INFINITI QX56 2007 Factory Service Manual

FUEL INJECTOR AND FUEL TUBEEM-31
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FUEL INJECTOR AND FUEL TUBE
Removal and InstallationINFOID:0000000003531531
CAUTION:
Do not remove or disassemble parts unless instructed as shown.
REMOVAL
1. Remove the engine room cover using power tool. Refer to
EM-12, "Removal and Installation".
2. Release the fuel pressure. Refer to EC-80, "
Fuel Pressure Check".
3. Disconnect the negative battery terminal.
4. Disconnect the fuel injector harness connectors.
5. Disconnect the fuel hose assembly from the fuel tubes (RH and LH).
CAUTION:
• While hoses are disconnected, plug th em to prevent fuel from draining.
• Do not separate the fuel connector and fuel hose.
6. Remove the fuel injectors with the fuel tube assembly.
1. Fuel tube (RH) 2. Cap 3. Fuel damper
4. O-ring 5. O-ring (b lue) 6. Fuel injector
7. Clip 8. O-ring (brown) 9. O-ring
10. Fuel hose assembly 11. Fuel tube (LH)
KBIA2472E

EM-32
< SERVICE INFORMATION >
FUEL INJECTOR AND FUEL TUBE
7. Remove the fuel injector from the fuel tube using the followingsteps.
a. Spread open and remove the clip.
b. Remove the fuel injector from the fuel tube by pulling straight out.
CAUTION:
• Be careful with remaining fuel that may leak out from fueltube.
• Do not damage injector nozzles during removal.
• Do not bump or drop fuel injectors.
• Do not disassemble fuel injectors.
8. Remove the fuel damper from each fuel tube.
INSTALLATION
1. Install the fuel damper to each fuel tube using the following steps.
a. Apply engine oil to the new O-ring and set it into the cup of the fuel tube.
CAUTION:
• Handle O-ring with bare hands. Never wear gloves.
• Lubricate new O-ring with new engine oil.
• Do not clean O-ring with solvent.
• Make sure that O-ring and its mating part are free of for-eign material.
• When installing O-ring, do not scratch it with tool or fin-
gernails.
• Do not twist or stretch the O-ring.
b. Make sure that the backup spacer is in the O-ring connecting surface of the fuel damper.
NOTE:
The backup spacer is part of the fuel damper assembly.
c. Insert the fuel damper until it seats on the fuel tube. CAUTION:
• Insert straight, making sure that the axis is lined up.
• Do not pressure-fit with excessive force.
d. Install the cap, and then tighten the bolts evenly. • After tightening the bolts, make sure that there is no gap between the cap and fuel tube.
2. Install new O-rings to the fuel injector paying attention to the items below. CAUTION:
• Upper and lower O-rings are different colors.
• Handle O-ring with bare hands. Never wear gloves.
KBIA2506E
Reference value :130 N (13.3 kg, 29.2 lb)
Fuel tube side : Blue
Nozzle side : Brown
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FUEL INJECTOR AND FUEL TUBEEM-33
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• Lubricate new O-ring with new engine oil.
• Do not clean O-ring with solvent.
• Make sure that O-ring and its mating
part are free of foreign material.
• When installing O-ring, be careful not to scratch it with tool or fingernails. Also be careful not to
twist or stretch O-ring.
• If O-ring was stretched while it was being att ached, do not insert it quickly into fuel tube.
• Insert O-ring straight into fuel tube. Do not angle or twist it.
3. Install the fuel injector to the fuel tube using the following steps.
a. Insert new clip into clip mounting groove on the fuel injector. • Insert clip so that lug ″A ″ of fuel injector matches notch ″A ″ of
the clip.
CAUTION:
• Do not reuse clip. Replace it with a new one.
• Do not allow the clip to interf ere with the O-ring. If inter-
ference occurs, replace the O-ring.
b. Insert the fuel injector into the fuel tube with the clip attached. • Insert it while matching it to the axial center.
• Insert fuel injector so that lug ″B ″ of fuel tube matches notch
″ B ″ of the clip.
• Make sure that the fuel tube flange is securely seated in the flange fixing groove on the clip.
c. Make sure that installation is complete by checking that the fuel injector does not rotate or come off.
• Make sure that the protrusions of the fuel injectors are alignedwith the cutouts of the clips after installation.
4. Install the fuel tube and fuel injector assembly to the intake manifold. CAUTION:
Do not let the tip of the injector nozz le come in contact with other parts.
• Tighten fuel tube assembly bolts ″a ″ to ″b ″ in illustration in two
steps.
5. Install the fuel hose assembly. • Insert connectors straight, making su re that the axis is lined up with fuel tube side to prevent O-ring from
being damaged.
• Tighten bolts evenly in several steps.
• Make sure that there is no gap between the flange and fuel tube after tightening the bolts.
CAUTION:
• Handle O-ring with bare hands. Do not wear gloves.
• Lubricate O-ring with new engine oil.
• Do not clean O-ring with solvent.
• Make sure that O-ring and its mating part are free of foreign material.
• When installing O-ring, be careful not to scratch it with tool or fingernails. Also be careful not to
twist or stretch O-ring.
• If O-ring was stretched while it was being att ached, do not insert it quickly into fuel tube.
• Insert new O-ring straight into fuel tube. Do not twist it.
KBIA2507E
1st step : 12.8 N·m (1.3 kg-m, 9 ft-lb)
2nd step : 24.5 N·m (2.5 kg-m, 18 ft-lb)
KBIA2474E

