Engine Mechanical: Diagnosis Nissan Armada 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.

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.

Scheme 12

Scheme 13

1. Remove the engine cover bolts and cover. CAUTION: Do not damage or scratch cover when installing or removing.

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 by 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 the connections.
2. Perform procedures for "Throttle Valve Closed Position Learning" after finishing repairs. Refer to «THROTTLE VALVE CLOSED POSITION LEARNING»(ref-233258-S15347962382006052500000) .
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-233258-S23582668532006052500000) .

Scheme 14

INSPECTION AFTER REMOVAL

Clean the oil strainer.

Scheme 15

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Scheme 19

1. Install the oil pan (upper) using the following steps. Apply liquid gasket thoroughly (Scheme 15) Use Genuine RTV Silicone Sealant or equivalent. Refer to «RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS»(ref-233237-S23907478682006052500000). CAUTION: Apply liquid gasket to outside of bolt hole for the hole shown by *. Install new O-rings to the oil pump and front cover side. Tighten the bolts in numerical order (Scheme 17) M6 x 30 mm (1.18 in): No. 15, 16 M8 x 25 mm (0.98in): No. 1, 3, 5, 7, 11, 13 M8 x 45 mm (1.77 in): No. 2, 4, 6, 8, 10, 14 M8 x 123 mm (4.84in): No. 9, 12 Install rear plate cover.
2. Install the oil strainer to the oil pan (upper).
3. Install the oil pan (lower). Apply liquid gasket thoroughly (Scheme 18) Use Genuine RTV Silicone Sealant or equivalent. Refer to «RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS»(ref-233237-S23907478682006052500000). Tighten the oil pan (lower) bolts in numerical order (Scheme 19)
4. Install the oil pan drain plug.
5. Installation of the remaining components is in the reverse order of removal. Do not fill the engine oil for at least 30 minutes after oil pan is installed.

1. Check engine oil level and add engine oil if necessary. Refer to «OIL LEVEL»(ref-233255-S29260392382006052500000) .
2. Start the engine, and check for leaks of engine oil.
3. Stop engine and wait for 10 minutes.
4. Check engine oil level again.

Scheme 20

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

1. Frequent engine starts
2. Low ambient temperatures

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

1. Extended highway driving
2. Frequent high engine revolution NGK REFERENCE Make NGK Standard type PLFR5A-11 Hot type PLFR4A-11 Cold type PLFR6A-11 Gap (Nominal): 1.1 mm (0.043 in)

Scheme 21

Scheme 22

After installing the fuel tubes, make sure there are no fuel leaks at the connections using the following steps.

1. Apply fuel pressure to the fuel lines by turning ignition switch ON (with engine stopped). Then check for fuel leaks at the connections. NOTE: Use mirrors for checking on hidden points.
2. Start the engine and rev it up and check for fuel leaks at the connections. CAUTION: Do not touch the engine immediately after stopping, as engine becomes extremely hot.

Scheme 23

Scheme 24

1. Remove the engine room cover using power tool. Refer to «REMOVAL»(ref-233240-S39160149112006052500000).
2. Remove the air duct and resonator assembly. Refer to «REMOVAL»(ref-233240-S11402286492006052500000) (for left bank only).
3. Move the harness on the upper rocker cover and its peripheral aside.
4. Remove the electric throttle control actuator, loosening the bolts diagonally (for left bank only).
5. Remove the ignition coil. Refer to «REMOVAL»(ref-233240-S23007780522006052500000).
6. Remove the PCV hose from the PCV control valve.
7. Loosen the bolts in reverse order (Scheme 24)using power tool. CAUTION: Do not hold the rocker cover by the oil filler neck (right bank).

