check oil INFINITI QX56 2004 Factory Service Manual

CYLINDER HEAD
EM-59
C
D
E
F
G
H
I
J
K
L
MA
EM
Revision: August 20072004 QX56
CYLINDER HEADPFP:11041
On-Vehicle ServiceEBS00ILS
CHECKING COMPRESSION PRESSURE
1. Warm up engine thoroughly. Then stop engine.
2. Release fuel pressure. Refer to EC-46, "
FUEL PRESSURE RELEASE" .
a. Remove fuel pump fuse, and start engine.
Refer to PG-78, "
FUSE AND RELAY BOX" or fuel pump fuse location.

Let fuel pump fuse removed until the end of step 7.
b. After engine stalls, crank it two or three times to release all fuel pressure.
3. Remove ignition coil and spark plug from each cylinder.
Refer to EM-27, "
REMOVAL" .
4. Connect engine tachometer (not required in use of CONSULT-II).
5. Install compression tester with Tool into spark plug hole.
6. With accelerator pedal fully depressed, turn ignition switch to “START” for cranking. When the gauge
pointer stabilizes, read the compression pressure and engine rpm. Perform these steps to check each cyl-
inder.
Unit: kPa (kg/cm2 , psi) /rpm
CAUTION:
Always use a fully charged battery to obtain specified engine speed.

If the engine speed is out of specified range, check battery liquid for proper gravity. Check engine
speed again with normal battery gravity.

If compression pressure is below minimum value, check valve clearances and parts associated with
combustion chamber (valve, valve seat, piston, piston ring, cylinder bore, cylinder head, cylinder head
gasket). After the checking, measure compression pressure again.

If some cylinders have low compression pressure, pour small amount of engine oil into the spark plug
hole of the cylinder to re-check it for compression.
–If the added engine oil improves the compression, the piston rings may be worn out or damaged. Check
the piston rings and replace if necessary.
–If the compression pressure remains at low level despite the addition of engine oil, the valves may be
malfunctioning. Check the valves for damage. Replace the valve or valve seat accordingly.

If two adjacent cylinders have respectively low compression pressure and their compression remains
low even after the addition of engine oil, the gaskets may be leaking, or valve in adjacent cylinders may
be damaged. Inspect and repair as required.
7. After inspection is complete, install removed parts. Installation is in the reverse order of removal.
8. Start engine, and confirm that engine runs smoothly.
9. Perform trouble diagnosis. If DTC appears, erase it. Refer to EC-71, "
TROUBLE DIAGNOSIS" . Tool number : EG15050500 (J-45402)
WBIA0605E
Standard MinimumDeference limit
between cylinders
1,520 (15.5, 220) / 200 1,324 (13.5, 192) / 200 98 (1.0, 14) / 300

CYLINDER HEAD
EM-61
C
D
E
F
G
H
I
J
K
L
MA
EM
Revision: August 20072004 QX56
INSPECTION AFTER REMOVAL
Cylinder Head Bolts Diameter

Cylinder head bolts are tightened by plastic zone tightening
method. Whenever the size difference between d1 and d2
exceeds the limit, replace the bolts with new one.

If reduction of diameter appears in a position other than d2, use
it as d2 point.
INSTALLATION
1. Install cylinder head gasket.
2. Install cylinder head. Follow the steps below and tighten the
bolts in the numerical order shown.
CAUTION:

If cylinder head bolts are re-used, check their diameters
before installation. Refer to EM-61, "
Cylinder Head Bolts
Diameter" .
a. Apply engine oil to threads and seating surface of bolts.
b. Measure tightening angle using Tool.
CAUTION:
Measure tightening angle using Tool. Do not measure visu-
ally.
3. Installation of the remaining components is in the reverse order of removal.Limit (d1 - d2) : 0.18 mm (0.0071 in)
KBIA0189E
Step a : 98.1 N·m (10 kg-m, 72 ft-lb)
Step b :Loosen in the reverse order of tightening.
Step c : 44.1 N·m (4.5 kg-m, 33 ft-lb)
PBIC0068E
Tool number : KV10112100 (BT-8653-A)
Step d : 60° clockwise
Step e : 60° clockwise
WBIA0603E

EM-68Revision: August 2007
CYLINDER HEAD
2004 QX56
VALVE SEAT CONTACT

After confirming that the dimensions of valve guides and valves
are within specifications, perform this procedure.

Apply prussian blue (or white lead) onto contacting surface of
valve seat to check the condition of the valve contact on the sur-
face.

Check if the contact area band is continuous all around the cir-
cumference.

