Engine Mechanical: Diagnosis Nissan Armada I рестайлинг

Precaution 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.

SYMPTOM CHART

Scheme 10

1. Remove air duct and resonator assembly when inspecting drive belt.
2. Make sure that indicator (single line notch) of each auto tensioner is within the allowable working range (between three line notches). NOTE: Check the drive belt auto tensioner indication when the engine is cold. The indicator notch is located on the moving side of the drive belt auto tensioner.
3. Visually check entire belt for wear, damage or cracks.
4. If the indicator is out of allowable working range or belt is damaged, replace the belt. Refer to «DRIVE BELTS»(ref-382166-S23734070462011011400000) .

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 11

Scheme 12

Scheme 13

Scheme 14

1. Warm up the engine. Then stop the engine.
2. Remove the engine room cover. Refer to " «REMOVAL AND INSTALLATION»(ref-382166-S06809567622011011400000) ".
3. Remove the air cleaner and air duct assembly. Refer to " «REMOVAL AND INSTALLATION»(ref-382166-S41619510092011011400000) ".
4. Remove the RH bank and LH bank rocker covers using power tool. Refer to " «REMOVAL AND INSTALLATION»(ref-382166-S39479873192011011400000) ".
5. 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.
6. At this time, make sure both the intake and exhaust cam noses of No. 1 cylinder (top front on LH bank) face outside. If they do not face outside, turn crankshaft pulley once more.
7. Measure valve clearances at the locations marked "x" as shown in the table below (locations indicated with black arrow). <--: Engine front <--: (black): Measurable at No. 1 cylinder compression top dead center <--: (white): Measurable at No. 3 cylinder compression top dead center A: RH B: LH C: Exhaust D: Intake NOTE: Firing order 1-8-7-3-6-5-4-2 No. 1 cylinder compression TDC VALVE CLEARANCES SPECIFICATION Measuring position (RH bank) No. 2 cyl (E) No. 4 cyl (F) No. 6 cyl (G) No. 8 cyl (H) No. 1 cylinder at TDC EXH x INT x x Measuring position (LH bank) No. 1 cyl (J) No. 3 cyl (K) No. 5 cyl (L) No. 7 cyl (M) No. 1 cylinder at TDC INT x x EXH x x Measure valve clearance using suitable tool. Refer to " «STANDARD AND LIMIT»(ref-382166-S15428287382011011400000) ". 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.
8. Turn the crankshaft pulley clockwise 270° from the position of No. 1 cylinder compression TDC to obtain No. 3 cylinder compression TDC.
9. Measure valve clearances at the locations marked "x" as shown in the table below (locations indicated with arrow). <--: Engine front <--: (black): Measurable at No. 1 cylinder compression top dead center <--: (white): Measurable at No. 3 cylinder compression top dead center A: RH B: LH C: Exhaust D: Intake NOTE: Firing order 1-8-7-3-6-5-4-2 No. 3 cylinder compression TDC VALVES CLEARANCE SPECIFICATION Measuring position (RH bank) No. 2 cyl (E) No. 4 cyl (F) No. 6 cyl (G) No. 8 cyl (H) No. 3 cylinder at TDC EXH x INT x Measuring position (LH bank) No. 1 cyl (J) No. 3 cyl (K) No. 5 cyl (L) No. 7 cyl (M) No. 3 cylinder at TDC INT x x EXH x x Measure valve clearance using suitable tool. Refer to " «STANDARD AND LIMIT»(ref-382166-S15428287382011011400000) ". 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.
10. 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 (G) and the exhaust valve clearance of No. 2 cylinder (E). <--: Engine front A: RH B: LH C: Exhaust D: Intake E: No. 2 cylinder F: No. 4 cylinder G: No. 6 cylinder H: No. 8 cylinder J: No. 1 cylinder K: No. 3 cylinder L: No. 5 cylinder M: No. 7 cylinder
11. If out of specifications, adjust as necessary.

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-382156-S25631055982011011400000) ".
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-382156-S08212270612011011400000) ".

Scheme 15

INSPECTION AFTER REMOVAL

Surface Distortion

Scheme 16

1. Check the flatness of each exhaust manifold flange surface using suitable tools. Flatness limit : 0.3 mm (0.012 in)
2. If measurement exceeds the limit, replace the exhaust manifold.

Clean the oil strainer.