Scheme 25

Scheme 26

1. Apply liquid gasket to the joint part of the cylinder head and camshaft bracket following the steps below. NOTE: Illustration shows an example of left bank side (zoomed in shows No. 1 camshaft bracket). (Scheme 25)"a" to apply liquid gasket to the joint part of No. 1 camshaft bracket and cylinder head. (Scheme 25)"b" to apply liquid gasket 90° to illustration "a". Use Genuine RTV Silicone Sealant or equivalent. Refer to «RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS»(ref-233237-S23907478682006052500000).
2. Install the rocker cover. Make sure the new rocker cover gasket is installed in the groove of the rocker cover. Tighten the bolts in two steps in the numerical order (Scheme 26) 1st step: 2.0 N.m (0.2 kg-m, 18 in-lb) 2nd step: 8.3 N.m (0.85 kg-m, 73 in-lb) CAUTION: Do not hold the rocker cover by the oil filler neck (right bank).
3. Install the PCV hose. NOTE: Remove foreign materials from inside the hose using compressed air. The inserted length is within 25-30 mm (0.98-1.18 in) [Target: 25 mm (0.98 in)].
4. Installation of the remaining components is in the reverse order of removal.

Scheme 27

Note. To remove timing chain and associated parts, start with those on the left bank. The procedure for removing parts on the right bank is omitted because it is the same as that for removal on the left bank. To install timing chain and associated parts, start with those on the right bank. The procedure for installing parts on the left bank is omitted because it is the same as that for installation on the right bank.

Scheme 28

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Scheme 33

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Scheme 37

1. Remove the engine assembly from the vehicle. Refer to «REMOVAL»(ref-233240-S15370622752006052500000).
2. Remove the following components and related parts: Drive belt auto tensioner and idler pulley. Refer to «REMOVAL»(ref-233240-S26704070312006052500000). Thermostat housing and water hose. Refer to «REMOVAL OF THERMOSTAT HOUSING, WATER OUTLET AND HEATER PIPE»(ref-233257-S37977416792006052500000). Power steering oil pump bracket. Refer to «REMOVAL»(ref-233296-S38988189602006052500000). Oil pan (lower), (upper) and oil strainer. Refer to «REMOVAL»(ref-233240-S04669786312006052500000). Ignition coil. Refer to «REMOVAL»(ref-233240-S23007780522006052500000). Rocker cover. Refer to «REMOVAL»(ref-233240-S19460704282006052500000).
3. Remove the chain case cover (right bank) and (left bank). Loosen and remove the bolts in the reverse of order (Scheme 28) Cut the liquid gasket and remove the covers using Tool. Tool number: KV10111100 (J-37228) CAUTION: Do not damage mating surfaces.
4. Obtain compression TDC of No. 1 cylinder as follows: Turn the crankshaft pulley clockwise to align the TDC identification notch (without paint mark) with the timing indicator on the front cover. At this time, make sure both intake and exhaust cam lobes of No. 1 cylinder (top front on left bank) point outside. If they do not point outside, turn crankshaft pulley once more.
5. Remove the crankshaft pulley. Loosen the bolts using suitable tool. Remove the crankshaft pulley from the crankshaft. Remove the crankshaft pulley using suitable tool. Set the bolts in the two bolt holes [M6 x 1.0 mm (0.04 in)] on the front surface. NOTE: The dimension between the centers of the two bolt holes is 61 mm (2.40 in).
6. Remove the front cover. Loosen and remove the bolts in the reverse of order (Scheme 33) Cut the liquid gasket and remove the covers using Tool. Tool number: KV10111100 (J-37228) CAUTION: Do not damage mating surfaces.
7. Remove the front oil seal using suitable tool. CAUTION: Do not damage front cover.
8. Remove the oil pump drive spacer. Hold and remove the flat space of the oil pump drive spacer by pulling it forward.
9. Remove the oil pump. Refer to «REMOVAL»(ref-233255-S29512805102006052500000).
10. Remove the chain tensioner on the left bank using the following steps. NOTE: To remove the timing chain and associated parts, start with those on the left bank. The procedure for removing parts on the right bank is omitted because it is the same as that for the left bank. Squeeze the return-proof clip ends using suitable tool and push the plunger into the tensioner body. Secure the plunger using stopper pin. Stopper pin is made from hard wire approximately 1 mm (0.04 in) in diameter. Remove the bolts and chain tensioner. WARNING: Plunger, spring, and spring seat pop out when (squeezing) return-proof clip without holding plunger head. It may cause serious injuries. Always hold plunger head when removing. NOTE: Stop the plunger in the fully extended position by using the return-proof clip 1 if the stopper pin is removed. Push the plunger 2 into the tensioner body while squeezing the return-proof clip 1. Secure it using stopper pin 3.
11. Remove the chain tension guide and slack guide.
12. Remove the timing chain and crankshaft sprocket.
13. Loosen the camshaft sprocket bolts (Scheme 37)and remove the camshaft sprocket. CAUTION: To avoid interference between valves and pistons, do not turn crankshaft or camshaft when timing chain is disconnected.
14. Repeat the same procedure to remove the right timing chain and associated parts.