If not, grind to adjust valve fitting and check again. If the contact-
ing surface still has NG conditions even after the re-check,
replace valve seat.
VALVE SEAT REPLACEMENT
When valve seat is removed, replace with oversized (0.5 mm, 0.020 in) valve seat.
1. Bore out old seat until it collapses. Boring should not continue beyond the bottom face of the seat recess
in cylinder head. Set the machine depth stop to ensure this.
2. Ream cylinder head recess diameter for service valve seat.

Be sure to ream in circles concentric to the valve guide center.

This will enable valve seat to fit correctly.
3. Heat cylinder head to 110 to 130°C (230 to 266°F) by soaking in
heated oil.
4. Provide valve seats cooled well with dry ice. Force fit valve seat into cylinder head.
CAUTION:

Avoid directly touching cold valve seats.

Cylinder head contains heat. When working, wear protective equipment to avoid getting burned.
5. Finish seat to the specified dimensions using suitable tool. Refer
to EM-103, "
Valve Seat" .
CAUTION:
When using valve seat cutter, firmly grip the cutter handle
with both hands. Then, press on the contacting surface all
around the circumference to cut in a single drive. Improper
pressure on the cutter or cutting many different times may
result in stage valve seat.
SBIA0322E
Oversize [0.5 mm (0.020 in)] (Service):
Intake : 38.500 - 38.516 mm (1.5157 - 1.5164 in)
Exhaust : 32.700 - 32.716 mm (1.2874 - 1.2880 in)
SEM 79 5A
SEM 00 8A
SEM 93 4C

ENGINE ASSEMBLY
EM-71
C
D
E
F
G
H
I
J
K
L
MA
EM
Revision: August 20072004 QX56
5. Remove the cowl extension. Refer to EI-18, "Removal and Installation" .
6. Remove engine room cover using power tools.
7. Remove the air duct and air cleaner case assembly. Refer to EM-14, "
REMOVAL" .
8. Disconnect vacuum hose between vehicle and engine and set it aside.
9. Remove the radiator assembly and hoses. Refer to CO-10, "
REMOVAL" .
10. Remove the drive belts. Refer to EM-12, "
Removal" .
11. Remove the fan blade. Refer to CO-13, "
REMOVAL" .
12. Disconnect the engine room harness from the fuse box and set it aside for easier work.
13. Disconnect the ECM.
14. Disconnect the engine room harness from the engine side and set it aside for easier work.
15. Disconnect the engine harness grounds.
16. Disconnect the reservoir tank for power steering from engine and move it aside for easier work.
17. Disconnect power steering oil pump from engine. Move it from its location and secure with a rope for eas-
ier work. Refer to PS-26, "
REMOVAL" .
18. Remove the A/C compressor bolts and set aside. Refer to ATC-166, "
REMOVAL" .
19. Disconnect brake booster vacuum line.
20. Disconnect EVAP line.
21. Disconnect the fuel hose at the engine side connection. Refer to EM-29, "
REMOVAL" .
22. Disconnect the heater hoses at cowl, and install plugs to avoid leakage of engine coolant.
23. Remove the A/T oil level indicator and indicator tube upper bolts.
24. Remove the A/T. Refer to AT-255, "
Removal and Installation (4x2)" , or AT-258, "Removal and Installation
(4x4)" .
25. Install engine slingers into left bank cylinder head and right bank
cylinder head.
26. Lift with hoist and secure the engine in position.
27. Remove engine assembly from vehicle, avoiding interference
with vehicle body.
CAUTION:

Before and during this lifting, always check if any har-
nesses are left connected.
28. Remove alternator. Refer to SC-27, "
REMOVAL" .
29. Remove engine mounting insulator and bracket using power tool.
INSTALLATION
Installation is in the reverse order of removal.
CAUTION:

When replacing an engine or transmission you must make sure the dowels are installed correctly
during re-assembly.

Improper alignment caused by missing dowels may cause vibration, oil leaks or breakage of driv-
etrain components.
WBIA0464E
Engine slinger torque: 45.0 N·m (4.6 kg-m, 33 ft-lb)
PBIC1556E

EM-72Revision: August 2007
ENGINE ASSEMBLY
2004 QX56
INSPECTION AFTER INSTALLATION

Before starting engine, check the levels of engine coolant, engine oil and working fluid. If less than
required quantity, fill to the specified level.

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.

Run engine to check for unusual noise and vibration.

Warm up engine thoroughly to make sure there is no leakage of engine coolant, engine oil, working fluid,
fuel and exhaust gas.

