Nissan Qashqai (2007-2010). Manual — part 60

EM-188

< ON-VEHICLE REPAIR >

[MR20DE]

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-238, "Cylinder Head"

.

CAUTION:

Never bore excessively to prevent cylinder head from scratching.

8.

When 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 hammer and valve guide drift (com-
mercial service tool).

CAUTION:

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

Assembly

1.

When valve guide is removed, install it.

CAUTION:

Replace with oversize [0.2 mm (0.008 in)] valve guide.

a.

Ream cylinder head valve guide hole with a valve guide reamer
(commercial service tool) (A).

b.

Heat cylinder head to 110 to 130

°

C (230 to 266

°

F) by soaking in

heated oil (A).

PBIC3214J

SEM931C

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

Refer to

EM-238, "Cylinder Head"

.

PBIC3215J

PBIC3214J

CYLINDER HEAD

EM-189

< ON-VEHICLE REPAIR >

[MR20DE]

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c.

Press valve guide (1) from camshaft side to dimensions as
shown in the figure.

CAUTION:

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

d.

Apply reamer finish to valve guide with a valve guide reamer
(commercial service tool) (A).

2.

When valve seat is removed, install it.

CAUTION:

Replace with oversize [0.5 mm (0.020 in)] valve seat.

a.

Ream cylinder head (1) recess diameter for service valve seat.

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

This will enable valve seat 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 cooled well with dry ice. Press-fit valve seat into cylinder head.

CAUTION:

• Never touch cold valve seats directly.
• Cylinder head contains heat, wear protective equipment to avoid getting burned.

2

: Cylinder head

Projection “H”

: Refer to

EM-238, "Cylinder Head"

.

PBIC3217J

Standard

: Refer to

EM-238, "Cylinder Head"

.

PBIC3215J

2

: Valve seat

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

Refer to

EM-238, "Cylinder Head"

.

PBIC3218J

PBIC3214J

EM-190

< ON-VEHICLE REPAIR >

[MR20DE]

CYLINDER HEAD

d.

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

EM-238, "Cylinder Head"

.

CAUTION:

When using valve seat cutter, firmly grip the 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 the 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

EM-191, "Inspection"

.

3.

Install valve oil seal.
• Install with a valve oil seal drift [SST:KV10115600] (A) to

match dimension in the figure.
NOTE:
Dimension “H” is height that measured before installing valve
spring (with valve spring seat).

4.

Install valve.
• Install larger diameter to intake side.

5.

Install valve spring (with valve spring seat).
• Install smaller pitch (valve spring seat side) to cylinder head

side (B).

• Confirm identification color (A) of valve spring.

6.

Install valve spring retainer.

7.

Install valve collet.
• Compress valve spring with a valve spring compressor, attach-

ment and adapter [SST: KV10116200] (A). Install valve collet
with a magnet hand.

CAUTION:

Be careful not to damage valve lifter holes.

• Tap valve stem edge lightly with a plastic hammer after instal-

lation to check its installed condition.

8.

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

SEM934C

Height “H”

: 15.1 - 15.7 mm (0.594 - 0.618 in)

PBIC3211J

1

: Valve spring seat (Do not remove from valve spring.)

Intake

: Green

Exhaust

: Purple

PBIC3462J

PBIC3209J

CYLINDER HEAD

EM-191

< ON-VEHICLE REPAIR >

[MR20DE]

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9.

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

Inspection

INFOID:0000000000893958

INSPECTION AFTER REMOVAL

Cylinder Head Bolts Outer Diameter

• Cylinder head bolts are tightened by plastic zone tightening

method. Whenever the size difference between “d1” and “d2”
exceeds the limit, replace them with a new one.

• If reduction of outer diameter appears in a position other than “d2”,

use it as “d2” point.

Cylinder Head Distortion

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

EM-241, "Cylinder

Block"

.

1.

Wipe off engine oil and remove water scale (like deposit), gasket, sealant, carbon, etc. with a scraper.

CAUTION:

Never allow gasket debris to enter passages for engine oil or water.

2.

At each of several locations on bottom surface of cylinder head,
measure the distortion in six directions using straightedge (A)
and feeler gauge (B).

• If it exceeds the limit, replace cylinder head.

INSPECTION AFTER DISASSEMBLY

VALVE DIMENSIONS

• Check the dimensions of each valve. For the dimensions, refer to

EM-238, "Cylinder Head"

.

• If dimensions are out of the standard, replace valve and check valve seat contact.

VALVE GUIDE CLEARANCE

Valve Stem Diameter

• Measure the diameter of valve stem with micrometer (A).

Valve Guide Inner Diameter

• Measure the inner diameter of valve guide with bore gauge.

Valve Guide Clearance

• (Valve guide clearance) = (Valve guide inner diameter) – (Valve

stem diameter)

Limit (“d1”–“d2”): 0.15 mm (0.0059 in)

PBIC3994E

Limit: Refer to

EM-238, "Cylinder Head"

.

PBIC3207J

Standard

: Refer to

EM-238, "Cylinder Head"

.

Standard

: Refer to

EM-238, "Cylinder Head"

.

Standard and Limit

: Refer to

EM-238, "Cylinder Head"

.

PBIC3213J