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

Scheme 38

1. In the same way as for the left bank, inspect the timing chain and associated parts on the right bank.

Scheme 39

Note. The above (Scheme 39) shows the relationship between the mating mark on each timing chain and that of the corresponding sprocket, with the components installed. To install the timing chain and associated parts, start with those on the right bank. The procedure for installing parts on the left bank is omitted because it is the same as that for installation on the right bank.

Scheme 40

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Scheme 47

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Scheme 49

Scheme 50

Scheme 51

1. Make sure the crankshaft key and dowel pin of each camshaft are facing in the direction (Scheme 40)
2. Install the camshaft sprockets. Install the intake and exhaust camshaft sprockets by selectively using the groove of the dowel pin according to the bank. (Common part used for both banks.) Lock the hexagonal part of the camshaft in the same way as for removal, and tighten the bolts.
3. Install the crankshaft sprockets for both banks. Install each crankshaft sprocket so that its flange side (the larger diameter side without teeth) faces in the direction (Scheme 42) NOTE: The same parts are used but facing directions are different.
4. Install the timing chains and associated parts. Align the mating mark on each sprocket and the timing chain for installation. CAUTION: Before installing chain tensioner, it is possible to change the position of mating mark on timing chain and each sprocket. After the mating marks are aligned, keep them aligned by holding them by hand. Install the slack guides and tension guides onto the correct side by checking the identification mark on the surface. Install the chain tensioner with the plunger locked in with the stopper pin. CAUTION: Before and after the installation of the chain tensioner, make sure that the mating mark on the timing chain is not out of alignment. After installing the chain tensioner, remove the stopper pin to release the tensioner. Make sure the tensioner is released. To avoid chain-link skipping of the timing chain, do not move crankshaft or camshafts until the front cover is installed.
5. In the same way as for the right bank, install the timing chain and associated parts on the left side.
6. Install the oil pump.
7. Install the oil pump drive spacer as follows: Install so that the front mark on the front edge of the oil pump drive spacer faces the front of the engine. Insert the oil pump drive spacer according to the directions of the crankshaft key and the two flat surfaces of the oil pump inner rotor. If the positional relationship does not allow the insertion, rotate the oil pump inner rotor to allow the oil pump drive spacer to be inserted.
8. Install the front oil seal using suitable tool. CAUTION: Do not scratch or make burrs on the circumference of the oil seal.
9. Install the chain tensioner cover. Apply liquid gasket (Scheme 45) Use Genuine RTV Silicone Sealant or equivalent. Refer to «RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS»(ref-233237-S23907478682006052500000)
10. Install the front cover as follows: Install a new O-ring on the cylinder block. Apply liquid gasket (Scheme 47) Use Genuine RTV Silicone Sealant or equivalent. Refer to «RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS»(ref-233237-S23907478682006052500000). Check again that the timing mating marks on the timing chain and on each sprocket are aligned. Then install the front cover. Install the bolts in the numerical order (Scheme 48) 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. M6 x 50 mm (1.97 in): No. 1, 20, 25, 26, 27 M6 x 80 mm (3.15 in): No. 4, 5, 7 M6 x 20 mm (0.79 in): Except the above
11. Install the chain case cover (right bank) and (left bank) as follows: Apply liquid gasket (Scheme 49) Use Genuine RTV Silicone Sealant or equivalent. Refer to «RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS»(ref-233237-S23907478682006052500000). CAUTION: The start and end of the application of the liquid gasket should be crossed at a position that cannot be seen after attaching the chain case cover. Install the bolts in the numerical order (Scheme 50)
12. Install the crankshaft pulley. Install the key of the crankshaft. Insert the pulley by lightly tapping it. CAUTION: Do not tap pulley on the side surface where the belt is installed (outer circumference).
13. Tighten the crankshaft pulley bolt. Lock the crankshaft using suitable tool, then tighten the bolt. Perform the following steps for angular tightening: Apply engine oil onto the threaded parts of the bolt and seating area. Select the one most visible notch of the four on the bolt flange. Corresponding to the selected notch, put a mating mark (such as paint) on the crankshaft pulley. Crankshaft pulley bolt torque Step 1: 93.1 N.m (9.5 kg-m, 69 ft-lb) Step 2: additional 90° (angle tightening)
14. Rotate the crankshaft pulley in normal direction (clockwise when viewed from engine front) to check for parts interference.
15. Installation of the remaining components is in the reverse of order of removal.