Scheme 17

Scheme 18

Scheme 19

Scheme 20

1. Install the oil pan (upper) using the following steps. Using a scraper to remove old liquid gasket from mating surfaces Also remove old liquid gasket from mating surface of oil pan (upper). Remove old liquid gasket from bolt holes and threads. CAUTION: Do not scratch or damage the mating surfaces when cleaning off old liquid gasket. Apply liquid gasket thoroughly as shown in the figure using tool. Tool number : WS39930000 ( - ) Use Genuine RTV Silicone Sealant or equivalent. Refer to " «RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS»(ref-382152-S15373783892011011400000) ". CAUTION: Apply liquid gasket to outside of bolt hole for the hole shown by * in the figure. Install new O-rings to the oil pump and front cover side. Tighten the bolts in numerical order as shown below. M6 x 30 mm (1.18 in) : No. 16, 17 M8 x 25 mm (0.98 in) : No. 1, 3, 5, 7, 9, 13, 15 M8 x 45 mm (1.77 in) : No. 2, 4, 6, 8, 10, 14 M8 x 123 mm (4.84 in) : No. 11, 12
2. Install the oil strainer to the oil pan (upper).
3. Install the oil pan (lower). Using a scraper to remove old liquid gasket from mating surfaces. Also remove old liquid gasket from mating surface of oil pan (upper). Remove old liquid gasket from bolt holes and thread. CAUTION: Do not scratch or damage the mating surfaces when cleaning off old liquid gasket. Apply liquid gasket thoroughly as shown in the figure using tool. Tool number : WS39930000 ( - ) Use Genuine RTV Silicone Sealant or equivalent. Refer to " «RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS»(ref-382152-S15373783892011011400000) ". CAUTION: Installation should be done within 5 minutes after applying liquid gasket. Tighten the oil pan (lower) bolts in numerical order as shown in the figure.

1. Check engine oil level and add engine oil if necessary. Refer to " «INSPECTION»(ref-382188-S37522985312011011400000) ".
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 21

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

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

Scheme 22

1. Remove engine room cover using power tool. Refer to , " «Removal and Installation»(ref-382166-S06809567622011011400000) ".
2. Remove air duct and resonator assembly. Refer to , " «Removal and Installation»(ref-382166-S41619510092011011400000) ".
3. Remove drive belt. Refer to , " «Removal and Installation»(ref-382166-S33342919592011011400000) ".
4. Disconnect Intake valve timing control solenoid valve connector (LH).
5. Remove Intake valve timing control solenoid valve (LH) (2) and O-ring (3) from Intake valve timing control solenoid valve cover (LH) (1).

1. Before starting engine, check oil/fluid levels including engine coolant and engine oil. If less than required quantity, fill to the specified level. Refer to , " «FOR NORTH AMERICA : FLUIDS AND LUBRICANTS»(ref-382161-S12522039562011011400000) ".
2. Use procedure below to check for fuel leakage
3. Turn ignition switch ON (with engine stopped). With fuel pressure applied to fuel piping, check for fuel leakage at 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. NOTE: If hydraulic pressure inside timing chain tensioner drops after removal and installation, slack in the guide may generate a pounding noise during and just after engine start. However, this is normal. Noise will stop after hydraulic pressure rises.
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 engine, again check oil/fluid levels including engine oil and engine coolant. Refill to specified level, if necessary.
9. Summary of the inspection items: INSPECTION CHART Item Before starting engine Engine running After engine stopped Engine coolant Level Leakage Level Engine oil Level Leakage Level Other oils and fluids () Level Leakage Level Fuel Leakage Leakage Leakage Exhaust gas - Leakage - (1) Transmission/transaxle/CVT fluid, power steering fluid, brake fluid, etc.

Scheme 23

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

Scheme 24

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

Scheme 25

Note. The illustration above 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 RH bank. The procedure for installing parts on the LH bank is omitted because it is the same as that for installation on the RH bank.

Scheme 26

Scheme 27

Scheme 28

Scheme 29

Scheme 30

1. Make sure the crankshaft key and RH bank camshaft dowel pin and LH bank camshaft dowel pin are facing in the direction shown in the figure.
2. Install the camshaft sprockets. Install the camshaft sprocket INT (VTC) (A) and camshaft sprockets EXH (B) by selectively using the groove of the dowel pin according to the bank. (Common part used for both exhaust banks.) NOTE: Use the groove marked "R" for RH bank and "L" for LH bank. 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 LH bank crankshaft sprocket (B) and RH bank crankshaft sprocket (C) so that their flange side (A) (the larger diameter side without teeth) faces in the direction shown in the figure. NOTE: The same parts are used but facing directions are different.
4. Install the timing chains and associated parts. Align the alignment mark on each sprocket and the timing chain for installation. CAUTION: Before installing timing chain tensioner, it is possible to change the position of alignment mark on timing chain and each sprocket. After the alignment 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 timing chain tensioner with the plunger locked in with the stopper pin. CAUTION: Before and after the installation of the timing chain tensioner, make sure that the alignment mark on the timing chain is not out of alignment. After installing the timing 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 RH bank, install the timing chain and associated parts on the LH bank.
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 as shown in the figure. Use Genuine RTV Silicone Sealant or equivalent. Refer to " «RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS»(ref-382152-S15373783892011011400000) ".
10. Installation of the remaining components is in the reverse order of removal. Refer to , " «Removal and Installation»(ref-382166-S10598877632011020100000) ".