EM-34
< SERVICE INFORMATION >
FUEL INJECTOR AND FUEL TUBE
6. Installation of the remaining components is in the reverse order of removal.
INSPECTION AFTER INSTALLATION
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.

ROCKER COVEREM-35
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ROCKER COVER
Removal and InstallationINFOID:0000000003531532
REMOVAL
1. Remove the engine room cover using power tool. Refer to
EM-12, "Removal and Installation".
2. Remove the air duct and resonator assembly. Refer to EM-15, "
Removal and Installation" (for LH 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 LH only).
5. Remove the ignition coils. Refer to EM-28, "
Removal and Installation".
6. Remove the PCV hose from the PCV control valves. •⇐ : Engine front
7. Loosen the bolts in reverse order shown using power tool for rocker cover (A) or (B).
CAUTION:
Do not hold the rocker cover ( RH) (B) by the oil filler neck.
INSTALLATION
1. Rocker cover (LH) 2. PCV control valve 3. O-ring
4. Rocker cover gasket (LH) 5. Rocker cover (RH) 6. PCV control valve
7. O-ring 8. Oil filler cap 9 . Rocker cover gasket (RH)
KBIA2508E
WBIA0697E

EM-36
< SERVICE INFORMATION >
ROCKER COVER
1. Apply liquid gasket to the joint part of the cylinder head andcamshaft bracket following the steps below.
NOTE:
Illustration shows an example of (LH) side (zoomed in shows
No.1 camshaft bracket).
a. Refer to illustration ″a ″ to apply liquid gasket to the joint part of
No.1 camshaft bracket and cylinder head.
b. Refer to illustration ″b ″ to apply liquid gasket 90 ° to illustration
″ a ″.
Use Genuine RTV Silicone Seal ant or equivalent. Refer to
GI-45, "
Recommended Chemical Product and Sealant".
2. Install the rocker cover (A) or (B). • Make sure the new rocker cover gasket is installed in the groove of the rocker cover (A) or (B).
• Tighten the bolts in two steps in the numerical order shown.
CAUTION:
Do not hold the rocker cover (RH) (B) by the oil filler neck.
3. Install the PCV hoses. NOTE:
• Remove foreign materials from inside the hose using com-
pressed air.
• The inserted length is within 25 - 30 mm (0.98 - 1.18 in) [Tar-
get: 25 mm (0.98 in)].
4. Installation of the remaining components is in the reverse order of removal.
KBIA2510E
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)
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TIMING CHAINEM-37
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TIMING CHAIN
Exploded ViewINFOID:0000000003591548
AWBIA0100GB