Scheme 52

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Scheme 60

Scheme 61

1. Remove the rocker cover (right bank) and (left bank). Refer to «REMOVAL AND INSTALLATION»(ref-233240-S19460704282006052500000).
2. Obtain compression TDC of No. 1 cylinder. Refer to «TIMING CHAIN»(ref-233240-S04092693052006052500000).
3. Remove the chain case cover (right bank) and (left bank). Refer to «REMOVAL»(ref-233240-S26555809132006052500000).
4. Paint matching marks on the timing chain links aligning with the camshaft sprocket matching marks.
5. Remove the chain tensioner on the left bank using the following steps. WARNING: Plunger, spring, and spring seat pop out when squeezing return-proof clip without holding plunger head. It may cause serious injuries. Always hold plunger head when removing. Squeeze return-proof clip ends using suitable tool and push the plunger into the tensioner body. Secure plunger using stopper pin. Stopper pin is made from hard wire approximately 1 mm (0.04 in) in diameter. Remove the bolts and the chain tensioner. NOTE: Stop plunger in the fully extended position using return-proof clip 1 if stopper pin is removed. Push the plunger 2 into the tensioner body while squeezing the return-proof clip 1. Secure it using stopper pin 3.
6. Remove the right chain tensioner cover from the front cover using Tool. Tool number: KV10111100 (J-37228) CAUTION: Do not damage mating surfaces.
7. Remove chain tensioner on right bank using the following steps. WARNING: Plunger, spring, and spring seat pop out when squeezing return-proof clip without holding plunger head. It may cause serious injuries. Always hold plunger head when removing. Squeeze return-proof clip ends using suitable tool and push the plunger into the tensioner body. Secure plunger using stopper pin. Stopper pin is made from hard wire approximately 1 mm (0.04 in) in diameter. Remove the bolts and the right bank chain tensioner. NOTE: If it is difficult to push plunger on right bank chain tensioner, remove the plunger under extended condition.
8. Loosen camshaft sprocket bolts (Scheme 59)and remove camshaft sprockets. CAUTION: To avoid interference between valves and pistons, do not turn crankshaft or camshaft with timing chain disconnected.
9. Remove the front cover bolts.
10. Remove bolts in the reverse of order (Scheme 61)to remove camshaft brackets. Remove No. 1 camshaft bracket. NOTE: The bottom and front surface of bracket will be stuck because of liquid gasket.
11. Remove the camshaft.
12. Remove the valve lifters if necessary. Correctly identify location where each part is removed from. Keep parts organized to avoid mixing them up.

