After tightening, re-tighten to the specified torque. CAUTION: Be sure to wipe off any excessive liquid gasket leaking onto surface mating with oil pan.
11. Install intake valve timing control cover as follows: At the back of intake valve timing control cover, install new seal rings (three for each bank) to the area to be inserted into camshaft sprocket (INT). CAUTION: Do not spread seal ring excessively to avoid breaks and deformation. On the side of front cover, install new O-ring (one for each bank). Apply liquid gasket as shown in the figure. Use Genuine RTV Silicone Sealant or equivalent. Refer to «RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS»(ref-180766-S18255399172005072900000) . Tighten fixing bolts in the numerical order shown in the figure.
12. Install intake valve timing control position sensor, intake valve timing control solenoid valve and camshaft position sensor (PHASE) to intake valve timing control cover and front cover. Be sure to tighten bolts with flanges completely seated.
13. Install crankshaft pulley as follows: Fix crankshaft with ring gear stopper (SST: J-45476). Install crankshaft pulley, taking care not to damage front oil seal. Install according to dowel pin of oil pump drive spacer. Lightly tapping its center with plastic hammer, insert pulley. CAUTION: Do not tap pulley on the side surface where belt is installed (outer circumference). Apply engine oil onto threaded parts of bolts and seating areas. Tighten crankshaft pulley bolt. : 93.1 N.m (9.5 kg-m, 69 ft-lb) Select one most visible notch of the four on bolt flange. Corresponding to the selected notch, put a mating mark (such as paint) on crankshaft pulley. Tighten further by 90 degrees. (Angle tightening) Check the tightening angle by referencing to the notches. The angle between two notches is 90 degrees.
14. Rotate crankshaft pulley in normal direction (clockwise when viewed from engine front) to check for interference among parts.
15. Install in the reverse order of removal. NOTE: If hydraulic pressure inside timing chain tensioner drops after removal/installation, slack in guide may generate a pounding noise during and just after engine start. However, this does not indicate an unusual condition. Noise will stop after hydraulic pressure rises.

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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1. Remove timing chain. Refer to «REMOVAL AND INSTALLATION»(ref-159010-S39200003652005032300000) .
2. With hexagonal part of camshaft locked with wrench, loosen bolts securing camshaft sprocket to remove camshaft sprocket. CAUTION: To avoid interference between valves and pistons, do not turn crankshaft or camshaft with timing chain disconnected.
3. Loosen fixing bolts in reverse order of that shown in the figure to remove camshaft brackets. 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.
4. Remove camshaft.
5. Remove adjusting shims and valve lifters if necessary. Correctly identify location where each part is installed. Keep parts in an organized way to avoid mixing them up.

Inspection

Perform inspection as follows after removal, installation or replacement of camshaft or valve-related parts, or if there is unusual engine conditions due to changes in valve clearance (engine starting, idling, and/or noise).

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1. Warm up engine. Then stop it.
2. Remove engine cover with power tool and air duct (inlet). Refer to «REMOVAL AND INSTALLATION»(ref-159010-S38119701512005032300000) .
3. Remove rocker covers (right and left bank) with power tool. Refer to «REMOVAL AND INSTALLATION»(ref-159010-S40213109212005032300000) .
4. Turn crankshaft pulley in normal direction (clockwise when viewed from engine front) to align TDC identification notch (without paint mark) with timing indicator.
5. At this time, check that the both intake and exhaust cam noses of No. 1 cylinder (top front on left bank) face outside. If they do not face outside, turn crankshaft pulley by 360 degrees once more.
6. 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) with feeler gauge. NOTE: Firing order 1-8-7-3-6-5-4-2 No. 1 cylinder compression TDC Use 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 * Intake: 0.26 - 0.34 mm (0.010 - 0.013 in) Exhaust: 0.29 - 0.37 mm (0.011 - 0.015 in) * Reference data at approximately 20° C (68° F) CAUTION: If inspection was carried out with cold engine, check that values with fully warmed up engine are still within specifications.
7. Turn crankshaft pulley clockwise by 270 degrees from the position of No. 1 cylinder compression TDC to obtain No. 3 cylinder compression TDC.
8. 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
9. Turn crankshaft pulley clockwise by 90 degrees from the position of No. 3 cylinder compression TDC (clockwise by 360 degrees from the position of No. 1 cylinder compression TDC) to align No. 6 cylinder at TDC of its compression stroke.
10. By referring to the figure, measure valve clearances at locations marked "X" as shown in the table below. No. 6 cylinder compression TDC
11. For measured value are out of the standard, perform adjustment. Refer to «ADJUSTMENT»(ref-159010-S31388605312005032300000) .

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.
7. Summary of the inspection items

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