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 " «FOR NORTH AMERICA : FLUIDS AND LUBRICANTS»(ref-382161-S12522039562011011400000) ".
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. NOTE: If hydraulic pressure inside timing chain tensioner drops after removal and installation, slack in the guide may generate a pounding noise during and just after engine start. However, this is normal. Noise will stop after hydraulic pressure rises.
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: INSPECTION CHART Item Before starting engine Engine running After engine stopped Engine coolant Level Leakage Level Engine oil Level Leakage Level Other oils and fluids (1) Level Leakage Level Fuel Leakage Leakage Leakage Exhaust gas - Leakage - (1) Transmission/transaxle/CVT fluid, power steering fluid, brake fluid, etc.

Scheme 31

Camshaft Runout

Scheme 32

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 33

1. Measure the camshaft cam height. Standard cam height (intake) : 44.865 - 45.055 mm (1.7663 - 1.7738 in) Standard cam height (exhaust) : 45.075 - 45.265 mm (1.7746 - 1.7821 in) Cam wear limit (intake & exhaust) : 0.02 mm (0.0008 in)
2. If measurement is not within the specifications, replace the camshaft.

INSPECTION OF CAMSHAFT SPROCKET (INT) OIL GROOVE

1. Check engine oil level. Refer to " «INSPECTION»(ref-382188-S37522985312011011400000) ".
2. Perform the following procedure so as to prevent the engine from being unintentionally started while checking. Release fuel pressure. Refer to " «FUEL PRESSURE CHECK»(ref-382156-S12051436202011011400000) ". Disconnect ignition coil and injector harness connectors if practical.
3. Remove IVT control solenoid valve.
4. Crank engine, and then make sure that engine oil comes out from IVT control cover oil hole. End cranking after checking. WARNING: Be careful not to touch rotating parts (drive belts, idler pulley, and crankshaft pulley, etc.). CAUTION: Engine oil may squirt from IVT control solenoid valve installation hole during cranking. Use a shop cloth to prevent engine oil from splashing on worker, engine components and vehicle. Do not allow engine oil to get on rubber components such as drive belts or engine mount insulators. Immediately wipe off any splashed engine oil.
5. Clean oil groove between oil strainer and IVT control solenoid valve if engine oil does not come out from IVT control valve cover oil hole. Refer to " «SCHEMATIC»(ref-382188-S05635777372011011400000) ".
6. Remove components between IVT control solenoid valve and camshaft sprocket (INT), and then check each oil groove for clogging. Clean oil groove if necessary.
7. After inspection, installation of the remaining components is in the reverse order of removal.

Scheme 34

Scheme 35

1. Remove the camshaft relating to the valve oil seal to be removed. Refer to " «REMOVAL AND INSTALLATION»(ref-382166-S09349934232011011400000) ".
2. Remove the valve lifters. Refer to " «EXPLODED VIEW»(ref-382166-S13763466152011011400000) ". Correctly identify the location where each part is removed from. Keep parts organized to avoid mixing them up.
3. Turn the crankshaft until the cylinder requiring new oil seals is at TDC. This will prevent the valve from dropping into the cylinder.
4. Remove the valve collet using Tool. Tool number : KV10116200 (J-26336-A) : KV10115900 (J-26336-20) : KV10109220 (-) CAUTION: Do not damage the valve lifter holes.
5. Remove the valve spring retainer and valve spring. CAUTION: Do not remove the valve spring seat from the valve spring.
6. Remove the valve oil seal using Tool. Tool number : KV10107902 (J-38959)

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 " «FOR NORTH AMERICA : FLUIDS AND LUBRICANTS»(ref-382161-S12522039562011011400000) ".
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. NOTE: If hydraulic pressure inside timing chain tensioner drops after removal and installation, slack in the guide may generate a pounding noise during and just after engine start. However, this is normal. Noise will stop after hydraulic pressure rises.
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: INSPECTION CHART Item Before starting engine Engine running After engine stopped Engine coolant Level Leakage Level Engine oil Level Leakage Level Other oils and fluids (1) Level Leakage Level Fuel Leakage Leakage Leakage Exhaust gas - Leakage - (1) Transmission/transaxle/CVT fluid, power steering fluid, brake fluid, etc.

Scheme 36

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 " «FOR NORTH AMERICA : FLUIDS AND LUBRICANTS»(ref-382161-S12522039562011011400000) ".
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. NOTE: If hydraulic pressure inside timing chain tensioner drops after removal and installation, slack in the guide may generate a pounding noise during and just after engine start. However, this is normal. Noise will stop after hydraulic pressure rises.
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: INSPECTION CHART Item Before starting engine Engine running After engine stopped Engine coolant Level Leakage Level Engine oil Level Leakage Level Other oils and fluids (1) Level Leakage Level Fuel Leakage Leakage Leakage Exhaust gas - Leakage - (1) Transmission/transaxle/CVT fluid, power steering fluid, brake fluid, etc.

Scheme 37