Scheme 62

1. Put V block on precise flat work bench, and support No. 1 and No. 5 journals of the camshaft.
2. Set dial indicator vertically to No. 3 journal.
3. Turn the camshaft to one direction, and measure the camshaft runout on dial indicator (total indicator reading). Camshaft runout: Less than 0.02 mm (0.0008 in) If measurement exceeds specification, replace the camshaft.

Scheme 63

1. Measure the camshaft cam height. Standard cam height (intake & exhaust): 44.465-44.655 mm (1.7506-1.7581 in) Cam wear limit (intake & exhaust): 0.02 mm (0.0008 in)
2. If measurement is not within the specifications, replace the camshaft.

Scheme 64

1. Measure the diameter of the camshaft journal. Standard diameter: 25.953-25.970 mm (1.0218-1.0224 in)

INSPECTION

Note. Perform the following inspection after removal, installation or replacement of camshaft or valve-related parts, or if there are unusual engine conditions due to changes in valve clearance over time (starting, idling, and/or noise).

Scheme 65

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Scheme 70

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Scheme 72

1. Warm up the engine. Then stop the engine.
2. Remove the engine cover, battery cover and air duct assembly. Refer to «REMOVAL AND INSTALLATION»(ref-233240-S39160149112006052500000), «REMOVAL AND INSTALLATION»(ref-233309-S29185018132006052500000) and «REMOVAL AND INSTALLATION»(ref-233240-S11402286492006052500000).
3. Remove the right bank and left bank rocker covers using power tool. Refer to «REMOVAL»(ref-233240-S19460704282006052500000).
4. Turn the crankshaft pulley in the normal direction (clockwise when viewed from engine front) to align TDC identification notch (without paint mark) with timing indicator.
5. At this time, make sure both the 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 once more.
6. Measure valve clearances at the locations marked "x" as shown in the (Scheme 67) (locations indicated with black arrow). NOTE: Firing order 1-8-7-3-6-5-4-2 No. 1 cylinder compression TDC Measure valve clearance using suitable tool. 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) *: Approximately 80°C (176°F) CAUTION: If the inspection was carried out with a cold engine, make sure the values with a fully warmed up engine are still within specifications.
7. Turn the crankshaft pulley clockwise 270° from the position of No. 1 cylinder compression TDC to obtain No. 3 cylinder compression TDC.
8. Measure valve clearances at the locations marked "x" as shown in the (Scheme 70) (locations indicated with white arrow). No. 3 cylinder compression TDC
9. Turn the crankshaft pulley clockwise 90° from the position of No. 3 cylinder compression TDC (clockwise by 360° from the position of No. 1 cylinder compression TDC) to measure the intake and exhaust valve clearances of No. 6 cylinder and the exhaust valve clearance of No. 2 cylinder.
10. If out of specifications, adjust as necessary. Refer to «ADJUSTMENT»(ref-233240-S29967642202006052500000).

1. Before starting the engine, check oil/fluid levels including engine coolant and engine oil. If the levels are lower than required quantity, fill to the specified level. Refer to «RECOMMENDED FLUIDS AND LUBRICANTS»(ref-233319-S33947607032006052500000) .
2. Use procedure below to check for fuel leakage.
3. Turn ignition switch ON (with engine stopped). With fuel pressure applied to the fuel piping, check for fuel leakage at the connection points.
4. Start engine. With engine speed increased, check again for fuel leakage at connection points.
5. Run engine to check for unusual noise and vibration.
6. Warm up engine thoroughly to make sure there is no leakage of fuel, exhaust gas, or any oils/fluids including engine oil and engine coolant.
7. Bleed air from passages in lines and hoses, such as in cooling system.
8. After cooling down the engine, again check oil/fluid levels including engine oil and engine coolant. Refill to specified level if necessary.
9. Summary of the inspection items

ENGINE RUNNING REFERENCE

Scheme 73