Nissan X-Trail 32. Manual - part 1122

CYLINDER HEAD

EM-385

< UNIT DISASSEMBLY AND ASSEMBLY >

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c.

Turn all bolts 300 degrees clockwise (angle tightening).

CAUTION:

Check and confirm the tightening angle by using an angle
wrench [SST: KV10112100 ( — )] (A) or protractor. Never
judge by visual inspection without the tool.

3.

Assemble in the reverse order of disassembly, for the rest of parts. 

Disassembly and Assembly

INFOID:0000000010784362

DISASSEMBLY

1.

Set the cylinder head assembly to the cylinder head support [commercial service tool: KV113B0200
(Mot.1573)].

2.

Remove hydraulic tappet.

CAUTION:

Be sure to immerse the hydraulic tappets in a bath of engine oil to ensure no air enters.

3.

Remove valve collet 

. 

• Compress valve spring with valve spring compressor (com-

mercial service too) (A).

4.

Remove valve spring retainer and valve spring.

5.

Check dimension of valve oil seal mounting position before removing valve and valve oil seal with the fol-
lowing procedure: 

a.

Install the push rod (A) of valve seal drift [commercial service
tool: KV113B0180 (Mot.1511-01)] on the valve oil seal.
NOTE:
The inner diameter of the push rod must be identical to that of
the valve. In addition, the bottom of the push rod must come into
contact with the metal upper section of the valve oil seal.

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EM-386

< UNIT DISASSEMBLY AND ASSEMBLY >

[R9M]

CYLINDER HEAD

b.

Install the guide tube (B) over the push rod (A) until the guide
tube comes into contact with the cylinder head, locking the push
rod with the knurled wheel.
• Remove the guide tube assembly plus push rod, being careful

not to loosen the knurled wheel.

6.

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

7.

Remove valve oil seal 

 with a valve oil seal puller [commercial

service tool: KV113B0090 (Mot.1335)] (A).

ASSEMBLY

1.

Install valve.
NOTE:
Install larger diameter to intake side.

2.

Install valve oil seal with the following procedure:

a.

Position the protector (A) of valve seal drift [commercial service
tool: KV113B0180 (Mot.1511-01)] on the valve.

b.

Position a valve oil seal on the protector. Move the valve oil seal past the protector.

CAUTION:

Never lubricate valve oil seal.

c.

Remove the protector.

d.

Push in the push rod (A) of valve seal drift [commercial service
tool: KV113B0180 (Mot. 1511-01)] with palm of the hand until the
guide tube (B) makes contact with the cylinder head.

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CYLINDER HEAD

EM-387

< UNIT DISASSEMBLY AND ASSEMBLY >

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3.

Install valve spring.
NOTE:
The intake and exhaust valve springs are identical.

4.

Install valve spring retainer.

5.

Install valve collet 

.

• Compress valve spring with a valve spring compressor (com-

mercial service tool) (A).

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

lation to check its installed condition.

6.

Install hydraulic tappet.
• Check that the tappets are filled with oil before refitting them.

Inspection

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INSPECTION AFTER DISASSEMBLY

Cylinder Head Distortion

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

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 (

 - 

).

• If it exceeds the standard, replace cylinder head and cylinder

head housing.

NOTE:
Cylinder head cannot be replaced as a single part, because it is
machined together with cylinder head housing. Replace whole
cylinder head housing and cylinder head assembly.

VALVE DIMENSIONS

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

EM-415, "Cylinder Head"

.

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

VALVE GUIDE CLEARANCE

Valve Stem Diameter

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Standard: Refer to 

EM-415, "Cylinder Head"

.

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< UNIT DISASSEMBLY AND ASSEMBLY >

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CYLINDER HEAD

• 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)

• If it exceeds the standard, replace valve and/or cylinder head and cylinder head housing.

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 re-check, replace
cylinder head and cylinder head housing.

VALVE SPRING DIMENSIONS AND VALVE SPRING PRESSURE LOAD

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

specified spring height.

• If the pressure height is out of the standard, replace valve spring.

Standard

: Refer to 

EM-415, "Cylinder Head"

.

Standard

: Refer to 

EM-415, "Cylinder Head"

.

Standard : 

Refer 

to 

EM-415, "Cylinder Head"

.

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: OK

: NG

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Standard

: Refer to 

EM-415, "Cylinder Head"

.

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