Infiniti FX35, FX50 (S51). Manual - part 987

 

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Infiniti FX35, FX50 (S51). Manual - part 987

 

 

EM-248

< UNIT DISASSEMBLY AND ASSEMBLY >

[VK50VE]

CYLINDER HEAD

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.

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.

JPBIA0184ZZ

Projection (A)

: Refer to 

EM-285, "Cylinder Head"

.

JPBIA0186ZZ

Standard

: Refer to 

EM-285, "Cylinder Head"

.

JPBIA0185ZZ

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

: Refer to 

EM-285, "Cylinder Head"

.

JPBIA0188ZZ

CYLINDER HEAD

EM-249

< UNIT DISASSEMBLY AND ASSEMBLY >

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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-285, "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-251, "Inspection"

.

3.

Install new valve oil seals as per the following:

a.

Apply new engine oil on new valve oil seal joint and seal lip.

b.

Using the valve oil seal drift [SST: KV10115600 (J-38958)] (A),
press fit valve seal to height (b) shown in figure.

4.

Install valve.
NOTE:
Larger diameter valves are for intake side.

JPBIA0184ZZ

SEM934C

Height (b)

Intake

: 14.3 - 14.9 mm (0.563 - 0.587 in)

Exhaust

: 13.6 - 14.2 mm (0.535 - 0.559 in)

JPBIA1367ZZ

EM-250

< UNIT DISASSEMBLY AND ASSEMBLY >

[VK50VE]

CYLINDER HEAD

5.

Install oil filter (for VVEL ladder assembly) (1) in the direction
shown in the figure, if removed.
• Check that the oil filter does not protrude from the upper sur-

face of cylinder block (2) after installation.

6.

Install new cylinder head gaskets.

7.

Install cylinder head as per the following: 

CAUTION:

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

EM-

251, "Inspection"

.

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

EM-251, "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).

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.

g.

Tighten all cylinder head bolts again (clockwise).

JPBIA2129ZZ

A

:  Bank  2

B

:  Bank  1

: Engine front

: 40 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)

JPBIA2145ZZ

Angle tightening: 65 degrees

JPBIA0175ZZ

CYLINDER HEAD

EM-251

< UNIT DISASSEMBLY AND ASSEMBLY >

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8.

Install valve spring (with valve spring seat).
• Install narrow pitch (B) end [paint mark (C)] to cylinder head

side (valve spring seat side).

9.

Install valve spring retainer.

10. Install valve collet.

• Compress valve spring with the valve spring compressor [SST:

KV10116200 (J26336-A)] (A), the attachment [SST:
KV10115900 (J26336-20)] (C) and the adapter [SST:
KV10109220 (

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

hand.

CAUTION:

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

• Tap valve stem edge lightly with plastic hammer after installa-

tion to check its installed condition.

11. Install valve lifter.

• Install it in the original position.

12. Install in the reverse order of removal.

Inspection

INFOID:0000000005245258

INSPECTION AFTER DISASSEMBLY

Cylinder Head Bolts Outer Diameter

• Cylinder head bolts are tightened by plastic zone tightening

method. Whenever the size difference between (B) and (A)
exceeds the limit, replace them with new one. 

• If reduction of outer diameter appears in a position other than (A),

use it as (A) point.

Cylinder Head Distortion

NOTE:
When performing this inspection, cylinder block distortion should be also checked. Refer to 

EM-265, "Inspec-

tion"

.

1.

Using a scraper, wipe out oil, scale, gasket, sealant and carbon deposits from surface of cylinder head.

CAUTION:

Never allow gasket fragments to enter engine oil or engine coolant passages.

Angle tightening: 65 degrees

A

: Wide pitch

: Cylinder head side

Paint mark color

Intake

: Yellow

Exhaust

: Pink

JPBIA0179ZZ

JPBIA1365ZZ

Limit [(B) - (A)]

: 0.18 mm (0.0071 in)

c

: 55 mm (2.17 in)

d

: 12 mm (0.47 in)

JPBIA2144ZZ

 

 

 

 

 

 

 

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