Infiniti G35 (V35) Sedan. Manual - part 627

CYLINDER HEAD

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• Before starting engine, check oil/fluid levels including engine coolant and engine oil. If less than required

quantity, fill to the specified level. Refer to 

MA-10, "Fluids and Lubricants"

.

• 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 leak-

age 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 fuel, exhaust gases, or any oil/fluids includ-

ing engine oil and engine coolant.

• Bleed air from lines and hoses of applicable lines, such as in cooling system.
• After cooling down engine, again check oil/fluid levels including engine oil and engine coolant. Refill to the

specified level, if necessary.

Summary of the inspection items:

*: Transmission/transaxle/CVT fluid, power steering fluid, brake fluid, etc.

Disassembly and Assembly

INFOID:0000000000956285

DISASSEMBLY

1.

Remove spark plug with spark plug wrench (commercial service tool).

2.

Remove valve lifter.
• Identify installation positions, and store them without mixing them up.

3.

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

KV10116200 (J-26336-)] (A), the attachment [SST:
KV10115900 (J26336-20)] (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.

4.

Remove valve spring retainer, valve spring and valve spring seat.

5.

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

6.

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

7.

Remove valve seat, if valve seat must be replaced.

Items

Before starting engine

Engine running

After engine stopped

Engine coolant

Level

Leakage

Level

Engine oil

Level

Leakage

Level

Other oils and fluid*

Level

Leakage

Level

Fuel

Leakage

Leakage

Leakage

Exhaust gases

—

Leakage

—

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CYLINDER HEAD

• 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-144, "Cylinder Head"

.

CAUTION:

Prevent to scratch cylinder head by excessive boring.

8.

Remove valve guide, if valve guide must be replaced.

a.

To remove valve guide, heat cylinder head to 110 to 130

°

C (230

to 266

°

F) by soaking in heated oil (A).

b.

Drive out valve guide 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.

9.

Remove spark plug tube, as necessary.
• Using a pliers, pull spark plug tube out of cylinder head. 

CAUTION:

• Take care not to damage cylinder head.
• Once removed, spark plug tube will be deformed and cannot be reused. Do not remove it unless

absolutely necessary.

ASSEMBLY

1.

If valve guide is removed in step 8 (DISASSEMBLY), install it. 
Replace with oversized [0.2 mm (0.008 in)] valve guide.

a.

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

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SEM931C

Valve guide hole diameter (for service parts):

Intake and exhaust

: Refer to 

EM-144, "Cylinder Head"

.

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CYLINDER HEAD

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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 from camshaft side to the dimensions as 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.

2.

If valve seat is removed in step 7 (DISASSEMBLY), install it. 
Replace with oversize [0.5 mm (0.020 in)] valve seat.

a.

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

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

This will enable valve to fit correctly.

b.

Heat cylinder head to 110 to 130

°

C (230 to 266

°

F) by soaking in

heated oil (A).

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Projection (A)

Intake and exhaust

: Refer to 

EM-144, "Cylinder Head"

.

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Standard

: Refer to 

EM-144, 

"Cylinder Head"

.

(Intake and exhaust)

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Oversize

: Refer to 

EM-144, 

"Cylinder Head"

.

(Intake and exhaust)

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CYLINDER HEAD

c.

Provide valve seats cooled well with dry ice. Force fit valve seat 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-144, "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 with cutter or cutting many different times may
result in stage valve seat. 

e.

Using compound, grind to adjust valve fitting. 

f.

Check again for normal contact. Refer to "VALVE SEAT CONTACT".

3.

Install new valve oil seals as follows:

a.

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

b.

Install with the valve oil seal drift [SST: KV10115600 (J-38958)]
(A) to match dimension in the figure.

4.

Install valve spring seat.

5.

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

6.

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

side (valve spring seat side).

7.

Install valve spring retainer.

SEM934C

Height (b) (Without valve spring seat installed)

Intake and exhaust

: 14.3 - 14.9 mm (0.563 - 0.587 in)

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A

: Wide pitch

: Cylinder head side

Paint mark color

: Yellowish green

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