Infiniti QX56 (JA60). Manual — part 484
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ENGINE UNIT
16. Install knock sensors.
CAUTION:
If 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 knock sensor.
• Install it with its connector facing the center of the cylinder
block side.
• Do not tighten knock sensor bolts while holding connector.
• Make sure knock sensor does not interfere with other parts.
• Position the sub-harness as shown before installing intake
manifold.
17. Installation of the remaining components is in the reverse order of removal.
18. Remove engine assembly from engine stand.
19. Install drive plate.
• Align dowel pin of crankshaft rear end with pin holes of each
part to install.
• Install drive plate, reinforcement plate and pilot converter (if
not installed in step 4) as shown.
• Face the chamfered or rounded edge side to the crankshaft.
Inspection After Disassembly
INFOID:0000000005149016
CRANKSHAFT END PLAY
KBIA2493E
KBIA2549E
KBIA2494E
KBIA2537E
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ENGINE UNIT
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• Move the crankshaft fully forward and backward and measure the
clearance between the thrust bearings and crankshaft arm using
suitable tool.
• If measured value exceeds the repair limit, replace the thrust bear-
ings, and measure again. If it still exceeds the repair limit, replace
crankshaft also.
CONNECTING ROD SIDE CLEARANCE
• Measure side clearance between the connecting rod and crank-
shaft arm using suitable tool.
• If measured value exceeds the repair limit, replace the connecting
rod bearings, and measure again. If it still exceeds the repair limit,
replace the crankshaft also.
PISTON AND PISTON PIN CLEARANCE
Piston Pin Hole Diameter
• Measure diameter of piston pin hole using suitable tool.
Piston Pin Diameter
• Measure diameter of piston pin using suitable tool.
Piston and Piston Pin Clearance
Standard
: 0.10 - 0.26 mm (0.0039 - 0.0102 in)
Limit
: 0.30 mm (0.0118 in)
PBIC0114E
Standard
: 0.20 - 0.40 mm (0.0079 - 0.0157 in)
Limit
: 0.40 mm (0.0157 in)
PBIC0115E
Standard
: 21.993 - 21.999 mm (0.8659 - 0.8661 in)
PBIC0116E
Standard
: 21.989 - 21.995 mm (0.8657 - 0.8659 in)
PBIC0117E
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EM-92
< DISASSEMBLY AND ASSEMBLY >
ENGINE UNIT
(Piston pin clearance) = (Piston pin hole diameter) – (Piston pin
diameter)
• If clearance exceeds specification, replace either or both the pis-
ton/piston pin assembly and the connecting rod assembly with ref-
erence to the specification of each part.
• Use the piston selection table to replace piston/piston pin assem-
bly. Refer to
EM-101, "How to Select Piston and Bearing"
• Use the connecting rod bearing selection table to replace connect-
ing rod. Refer to
EM-101, "How to Select Piston and 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 avail-
able).
• Follow "Connecting Rod Bushing Oil Clearance (Small End)" for
the values for each grade at the plant.
PISTON RING SIDE CLEARANCE
• Measure side clearance of the 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 the diameter of the cylinder bore is within specification.
• Insert the piston ring into the middle of the cylinder using the pis-
ton, and measure the gap.
• If out of specification, replace piston ring.
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 - 0.185 mm (0.0006 - 0.0073 in)
Limit:
Top ring
: 0.11 mm (0.0043 in)
2nd ring
: 0.10 mm (0.0039 in)
SEM024AA
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)
PBIC0118E
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CONNECTING ROD BEND AND TORSION
• Check connecting rod alignment using suitable tool.
• If measurement exceeds the limit, replace connecting rod assem-
bly.
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.
EM-83, "Disassembly and Assembly"
.
• If measurement exceeds the standard, replace connecting rod.
CONNECTING ROD BUSHING OIL CLEARANCE (SMALL END)
Connecting Rod Inside Diameter (Small End)
• Measure inside diameter of bushing using suitable tool.
Piston Pin Diameter
Limit:
Bend
: 0.15 mm (0.0059 in) per 100 mm (3.94 in) length
Torsion
: 0.30 mm (0.0118 in) per 100 mm (3.94 in) length
SEM003F
SEM038F
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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