EM-38
< SERVICE INFORMATION >
TIMING CHAIN
Removal and Installation
INFOID:0000000003531533
NOTE:
• To remove timing chain and associated parts, start with those on the LH bank. The procedure for removing parts on the RH bank is omitted because it is the same as that for removal on the LH bank.
• To install 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 t he same as that for installation on the RH bank.
REMOVAL
1. Remove the engine assembly from the vehicle. Refer to EM-74, "Removal and Installation".
2. Remove the following components and related parts: • Drive belt auto tensioner and idler pulley. Refer to EM-13, "
Removal and Installation".
• Thermostat housing and water hose. Refer to CO-20, "
Removal and Installation".
• Power steering oil pump bracket. Refer to LU-14, "
Removal and Installation".
• Oil pan (lower), (upper) and oil strainer. Refer to EM-24, "
Removal and Installation".
• Ignition coil. Refer to EM-28, "
Removal and Installation".
• Rocker cover. Refer to EM-35, "
Removal and Installation".
3. Remove the chain case cover RH bank (A) and chain case cover LH bank (B) as follows:
a. Loosen and remove the bolts as shown.
b. Cut the liquid gasket and remove the covers using Tool.
CAUTION:
Do not damage mating surfaces.
1. Camshaft sprocket LH bank EXH 2. Camshaft sprocket LH bank INT (VTC)3. Camshaft sprocket RH bank INT
(VTC)
4. Camshaft sprocket RH bank EXH 5. Front cover 6. Intake valve control solenoid valve (RH)
7. Intake valve control solenoid valve cover (RH) 8. Intake valve timing control position
sensor (RH) 9. Intake valve timing control position
sensor (LH)
10. Intake valve control solenoid valve cover (LH) 11. Camshaft position sensor (PHASE) 12 Crankshaft pulley bolt
13. Crankshaft pulley 14. Chain tensioner cover 15. Front oil seal
16. Intake valve control solenoid valve (RH) 17. O-ring 18. Timing chain tension guide RH bank
19. Timing chain slack guide (RH) 20. Timing chain RH bank 21. Timing chain LH bank
22. Chain tensioner (RH) 23. Timing chain slack guide LH bank 24. Timing chain tension guide LH bank
25. Chain tensioner (LH) 26. O-ring 27. Bracket
28. Oil pump drive spacer 29. Oil pump assembly 30. Crankshaft sprocket
A. To crankshaft B. To camshaft LH bank EXH C. To camshaft LH bank INT (VTC)
D. To camshaft RH bank INT (VTC) E. To camshaft RH bank EXH F. Apply sealant to mating side
G. Refer to EM-38
Tool number : KV10111100 (J-37228)
WBIA0798E

TIMING CHAINEM-39
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4. Obtain compression TDC of No. 1 cylinder as follows:
a. Turn the crankshaft pulley clockwise to align the TDC identifica-
tion notch (without paint mark) with the timing indicator on the
front cover.
b. At this time, make sure both intake and exhaust cam lobes of No. 1 cylinder (top front on LH bank) point outside.
• If they do not point outside, turn crankshaft pulley once more.
5. Remove the crankshaft pulley.
a. Loosen the crankshaft pulley bolts using a hammer handle to secure the crankshaft.
b. Remove the crankshaft pulley from the crankshaft using tool. • Remove the crankshaft pulley using suitable tool. Set the boltsin the two bolt holes [M6 x 1.0 mm (0.04 in)] on the front sur-
face.
NOTE:
The dimension between the centers of the two bolt holes is 61
mm (2.40 in).
6. Remove the front cover.
a. Loosen and remove the bolts in the reverse of order shown.
b. Cut the liquid gasket and remove the covers using Tool. CAUTION:
Do not damage mating surfaces.
7. Remove the front oil seal using suitable tool. CAUTION:
Do not damage front cover.
KBIA2476E
KBIA0400J
PBIC0053E
KBIA2477E
Tool number : KV10111100 (J-37228)
KBIA2478E

EM-40
< SERVICE INFORMATION >
TIMING CHAIN
8. Remove the oil pump drive spacer.• Hold and remove the flat space of the oil pump drive spacer bypulling it forward.
9. Remove the oil pump. Refer to LU-14, "
Removal and Installation".
10. Remove the chain tensioner on the LH bank using the following steps. NOTE:
To remove the timing chain and associated parts, start with those on the LH bank. The procedure for
removing parts on the RH bank is omitted because it is the same as that for the LH bank.
a. Squeeze the return-proof clip ends using suitable tool and push the plunger into the tensioner body.
b. Secure the plunger using stopper pin. • Stopper pin is made from hard wire approximately 1 mm (0.04
in) in diameter.
c. 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. Alw ays 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 timing chain tension guide and timing chain slack guide.
12. Remove the timing chain and crankshaft sprocket.
13. Loosen the camshaft sprocket bolts as shown and remove the camshaft sprocket.
CAUTION:
To avoid interference between valves and pistons, do not
turn crankshaft or camshaft wh en timing chain is discon-
nected.
14. Repeat the same procedure to remove the RH timing chain and associated parts.
INSPECTION AFTER REMOVAL
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