Bleed air from passages in pipes and tubes of applicable lines, such as in cooling system.

After cooling down engine, again check amounts of engine coolant, engine oil and working fluid. Refill to
specified level, if necessary.

Summary of the inspection items:
*Transmission/transaxle/CVT fluid, power steering fluid, brake fluid, etc.Item Before starting engine Engine running After engine stopped
Engine coolant Level Leakage Level
Engine oil Level Leakage Level
Working fluid* Level Leakage Level
Fuel — Leakage —
Exhaust gas — Leakage —

CYLINDER BLOCK
EM-75
C
D
E
F
G
H
I
J
K
L
MA
EM
Revision: August 20072004 QX56
5. Drain engine coolant by removing cylinder block drain plug “A”,
“B”, “C” and “D” as shown.
6. Remove the following components and associated parts (The parts listed in step 3 are not included here.)

Oil pan and oil strainer. Refer to EM-22, "REMOVAL" .

Crankshaft pulley, front cover and timing chain. Refer to EM-36, "REMOVAL" .

Camshaft. Refer to EM-43, "REMOVAL" .

Cylinder head. Refer to EM-60, "REMOVAL" .
7. Remove knock sensor.
CAUTION:
Carefully handle the sensor, avoiding shocks.
8. Remove the piston and connecting rod assembly as follows.

Before removing the piston and connecting rod assembly, check the connecting rod side clearance.
Refer to EM-89, "
CONNECTING ROD SIDE CLEARANCE" .
a. Position the crankshaft pin corresponding to the connecting rod to be removed onto the bottom dead cen-
ter.
b. Remove the connecting rod cap.
c. Push the piston and connecting rod assembly out to the cylinder
head side using suitable tool.
9. Remove the connecting rod bearings.
CAUTION:
When removing them, note the installation position. Keep them in the correct order.
10. Remove the piston rings from the piston using suitable tool.
CAUTION:

When removing the piston rings, be careful not to dam-
age the piston.

Be careful not to damage piston rings by expanding them
excessively.

Before removing the piston rings, check the piston ring side
clearance. Refer to EM-90, "
PISTON RING SIDE CLEARANCE"
.
WBIA0419E
PBIC0086E
PBIC0087E

CYLINDER BLOCK
EM-79
C
D
E
F
G
H
I
J
K
L
MA
EM
Revision: August 20072004 QX56
Rotate crankshaft by hand after bolts are tightened. Check if it rotates smoothly.

Check the crankshaft side clearance. Refer to EM-89, "CRANKSHAFT END PLAY" .
8. Install rear oil seal to rear oil seal retainer.
CAUTION:
Do not damage or scratch outer circumference of oil seal.

Install new rear oil seal in the direction shown.

Tap until flattened with front edge of rear oil seal retainer
using suitable tool.

Fit the rear oil seal until it is level with the rear end surface of
rear oil seal retainer.
9. Install rear oil seal retainer.

Apply liquid gasket to rear oil seal retainer as shown.
Use Genuine RTV Silicone Sealant or equivalent. Refer to
GI-45, "
Recommended Chemical Products and Sealants".

Apply new engine oil on lips of rear oil seal. Do not touch.
10. Install the piston to the connecting rod.
a. Install the snap ring to the grooves of the piston rear side.

Insert it fully into groove to install.
b. Install the piston to the connecting rod.

Heat the piston until the piston pin can be pushed in by hand without excess force [approx. 60° to 70 C°
(140° to 158 °F)]. From the front to the rear, insert the piston pin into the piston and the connecting rod. Main bearing cap sub
bolts in order of 11 to 20: 30°
Side bolts in order of 21 to
30: 49 N·m (5.0 kg-m, 36 ft-lb)
SEM 71 5A
PBIC0097E
SBIA0391E

EM-80Revision: August 2007
CYLINDER BLOCK
2004 QX56

Assemble so that the front mark on the piston crown and the
oil holes and the cylinder No. on the connecting rod are posi-
tioned as shown.
c. Install the snap ring to the grooves of the piston front side.

Insert it fully into groove to install.

After installing, make sure the connecting rod moves
smoothly.
11. Install the piston rings.
CAUTION:
Be careful not to damage the piston.

Position each ring with the gap as shown, referring to the pis-
ton front mark.

Install the second ring with the stamped surface facing
upward.
12. Install the connecting rod bearings to the connecting rod and the
connecting rod cap.

When installing the connecting rod bearings, apply engine oil
to the bearing surface (inside). Do not apply oil to the back
surface, but thoroughly clean it.

