Infiniti QX56 (Z62). Manual - part 668

EM-112

< UNIT DISASSEMBLY AND ASSEMBLY >

CYLINDER BLOCK

Tighten main bearing cap bolts (M12) in order of No. 1 - 10
(clockwise).

CAUTION:

Use the angle wrench [SST: KV10112100 (BT8653-A)] (A) to
check tightening angle. Never make judgment by visual
inspection.

Tighten main bearing cap sub bolts (M9) in order of No. 11 - 20.
(clockwise)

Tighten side bolts (M10) in order of No. 21 - 30.

• After installing bolts, check that crankshaft can be rotated smoothly by hand.
• Check the crankshaft end play. Refer to

EM-137, "Cylinder Block"

Install rear oil seal retainer.
• Apply a continuous bead of liquid gasket with tube presser

(commercial service tool) to rear oil seal retainer as shown in
the figure.

Use Genuine RTV silicone sealant or equivalent. Refer to

Install rear oil seal on rear oil seal retainer.

• Apply new engine oil to both oil seal lip (A) and dust seal lip

(B).

• Install it so that each seal lip is oriented as shown in the figure.

CAUTION:

Be careful not to scratch or make burrs on circumference
of oil seal.

• Press in rear oil seal (1) to the position as shown in the figure.

• Using a suitable drift [outer diameter: 101 mm (3.98 in)].
• Check the garter spring is in position and seal lips are not

inverted.

10. Install piston to connecting rod as per the following:

Angle tightening: 40 degrees

Angle tightening: 30 degrees

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: 49.0 N·m (5.0 kg-m, 36 ft-lb)

: Protrusion

: 4.0 - 5.6 mm (0.157 - 0.220 in)

3.4 - 4.4 mm (0.134 - 0.173 in)

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: Engine inside

: Engine outside

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: Rear oil seal retainer rear end face

: 0 - 0.5 mm (0 - 0.020 in)

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CYLINDER BLOCK

EM-113

< UNIT DISASSEMBLY AND ASSEMBLY >

• Assemble so that the front mark (A) on the piston head and

the cylinder number (D) on connecting rod are positioned as
shown in the figure.

Using snap ring pliers, install new snap ring to the groove of pis-
ton rear side.
• Insert it fully into groove to install.

Install piston to connecting rod.
• Using an industrial use dryer or similar tool, heat piston until piston pin can be pushed in by hand without

excess force [approximately 60 to 70

C (140 to 158

F)]. From the front to the rear, insert piston pin into

piston and connecting rod.

Install new snap ring to the groove of the piston front side.
• Insert it fully into groove to install.
• After installing, check that connecting rod moves smoothly.

11. Using a piston ring expander (commercial service tool) (A),

install piston rings.

CAUTION:

• When installing piston rings, be careful not to damage

piston.

• Be careful not to damage piston rings by expending them

excessively.

• If there is stamped mark on ring, mount it with marked side up.

• Position each ring with the gap as shown in the figure referring

to the piston front mark (D).

• Check the piston ring side clearance. Refer to

EM-115, "Inspection"

12. Install connecting rod bearings to connecting rod and connecting rod bearing cap.

CAUTION:

Be careful not to drop connecting rod bearing, and to scratch the surface.

: Oil hole

: Front mark

: Engine front

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Stamped mark:

Top ring (A)

: 1 K

Second ring (B)

: 2 K

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: Top ring gap

: Oil ring upper or lower rail gap (either of them)

: Second ring and oil ring spacer gap

: 90 degrees

: 45 degrees

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EM-114

< UNIT DISASSEMBLY AND ASSEMBLY >

CYLINDER BLOCK

• Before installing connecting rod bearings, apply engine oil to the bearing surface (inside). Do not apply

engine oil to the back surface, but thoroughly clean it.

• When installing, align connecting rod bearing stopper protru-

sion (B) with cutout (A) of connecting rods and connecting rod
bearing caps to install.

• Ensure the oil hole (C) on connecting rod and that on the cor-

responding bearing are aligned.

13. Install piston and connecting rod assembly to crankshaft.

• Position crankshaft pin corresponding to connecting rod to be installed onto the bottom dead center.
• Apply engine oil sufficiently to the cylinder bore, piston and crankshaft pin journal.
• Match the cylinder position with the cylinder number on connecting rod to install.
• Be sure that front mark on piston crown is facing the front of the engine.
• Using a piston ring compressor [SST: EM03470000 (J-8037)]

(A) or suitable tool, install piston with the front mark on the pis-
ton crown facing the front of the engine.

CAUTION:

Be careful not to damage the cylinder wall and crankshaft
pin, resulting from an interference of the connecting rod big
end.

14. Install connecting rod bearing cap.

• Match the stamped cylinder number marks on connecting rod

with those on connecting rod bearing cap to install.

• Be sure that front mark (H) on connecting rod bearing cap is

facing the front of the engine.

15. Tighten connecting rod bolts as per the following:

Inspect the outer diameter of connecting rod bolt. Refer to

EM-115, "Inspection"

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

Tighten connecting rod bolts.

Completely loosen connecting rod bolts.

Tighten connecting rod bolts.

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PBIC3244J

: Sample codes

: Bearing stopper groove

: Small-end diameter grade

: Big-end diameter grade

: Weight grade

: Cylinder No.

: Management code

: 29.4 N·m (3.0 kg-m, 21.7 ft-lb)

: 0 N·m (0 kg-m, 0 ft-lb)

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CYLINDER BLOCK

EM-115

< UNIT DISASSEMBLY AND ASSEMBLY >

Tighten connecting rod bolts. (clockwise)

CAUTION:

Always use the angle wrench [SST: KV10112100 (BT8653-A)]. Never make judgment by visual
inspection.
• After tightening connecting rod bolts, check that crankshaft rotates smoothly.
• Check the connecting rod side clearance. Refer to

EM-115, "Inspection"

16. Install knock sensors (1).

• Install knock sensors in the direction shown in the figure.

• After installing knock sensor, connect harness connector, and

lay it out to front of the engine.

CAUTION:

• Never tighten mounting bolts while holding connector.
• If any impact by dropping is applied to knock sensor,

replace it with new one.

NOTE:
• Check that there is no foreign material on the cylinder block

mating surface and the back surface of knock sensor.

• Check that knock sensor does not interfere with other parts.

17. Install oil filter (for VVEL ladder assembly).

18. Install drive plate.

• Install drive plate (4) and reinforcement plate (3) as shown in

the figure.

• When installing drive plate to crankshaft (1), be sure to cor-

rectly align crankshaft side dowel pin and drive plate side
dowel pin hole.

CAUTION:

If these are not aligned correctly, engine runs roughly and
“MIL” illuminates.

• Holding ring gear with the ring gear stopper [SST: KV10119200 (J-49277)].
• Tighten the mounting bolts crosswise over several times.

19. Assemble in the reverse order of disassembly.

Inspection

INFOID:0000000006289584

CRANKSHAFT END PLAY

• Measure the clearance between thrust bearings and crankshaft

arm when crankshaft is moved fully forward or backward with a dial
indicator (A).

• If the measured value exceeds the limit, replace thrust bearings,

and measure again. If it still exceeds the limit, replace crankshaft
also.

: 19.6 N·m (2.0 kg-m, 14.5 ft-lb)

Angle tightening: 90 degrees

: Engine front

: Pilot converter

: Rounded

: Engine front

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Standard and limit

: Refer to

EM-137, "Cylinder Block"

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