Infiniti QX56 (Z62). Manual - part 662

EM-88

< REMOVAL AND INSTALLATION >

CYLINDER HEAD

2.

Install new cylinder head gaskets.

3.

Install cylinder head as per the following: 

CAUTION:

• If cylinder head bolts are re-used, check their outer diameters before installation. Refer to 

EM-92,

"Inspection"

.

• Before installing cylinder head, inspect cylinder head distortion. Refer to 

EM-92, "Inspection"

.

• Tighten cylinder head bolts in numerical order as shown in fig-

ure.

• Use TORX socket.

a.

Apply new engine oil to threads and seat surfaces of cylinder
head bolts.

b.

Tighten all cylinder head bolts.

c.

Tighten all cylinder head bolts (clockwise).

d.

Completely loosen all cylinder head bolts.

CAUTION:

In step “d”, loosen bolts in the reverse order of that indi-
cated in the figure.

e.

Tighten all cylinder head bolts.

f.

Tighten all cylinder head bolts (clockwise).

g.

Tighten all cylinder head bolts again (clockwise).

CAUTION:

Check the tightening angle using the angle wrench [SST:
KV10112100 (BT8653-A)] (A). Never make judgment by
visual inspection.
• Check tightening angle indicated on the angle wrench indica-

tor plate.

4.

Install valve lifter.
• Install it in the original position.

5.

Install in the reverse order of removal.

A

:  Bank  2

B

:  Bank  1

: Engine front

: 40.0 N·m (4.1 kg-m, 30 ft-lb)

Angle tightening: 75 degrees

: 0 N·m (0 kg-m, 0 ft-lb)

: 40.0 N·m (4.1 kg-m, 30 ft-lb)

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Angle tightening: 90 degrees

Angle tightening: 90 degrees

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CYLINDER HEAD

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< REMOVAL AND INSTALLATION >

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Disassembly and Assembly

INFOID:0000000006365632

DISASSEMBLY

1.

Remove valve collet.
• Compress valve spring with the valve spring compressor [SST:

KV10116200 (J-26336-A)] (A), the attachment [SST:
KV10115900 (J-26336-20)] (C) and the adapter [SST:
KV10109220 (

—

)] (B). Remove valve collet with a magnet

hand.

CAUTION:

When working, take care not to damage valve lifter holes.

2.

Remove valve spring retainer and valve spring (with valve spring seat).

3.

Push valve stem to combustion chamber side, and remove valve.
• Identify installation positions, and store them without mixing them up.

4.

Remove valve oil seal using the valve oil seal puller [SST:
KV10107902 (J38959)] (A).

5.

Remove valve seat (EXH), if valve seat (EXH) must be replaced.
• 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. Refer to 

EM-135, "Cylinder Head"

.

CAUTION:

Prevent to scratch cylinder head by excessive boring.

6.

Remove valve guide (EXH), if valve guide (EXH) must be replaced.

a.

To remove valve guide (EXH), heat cylinder head to 110 to
130

°

C (230 to 266

°

F) by soaking in heated oil (A).

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EM-90

< REMOVAL AND INSTALLATION >

CYLINDER HEAD

b.

Drive out valve guide (EXH) with a press [under a 20 kN (2 ton,
2.2 US ton, 2.0 lmp ton) pressure] or a hammer and the valve
guide drift (commercial service tool).

WARNING:

Cylinder head contains heat. When working, wear protec-
tive equipment to avoid getting burned.

ASSEMBLY

1.

Install valve guide (EXH), if removed. 
Replace with oversized [0.2 mm (0.008 in)] valve guide (EXH).

a.

Using the valve guide reamer (commercial service tool) (A),
ream cylinder head valve guide (EXH) hole.

b.

Heat cylinder head to 110 to 130

°

C (230 to 266

°

F) by soaking in

heated oil (A).

c.

Using the valve guide drift (commercial service tool), press valve
guide (EXH) from camshaft side to the dimensions as shown in
the figure.

WARNING:

Cylinder head contains heat. When working, wear protec-
tive equipment to avoid getting burned.

SEM931C

Oversize (service) [0.2 mm (0.008 in)]:

: Refer to 

EM-135, "Cylinder Head"

.

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Projection (A)

: Refer to 

EM-135, "Cylinder Head"

.

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CYLINDER HEAD

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d.

Using the valve guide reamer (commercial service tool) (A),
apply reamer finish to valve guide (EXH).

2.

Install valve seat (EXH), if removed. 
Replace with oversize [0.5 mm (0.020 in)] valve seat (EXH).

a.

Ream cylinder head recess diameter (a) for service valve seat
(EXH).

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

This enables valve to fit correctly.

b.

Heat cylinder head to 110 to 130

°

C (230 to 266

°

F) by soaking in

heated oil (A).

c.

Provide valve seats (EXH) cooled well with dry ice. Force fit valve seat (EXH) into cylinder head.

WARNING:

Cylinder head contains heat. When working, wear protective equipment to avoid getting burned.

CAUTION:

Avoid directly touching cold valve seats.

d.

Using the valve seat cutter set (commercial service tool) or valve
seat grinder, finish seat to the specified dimensions. Refer to

EM-135, "Cylinder Head"

.

CAUTION:

When using the valve seat cutter, firmly grip cutter handle
with both hands. Then, press on the contacting surface all
around the circumference to cut in a single drive. Improper
pressure on cutter or cutting many different times may
result in staged valve seat. 

e.

Using compound, grind to adjust valve fitting. 

f.

Check again for normal contact. Refer to 

EM-92, "Inspection"

.

3.

Install new valve oil seals as per the following:

Standard

: Refer to 

EM-135, "Cylinder Head"

.

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Oversize (service) [0.5 mm (0.020 in)]:

: Refer to 

EM-135, "Cylinder Head"

.

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