2004 INFINITI QX56 check oil
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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 —
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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
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Revision: August 20072004 QX56Rotate 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
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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
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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
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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
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If out of specification, replace piston ring. If gap still exceeds the limit even with a new ring, re-bore cylin-
der and use oversized piston and piston ring.
CONNECTING ROD BEND AND TORSION
Check the connecting rod alignment using suitable tool.
If measurement exceeds the limit, replace connecting rod
assembly.
CONNECTING ROD BEARING (BIG END)
Install the connecting rod cap without the connecting rod bearing
installed. After tightening the connecting rod bolt to the specified
torque, measure the connecting rod large end inside diameter.
Refer to EM-77, "
ASSEMBLY" .
If measurement exceeds the standard, replace the connecting
rod.
CONNECTING ROD BUSHING OIL CLEARANCE (SMALL END)
Connecting Rod Inside Diameter (Small End)
Measure inside diameter of bushing using suitable tool.Limit:
Bend
: 0.15 mm (0.0059 in) per 100 mm (3.94 in) length
To r s i o n
: 0.30 mm (0.0118 in) per 100 mm (3.94 in) length
SEM 00 3F
SEM 03 8F
Standard : 57.000 - 57.013 mm (2.2441 - 2.2446 in)
PBIC1641E
Standard : 22.000 - 22.006 mm (0.8661 - 0.8664 in)
PBIC0120E
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Method of Using Plastigage
Remove oil and dust on the crankshaft journal and the surfaces
of each bearing completely.
Cut a plastigage slightly shorter than the bearing width, and
place it in crankshaft axial direction, avoiding oil holes.
Install the main bearings to the cylinder block and main bearing
cap, and tighten the main bearing bolts to the specified torque.
CAUTION:
Never rotate the crankshaft.
Remove the bearing cap and bearings, and using the scale on
the plastigage bag, measure the plastigage width.
NOTE:
The procedure when the measured value exceeds the repair limit is same as that described in “Method of
Measurement”.
CRUSH HEIGHT OF MAIN BEARING
When the bearing cap is removed after being tightened to the
specified torque with main bearings installed, the tip end of bear-
ing must protrude. Refer to EM-77, "
ASSEMBLY" for the tight-
ening procedure.
If the standard is not met, replace main bearings.
CRUSH HEIGHT OF CONNECTING ROD BEARING
When the connecting rod bearing cap is removed after being
tightened to the specified torque with connecting rod bearings
installed, the tip end of bearing must protrude. Refer to EM-77,
"ASSEMBLY" for the tightening procedure.
If the standard is not met, replace connecting rod bearings.
MAIN BEARING CAP BOLT DIAMETER
Check for bolts (M9 and M12) installed from lower side using the
following procedure.
NOTE:
Side bolt (M10) is outside the target.
Figure shows M12 bolt.
Measure bolt diameter "d1" from the tip of bolt to dimension "a".
Measure bolt diameter "d2" from the dimension between the tip
of bolt and dimension "b" as base station to dimension "c".
NOTE:
Measure "d2" at that point if narrower part in the threads is
determined by visual check.
Calculate the difference between "d1" and "d2".
KBIA2551E
Standard : There must be crush height
SEM 50 2G
Standard : There must be crush height.
PBIC1646E
KBIA2497E