When installing, align the connecting rod bearing stopper pro-
trusion with the cutout of the connecting rod to install.

Check the oil holes on the connecting rod and those on the
corresponding bearing are aligned.
13. Install the piston and connecting rod assembly to the crankshaft
using Tool.

Position the crankshaft pin corresponding to the connecting
rod to be installed onto the bottom dead center.

Apply engine oil sufficiently to the cylinder bore, piston, and
crankshaft pin.

Match the cylinder position with the cylinder No. on the con-
necting rod to install.

Install the piston with the front mark on the piston crown fac-
ing the front of the engine.
CAUTION:
Be careful not to damage the crankshaft pin, resulting from an interference of the connecting
rod big end.
KBIA2534E
Stamped mark Second ring : 2N
PBIC0100E
PBIC0266E
Tool number : EM03470000 (J-8037)
KBIA2535E

CYLINDER BLOCK
EM-81
C
D
E
F
G
H
I
J
K
L
MA
EM
Revision: August 20072004 QX56
14. Install the connecting rod cap.

Match the stamped cylinder number marks on the connecting
rod with those on the cylinder cap to install.
15. Tighten the connecting rod bolts using Tool.

Apply engine oil to the threads and seats of the connecting
rod bolts.

After tightening the bolts, make sure that the crankshaft
rotates smoothly.

Check the connecting rod side clearance. Refer to EM-89, "CONNECTING ROD SIDE CLEARANCE"
16. Install knock sensor.
CAUTION:
If the knock sensor is dropped, replace it with a new one.

Make sure that there is no foreign material on the cylinder
block mating surface and the back surface of the knock sen-
sor.

Install it with its connector facing the center of cylinder block
side.

Do not tighten the knock sensor bolts while holding the con-
nector.

Make sure that the knock sensor does not interfere with other
parts.

Position sub-harness as shown before installing intake mani-
fold.
17. Installation of the remaining components is in the reverse order of removal.
18. Remove engine assembly from engine stand.
KBIA2536E
Tool number : KV10112100 (BT-8653-A)
Connecting rod bolts
Step 1 : 19.6 N·m (1.5 kg-m, 11 ft-lb)
Step 2 : 90° clockwise
WBIA0586E
KBIA2493E
KBIA2549E

EM-90Revision: August 2007
CYLINDER BLOCK
2004 QX56
Piston and Piston Pin Clearance
(Piston pin clearance) = (Piston pin hole diameter) – (Piston pin
diameter)

If clearance exceeds specification, replace either or both of pis-
ton/piston pin assembly and connecting rod assembly with refer-
ence to specification of each part.

Refer to piston selection table to replace piston/piston pin
assembly. Refer to EM-83, "
HOW TO SELECT PISTON" .

Refer to connecting rod bearing selection table to replace con-
necting rod. Refer to EM-84, "
HOW TO SELECT CONNECTING
ROD BEARING" .
NOTE:
The connecting rod small end grade and piston pin hole (piston
pin) grade are provided only for the parts installed at the plant.
For service parts, no grades can be selected. (Only 0 grade is
available.)

Refer to EM-92, "Connecting Rod Bushing Oil Clearance (Small
End)" for the values for each grade at the plant.
PISTON RING SIDE CLEARANCE

Measure side clearance of piston ring and piston ring groove
using suitable tool.

If out of specification, replace piston and/or piston ring assembly.
PISTON RING END GAP

Check if diameter of cylinder bore is within specification.
Refer to EM-94, "
Piston to Cylinder Bore Clearance" .

Insert piston ring until middle of cylinder with piston, and mea-
sure gap.Standard : 0.002 - 0.006 mm (0.0001 - 0.0002 in)
KBIA2496E
KBIA2536E
Standard:
Top ring : 0.035 - 0.085 mm (0.0014 - 0.0033 in)
2nd ring : 0.030 - 0.070 mm (0.0012 - 0.0028 in)
Oil ring : 0.015 - 0.050 mm (0.0006 - 0.0020 in)
Limit:
Top ring : 0.11 mm (0.0043 in)
2nd ring : 0.10 mm (0.0039 in)
SEM 02 4AA
Standard:
Top ring : 0.23 - 0.33 mm (0.0091 - 0.0130 in)
2nd ring : 0.25 - 0.40 mm (0.0098 - 0.0157 in)
Oil ring : 0.20 - 0.60 mm (0.0079 - 0.0236 in)
Limit:
Top ring : 0.56 mm (0.0220 in)
2nd ring : 0.52 mm (0.0205 in)
Oil ring : 0.96 mm (0.0378 in)
PBIC0 118 E