Nissan X-Trail 32. Manual - part 1050

 

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Nissan X-Trail 32. Manual - part 1050

 

 

CYLINDER HEAD

EM-97

< UNIT DISASSEMBLY AND ASSEMBLY >

[MR20DD]

C

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c.

Press valve guide 

 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 

 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 

.

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.

: Cylinder head

Projection (H)

: Refer to 

EM-135, "Cylinder Head"

.

PBIC3217J

Standard

: Refer to 

EM-135, "Cylinder Head"

.

JPBIA0185ZZ

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

Refer to 

EM-135, "Cylinder Head"

.

PBIC3218J

PBIC3214J

EM-98

< UNIT DISASSEMBLY AND ASSEMBLY >

[MR20DD]

CYLINDER HEAD

d.

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

EM-135, "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-99, "Inspection"

.

3.

Install valve oil seal.
• Install with a valve oil seal drift [SST: KV10115600] 

 to match

dimension in the figure.
NOTE:
Dimension 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 .

• Confirm identification color 

 of valve spring.

6.

Install valve spring retainer.

7.

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

KV10116200] (A), the attachment [SST: KV10115900] (C), and
the adapter [SST: KV10109220] (B). Install valve collet with a
magnet hand.

CAUTION:

• Be careful not to damage valve lifter holes.

JSBIA2471ZZ

Height (H)

: 15.1 - 15.7 mm (0.594 - 0.618 in)

PBIC3211J

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

Intake

: White

Exhaust

: Orange

JPBIA4479ZZ

JPBIA0180ZZ

CYLINDER HEAD

EM-99

< UNIT DISASSEMBLY AND ASSEMBLY >

[MR20DD]

C

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• Fit the attachment [SST: KV10115900 (J-26336-20)] 

 in

thecenter of valve spring retainer 

 to press it.

• 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.

9.

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

Inspection

INFOID:0000000010783728

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-115, "Inspec-

tion"

.

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-135, "Cylinder Head"

.

• If dimensions are out of the standard, replace valve and check valve seat contact. Refer to "VALVE SEAT

CONTACT".

VALVE GUIDE CLEARANCE

JPBIA4477ZZ

Limit [(d1) – (d2)]: 0.15 mm (0.0059 in)

PBIC3994E

Limit: Refer to 

EM-135, "Cylinder Head"

.

JSBIA2474ZZ

EM-100

< UNIT DISASSEMBLY AND ASSEMBLY >

[MR20DD]

CYLINDER HEAD

Valve Stem Diameter

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

Valve Guide Inner Diameter

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

Valve Guide Clearance

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

stem diameter)

• If the calculated value exceeds the limit, replace valve and/or valve guide. When valve guide must be

replaced. Refer to 

EM-94, "Disassembly and Assembly"

.

VALVE SEAT CONTACT

• After confirming that the dimensions of valve guides and valves are within the specifications, perform this

procedure.

• Apply prussian blue (or white lead) onto contacting surface of valve seat to check the condition of the valve

contact on the surface.

• Check if the contact area band is continuous all around the circum-

ference.

• If not, grind to adjust valve fitting and check again. If the contacting

surface still has “NG” conditions 

 even after the recheck, replace

valve seat. Refer to 

EM-94, "Disassembly and Assembly"

.

VALVE SPRING SQUARENESS

• Set a try square (A) along the side of valve spring and rotate

spring. Measure the maximum clearance 

 between the top of

spring and try square.

• If it exceeds the limit, replace valve spring.

VALVE SPRING DIMENSIONS AND VALVE SPRING PRESSURE LOAD

• Check valve spring pressure with valve spring seat installed at the

specified spring height.

CAUTION:

Never remove valve spring seat from valve spring.

• If the installation load or load with valve open is out of the stan-

dard, replace valve spring (with valve spring seat).

Standard: Refer to 

EM-135, "Cylinder Head"

.

Standard: Refer to 

EM-135, "Cylinder Head"

.

Standard and Limit: Refer to 

EM-135, "Cylinder Head"

.

JSBIA2475ZZ

: OK

JPBIA0187ZZ

: Contact

C

:  V-block

Limit

: Refer to 

EM-135, "Cylinder Head"

.

JSBIA4163ZZ

Standard

: Refer to 

EM-135, "Cylinder Head"

.

SEM113

 

 

 

 

 

 

 

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